|
Post a New Question | Current Questions | Chat With Live Tutors
Recent Homework Questions About Physics
Post a New Question | Current Questions
Physics
A smooth plane AB is 10 meters long, It is inclined at 30 degrees to the horizontal with the lower end, B, 6 meteres vertically above horixontal ground. A particle is placed on the plane at the upper end, A, and then released from erst so that it slides down the plane. Find ...
Physics
A particle is at rest at the apex A of a smooth fixed hemisphere whose base is horizontal. The hemisphere has centre O and radius a. The particle is then displaced very slightly from rest and moves on the surface of the hemisphere. At the point P on the surface where angle AOP...
Physics
A light-rail train going from one station to the next on a straight section of track accelerates from rest at 1.1 m/s^2 for 20 m . It then proceeds at constant speed for 110m before slowing down at 2.2 m/s^2 until it stops at the station.
Physics!! Help!!!!!
. A neutral conducting sphere contains a spherical cavity. A point charge +q is located at the |center of the cavity. A. What is the total surface charge on the interior surface of the conductor? B. What is the total charge on the exterior surface of the conductor?
Physics
Suppose that you have a spring gun that you use to launch a small metal ball. You try the first two settings of the gun. The first setting compresses the spring by 1 cm and fires the ball a distance of 0.25 m . The second setting compresses the spring by 2 cm and fires the ...
Physics - Verification
Hello, just wanted to verify is what I did is good. I posted this question yesterday and Bob helped me, so just wanted to be sure it's good. The problem is: A bloc of 10 kg is put at the top of an inclined plan of 45 degrees (to the left), attached to a spring which has a ...
physics 213
A duck has a mass of 2.80 kg. As the duck paddles, a force of 0.120 N acts on it in a direction due east. In addition, the current of the water exerts a force of 0.190 N in a direction of 48.0 ° south of east. When these forces begin to act, the velocity of the duck is 0....
physics
A person looking out the window of a stationary train notices that raindrops are falling vertically down at a speed of 8.1 m/s relative to the ground. When the train moves at a constant velocity, the raindrops make an angle of θ = 25° when they move past the window as...
physics
A rocket is fired at a speed of 75.0 m/s from ground level, at an angle of 68.6° above the horizontal. The rocket is fired toward an 11.0 m high wall, which is located 26.0 m away. The rocket attains its launch speed in a negligibly short period of time, after which its ...
physics
A train 400 m long is moving on a straight track with a speed of 80.1 km/h. The engineer applies the brakes at a crossing, and later the last car passes the crossing with a speed of 16.9 km/h. Assuming constant acceleration, determine how long the train blocked the crossing. ...
physics
Question Part Points Submissions Used A quarterback claims that he can throw the football a horizontal distance of 196.6 m (215 yd). Furthermore, he claims that he can do this by launching the ball at the relatively low angle of 30° above the horizontal. To evaluate his ...
Physics - 2-D kinematics
A soccer ball is kicked with an initial horizontal velocity of 20 m/s and an initial vertical velocity of 16 m/s. I've calculated: Initial Speed: 25.61 m/s Angle: 38.66 degrees Maximum Height it reaches: 13.06 m Distance kicked: 65.29m NOW I NEED: What is the speed of the ...
physics
A 200g mass attached to a horizontal spring oscillates at a frequency of 2.0 Hz. At one instant, the mass is at x= 5.0cm and has v= -30cm/s. find amplitude
physics
The boy on the tower of height h = 18 m in the figure below throws a ball a distance of x = 62 m, as shown. At what speed, in m/s, is the ball thrown?
Physics
This question contains a graph: h t t p : / / i . i m g u r . c o m / Q z l x d . p n g
Physics
A car that weighs 14600.0 N is initially moving at a speed of 58.0 km/hr when the brakes are applied and the car is brought to a stop in 4.7 s. Find the magnitude of the force that stops the car, assuming it is constant.
physics
A 39-kg girl standing at rest on slippery (frictionless) ice throws a 10-g ball forward with a speed of 10 m/s. Just afterward, the girl will
physics
An engine draws water from a depth of 10 m from earth at aspeed of 2m/s at arate of 10 kg/10 s. What is the power of the engine?
physics
a crate sits on the floor of a boxcar. the coefficient of fritcion between the crate and the florr is .600. what is the maximum speed that the boxcar can go around a curve of radius 200 m. without causing the crate to slide?
Physics
A car is traveling due east at 25.0 m/s. If it accelerates at 0.750 m/s^2 due east find it's velocity after 8.50 s have elapsed.
physics
A 25mC charge is placed at the end of a meter stick and a 4.omC charge is placed at the 50cm mark.At what position on the line joining the two charges is the electric field zero?
physics
A train 400 m long is moving on a straight track with a speed of 80.1 km/h. The engineer applies the brakes at a crossing, and later the last car passes the crossing with a speed of 16.9 km/h. Assuming constant acceleration, determine how long the train blocked the crossing. ...
physics
A car starts from rest and travels for 6.0 s with a uniform acceleration of +2.4 m/s2. The driver then applies the brakes, causing a uniform acceleration of −1.0 m/s2. If the brakes are applied for 3.0 s, determine each of the following. (a) How fast is the car going at ...
physics
Can water,air and earth conduct electricity? If yes, then explain how they conduct electricity.
Physics
On a spacecraft, two engines are turned on for 666 s at a moment when the velocity of the craft has x and y components of velocity V0x = 3485 m/s and V0y = 5690 m/s. While the engines are firing, the craft undergoes a displacement that has components of x = 4.48 * 10^6 m and y...
Physics
Show that Keplar's third law works for each of the terrestrial planets?
Physics
A ball is thrown straight up and rises to a maximum height of 20 m above the ground. At what height is the speed of the ball equal to half of its initial value? Assume that the ball starts at a height of 2.1 m above the ground.
Physics
In a game of American football, a quarterback takes the ball from the line of scrimmage and runs backwards for 10 yards, and then sideways to the left, parallel to the line of scrimmage for 15 yards. At this point, he throws a forward pass at the angle of 60 degrees with ...
physics
e relative to the ground. The airplane’s speed relative to the air is 77.9 km/h. Answer in units of km/h
Physics
A ball is thrown horizontally from the top of a building 21.6 m high. The ball strikes the ground at a point 123 m from the base of the building. Find the x component of its velocity just before it strikes the ground. Find the y component of its velocity just before it ...
Physics
In the vertical jump, Kobe Bryant starts from a crouch and jumps upward to reach as high as possible. Even the best athletes spend little more than 1.00 second in the air (their "hang time"). Treat Kobe as a particle and let ymax be his maximum height above the floor...
Physics
A car travels 105 km to the north at 65km/hr and then turns around and travels 25km at 80km/hr. What is the difference between the average speed and the average velocity on this trip?
physics
The mass of 1 cubic meter of air at sea level is about 1.3kg. Hoe much does it weight in newtons? How much would a stack of 8000 such cubes weigh? If this total weight were all applied to an area of 1m^2, how much pressure would it produce on that surface? The answer should ...
physics
What is the speed in meters per second of a baseball traveling at 64 mph given that 1 mph = 0.447 m/s?
physics
A football is thrown with an initial upward velocity component of 13.5 {\rm m}/{\rm s} and a horizontal velocity component of 19.0 {\rm m}/{\rm s}.
physics
A 0.500 ice puck, moving east with a speed of 6.70 , has a head-on collision with a 0.700 puck initially at rest. Assuming a perfectly elastic collision, what will be the speed of the 0.500 object after the collision? What will be the speed of the 0.700 object after the ...
Physics
The figure shows an electron entering a parallel-plate capacitor with a speed of 5.65×106 . The electric field of the capacitor has deflected the electron downward by a distance of 0.618 at the point where the electron exits the capacitor.
physics
The speed of radio waves is 3*10^8m/s, the same as the speed of light. If a spacecraft transmits a radio signal with frequency 3*10^9Hz, what is the wavelength of those waves?
physics
A person pushes a 17.0 kg lawn mower at constant speed with a force of 74.0 N directed along the handle, which is at an angle of è = 48.0° to the horizontal (b) Calculate the horizontal retarding force on the mower (c) Calculate the normal force exerted vertically ...
physics
A baseball is hit at 3)53m/s degrees with the horizontal. An outfielder runs at 4m/s toward the Winfield and catches the ball. What was the original distance between the batter and the outfielder???
Physics
A 6490 kg helicopter accelerates upward at 0.59 m/s2 while lifting a 1180 kg car. (a) What is the lift force exerted by the air on the rotors? N (b) What is the tension in the cable (ignore its mass) that connects the car to the helicopter?
Physics
A particle of charge +1.00 x 10e-6 C is 15.0 cm distant from a second particle of charge -3.00 x 10e-6 C. Calculate the magnitude of the electrostatic force between the particles.
Physics
A charge of 6.0 mC is to be split into two parts that are then separated by 3.00 mm. What is the maximum possible magnitude of the electrostatic force between those two parts?
physics
An electron is released from rest in a uniform electric field of magnitude 2.00 x 10e4 N/C. Calculate the acceleration of the electron (neglect gravitation).
physics
A person throws a 2.50 lb stone into the air with an initial upward speed of 15.0 ft/s. Part A- Make a free-body diagram of the forces for this stone after it is free of the person's hand and is traveling upward Part B - Make a free-body diagram of the forces for this ...
Physics
A cannon is fired from a cliff 190 m high downward at an angle of 21° with respect to the horizontal. If the muzzle velocity is 34 m/s, what is its speed (in m/s) when it hits the ground?
Physics
In a 100 m race, Maggie and Judy cross the finish line in a dead heat, both taking 10.6 s. Accelerating uniformly, Maggie took 2.20 s and Judy 2.90 s to attain maximum speed, which they maintained for the rest of the race. What was Maggie's acceleration?
Physics
A bloc of 10 kg is put at the top of an inclined plan of 45 degrees (to the left), attached to a spring which has a spring constant of 250 N/m. The coefficient of kinetic friction between the bloc and the surface of the inclined plan is of 0,300. What is the maximum elongation...
physics
a truck with a mass of 1,500 kg is parked on a hill with a slope of 7 degrees. the parking break is released and the truck starts to roll down the hill. a) assuming friction is negligible what will by the force that moves the car down the hill? b) what will the speed of the ...
physics
a truck with a mass of 1,500 kg is parked on a hill with a slope of 7 degrees. the parking break is released and the truck starts to roll down the hill. a) assuming friction is negligible what will by the force that moves the car down the hill? b) what will the speed of the ...
Physics
A driver in a car traveling at a speed of 56.0 mi/h sees a deer 116 m away on the road. Calculate the minimum constant acceleration that is necessary for the car to stop without hitting the deer (assuming that the deer does not move in the meantime).
physics
A hawk flies in a horizontal arc of radius 15.7 m at a constant speed of 3.8 m/s. Find its centripetal acceleration. Answer in units of m/s 2 006 (part 2 of 2) 10.0 points It continues to fly along the same horizontal arc but increases its speed at the rate of 1....
physics
an originally stationary car with a mass of 1500 kg reaches a velocity of 15 m/sec 5 sec after starting. what is the cars acceleration? how much force was required to reach this acceleration?
physics
The mass of 1 cubic meter of air at sea level is about 1.3kg. Hoe much does it weight in newtons? How much would a stack of 8000 such cubes weigh? If this total weight were all applied to an area of 1m^2, how much pressure would it produce on that surface? The answer should ...
Physics
A certain capacitor stores 473 J of energy when it holds 7.91 x 10−2 C of charge. What is the capacitance of this capacitor? What is the potential difference across the plates?
Physics
Charges of +2.38 nC and -1.06 nC are located at opposite corners, A and C, respectively, of a square which is L = 1.13 m on a side. What is the electric potential at a third corner, B, of the square (where there is no charge)?
Physics
Find the electric field at the center of a square of side L = 1.19 cm with charges of Q = +8.16 μC at each corner. Calculate the potential at the center of that square.
Physics
If you fasten lumps of clay on the prongs of a tuning fork, does this change the amount of moving mass? Does it change the stiffness of the pongs? Explain then whether the fork's natural frequency of oscillation is increased or decreased by adding the clay?
physics
If a violin string vibrates at 1720Hz, what is the wavelength of the sound produced in the surrounding air? (assume T=20 degree Celsius and speed is 344m/s)
Physics
A basketball is released from a height of 3m onto a hard surface. What height will the ball rebound to and why ?
physics
An artillery shell is launched on a flat, horizontal field at an angle of a = 43.5° with respect to the horizontal and with an initial speed of v0 = 263 m/s. What is the horizontal distance covered by the shell after 6.77 s of flight? What is the height of the shell at ...
physics
A cannon is fired from a cliff 190 m high downward at an angle of 21° with respect to the horizontal. If the muzzle velocity is 34 m/s, what is its speed (in m/s) when it hits the ground?
Physics
The brakes of a certain 2400 lb car can exert a maximum force of 750 lbs. What is the minimum time needed to slow the car down from 60 ft? How far does the car travel in this time? Please indicate the formula used.
Physics
How much force is needed to bring a 3200 lb car from rest to a velocity of 44 ft/s in 8 seconds? Please indicate the formula used.
Physics
A net force of 150 lbs acts on a body whose weight is 96 lbs. What is its acceleration? Please indicate the formula used.
Physics
A net force of 75 lbs acts on a body of mass 25 slugs which is initially at rest. Find its acceleration. How fast will the body be moving 12 seconds later? Please indicate the formula used.
Physics
What is the weight of an object whose mass is 50 slugs? What is the mass of an object whose weight is 50 lbs.? Please indicate formula used.
physics
what force is necessary to stop a 20 g bullet moving at 200 m/s as it penetrates a wood at a distance of 4 m?
Physics
A plane is headed east with an air speed of 294.0 m/s. The wind blows southeast at 42.0 m/s. Find the velocity of the plane relative to the earth.
Physics
A parallel-plate capacitor is constructed with circular plates of radius 0.056 m. The plates are separated by 0.25 mm, and the space between the plates is filled with dielectric with dielectric constant k. When the charge on the capacitor is 1.2 uc the potential difference ...
physics
A falling stone takes 0.320 s to pass a window 2.30 m high. From what height (in meters) above the top of the window did the stone fall? I have tried this so many times and I cannot figure it out.
Physics
A sleepy man drives a car along a straight section of highway at a constant speed of 89.6 km/h. His eyes begin to close, and his car moves at an angle of 4.90° relative to the road. For how long can his attention lapse before the car begins to move across the lane divider...
Physics
Two cars are traveling along a straight line in the same direction, the lead car at 24.5m/s and the other car at 29.8m/s. At the moment the cars are 41.4m apart, the lead driver applies the brakes, causing her car to have an acceleration of -2.05m/s2. A) How long does it take ...
Physics
Two cars are traveling along a straight line in the same direction, the lead car at 24.5m/s and the other car at 29.8m/s. At the moment the cars are 41.4m apart, the lead driver applies the brakes, causing her car to have an acceleration of -2.05m/s2. A) How long does it take ...
Physics
A young woman named Kathy Kool buys a sports car that can accelerate at the rate of 4.77 m/s2. She decides to test the car by dragging with another speedster, Stan Speedy. Both start from rest, but experienced Stan leaves the starting line 1.04 s before Kathy. If Stan moves ...
Physics
A ball is thrown upward from the ground with an initial speed of 23.1 m/s; at the same instant, a ball is dropped from a building 15.0 m high. After how long will the balls be at the same height?
Physics
A tortoise can run with a speed of 10.1 cm/s, and a hare can run 19.4 times as fast. In a race, they both start at the same time, but the hare stops to rest for 122 seconds. The tortoise wins by a shell (20.8 cm). How long does the race take? What is the length of the race?
Physics
In a 100 m race, Maggie and Judy cross the finish line in a dead heat, both taking 10.6 s. Accelerating uniformly, Maggie took 2.20 s and Judy 2.90 s to attain maximum speed, which they maintained for the rest of the race. A) What was Maggie's acceleration? B) What was ...
Physics
A driver in a car traveling at a speed of 56.0 mi/h sees a deer 116 m away on the road. Calculate the minimum constant acceleration that is necessary for the car to stop without hitting the deer (assuming that the deer does not move in the meantime).
Physics High School Rotational Motion
A wheel has a radius of 2.2 m. How far (path length) does a point on the circumference travel if the wheel is rotated through an angle of 190 rad? Answer in units of m
Physics
A 9500 kg boxcar traveling at 19 m/s strikes a stationary second car. The two stick together and move off with a speed of 10 m/s. What is the mass of the second car?
Physics
A 14000 kg railroad car travels alone on a level frictionless track with a constant speed of 24.0 m/s. A 6500 kg additional load is dropped onto the car. What then will be the car's speed?
physics
Entrance and exit ramps for freeways are often circular stretches of road. As you go around one at a constant speed, you will experience a constant acceleration. Suppose you drive through an entrance ramp at a modest speed and your acceleration is 3.0 {\rm m}/{\rm s}^{2}
physics
A cannon is fired from a cliff 190 m high downward at an angle of 21° with respect to the horizontal. If the muzzle velocity is 34 m/s, what is its speed (in m/s) when it hits the ground?
physics
An artillery shell is launched on a flat, horizontal field at an angle of a = 43.5° with respect to the horizontal and with an initial speed of v0 = 263 m/s. What is the horizontal distance covered by the shell after 6.77 s of flight? What is the height of the shell at ...
physics
it takes 14 seconds for a runner to go from 5m/s to 19m/s? how do you calucate acceleration
physics
During a circus performance, a 74.8-kg human cannonball is shot out of a 18.0-m-long cannon. If the human cannonball spends 0.844 s in the cannon, determine the average net force exerted on him in the barrel of the cannon.
physics
A raft is constructed of wood havig a density of 600kg/m^3. The surface area of the bottom of the raft is 5.7m^2 and the volume of the raft is .60m^3. When the raft is placed in fresh water having a density of 1000kg/m^3, how deep is the bottom of the raft below water level ?
physics
suppose a 1.50 kg object is suspended from the end of a silicone band. when the object is pulled down and released, the band vibrates at a frequency of 2.08 s-1. calculate the spring constant of this silicone band including units.
Physics
A freight train has a mass of 1.7 107 kg. If the locomotive can exert a constant pull of 7.6 105 N, how long does it take to increase the speed of the train from rest to 64 km/h?
physics
Three carts of masses 5 kg, 12 kg, and 3 kg move on a frictionless horizontal track with speeds of 5 m/s, 8 m/s, and 4 m/s, as shown in figure. The carts stick together after colliding. 5 kg 12 kg 3 kg 5 m/s 8 m/s 4 m/s Find the final velocity of the three carts. ...
Physics C
A point charge of 5.5 µC is located at the center of a spherical shell of radius 30 cm, which has a charge −5.5 µC uniformly distributed on its surface. Given: ke = 8.98755 × 10^9 Find the electric field for a point inside the shell a distance 12 ...
Physics
A hot-air balloon is rising upward with a constant speed of 2.50 m/s. When the balloon is 3.00 m above the ground, the balloonist accidentally drops a compass over the side of the balloon. How much time elapses before the compass hits the ground?
Physics
A plane flies at 800km/h in stationary air. The distance to be traveled is 3000km. What was the wind speed if the journey actually takes 4.0 hours?
Physics
The anode (positive terminal) of an X-ray tube is at a potential of +105000 V with respect to the cathode (negative terminal). (a) How much work (in joules) is done by the electric force when an electron is accelerated from the cathode to the anode? J (b) If the electron is ...
Physics
A point charge q = -2.41 nC is initially at rest adjacent to the negative plate of a capacitor. The charge per unit area on the plates is 4.67 μC/m2 and the space between the plates is 6.53 mm. What is the potential difference between the plates? What is the kinetic ...
Physics
An alpha particle (helium nucleus, charge +2e) starts from rest and travels a distance of 1.88 cm under the influence of a uniform electric field of magnitude 12.2 kV/m. What is the final kinetic energy of the alpha particle?
physics
A hockey puck has no friction on it. It has a mass of 0.28 kg and experiences a force of 48 newtons. What is its acceleration?
Physics
An elevator (mass 4175 kg) is to be designed so that the maximum acceleration is 0.0700g. What is the maximum force the motor should exert on the supporting cable?
physics
A moving particle encounters an external electric field that decreases its kinetic energy from 9530 eV to 7800 eV as the particle moves from position A to position B. The electric potential at A is -69.0 V, and that at B is +39.0 V. Determine the charge of the particle. ...
physics
An electric car accelerates for 7.2 s by drawing energy from its 430-V battery pack. During this time, 1700 C of charge pass through the battery pack. Find the minimum power rating of the car.
Physics
A worker drives a 0.509 kg spike into a rail tie with a 2.08 kg sledgehammer. The hammer hits the spike with a speed of 63.3 m/s. If one fifth of the hammer’s kinetic energy is converted to the internal energy of the hammer and spike, how much does the total ...
Physics
A hiker, who weighs 990 N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs 3550 N, and rests on two concrete supports, one at each end. He stops one-fifth of the way along the bridge. What is the magnitude of the force that a...
physics
i am going a center of gravity problem, with the x=w1(x1)+w2x2..../ W1+W2.. and i keep getting the wrong answer can someone please tell me what i am doing wrong this is the problem:Four objects are situated along the y axis as follows: a 1.94 kg object is at +3.27 m, a 2.76 kg...
physics
A ball rolls off a platform that is 5 meters above the ground. The ball's horizontal velocity as it leaves the platform is 4.8 m/s. (a) How much time does it take for the ball to hit the ground? (Use g = 10 m/s2.) . s
physics
A car starts from rest at a stop sign. It accelerates at 4.6 m/s^2 for 7.4 s, coasts for 1.8 s, and then slows down at a rate of 3.5 m/s^2 for the next stop sign.How far apart are the stop signs?
Physics
A car is traveling 17 m/s when the driver sees a child standing on the road. He takes 0.8 s to react, then steps on the brakes and slows at 7.0 m/s2. How far does the car go before it stops?
Physics- moles and gas laws
What is the volume occupied by 8.0 g of hydrogen under a pressure of 2.8 atm and a temperature of 300 K?
Physics
An (63Kg) astronaut, floating alone in outer space, catches a 7Kg bowling ball traveling at 20m/s. The velocity of the astronaut and bowling ball after the catch is
physics
A 45.5-g Super Ball traveling at 29.0 m/s bounces off a brick wall and rebounds at 19.5 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 4.15 ms, what is the magnitude of the average acceleration of the ball during this time interval?
Physics
What is the acceleration of an 0.4m aluminum cube with a density of 2.72 in a beaker of methanol, which has a density of .791?
physics
A 5.50 bucket of water is accelerated upward by a cord of negligible mass whose breaking strength is 77.0 . If the bucket starts from rest, what is the minimum time required to raise the bucket a vertical distance of 14.0 without breaking the cord?
Physics net force and mass
Four boxes of various masses are placed on a friction free table. Rank these boxes according to net force by listing them in order from greatest to least. A) <-5N--| 5 kg |--10N-> B) <-10N--|10kg|-15N--> C) <-10N--|5kg|-15N--> D) <-5N--|20kg|-15N--> ...
Physics
urprisingly, very few athletes can jump more than 2.2 ft (0.66 m) straight up. Use d = 1/2 gt2 and solve for the time one spends moving upward in a 2.2 foot vertical jump. Then double it for the "hang-time" -- the time one's feet are off the ground.
Physics
A ball bounces vertically on the ground after being thrown vertically up into the air by a boy standing on the edge of a building
Physics
A bloc of 10 kg is put at the top of an inclined plan of 45 degrees (to the left), attached to a spring which has a spring constant of 250 N/m. The coefficient of kinetic friction between the bloc and the surface of the inclined plan is of 0,300. What is the maximum elongation...
physics
A person throws a 2.5 lb stone into the air with an initial upward speed of 15 ft/s. Make a free-body diagram for this stone (a) after it is free of the person’s hand and is traveling upward, (b) at its highest point, (c) when it is traveling down ward, and (d) while it ...
physics
An automobile travelling with an initial velocity of 25m/s is accelerated to 35m/s in 6 second. The wheel of automobile is 80cm in diameter. Find the angular acceleration
physics
suppose a 1.50 kg object is suspended from the end of a silicone band. when the object is pulled down and released, the band vibrates at a frequency of 2.08 s-1. calculate the spring constant of this silicone band including units.
physics
A motorcycle traveling 91.0 km/hr approaches a car traveling in the same direction at 83.0 km/hr. When the motorcycle is 52.0 m behind the car, the rider accelerates and passes the car 16.0 s later. What is the acceleration of the motorcycle (in meters/second^2)?
Physics
A capacitor is constructed of two concentric conducting cylindrical shells. The radius of the inner cylindrical shell is 2.35 10-3 m, and that of the outer shell is 2.49 10-3 m. When the cylinders carry equal and opposite charges of magnitude 1.61 10-10 C, the electric field ...
Physics
An electron is released from rest at the negative plate of a parallel plate capacitor and accelerates to the positive plate (see the drawing). The plates are separated by a distance of 1.4 cm, and the electric field within the capacitor has a magnitude of 3.5 106 V/m. What is ...
Physics
A car's initial velocity of 13.5 m/s accelerates at a rate of 1.9 m/s^2 for 6.2 s. Then, it accelerates at a rate of -1.2 m/s^2 until it stops. 1) What is the car's maximum speed? 2) What is the total time from the start of the first acceleration until the car is ...
Physics
A car is speeding at 33.4 m/s. A police car starts in pursuit from rest when the car is 100 m past the cruiser. At what rate must the cruiser accelerate to catch the speeder before the state line, 1.2 km away from the speeding car? Include all steps if possible please, so that...
Physics
Two particles Q and P are shot up vertically.P was first shot with velocity of40m/s and after4s.Q was also shot up.If upon meeting the velocity ofP is 15m/s.determine(1)where they met.(2)the velocity with which Q was shot up.Take g= 10m/s2
physics
calculate the force of gravity between earth (mass = 6.0 x 1024kg) and the moon (mass = 7.4 x 1022 kg). the average Earth-moon distance is 3.8 x 108 m.
Physics
Suppose a car is traveling at 14.0 m/s, and the driver sees a traffic light turn red. After 0.500 s has elapsed (the reaction time), the driver applies the brakes, and the car decelerates at 5.00 m/s2. What is the stopping distance of the car, as measured from the point where ...
Physics
A parallel plate capacitor has a capacitance of 1.71 nF. There is a charge of 0.809 μC on each plate.
Physics
Charges of -10.8 nC and -24.2 nC are separated by 0.813 m. What is the potential midway between the two charges?
Physics
A van de Graaff generator has a metal sphere of radius 14.2 cm. To what potential can it be charged before the electric field at its surface exceeds 2.01 x 106 N/C (which is sufficient to break down dry air and initiate a spark)?
Physics
A beam of electrons traveling with a speed of 3.00 x 107 m/s enters a uniform, downward electric field of magnitude 1.17 x 104 N/C between the deflection plates of an oscilloscope (the figure below ). The initial velocity of the electrons is perpendicular to the field. The ...
physics
suppose a 1.50 kg object is suspended from the end of a silicone band. when the object is pulled down and released, the band vibrates at a frequency of 2.08 s-1. calculate the spring constant of this silicone band including units.
physics
A 60kg boy is riding his bike to school. His acceleration is 15 m/sec^2. Determine the magnitude of the force he is exerting.
Physics
A plane is flying west at 214 km/h. The wind is blowing south at 108km/h. a what is the ground speed of the plane b In what direction does the plane travel
Physics
A particle is initially moving along the positive x-axis at a speed of 9.90 m/s. After 2.40 s, the particle is moving along the negative y-axis at a speed of 4.71 m/s. Find the x and y components of the particle's acceleration.
Physics
Two parallel plates are 4.85 cm apart. The bottom plate is charged positively and the top plate is charged negatively, producing a uniform electric field of 5.51 x 104 N/C in the region between the plates. What is the time required for an electron, which starts at rest at the ...
Physics
A boy tosses a football upward. If the football rises a vertical distance of 1.3 m and the boy catches it at the same point he released it, what is the velocity of the ball just before he catches it?
Physics
Capacitors are used in many applications where you need to supply a short burst of energy. A 143 μF capacitor in an electronic flash lamp supplies an average power of 12.6 kW to the lamp for 2.95 ms. To what potential difference must the capacitor initially be charged? ...
physics
Find the electric potential energy for the following array of charges: charge q1 = +3.0 µC is located at (x, y) = (0.0, 0.0) m; charge q2 = +3.0 µC is located at (4.0, 3.0) m; and charge q3 = −1.0 µC is located at (0.0, 3.0) m.
physics.
When temperature changes during the day, which scale, Celsius or Fahrenheit, will read a smaller change? and why?
physics
A certain capacitor stores 473 J of energy when it holds 7.91 x 10−2 C of charge. What is the capacitance of this capacitor? What is the potential difference across the plates?
physics
A hydrogen atom has a single proton at its center and a single electron at a distance of approximately 0.0537 nm from the proton. What is the electric potential energy in joules?
Physics
You throw a ball straight down from an apartment balcony to the ground below. The ball has an initial velocity of 5.20 m/s, directed downward, and it hits the ground 2.10 s after it is released. Find the height of the balcony.
Physics
Karen has a mass of 62.60 kg and she rides the up escalator at Woodley Park Station of the Washington D.C. Metro. Karen rode a distance of 62 m, the longest escalator in the free world. How much work did the escalator do on Karen if it has an inclination of 35°?
Physics
An 845-N sled is pulled a distance of 190 m. The task requires 1.70 104 J of work and is done by pulling on a rope with a force of 124 N. At what angle is the rope held?
physics
A coin is placed on a vinyl stereo record that is making 33 1/3 revolutions per minute on a turntable. In what direction is the acceleration of the coin? Find the magnitude of the acceleration when the coin is placed 18 cm from the center of the record. What force accelerates ...
PHYSICS
Sheena can row a boat at 2.91 mi/h in still water. She needs to cross a river that is 1.24 mi wide with a current flowing at 1.54 mi/h. Not having her calculator ready, she guesses that to go straight across, she should head 60.0° upstream. (a) What is her speed with ...
PHYSICS
A dolphin wants to swim directly back to its home bay, which is 0.85 km due west. It can swim at a speed of 4.35 m/s relative to the water, but a uniform water current flows with speed 2.82 m/s in the southeast direction. (a) What direction should the dolphin head??? (b) How ...
PHYSICS
A ball is thrown from a point 1.1 m above the ground. The initial velocity is 20.3 m/s at an angle of 32.0° above the horizontal. (a) Find the maximum height of the ball above the ground??? (b) Calculate the speed of the ball at the highest point in the trajectory???
PHYSICS
A tennis ball is thrown horizontally from an elevation of 20.60 m above the ground with a speed of 21.0 m/s vertical m from ground??? f the ball is still in the air, how long before it hits the ground? (If the ball is not in the air, enter 0.)???? If the ball is still in the ...
Pages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next>> Post a New Question | Current Questions
Homework Help: Science
For Further Reading
|
