Wednesday

April 1, 2015

April 1, 2015

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**Physics**

A Van de Graaff generator is a device for generating a large electric potential by building up charge on a hollow metal sphere. A typical classroom-demonstration model has a diameter of 30 cm. How much charge is needed on the sphere for its potential to be 530,000 V?
*Wednesday, April 1, 2015 at 7:47pm*

**physics**

A hydraulic cylinder has to overcome a force of 12,600 pounds on the extend stroke and 9,375 pounds on the return stroke. The maximum system pressure available is 2200 PSIG. What is the smallest diameter cylinder required to overcome the load and what is the maximum diameter ...
*Wednesday, April 1, 2015 at 7:26pm*

**Physics- Solenoid Questions**

1) A technician has been given wire that can safely carry 5 A. She has been instructed to construct a solenoid that will have a magnetic field of 0.06 T at its center. After completing some tests of the wire, the technician finds that the tightest safe winding possible with ...
*Wednesday, April 1, 2015 at 4:05pm*

**physics**

A 2inch diameter pipe has been chosen to pass 65 GPM. Can this diameter be used for the suction line? If not , what line diameter should be specified?
*Wednesday, April 1, 2015 at 4:03pm*

**physics**

. An open tank holding 400 cubic foot of air at atmospheric pressure at 70 degrees F and heated to 160 degree F. What is the volume of air that escapes from the tank?
*Wednesday, April 1, 2015 at 4:02pm*

**Physics Help Please**

A solenoid 20 cm long is constructed from 500 loops of wire and carries a current of 5 A as seen the diagram below. A tiny hole is drilled through the diameter of the solenoid in such a way that the current through the solenoid is not disrupted. If an electron flies through ...
*Wednesday, April 1, 2015 at 4:01pm*

**physics**

A rod with a length L = 0.385 m and a nonuniform linear mass density rests along the y axis with one end at the origin. If the linear mass density of the rod is given by λ = (5.00 ✕ 10−2 kg/m) + (1.50 ✕ 10−2 kg/m2)y then a) what is the total mass...
*Wednesday, April 1, 2015 at 3:28pm*

**physics**

(b) A boy wishes to walk on ice block at a constant speed. The coefficient of sliding friction for steel on ice is 0.05 and the boy weighs 150 N. Find the force required to keep the boy moving at a constant speed along the ice.
*Wednesday, April 1, 2015 at 6:39am*

**Physics**

If you take a pendulum clock from Paris to Cayenne, French Guiana, it loses 2.5 min each day. If the period of a pendulum of given length is proportional to 1/sqrt(g), and if g = 980.9 cm/s^2 in Paris, what is g in Cayenne? ...Um...I'm not entirely sure where to start. Do ...
*Wednesday, April 1, 2015 at 3:04am*

**Chemistry physics**

3.25x10-3 kg of gold is deposited onto the negative electrode of an electrolytic cell in a period of 2.78 hours, what is the current through this cell in amperes? Assume that the gold ions carry one elementary unit of charge
*Tuesday, March 31, 2015 at 11:42pm*

**Physics**

If 3.25x10-3 kg of gold is deposited onto the negative electrode of an electrolytic cell in a period of 2.78 hours, what is the current through this cell in amperes? Assume that the gold ions carry one elementary unit of charge
*Tuesday, March 31, 2015 at 10:53pm*

**physics**

A 2inch diameter pipe has been chosen to pass 65 GPM. Can this diameter be used for the suction line? If not , what line diameter should be specified?
*Tuesday, March 31, 2015 at 6:55pm*

**physics**

. An open tank holding 400 cubic foot of air at atmospheric pressure at 70 degrees F and heated to 160 degree F. What is the volume of air that escapes from the tank?
*Tuesday, March 31, 2015 at 6:54pm*

**physics**

A 25HP electric motor turning a 1800 RPM will produce how many foot pounds of torque?
*Tuesday, March 31, 2015 at 6:53pm*

**Physics**

A 0.20kg ball on a string is whirled on a vertical circle at a constant speed.When the ball is at 3 o'clock position, the string tension is 20N.Find the tensions in the string when the ball is at 12 o'clock and 6 o'clock positions
*Tuesday, March 31, 2015 at 3:15pm*

**physics**

A man of mass 90kg carries a block of mass 20kg up a vertical ladder at length 5m. What work has the woman done. (take g 10m /s)
*Tuesday, March 31, 2015 at 1:28pm*

**Physics**

A uniform cylindrical spool of mass M and radius R unwinds an essentially massless rope under the weight of a mass m. If R = 12 cm, M = 400 gm and m = 50 gm, find the speed of m after it has descended 50 cm starting from rest. Solve the problem twice: once using Newton's ...
*Tuesday, March 31, 2015 at 1:18pm*

**Physics**

Which best explains why openness is important to the progress of science?
*Tuesday, March 31, 2015 at 12:16pm*

**Physics**

A costant force F iss applied to a crate of mass 25kg to move it upwards along a frictionless inclined plane, when it reaches point A, its speed is 12m.s and 10,8 m,s when it reaches point B which is 3,5m futher up the incline. 5,1 give a reason why the normal force does no ...
*Tuesday, March 31, 2015 at 12:13pm*

**Physics**

A costant force F is aplied to a crate of mass 25kg to move it upward along a frictionless inclined plane.when it reaches point A,its speed is 12 m.s-1 and 10,8 m,s-1 when it reaches point B which is 3.5m futher up the incline
*Tuesday, March 31, 2015 at 11:58am*

**Physics**

At an intersection a car of mass 900kg traveling east collides with a pick up truck of mass 1800kg that is traveling North. Two vehicles stick together as a result of the collision, and after collision, the wreckage is sliding at 16m/sec in the direction 24 degrees East of ...
*Tuesday, March 31, 2015 at 11:54am*

**physics**

A copper atom has 29 electrons revolving around the nucleus. A copper ball has 4x10^23 atoms. What fraction of the electrons be removed to give the ball a charge of +9.6uC?
*Tuesday, March 31, 2015 at 9:14am*

**Physics**

The force acts on a 1.7kg object whose initial speed is 0.44m/s and initial position is x = 0.27. Find the speed of the object when it is a the location x = 0.99m?
*Tuesday, March 31, 2015 at 6:34am*

**physics**

At 7.15 cents per kilowatt-hour, what does it cost to leave a 75.0W light burning 24.0 hours a day?
*Tuesday, March 31, 2015 at 12:59am*

**Physics **

Determine the amount of energy required to raise the temperature of 250 grams of steel from a temperature of 15 oC to a temperature of 40 oC . The specific heat of steel is 0.11 cal/gram oC.
*Monday, March 30, 2015 at 9:41pm*

**physics**

In 1993, Cuban athlete Javier Sotomayor set the world record for the high jump. the gravitational potential energy associated with Sotomayor's jump was 1970 J. Sotomayor's mass was 82.0 kg. How high did Sotomayor Jump?
*Monday, March 30, 2015 at 9:16pm*

**physics**

a window air conditioner is estimated to have a cost of operation of $50 per 30 days. this is based on the assumption that the air conditioner will run half of the time and that electricity costs $.090 per kWh. determine how much current the air conditioner will take from a ...
*Monday, March 30, 2015 at 9:03pm*

**Physics**

A charged capacitor, C = 40 micro F, is connected to a resistor, 120 ohms. How much time will elapse until the voltage falls to 25% of its original (max) value? im not even sure what equation to use for this, so if someone could help me to figure that out it wou ld be greatly ...
*Monday, March 30, 2015 at 8:08pm*

**physics**

A 0.205 kg bird flying along at 7.8 m/s sees a 0.029 kg insect heading straight toward it with a speed of 15 m/s (as measured by an observer on the ground, not by the bird). The bird opens its mouth wide and enjoys a nice lunch. What is the bird's speed immediately after ...
*Monday, March 30, 2015 at 6:34pm*

**physics **

A freshman smart alek lips off onces too often! The assistant principle loses her cool and grabs the 38.0kg punk by the hair- swinging him in a vertical circle of radius 1.20m! if the freshman is moving at 6.30m/s at the bottom of the swing, calculate: A) the tensions in the ...
*Monday, March 30, 2015 at 6:27pm*

**physics**

The principle of conservation of heat energy states that
*Monday, March 30, 2015 at 6:17pm*

**PHYSICS NEED HELP ASAP**

A freshman smart alek lips off onces too often! The assistant principle loses her cool and grabs the 38.0kg punk by the hair- swinging him in a vertical circle of radius 1.20m! if the freshman is moving at 6.30m/s at the bottom of the swing, calculate: A) the tensions in the ...
*Monday, March 30, 2015 at 6:15pm*

**physics**

a 60-kilogram astronaut floating in space outside the capsule throws his 0.50-kilogram hammer such that it moves with a speed of 10 m/s relative to the capsule. what happens to the astronaut?
*Monday, March 30, 2015 at 4:30pm*

**physics**

a 50g slug is shot from a rifle at 900m/s a) what is the KE of the slug? b) how much work is done on the slug if it starts from rest?
*Monday, March 30, 2015 at 2:33pm*

**Physics**

So, "a uniform steel rod of length 1.20 meters and mass 6.40 kg has attached to each end a small ball of mass 1.06 kg. The rod is constrained to rotate in a horizontal plane about a vertical axis through its midpoint." There's more to the question, but the only ...
*Monday, March 30, 2015 at 1:31pm*

**physics**

A merry-go-round rotates at the rate of 0.16 rad/s with a(n) 43.0 kg man standing at a point 2.4 m from the axis of rotation. What is the new angular speed when the man walks to a point 0.64 m from the center? Assume that the merry-go-round is a solid 5.99 ×102 kg ...
*Monday, March 30, 2015 at 1:17am*

**physics**

Part 2: Complete the following math problems by using the Law of Momentum Conservation. Formulas: i. Momentum = (mass) * (velocity) ii. Impulse = (Applied force) * (time) and Impulse = Change in Momentum iii. Applied Force = (Change in Momentum) / (time) iv. For multiple ...
*Sunday, March 29, 2015 at 6:27pm*

**physics**

A 8.0 kg shell leaves a 2.0 x 103 kg cannon, at a speed of 4.0 x 102 m/s. What is the recoil speed of the cannon?
*Sunday, March 29, 2015 at 6:26pm*

**Physics**

A uniform disk of radius 0.5 m and mass 3.9 kg is rotating about its center of mass. Its moment of inertia about its center of mass is I=(1/2)mR^2. Its angular velocity as a function of time is given by (t)=7kt^6/t1^7 where k = 3.8 rad and t1= 5 s. Find the magnitude of the ...
*Sunday, March 29, 2015 at 5:03pm*

**Physics**

A motorist is trying to loosen a stubborn lugnut by standing on the end of a wrench. The wrench is inclined 33.8 degrees above the horizontal and the distance from the center of the nut to the end of the wrench is 0.60 m. Assuming the motorist does not bounce up and down on ...
*Sunday, March 29, 2015 at 4:58pm*

**Physics**

A cup of coffee is on a table in an airplane flying at a constant altitude and a constant velocity. The coefficient of static friction between the cup and the table is 0.420 . Suddenly, the plane accelerates forward, its altitude remaining constant. What is the maximum ...
*Sunday, March 29, 2015 at 2:38pm*

**Physics**

The drawing (not to scale) shows one alignment of the sun, earth, and moon. The gravitational force that the sun exerts on the moon is perpendicular to the force that the earth exerts on the moon. The masses are: mass of sun=1.99 × 1030 kg, mass of earth=5.98 × ...
*Sunday, March 29, 2015 at 1:14pm*

**Physics**

An eagle is flying horizontally at 5.8 m/s with a fish in its claws. It accidentally drops the fish. (a) How much time passes before the fish's speed doubles? (b) How much additional time would be required for the speed to double again?
*Sunday, March 29, 2015 at 12:18pm*

**physics**

A proton is acted on by an uniform electric field of magnitude 233 N/C pointing in the positive x direction. The particle is initially at rest. (a) In what direction will the charge move? (b) Determine the work done by the electric field when the particle has moved through a ...
*Sunday, March 29, 2015 at 12:09pm*

**physics**

a body projected with velocity 30m/s an angle 30¡ã with horizontal maximum height attained by he object is.........?
*Sunday, March 29, 2015 at 12:06pm*

**physics**

(a) A charged particle accelerates as it moves from location A to location B. If V A = 170 V and V B = 210 V, what is the sign of the charged particle? positive negative (b) A proton gains electric potential energy as it moves from point 1 to point 2. Which of the following is...
*Sunday, March 29, 2015 at 11:32am*

**physics**

Two parallel conducting plates are separated by 10.0 cm, and one of them is taken to be at zero volts. (a) What is the electric field strength between them, if the potential 8.50 cm from the zero volt plate (and 1.50 cm from the other) is 450 V? kV/m (b) What is the voltage ...
*Sunday, March 29, 2015 at 10:22am*

**Physics**

a red car and a green car move toward each other in adjacent lanes and parallel to an x axis. At time t = 0, the red car is at xr = 0 and the green car is at xg = 212 m. If the red car has a constant velocity of 23.0 km/h, the cars pass each other at x = 44.2 m. On the other ...
*Sunday, March 29, 2015 at 5:41am*

**physics**

An ideal gas has an initial volume of 500 cm3 , an initial temperature of 20◦C, and an initial pressure of 2 atm. What is its final pressure if the volume is allowed to expand to 1000 cm3 while the temperature increases to 60◦C?
*Sunday, March 29, 2015 at 5:00am*

**physics**

If 50 g of ice at −5 ◦C is mixed into 300 g of water at 60◦C in a completely insulated container, what is the final equilibrium temperature of the water? Why did we insist on the container being completely insulated?
*Sunday, March 29, 2015 at 5:00am*

**physics**

A spherical buoy of radius 25 cm and mass 8 kg sits in sea water of density 1025 kg/m3 . At low tide its anchoring chains have got tangled. What is the maximum tension force this chain may have to withstand at high tide? Assume calm conditions.
*Sunday, March 29, 2015 at 4:59am*

**physics**

1) What average power is required for a runner with a mass of 85 kg to reach a speed of 8 m/s from a stationary start during a time of 2 s? 2) A 1000 kg car travels east at 30 m/s and collides with a 3400 kg truck travelling south at 20 m/s. After the collision the two ...
*Sunday, March 29, 2015 at 4:59am*

**physics**

A simple harmonic oscillator executes motion whose amplitude is 0.20 m and it completes 60 oscillations in 2 minutes. i) Calculate its time period and angular frequency. ii) If the initial phase is 45°, write expressions for instantaneous displacement, velocity and ...
*Sunday, March 29, 2015 at 4:38am*

**physics dicussion question**

is there any physics teachers available to help right now?
*Saturday, March 28, 2015 at 11:37pm*

**Medical physics**

1.A hypodermic needle of lenght 0.020m and inner radius 3.0 x10^-4 is used to force water at 20 degree celcious into the air at a flow rate of 1.0 x10^-7m^2 s-1 (a) what is the average velocity in the needle?(assume laminar flow), (b) what is the pressure drop necessary to ...
*Saturday, March 28, 2015 at 10:28pm*

**physics**

The steel I-beam in the drawing has a weight of 1.75 × 103 N and is being lifted at a constant velocity. The angles are at 70 degrees. What is the tension in each cable attached to its ends?
*Saturday, March 28, 2015 at 9:12pm*

**physics**

A cup of coffee is on a table in an airplane flying at a constant altitude and a constant velocity. The coefficient of static friction between the cup and the table is 0.420 . Suddenly, the plane accelerates forward, its altitude remaining constant. What is the maximum ...
*Saturday, March 28, 2015 at 9:11pm*

**physics**

A 46.2-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.566 and 0.440, respectively. What horizontal pushing force is required to (a) just start the crate moving and (b) slide the crate across the dock at a constant speed?
*Saturday, March 28, 2015 at 9:10pm*

**physics**

The gravitational force that the sun exerts on the moon is perpendicular to the force that the earth exerts on the moon. The masses are: mass of sun=1.99 × 1030 kg, mass of earth=5.98 × 1024 kg, mass of moon=7.35 × 1022 kg. The distances shown in the drawing ...
*Saturday, March 28, 2015 at 9:10pm*

**physics**

A criminal is escaping across a rooftop and runs off the roof horizontally at a speed of 4.6 m/s, hoping to land on the roof of an adjacent building. Air resistance is negligible. The horizontal distance between the two buildings is D, and the roof of the adjacent building is ...
*Saturday, March 28, 2015 at 9:09pm*

**physics**

A golfer imparts a speed of 25.8 m/s to a ball, and it travels the maximum possible distance before landing on the green. The tee and the green are at the same elevation. (a) How much time does the ball spend in the air? (b) What is the longest "hole in one" that the...
*Saturday, March 28, 2015 at 9:09pm*

**physics**

A flat (unbanked) curve on a highway has a radius of 220m. A car rounds the curve at a speed of 25m/s. What is the minimum coefficient of friction that will prevent sliding?
*Saturday, March 28, 2015 at 8:20pm*

**physics**

An unstretched ideal spring hangs vertically from a fixed support. A 0.4 kg object is then attached to the lower end of the spring. The object is pulled down to a distance of 35cm below the unstretched position and released from rest at t=0s. A graph of the subsequent vertical...
*Saturday, March 28, 2015 at 7:09pm*

**physics**

Calculate the net charge on a substance consisting of a combination of 6.7 ✕ 10^13 protons and 3.0 ✕ 10^13 electrons.
*Saturday, March 28, 2015 at 3:20pm*

**physics**

A golfer imparts a speed of 25.8 m/s to a ball, and it travels the maximum possible distance before landing on the green. The tee and the green are at the same elevation. (a) How much time does the ball spend in the air? (b) What is the longest "hole in one" that the...
*Saturday, March 28, 2015 at 1:07pm*

**physics**

The gravitational force that the sun exerts on the moon is perpendicular to the force that the earth exerts on the moon. The masses are: mass of sun=1.99 × 1030 kg, mass of earth=5.98 × 1024 kg, mass of moon=7.35 × 1022 kg. The distances shown in the drawing ...
*Saturday, March 28, 2015 at 11:01am*

**physics**

A golfer imparts a speed of 25.8 m/s to a ball, and it travels the maximum possible distance before landing on the green. The tee and the green are at the same elevation. (a) How much time does the ball spend in the air? (b) What is the longest "hole in one" that the...
*Saturday, March 28, 2015 at 10:33am*

**Medical physics**

1.A hypodermic needle of lenght 0.020m and inner radius 3.0 x10^-4 is used to force water at 20 degree celcious into the air at a flow rate of 1.0 x10^-7m^2 s-1 (a) what is the average velocity in the needle?(assume laminar flow), (b) what is the pressure drop necessary to ...
*Saturday, March 28, 2015 at 8:49am*

**Physics**

A particle starts from the origin at t = 0 with an initial velocity of 4.8m/s along the positive x axis.If the acceleration is (-2.5 i^ + 4.3 j^)m/s2, determine (a)the velocity and (b)position of the particle at the moment it reaches its maximum x coordinate Express your ...
*Saturday, March 28, 2015 at 4:30am*

**physics**

mercury rotates about its own axis once every 58.6 Earth days. a satellite orbits mercury once every murcurian day. how high is this satellite above mercury's surface? mass of mercury = 3.2x10^23 kg. the radius of mercury is 2400km.
*Saturday, March 28, 2015 at 3:40am*

**mathematical physics**

Obtain the temperature distribution u(x,t) in a literally insulated rod of length L if both ends on the road are kept at 0°c and the initial temperature distribution in the bar is: u( x, 0 ) = 6sin[πx/L]
*Saturday, March 28, 2015 at 2:42am*

**mathematical physics**

Separate the following partial differential equation into a set of three ODEs by the method of separation of variables: d^2u/dt^2 =c^2,[d^2u/dr^2+1/r du/dr+1/r^2 d^2u/d theeta^2]
*Saturday, March 28, 2015 at 2:37am*

**mathematical physics**

Show that :(I) u = e^xsiny is a solution of Laplace's equation. (ii) u = x^2+t^2 is a solution of the wave equation.
*Saturday, March 28, 2015 at 2:29am*

**mathematical physics**

A series circuit consists of a resister with R = 200 ohm, an inductor with L = 1H, a capacitor with C = 0.002F, and a 12V battery. If the initial charge and current are both 0, find the charge and current at time t.
*Saturday, March 28, 2015 at 2:26am*

**mathematical physics**

Solve the initial value problem. d^2x/dt^2+2dx/dt-3x =0, x(2π) = 1, x(2π) = 13
*Saturday, March 28, 2015 at 1:55am*

**mathematical physics**

Show that : vector del(r^2) = 2vector r
*Saturday, March 28, 2015 at 1:48am*

**mathematical physics**

For any two vectors u and v show that : ( Vector u.vector v )^2 = [(vector u× vector v)×vector v ].vector u = u^2v^2
*Saturday, March 28, 2015 at 1:43am*

**Physics**

A person pushes on a 56-kg refrigerator with a horizontal force of -260 N; the minus sign indicates that the force points in the -x direction. The coefficient of static friction is 0.58. (a) If the refrigerator does not move, what are the magnitude and direction of the static ...
*Friday, March 27, 2015 at 11:58pm*

**Physics**

At the train station, you notice a large horizontal spring at the end of the track where the train comes in. This is a safety device to stop the train so that it will not plow through the station if the engineer misjudges the stopping distance. While waiting, you wonder what ...
*Friday, March 27, 2015 at 6:33pm*

**Algebra 1**

A physics student stands on top of a hill that has an elevation of 56 meters. He throws a rock and it goes up into the air and then falls past him and lands on the ground below. The path of the rock can be modeled by the equation - y=-0.04x^2+1.3x+56 where x is the horizontal ...
*Friday, March 27, 2015 at 6:12pm*

**mathematical physics**

Obtain the temperature distribution u(x,t) in a laterally insulated rod of length L if both ends on the road are kept at 0°c and the initial temperature distribution in the bar is: u(x,0) = 6sin[πx/L]
*Friday, March 27, 2015 at 1:48pm*

**mathematical physics**

Show that : (I) u = e^xsiny is a solution of Laplace's equation. (ii) u= x^2+t^2 is a solution of the wave equation.
*Friday, March 27, 2015 at 1:36pm*

**mathematical physics**

Solve the initial initial value problem d^2x/dt^2+2DX/dt-3x =0, x(2π) = 0, x(2π) = 13
*Friday, March 27, 2015 at 1:31pm*

**PHYSICS**

A swimmer, capable of swimming at a speed of 1.24 m/s in still water (i.e., the swimmer can swim with a speed of 1.24 m/s relative to the water), starts to swim directly across a 2.24-km-wide river. However, the current is 0.553 m/s, and it carries the swimmer downstream. (a) ...
*Friday, March 27, 2015 at 11:00am*

**physics**

A 2.50m -long, 450g rope pulls a 10.0kg block of ice across a horizontal, frictionless surface. The block accelerates at 2.50m/s2 . How much force pulls forward on the rope?
*Friday, March 27, 2015 at 1:14am*

**Physics **

Cart A has a mass of 10kg and is moving towards cart B at a speed of 15 m/s. If cart B is moving towards cart A with a speed of 5 m/s, what mass must Cart B have to stop both carts upon collision?
*Thursday, March 26, 2015 at 9:29pm*

**Physics**

You drop a rock from a 300-meter cliff. How long will it take to reach the ground? Assume it has no significant air resistance
*Thursday, March 26, 2015 at 9:18pm*

**Physics**

If a ball is launched into the air vertically with a velocity of 20 m/sec, how fast will it be moving after two seconds? (The gravity's acceleration is rounded to 10 m/sec/sec.)
*Thursday, March 26, 2015 at 8:49pm*

**PHYSICS HELP **

Suppose the aliens watching the show are on the surface of Mars. Mass of Mars: 6.42 x 10^23 kg Radius of Mars: 3.394 x 10^6 m Calculate; A) the weight of a 40.0 kg alien on Mars B) the weight of 40.0kg alien on earh Earth-sun distance:1.50x10^11m Mars-sun distance: 2.28 x10^11...
*Thursday, March 26, 2015 at 5:27pm*

**physics**

a force of 150N does 3.40kj of work over a displacement of 25.0m. what is the angle between the force vector and the displacement vector?
*Thursday, March 26, 2015 at 5:18pm*

**physics**

You're in an airplane that flies horizontally with speed 830km/h (230m/s ) when an engine falls off. Neglecting air resistance, assume it takes 35s for the engine to hit the ground. Find the height of airplane. Find the horizontal distance that the aircraft engine falls.
*Thursday, March 26, 2015 at 5:04pm*

**Physics**

It took a force of 262. N to pull a crate weighing 765 N across the floor. The work done was 3500. J. How far was the crate moved?
*Thursday, March 26, 2015 at 5:02pm*

**Physics**

An 78.9 kg person carries a 23 N package up a flight of stairs. The vertical height of the stairs is 23.8 m. How much work is done?
*Thursday, March 26, 2015 at 4:35pm*

**physics 2 AP E&M**

What the flux?
*Thursday, March 26, 2015 at 12:58pm*

**Physics**

A 1500kg car is travelling around a large roundabout of radius 40m at a constant speed of 50kmh-1. Calculate the time it takes to go halfway aound the roundabout. Just wondering which equation I should use. Thanks
*Thursday, March 26, 2015 at 8:31am*

**PHYSICS**

A diver leaves a 3-m board on a trajectory that takes her 2.7m above the board and then into the water 2.9m horizontally from the end of the board.At what speed did she leave the board?At what angle did she leave the board?
*Thursday, March 26, 2015 at 7:21am*

**Physics**

A diver leaves a 3-m board on a trajectory that takes her 2.8m above the board and then into the water 2.7m horizontally from the end of the board.At what speed and angle did she leave the board?
*Thursday, March 26, 2015 at 6:53am*

**Physics**

You can run 8.8m/s,20% faster than your brother. How much head start should you give him in order to have a tie race over 110m?please help:(
*Thursday, March 26, 2015 at 6:52am*

**Physics **

The heating element in a George foreman grill is plugged into a 120-V wall socket, and 1 C of charge passes through it every 0.09 s. What is its power output, and what is the electrical energy being converted into?
*Wednesday, March 25, 2015 at 11:36pm*

**physics**

A penny is dropped from the top of a building 310 m high. Ignoring air resistance, if the penny falls straight down, with what speed would it hit the ground?
*Wednesday, March 25, 2015 at 10:57pm*

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