Wednesday
June 19, 2013

# Homework Help: Science: Physics

physics
A convex mirror with a radius of curvature of 34.0 cm forms a 0.95 cm tall image of a pencil at a distance of 12.5 cm behind the mirror. Calculate the object distance for the pencil and its height. Is the image real or virtual? What is the magnification?
Tuesday, March 12, 2013 at 11:03pm

Physics
Every once in a while a bird will get hit by a baseball during a baseball game. The longest home runs in baseball land about 500 feet (which is 152.4 meters) from home plate. If these balls leave the bat at a 45 degree angle to maximize their distance, what is the minimum safe...
Tuesday, March 12, 2013 at 10:18pm

Physics
An aluminum ring of radius 5.00 cm and resistance 2.00 10-4 Ω is placed around the top of a long air-core solenoid with 997 turns per meter and a smaller radius of 3.00 cm, as in the figure below. If the current in the solenoid is increasing at a constant rate of 267 A/s...
Tuesday, March 12, 2013 at 10:17pm

Physics
You are holding onto a 100 kg basket of fish hanging over the side of a boat. What is the minimum force in Newtons you need to exert to keep the basket from falling back down into the ocean?
Tuesday, March 12, 2013 at 10:16pm

physics
A charged particle with a charge-to-mass ratio of |q|/m = 5.7 × 108 C/kg travels on a circular path that is perpendicular to a magnetic field whose magnitude is 0.86 T. How much time does it take for the particle to complete one revolution?
Tuesday, March 12, 2013 at 10:12pm

Physics
You launch a model rocket up into the sky. Right after launch the rocket is accelerating upwards at 10~m/s^2. What is the magnitude of the net force in Newtons on the rocket if the rocket has a mass of 0.1 kg?
Tuesday, March 12, 2013 at 10:12pm

Physics
A man is standing on a cliff and throws a ball outward 50m/s at an angle of 53 degrees. It hits the base of the cliff in 10 seconds. Find: a) The height of the cliff b) the angle at which the ball goes into the sea c) if the ball will hit a boat 150m out to sea.
Tuesday, March 12, 2013 at 10:09pm

Physics
A ball is dropped from a height of 20m. When it bounces, it rebounds with a speed that is one half of the speed at which it hits the ground. How high does it bounce?
Tuesday, March 12, 2013 at 10:08pm

Physics
A ball is dropped from a height of 20m. When it bounces, it rebounds with a speed that is one half of the speed at which it hits the ground. How high does it bounce?
Tuesday, March 12, 2013 at 10:03pm

Physics
a book is 240 mm in width. What is this width in centimeters? in meters?
Tuesday, March 12, 2013 at 9:11pm

Physics
A force is applied to a door at an angle of 56.8° and 0.34 m from the hinge. a) What force produces a torque with a magnitude of 2.18 N·m? b) How large is the maximum torque this force can exert?
Tuesday, March 12, 2013 at 8:34pm

Physics
A ball on the end of a string is whirled around in a horizontal circle of radius 0.33 m. The plane of the circle is 1.21 m above the ground. The string breaks and the ball lands 2.22 m away from the point on the ground directly beneath the ball’s location when the string ...
Tuesday, March 12, 2013 at 8:19pm

physics
wonder waves in shallow yellow dA.isc are 6.0 cm long. at one point, the water oscillates up and down at a rate of 4.8 of oscillations per second. A. what is the speed of the water waves? B. what is the period Of water waves?
Tuesday, March 12, 2013 at 7:44pm

physics
wonder waves in shallow yellow disc are 6.0 cm long. at one point, the water oscillates up and down at a rate of 4.8 of oscillations per second
Tuesday, March 12, 2013 at 7:44pm

Physics
during the 4.0 min a 5.0a current is set up in a wire, how many (a) coulombs and (b) electrons pass through any given point in the wire?
Tuesday, March 12, 2013 at 6:44pm

physics
I'm a hurry to go to work today because I forgot to set my alarm clock and woke up late. I'm driving my car very fast, with a velocity of v=40 m/s and coming up to an intersection with a stoplight. When the distance between my car and the intersection is L=100 m, the ...
Tuesday, March 12, 2013 at 6:43pm

Note for Ms. Sue
Check out the Physics posting on the top of the list. Can it be deleted?
Tuesday, March 12, 2013 at 6:30pm

physics
You launch a model rocket up into the sky. Right after launch the rocket is accelerating upwards at 10 m/s^2. What is the magnitude of the net force in Newtons on the rocket if the rocket has a mass of 0.1 kg?
Tuesday, March 12, 2013 at 5:14pm

Quantum Physics
Alice and Bob share a state a| + +> + b |- -> , where the first qubit is Alice's and the second qubit is Bob's. Alice measures her qubit in the standard basis and sends the measurement outcome to Bob. If Bob wants his qubit to end up in the state a |0> + b |1&...
Tuesday, March 12, 2013 at 4:27pm

Quantum Physics
Alice and Bob share a state a| + +> + b |- -> , where the first qubit is Alice's and the second qubit is Bob's. Alice measures her qubit in the standard basis and sends the measurement outcome to Bob. If Bob wants his qubit to end up in the state a |0> + b |1&...
Tuesday, March 12, 2013 at 4:23pm

Quantum Physics
Alice and Bob share a state a| + +> + b |- -> , where the first qubit is Alice's and the second qubit is Bob's. Alice measures her qubit in the standard basis and sends the measurement outcome to Bob. If Bob wants his qubit to end up in the state a |0> + b |1&...
Tuesday, March 12, 2013 at 4:23pm

Physics
Which of the following parallel-plate capacitors hold the largest charge? A) A capacitor with area A and separation 2d connected to voltage 4V B) A capacitor with area 2A and separation d connected to voltage 2V C) A capacitor with area 2A and separation 2d connected to ...
Tuesday, March 12, 2013 at 4:21pm

Quantum Physics
1.Provide a unitary that maps |+> to |1>and |-> to |0> . Enter 0 in all boxes if no such unitary exists. (In this case, you have to enter 0 explicitly. Blanks are not accepted.) 2.Provide a unitary that maps |+> to|0> and |-> to |+> . Enter 0 in all ...
Tuesday, March 12, 2013 at 4:17pm

Physics
Electrons are accelerated to reach a kinetic energy of 250 eV (= 4.0 x 10-17 J). If the acceleration is done in a distance of 0.20 m, what is the magnitude of the electric field causing the acceleration?
Tuesday, March 12, 2013 at 3:47pm

Physics
A transport plane takes off from a level landing field with two gliders in tow, one behind the other. The mass of each glider is 700 {kg}, and the total resistance (air drag plus friction with the runway) on each may be assumed constant and equal to 2100N . The tension in the ...
Tuesday, March 12, 2013 at 2:44pm

physics
if a studebt standing on the scale and the scale reads zero should the student worry...when on an elevator
Tuesday, March 12, 2013 at 2:27pm

physics
A telescope has an objective with a refractive power of 1.20 diopters and an eyepiece with a refractive power of 220 diopters. What is the angular magnification of the telescope?
Tuesday, March 12, 2013 at 2:20pm

1) A box with a mass of 17 kg is moving at a velocity of 3.75 m/s. If the box was pushed with a force of 75 N how far did it go? 2) Calculate the momentum for a 0.18 kg rifle bullet traveling 369 m/s. 3) What is the impulse needed to stop the bullet? 4)Ice has a specific heat ...
Tuesday, March 12, 2013 at 1:29pm

physics
a body cools from 80 degrees to 50 degrees in 5 minuts. calculate what time it will take to cool from 60 degrees to 30 degrees?
Tuesday, March 12, 2013 at 1:19pm

physics
A string under a tension of 43.0 N is used to whirl a rock in a horizontal circle of radius 2.45 m at a speed of 20.9 m/s on a frictionless surface as shown in the figure below. As the string is pulled in, the speed of the rock increases. When the string is 1.00 m long and the...
Tuesday, March 12, 2013 at 1:16pm

physics
Harper applies a force of 92 N on a heavy box by using a rope held at an angle of 45 degrees with the horizontal. What are the vertical and horizontal components of the 92N force?
Tuesday, March 12, 2013 at 12:07pm

physics
A 6 N force acts on a current carrying wire of length 0.5 m that is placed in a 1.5 T external magnetic field. What is the current in the wire?
Tuesday, March 12, 2013 at 11:56am

physics
a kids marble rolls of a 63 cm tall table a a speed of 30 cm/s. How far from the based of the table will the ball land?
Tuesday, March 12, 2013 at 11:46am

physics
Amplitude of the wave is 0.2m. The time period of the vibration is 0.5secs. Calculate the frequency, velocity and the wave length.
Tuesday, March 12, 2013 at 11:22am

Physics
A particle P of mass 2kg is attached to one end of a light rod of length 0.5m which is free to rotate in a vertical plane about its other end.The particle describes complete circles, Given that the tension at the bottom is 5times the tension at the highest point, find spped of...
Tuesday, March 12, 2013 at 10:02am

Physics...PLZ!! =)
A conducting rod whose length is 25 cm is placed on a U-shaped metal wire that has a resistance R of 8 Ù. The wire and the rod are in the plane of the paper. A constant magnetic field of strength 0.4 T is applied perpendicular and into the paper. An applied force moves ...
Tuesday, March 12, 2013 at 9:19am

Physics
A 200-loop coil of cross sectional area 8.5 lies in the plane of the paper. Directed out of the plane of the paper is a magnetic field of 0.06 T. The field out of the paper decreases to 0.02 T in 12 milliseconds. (a) What is the magnitude of the change in magnetic flux ...
Tuesday, March 12, 2013 at 9:18am

Physics
A 50-cm wire placed in an East-West direction is moved horizontally to the North with a speed of 2 m/s. The Horizontal and Vertical components of the earth's magnetic field at that location are 25 ìT and 50ìT respectively. What is the emf between the ends of ...
Tuesday, March 12, 2013 at 9:11am

Physics
A sailor strikes the side of his ship just below the surface of the sea. He hears the echo of the wave reflected from the ocean floor directly below 3.88 s later. If the speed of sound in seawater is 1560 m/s, How deep is the ocean at this point?
Tuesday, March 12, 2013 at 8:23am

Physics
A cord of mass 0.58 kg is stretched between two supports 28.1 m apart. If the tension in the cord is 273 N, how long will it take a pulse to travel from one support to the other?
Tuesday, March 12, 2013 at 8:23am

Physics
A sound wave in air has a frequency of 240 Hz and travels with a speed of 334.7 m/s. How far apart are the wave crests (compressions)?
Tuesday, March 12, 2013 at 8:22am

physics
a force of magnutide 2N acted on the surface of a table of area 2M2 .find the pressure onthe table?
Tuesday, March 12, 2013 at 6:02am

Physics
When a man in a cage whose weight is 1000N pulls a rope that is attached on a cage around a fixed pulley,the force he exerts on the floor of the cage is 450N ,if the cage weigh 250N ,find the acceleration
Tuesday, March 12, 2013 at 5:19am

simple physics.....
You are holding onto a 100 kg basket of fish hanging over the side of a boat. What is the minimum force in Newtons you need to exert to keep the basket from falling back down into the ocean?
Tuesday, March 12, 2013 at 1:58am

Physics
A block of mass m1 = 22.0 kg is connected to a block of mass m2 = 40.0 kg by a massless string that passes over a light, frictionless pulley. The 40.0-kg block is connected to a spring that has negligible mass and a force constant of k = 260 N/m as shown in the figure below. ...
Tuesday, March 12, 2013 at 1:53am

Physics
Ten meters away from a long straight wire, the field is 10-4 (10 to the negative four) Tesla. What current flows through the wire? I know the answer is 5.0kA but I am not sure what formula to use.
Tuesday, March 12, 2013 at 1:01am

physics
a 20N force is required to stretch a spring by 0.5 m. a) what is the spring constant? b)how much energy is stored in the spring ?
Tuesday, March 12, 2013 at 12:11am

physics
a 20N force is required to stretch a spring by 0.5 m. a) what is the spring constant? b)how much energy is stored in the spring ?
Tuesday, March 12, 2013 at 12:11am

Physics
A bead slides without friction around a loop–the–loop (see figure below). The bead is released from rest at a height h = 3.60R. (a) What is its speed at point ? (Use the following as necessary: the acceleration due to gravity g, and R.) v = So I can't get this. I...
Monday, March 11, 2013 at 11:36pm

Physics
A bead slides without friction around a loop–the–loop (see figure below). The bead is released from rest at a height h = 3.60R. (a) What is its speed at point ? (Use the following as necessary: the acceleration due to gravity g, and R.) v = So I can't get this. I...
Monday, March 11, 2013 at 11:30pm

Quantum Physics
Suppose we are given a single qubit which is either in the state |u> = cos(pi/8) |0> + sin(pi/8) |1> or |v> = cos(3pi/8) |0> + sin(3pi/8) |1>. We measure this qubit in the standard basis and guess u if the outcome is 0 and guess v if the outcome is 1. (a) ...
Monday, March 11, 2013 at 11:15pm

Quantum Physics
I) Provide a unitary that maps |+> to |1> and |-> to |0> . Enter 0 in all boxes if no such unitary exists. a b c d II)Provide a unitary that maps |+> to |0> and |-> to |+> . Enter 0 in all boxes if no such unitary exists. a b c d III)Provide a unitary ...
Monday, March 11, 2013 at 11:06pm

Quantum Physics
Let |ψ> = a|0>+b|1> where a and b are nonnegative real numbers. We know that if we apply H to this qubit and then measure the resulting state in the sign basis, the probability of getting a + is 1/4 (a) What is |ψ> in the standard basis? |0> = |1>...
Monday, March 11, 2013 at 10:48pm

physics
A wire that is 46 cm long is parallel to a 0.54 T uniform magnetic field. The current through the wire is 4.5 A. What force acts on the wire?
Monday, March 11, 2013 at 8:59pm

physics
if Royce was 10 years old and he had a mass of 30kg. but by the time he turned 16 his mass has grown to 60kg. how much larger is the gravitational force between Royce and earth at age 16 compared to age 10
Monday, March 11, 2013 at 8:52pm

physics
What would the gravitational potential energy be if the bucket were raised six times as high?
Monday, March 11, 2013 at 8:28pm

physics
If you do 110 J of work to elevate a bucket of water, how much energy did you add to the gravitational field?
Monday, March 11, 2013 at 8:27pm

physics
A boulder is raised above the ground so that the gravitational potential energy relative to the ground is 360 J. Then it is dropped. What is its kinetic energy just before it hits the ground?
Monday, March 11, 2013 at 8:09pm

physics
Calculate the work done when a 18 N force pushes a cart 2.5 m.
Monday, March 11, 2013 at 8:05pm

physics
James Bond is trying to jump from a bridge and land on the first car of a moving train that is going to pass under the bridge. The train moves at 85 km/h and the vertical height between the bridge and the top of the carriage is 15 m. if Bond gets a running start of 4.2 m/s ...
Monday, March 11, 2013 at 7:27pm

Physics
You are standing on top of a building that is 75-m high and you throw a 3-kg stone horizontally at a speed of 5.4-m/s. How far from the base of the building will the stone land? (the ground is flat)
Monday, March 11, 2013 at 7:13pm

1) A 20 kg rock is on the edge of a 100 m cliff. a. What potential energy does the rock possess relative to the base of the cliff? b. The rock falls from the cliff. What is the kinetic energy just before it strikes the ground? c. What speed does the rock have as it strikes the...
Monday, March 11, 2013 at 5:13pm

Physics
A sound of constant frequency is produced by the si-ren on top of a firehouse. Compared to the frequen-cy produced by the siren, what is the frequency heard by a firefighter approaching the firehouse? What if the firefighter is driving away?
Monday, March 11, 2013 at 4:46pm

Physics
James Bond is trying to jump from a bridge and land on the first car of a moving train that is going to pass under the bridge. The train moves at 85 km/h and the vertical height between the bridge and the top of the carriage is 15 m. if Bond gets a running start of 4.2 m/s ...
Monday, March 11, 2013 at 4:19pm

Physics
Two particles each have a mass of 5.5 10-3 kg. One has a charge of +4.8 10-6 C, and the other has a charge of -4.8 10-6 C. They are initially held at rest at a distance of 0.88 m apart. Both are then released and accelerate toward each other. How fast is each particle moving ...
Monday, March 11, 2013 at 3:18pm

Physics
Two particles each have a mass of 5.5 10-3 kg. One has a charge of +4.8 10-6 C, and the other has a charge of -4.8 10-6 C. They are initially held at rest at a distance of 0.88 m apart. Both are then released and accelerate toward each other. How fast is each particle moving ...
Monday, March 11, 2013 at 3:18pm

physics
water is pumped steadily out of a flooded basement at a speed of 4.5 m/s through a uniform house of radius 1.0 cm.the hose passes out through a window 3.5 m above the waterline.what is the power of the pump
Monday, March 11, 2013 at 1:50pm

Physics
A microscope is focused on a mark a table, when the mark is covered by a glass 3.00cm thick. Tthe microscope has to be raised 1.1cm for the mark to be once more in focus. Calculate the refractive index of the glass.
Monday, March 11, 2013 at 12:48pm

physics
A student throws two beanbags in the air, one straight up and the other one at a 30° angle from the vertical. Both beanbags are thrown with the same initial velocity and from the same height. In your own words, explain which one will come back and hit the ground first and ...
Monday, March 11, 2013 at 12:37pm

physics
a car traveling 41.6 m/s is 190 m behind a truck traveling 19.4 m/s. how long will it take the car to reach the truck?
Monday, March 11, 2013 at 11:50am

physics
at highway speeds, a particular automobile is capable of an acceleration of about 2.6 m/s^2. at this rate, how long does it take to accelerate from 60 km/h to 110 km/h?
Monday, March 11, 2013 at 11:22am

physics
We know how to calculate the total resistance of the cylindrical conductor given its length, radius, and resistivity. But how do we calculate the equivalent resistance when the resistivity is not constant? For example, say the resistivity at a particular point at a distance x ...
Monday, March 11, 2013 at 10:56am

physics
A Chinook salmon has a maximum underwater speed of 3.0 m/s, and can jump out of the water vertically with a speed of 4.8 m/s. A record salmon has a length of 1.5 m and a mass of 62 kg. When swimming upward at constant speed, and neglecting buoyancy, the fish experiences three ...
Monday, March 11, 2013 at 10:52am

Physics
how far from the center of the earth would a person with a weight of 469N on earth have to be to have a weight off 55.4N?
Monday, March 11, 2013 at 9:45am

physics
determine the magnitude of the centripetal force that acted on the whirling ball??
Monday, March 11, 2013 at 12:33am

physics
A sinusoidal voltage Δv = (65 V) sin (140t) is applied to a series RLC circuit with L = 100 mH, C = 175 μF, and R = 42 Ω. (a) What is the impedance of the circuit?
Monday, March 11, 2013 at 12:02am

physics
A rubber band has a"spring constant" of 45 N/m. When the rubber band is pulled by a force of 9.8 N , how far will it stretch and what is potential energy?
Sunday, March 10, 2013 at 11:21pm

physics
how a bleeder resistor (R = 260 k) is used to discharge a capacitor (C = 85.0 µF) after an electronic device is shut off, allowing a person to work on the electronics with less risk of shock. Figure 20.47 (a) What is the time constant? (b) How long will it take to ...
Sunday, March 10, 2013 at 10:53pm

physics
How far from the center of the Earth must a 90 kg astronaut be in order for them to weigh 90 N? The mass of the Earth is 6 x 1024 kg.
Sunday, March 10, 2013 at 10:26pm

physics
How far from the center of the Earth must a 90 kg astronaut be in order for them to weigh 90 N? The mass of the Earth is 6 x 1024 kg.
Sunday, March 10, 2013 at 10:26pm

Physics
A 250N force is applied at an angle of 32 degrees above the horizontal to a 96kg box causing it to slide along a floor. The coefficient of friction between the box and the floor is 0.18. What is the magnitude of the net force on the box? The answer is 67N, I'm just not ...
Sunday, March 10, 2013 at 10:06pm

Physics
A box is held against a wall (not resting on the ground). What minimum horizontal force will JUST prevent the 5.0kg box from sliding if the coefficient of friction betweent he wall and the box is 0.65?
Sunday, March 10, 2013 at 9:55pm

physics
A gold prospector finds a solid rock that is composed solely of quartz and gold. The mass and volume of the rock are, respectively, 13.3 kg and 3.56 × 10-3 m3. The density of gold is 19 300 kg/m3, and the density of quartz is 2660 kg/m3. Find the mass of the gold in the ...
Sunday, March 10, 2013 at 9:08pm

physics
The concepts that play roles in this problem are similar to those in Multiple-Concept Example 15, except the fluid here moves upward rather than remaining horizontal. A liquid is flowing through a horizontal pipe whose radius is 0.0215 m. The pipe bends straight upward through...
Sunday, March 10, 2013 at 9:08pm

physics
A lost shipping container is found resting on the ocean floor and completely submerged. The container is 5.7 m long, 2.7 m wide, and 2.3 m high. Salvage experts attach a spherical balloon to the top of the container and inflate it with air pumped down from the surface. When ...
Sunday, March 10, 2013 at 9:07pm

physics
Two circular holes, one larger than the other, are cut in the side of a large water tank whose top is open to the atmosphere. Hole 1 is the larger hole, and hole 2 is the smaller hole. The center of one of these holes is located 6 times as far beneath the surface of the water ...
Sunday, March 10, 2013 at 9:06pm

physics
Shyanne (60 kg) has to walk across a single rope bridge to cross a river. When she's at the exact middle point, the rope bridge is deflected at an angle of 15 degrees from the horizontal. What is the tension in the bridge?
Sunday, March 10, 2013 at 8:55pm

Physics
Your grandfather clock’s pendulum has a length of 0.9930 m. If the clock loses 95.6 seconds per day, by how many millimeters should you adjust the length of the pendulum?
Sunday, March 10, 2013 at 8:45pm

physics
You launch a model rocket up into the sky. Right after launch the rocket is accelerating upwards at 10 m/s2. What is the magnitude of the net force in Newtons on the rocket if the rocket has a mass of 0.1 kg?
Sunday, March 10, 2013 at 8:45pm

Physics
What is the period of a simple pendulum 83 cm long on the Earth?
Sunday, March 10, 2013 at 8:45pm

Physics
A pendulum has a period of 4.28 s on Earth. What is its period on Mars, where the acceleration of gravity is about 0.37 that on Earth?
Sunday, March 10, 2013 at 8:45pm

Physics
A 3.23 kg ball is attached to a ceiling by a 1.31 m long string. The height of the room is 5.75 m What is the gravitational potential energy of the ball relative to a point at the same elevation as the ball?
Sunday, March 10, 2013 at 7:48pm

Physics
A 51.8 kg pole vaulter running at 11.5 m/s vaults over the bar. Her speed when she is over the bar is 1.26 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar
Sunday, March 10, 2013 at 7:32pm

PHYSICS
At what angle should you launch a projectile from the ground so that it has the greatest time of flight?
Sunday, March 10, 2013 at 7:24pm

Physics
Buffy the Vampire Slayer is buffing up her 0.53 meter long arms by bench pressing. In 35 seconds she can lift 38 kilograms of mass 23 times. How powerful are Buffy's arms?
Sunday, March 10, 2013 at 6:54pm

physics
At what height above Earth's surface is the gravitational acceleration reduced from its sea-level value by 0.60%?
Sunday, March 10, 2013 at 6:30pm

Physics
How much work can a 252 W motor accomplish in 13 seconds?
Sunday, March 10, 2013 at 6:29pm

Physics
Suppose you wish to make a solenoid whose self-inductance is 1.6 mH. The inductor is to have a cross-sectional area of 1.3 x 10-3 m2 and a length of 0.065 m. How many turns of wire are needed?
Sunday, March 10, 2013 at 6:12pm

Physics
Buffy the Vampire Slayer is buffing up her 0.53 meter long arms by bench pressing. In 35 seconds she can lift 38 kilograms of mass 23 times. How powerful are Buffy's arms?
Sunday, March 10, 2013 at 5:41pm

Physics
A girl(60 kg) is sliding in the snow towards a cliff that is only 15 meters away. She is moving 6 m/s. She digs her fingers into the snow to try and save herself. How much force do her fingers need to provide if she is going to successfully stop in time?
Sunday, March 10, 2013 at 4:35pm

1) A racing car has a mass of 1525 kg. What is its kinetic energy if it has a speed of 35 m/s? 2) How much potential energy does Tim,with mass 60.0 kg, gain when he climbs a gymnasium rope a distance of 3.5 m? -Benchmark Review-
Sunday, March 10, 2013 at 4:29pm

Physics
A plate carries a charge of -3.2 µC, while a rod carries a charge of +1.5 µC. How many electrons must be transferred from the plate to the rod, so that both objects have the same charge?
Sunday, March 10, 2013 at 4:16pm

Physics
A car is driven east for a distance of 46 km, then north for 29 km, and then in a direction 29° east of north for 22 km. Determine (a) the magnitude (in km) of the car's total displacement from its starting point and (b) the angle (from east) of the car's total ...
Sunday, March 10, 2013 at 4:03pm

physics
The position vector r of a particle moving in the xy plane is r=2ti+2sin[(pi/4)t]j , with is in meters and t in seconds. (a) Calculate the x and y components of the particle's position at , and 4.0 s and sketch the particle's path in the plane for the interval . (b) ...
Sunday, March 10, 2013 at 3:34pm

Physics
You launch a model rocket up into the sky. Right after launch the rocket is accelerating upwards at 10~m/s^2. What is the magnitude of the net force in Newtons on the rocket if the rocket has a mass of 0.1 kg?
Sunday, March 10, 2013 at 3:29pm

physics
A white billiard ball with mass mw = 1.32 kg is moving directly to the right with a speed of v = 2.91 m/s and collides elastically with a black billiard ball with the same mass mb = 1.32 kg that is initially at rest. The two collide elastically and the white ball ends up ...
Sunday, March 10, 2013 at 3:17pm

physics
The unitary rotation corresponding to this gate looks as follows: (assuming the first qubit is the control qubit)⎛⎝⎜⎜⎜​;⎜⎜⎜⎜⎜[​16;⎜⎜10000100001000010000000​0000000000000000000000000A&#...
Sunday, March 10, 2013 at 2:01pm

physics
the olympic record for the marathon is 2.00 h 9.00 min 210 s. if the average speed of a runner achieving this record is 5.436 m/s, what is the marathon distance
Sunday, March 10, 2013 at 12:38pm

Physics
An alpha particle (charge +2e and mass 6.64 x10-27 kg) is traveling to the right at 1.50 km/s. What uniform electric field (magnitude and direction) is needed to cause it to travel to the left at the same speed after 2.65 s.?
Sunday, March 10, 2013 at 12:09pm

Physics
An alpha particle (charge +2e and mass 6.64 x10-27 kg) is traveling to the right at 1.50 km/s. What uniform electric field (magnitude and direction) is needed to cause it to travel to the left at the same speed after 2.65 s.?
Sunday, March 10, 2013 at 12:08pm

Physics
A car with engine trouble slides 85 meters up along a 14 degree ramp before coming to a stop. If the coefficient of friction between the tires and the road is 0.9, what was the velocity of the car at the bottom of the ramp? I'm not looking for a solution which includes ...
Sunday, March 10, 2013 at 11:46am

Physics
Suppose H⊗3|ϕ⟩=(1/2)√(|0​00⟩+|111⟩). What is |ϕ⟩? Specify the probability amplitude for each component:
Sunday, March 10, 2013 at 10:51am

physics
A 36 cm long copper wire carries a current of 6.0 A and weighs 0.45 N. A certain magnetic field is strong enough to balance the force of gravity on the wire. What is the strength of the magnetic field?
Sunday, March 10, 2013 at 10:09am

physics
A wire that is 70 cm long, carrying a current of 6.5 A, is at right angles to a uniform magnetic field. The magnitude of the force acting on the wire is 0.60 N. What is the strength of the magnetic field?
Sunday, March 10, 2013 at 10:09am

physics
A wire that is 0.45 m long and carrying a current of 9.5 A is at right angles to a 0.40 T magnetic field. How strong is the force that acts on the wire?
Sunday, March 10, 2013 at 10:08am

physics
The force acting on a wire that is at right angles to a(n) 0.80 T magnetic field is 2.1 N. The current in the wire is 6.7 A. How long is the wire?
Sunday, March 10, 2013 at 10:07am

physics
A wire that is 630 m long is perpendicular to a 0.31 T magnetic field. A 1.8 N force acts on the wire. What current is in the wire?
Sunday, March 10, 2013 at 10:06am

physics
A wire that is 46 cm long is parallel to a 0.54 T uniform magnetic field. The current through the wire is 4.5 A. What force acts on the wire?
Sunday, March 10, 2013 at 10:06am

physics
Gymnasts can do all sorts of ridiculous tricks on various equipment. In the rings event, the gymnast is supported by two rings attached by cords to the ceiling (see a picture here). If a gymnast weighs 75 kg and is motionless on the rings, what is the tension in each cord?
Sunday, March 10, 2013 at 8:31am

Physics
The system has two wheels and requires an effort of 12N to lift a load of 4kg at constant speed. Find M.A nd V.R.. Calculate work done by effort to raise load of 2m and efficiency of this machine.
Sunday, March 10, 2013 at 8:22am

Physics - URGENT
A car is speeding at constant velocity of 30ms-1 in an 80kmh-1 zone as it passes a stationary police motorcycle hiding. The motorcycle starts to accelerate at 5ms-2 at the same instant the car passes it and continues for 8 seconds. It then stops accelerating and maintains its ...
Sunday, March 10, 2013 at 1:43am

Physics - URGENT
A car is speeding at constant velocity of 30ms-1 in an 80kmh-1 zone as it passes a stationary police motorcycle hiding. The motorcycle starts to accelerate at 5ms-2 at the same instant the car passes it and continues for 8 seconds. It then stops accelerating and maintains its ...
Sunday, March 10, 2013 at 1:43am

Physics
the volume of a monoatomic ideal gas doubles in an adiabatic expansion. by considering 135 moles of gas with an initial pressure of 330kPa and an initial volume of 1.2m^3, the gas is then expands adiabatically to a volume of 2.4m^3. FIND THE WORK DONE BY THE GAS. Thank you.
Sunday, March 10, 2013 at 1:18am

physics
If a baseball moving at 96 m/s toward homeplate over a distance of 16 m how much force does it take to make the ball go 50 m from home plate after it is hit?
Sunday, March 10, 2013 at 12:26am

Physics
A boat sets off perpendicular to the bank, to cross a river width of 250m. The speed of the boat in still water is 3.20ms-1, however there is a current downstream at 1.20ms-1, which puss the boat sideways. a) Find the resultant velocity of the boat. b) Find the total distance ...
Saturday, March 9, 2013 at 10:04pm

physics
a uniform rod 100cm long and weighing 50N is supported on a horizontal position on a fulcrum which weights of 80N and 100N suspended on its ends. compute the position of the fulcrum
Saturday, March 9, 2013 at 9:41pm

Physics
A car with engine trouble slides 85 meters up along a 14 degrees ramp before coming to a stop. If the coefficient of friction between the tires and the road is 0.9, what was the velocity of the car at the bottom of the ramp? I get 32.43 meters / second is this correct?
Saturday, March 9, 2013 at 9:32pm

Physics
A 0.157kg ball is thrown straight up from 1.81m above the ground. Its initial vertical speed is 10.40m/s. A short time later, it hits the ground. Calculate the total work done by the force of gravity during that time.
Saturday, March 9, 2013 at 9:27pm

Physics
A pellet gun is fired straight downward from the edge of a cliff that is 15m above the ground. The pellet strikes the ground with a speed of 27 m/s. How long does it take for the pellet to reach the ground with an initial velocity of 5.9 m/s.
Saturday, March 9, 2013 at 8:41pm

Astronomy - Physics
Finally, we will look at a system that is in an orbit comparable to the Earth to see how the angle that the light strikes the surface and the length of day contribute to the total amount of energy that we receive from the Sun at the two solstices. Recall that the changing ...
Saturday, March 9, 2013 at 7:20pm

Astronomy - Physics
Now, wait until the planet is at the winter solstice (12:00am). a) How many hours of daylight are there on the winter solstice with the inclination at 45 degrees? Use the same criteria for the length of day that you used for the previous question. sunlight-hours = (angle ...
Saturday, March 9, 2013 at 7:19pm

Astronomy - Physics
Now let us consider the length of time that the Sun is visible. Wait until the planet is at the summer solstice (12:00am). a) How many hours of daylight are there on the summer solstice with the inclination at 45 degrees? To estimate the length of day, identify the time when ...
Saturday, March 9, 2013 at 7:18pm

1.) Two people of the same mass climb the same flight of stairs. The first person climbs the stairs in 25 s; the second person does so in 35 s. a) Which person does more work?Explain b) Which person produces more power?Explain 2.) Lee pushes a 20 kg mass 10 m across a floor ...
Saturday, March 9, 2013 at 5:27pm

physics
Four masses are arranged as shown. They are connected by rigid, massless rods of lengths 0.50 m and d = 0.73 m. What torque must be applied to cause an angular acceleration of 0.63 rad/s2 about the axis shown? 4 kg 3 kg 5 kg 2 kg
Saturday, March 9, 2013 at 4:50pm

physics
You've taken your neighbor's young child to the carnival to ride the rides. She wants to ride The Rocket. Eight rocket-shaped cars hang by chains from the outside edge of a large steel disk. A vertical axle through the center of the ride turns the disk, causing the ...
Saturday, March 9, 2013 at 3:49pm

physics
A toy train rolls around a horizontal 1.0-{\rm m}-diameter track. The coefficient of rolling friction is 0.15. What is the magnitude of the train's angular acceleration after it is released?
Saturday, March 9, 2013 at 3:47pm

Physics
A traffic light is suspended midway across a 60 meter wide street by a cable that is attached to vertical poles on either side of the street. When the traffic light is hung in the middle the cable sags 30 cm. If the light is 1500 kg what should be the minimum tension rating ...
Saturday, March 9, 2013 at 1:50pm

physics
A roller-coaster car has a mass of 1100 kg when fully loaded with passengers. As the car passes over the top of a circular hill of radius 20 m, its speed is not changing. (a) At the top of the hill, what is the normal force (using the negative sign for the downward direction) ...
Saturday, March 9, 2013 at 12:55pm

physics
The density of ice is 917 kg/m3, and the density of sea water is 1025 kg/m3. As shown is the figure, a polar bear climbs onto a piece of ice, which has a volume of 5.75 m3, and is floating in sea water. a) What is the mass of the piece of ice? b) What is the mass of the ...
Saturday, March 9, 2013 at 11:43am

Physics
A 3.23 kg ball is attached to a ceiling by a 1.31 m long string. The height of the room is 5.75 m. What is the gravitational potential energy of the ball relative to the ceiling? What is the gravitational potential energy of the ball relative to the floor? What is the ...
Saturday, March 9, 2013 at 11:08am

Physics
If the spring is compressed a distance of 0.144 m and the gun fired vertically as shown, the gun can launch a 18.5g projectile from rest to a maximum height of 19.5 m above the starting point of the projectile. Neglecting all resistive forces, determine the spring constant ...
Saturday, March 9, 2013 at 11:01am

Physics
A 71.1 kg man steps out a window and falls (from rest) 1.24 m to a sidewalk. What is his speed just before his feet strike the pavement? If the man falls with his knees and ankles locked, the only cushion for his fall is a 0.500 cm give in the pads of his feet. Calculate the ...
Saturday, March 9, 2013 at 3:23am

Physics
A stationary bomb of 10kg mass explodes into 3 fragments. two of these parts having mass 4kg and 2kg,fly apart perpendicular to each other with a velocity of 2ms-1 and 3ms-1.find magnitude and direction of 3rd part.
Saturday, March 9, 2013 at 1:45am

Physics
A stationary bomb of 10kg mass explodes into 3 fragments. two of these parts having mass 4kg and 2kg,fly apart perpendicular to each other with a velocity of 2ms-1 and 3ms-1.find magnitude and direction of 3rd part.
Saturday, March 9, 2013 at 1:45am

Physics
a boat crosses a 2 km wide river by starting out at the south shore and heading directly for the north shore if the river flows at 0.8 m/s and the boat can go at 1.4 m/s in still water, where on the opposite shore will the boat land?
Saturday, March 9, 2013 at 1:41am

Physics
a boat crosses a 2 km wide river by starting out at the south shore and heading directly for the north shore if the river flows at 0.8 m/s and the boat can go at 1.4 m/s in still water, where on the opposite shore will the boat land?
Saturday, March 9, 2013 at 1:41am

Physics
A ball of 0.5kg mass hits a wall at an angle of 30° and is then reflected making an angle of 90° with its original direction. if the duration of contact between the ball and the wall is 0.1s,calculate the force exerted on the wall. the initial and final velocities of ...
Saturday, March 9, 2013 at 1:25am

Lang. Arts
He became famous for his theories of (22) relativity and won the 1921 Nobel Prize for physics. relativity and won A.relativity, and won B.relativity and, won C.relativity, and, won D.no error I think it is D...?
Friday, March 8, 2013 at 10:16pm

Lang. Arts
Einstein (21) was however also publishing papers in physics. was however also A.was, however, also B.was however, also C.was, however also D.no error I think it is A...?
Friday, March 8, 2013 at 10:07pm

physics
A 71.1 kg man steps out a window and falls (from rest) 1.24 m to a sidewalk. What is his speed just before his feet strike the pavement?
Friday, March 8, 2013 at 9:46pm

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