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March 29, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

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physics
At the local grocery store, you push a 14.0-kg shopping cart. You stop for a moment to add a bag of dog food to your cart. With a force of 12.0N, you now accelerate the cart from rest through a distance of 2.30m in 2.55s. What was the mass of the dog food?
Friday, February 20, 2015 at 5:14pm

Physics
A Ferris wheel 26.0m in diameter rotates once every 19.0s What is the ratio of a person's apparent weight to her real weight at the top and at the bottom? Please help! I know there are other questions similar to this but none of the answers are helping me, they are too ...
Friday, February 20, 2015 at 4:43pm

Physics
A 76.6-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is (a) accelerating upward with an acceleration of 1.94 m/s2, (b) moving upward at a constant speed, and (c) accelerating downward with an acceleration of 1.15 m/s2? I've ...
Friday, February 20, 2015 at 3:51pm

Physics
A 3.7kg block moving at 2.0 m/s toward the west on a frictionless surface has an elastic head-on collision with a second 0.80kg block traveling east at 3.0 m/s.
Friday, February 20, 2015 at 1:21pm

physics 2
to increse intensity o f a wave by a factor of 50, by what factor should the amplitude be increased?
Friday, February 20, 2015 at 1:16pm

Physics
What is the wavelength of visible light emit- ted at 4.2 × 108 MHz?
Friday, February 20, 2015 at 12:31pm

physics
The magnetic field of the Earth is 0.50 x 10-4 T in a certain location. a) What will be in Newtons the force on a completely ionized carbon atom (Z = 6, A = 12) traveling with the solar wind with a velocity of 18.00 x 103 m/s perpendicular to the magnetic field? b) How fast ...
Friday, February 20, 2015 at 11:16am

physics
A steel ball with a mass of 0.65 kg is swinging in a circle with a radius of 1.3 meters at a speed of 17m/s. What is the centripetal force?
Friday, February 20, 2015 at 10:50am

Physics
A baseball is thrown horizontally from a height of 3.6 meters at a speed of 24 m/sec. How far will it travel along the ground?
Friday, February 20, 2015 at 10:33am

physics
A square bar with a mass of 0.830 kg and 19.3cm long (l) rests on two parallel horizontal rails that are 18.0cm apart (d) and 120.0cm long (L) as shown in the figure. (By horizontal it is meant that the rails lie in a plane perpendicular to the local gravitational field.) The ...
Friday, February 20, 2015 at 10:33am

physics
Consider a mass spectrometer like the one shown in the figure. A beam of singly charged positive ions is accelerated from an ion source and injected into a velocity selector with an electric field of E=2700V/m) and magnetic field of B=43.0mT. The ions then enter the deflection...
Friday, February 20, 2015 at 9:56am

physics
An electron is accelerated from rest through 2310V and then enters a region where there is a uniform 1.59-T magnetic field. What is the maximum force on the electron? Answer in units of Newtons.
Friday, February 20, 2015 at 8:03am

physics
A stone projected at angle alpha with plane inclined at angle theta find relation between alpha and theta if stone hit at right angke with the inclined plane?
Friday, February 20, 2015 at 5:29am

physics
A 25,000 kg rocket ship near the surface of the Earth accelerates upwards due to a constant 1.25 MN of thrust from its engine. A simple pendulum on the ship is observed to complete 100 full swings in 75.0 s. What is the length of the string? 1. For a simple pendulum: T = 2&#...
Friday, February 20, 2015 at 3:00am

physics
A bridge of length 22 m and mass 1.5 × 105 kg is supported at each end . A truck of mass 25000 kg is located 17 m from the left support A. Calculate the normal force on the bridge at point B (the right support). The acceleration of gravity is 9.8 m/s 2 .
Friday, February 20, 2015 at 12:57am

PHYSICS
A hypothetical planet has a mass 1.55 times that of Earth, but the same radius. What is g near its surface?
Friday, February 20, 2015 at 12:51am

physics
Problem: A long cylinder of diameter 2a has a charge per unit length, lambda, that is uniformly distributed down a very long wire. The cross section of the cylinder is not uniform, with a small hole drilled into it, which has a center at r = R and a diameter of 2b. Find an ...
Friday, February 20, 2015 at 12:13am

physics
Problem:A long cylinder of diameter 2a has a charge per unit length, lambda, that is uniformly distributed down a very long wire. The cross section of the cylinder is not uniform, with a small hole drilled into it, which has a center at r = R and a diameter of 2b. Find an ...
Friday, February 20, 2015 at 12:09am

Physics Circular Motion
A swing ride at a carnival consists of chairs that are swung in a circle by 13.5-m cables attached to a vertical rotating pole. Suppose the total mass of a chair and its occupant is 170 kg, the angle θ = 53° with the vertical pole. Find the speed of the chair.
Friday, February 20, 2015 at 12:02am

Physics Circular Motion
A 1400 kg car rounds a curve of radius 66 m banked at an angle of 12°. What is the magnitude of the friction force required for the car to travel at 80 km/h?
Friday, February 20, 2015 at 12:01am

Physics Circular Motion
The large blade of a helicopter is rotating in a horizontal circle. The length of the blade is 7.0 m, measured from its tip to the center of the circle. Find the ratio of the centripetal acceleration at the end of the blade to that which exists at a point located 2.7 m from ...
Friday, February 20, 2015 at 12:01am

Physics Circular Motion
A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius (r). A passenger feels the seat of the car pushing upward on her with a force equal to two and a half times her weight as she goes through the dip. If r = 24.0 m, how fast is the ...
Friday, February 20, 2015 at 12:01am

physics
Two horizontal forces, and , are acting on a box, but only is shown in the drawing. can point either to the right or to the left. The box moves only along the x axis. There is no friction between the box and the surface. Suppose that = +8.3 N and the mass of the box is 4.5 kg...
Thursday, February 19, 2015 at 11:06pm

physics
You are a pirate working for Dread Pirate Roberts. You are in charge of a cannon that exerts a force 20000 N on a cannon ball while the ball is in the barrel of the cannon. The length of the cannon barrel is 1.88 m and the cannon is aimed at a 44◦ angle from the ground. ...
Thursday, February 19, 2015 at 9:08pm

physics
what would the pressure be if box was turned so the smallest surface was touching ground. Box dimensions: length 25cm, width 10cm, height 4cm, mass 4kg
Thursday, February 19, 2015 at 9:01pm

Physics
A truck runs into a pile of sand, moving 1.6m as it slows to a stop. The magnitude of the work that the sand does on the truck is 6.0×105J. What is its average force that the sand exerts on the truck?
Thursday, February 19, 2015 at 8:37pm

Calculus Physics
A 1559-kg car moves at 15.0 m/s. What is the magnitude of the horizontal net force needed to bring the car to a halt in a distance of 50.0 m?
Thursday, February 19, 2015 at 8:33pm

Physics
A wheel 32.6 cm in diameter accelerates uniformly from 247 rpm to 378 rpm in 6.54 s. How far will a point on the edge of the wheel have traveled in this time
Thursday, February 19, 2015 at 8:10pm

Physics
A projectile on level ground is launched with a certain speed vi and has a downrange distance of vx what is its new downrange distance if it is launched with a speed of 4vi instead?
Thursday, February 19, 2015 at 7:52pm

physics
You begin pushing the car forward from rest. Assume that your car has a mass of 809 kg. Neglecting friction, how long will it take you to push your car up to a speed of 3.93 m/s on a level surface if you exert a constant force of 218 N on it?
Thursday, February 19, 2015 at 7:30pm

physics
hen a battery is connected to a 100-Ω resistor, the current is 4.00 A. When the same battery is connected to a 449-Ω resistor, the current is 1.09 A. Find the emf supplied by the battery and the internal resistance of the battery. I know that emf is equal to current ...
Thursday, February 19, 2015 at 7:07pm

Calculus Physics
A particle is subject to a time-dependent force: F(t)=5t√. If the particle's mass is 7 kg, what will its velocity be at t=6.7 seconds, assuming its initial velocity at t=0 is equal to 0.
Thursday, February 19, 2015 at 6:58pm

physics
when a battery is connected to a 100-Ω resistor, the current is 4.00 A. When the same battery is connected to a 449-Ω resistor, the current is 1.09 A. Find the emf supplied by the battery and the internal resistance of the battery.
Thursday, February 19, 2015 at 6:56pm

physics
A tire placed on a balancing machine in a service station starts from rest and turns through 4.93 revolutions in 1.47 s before reaching its final angular speed. Calculate its angular acceleration. It must be in units of radians. Please help. I have 20 attempts to do this and I...
Thursday, February 19, 2015 at 6:54pm

physics
A block of wood with a mass of 1300g is sitting on a horizontal tabletop. The coefficient of kinetic friction between the block and table is µk=0.74.A rifle bullet with a mass of 39g is fired horizontally into the block at a sped of 290m/s and stops inside the block. a-...
Thursday, February 19, 2015 at 5:08pm

PHYSICS Electricity
A carbon atom's nucleus and its electrons become separated by 20nm . How much work does it take to separate them in J?I found the magnitude of the force the nucleus feels from the electrons,2.07*10^-11 N but the work? Could ex[lain me please?
Thursday, February 19, 2015 at 2:54pm

physics
The magnetic field of the Earth is 0.60 x 10-4 T in a certain location. a) What will be in Newtons the force on a completely ionized carbon atom (Z = 6, A = 12) traveling with the solar wind with a velocity of 10.50 x 103 m/s perpendicular to the magnetic field? b) How fast ...
Thursday, February 19, 2015 at 1:18pm

Physics
I'm trying to solve a Physics problem. I already got the answer correct but I'm unable to do the uncertainties. Can someone please explain how to do in this case? These are the variables used. g = 9.802 m/s2 +/- 0.0005 m/s2 m2 = 951.0 g +/- 2.3 g θ = 31.90º...
Thursday, February 19, 2015 at 1:02pm

physics
a projectile is thrown from the ground with an initial velocity of 20.0m/s at an angle of 40 degrees above the horizontal, find the maximum height,the time required to reach its maximum height,c) it velocity at the top of the trajectory.d) the range of the projectile,e) the ...
Thursday, February 19, 2015 at 8:57am

Physics
Hi, just need a little help with this physics question please. A cylindrical tank of water is located 68m deep in water. An air lock at the bottome of the tank allows access. The sailor must wait while the air pressure in the lock is increased until it equals the water ...
Thursday, February 19, 2015 at 4:56am

physics
1.A 910 kg racecar starts from rest and reaches a speed of 25.1 m/s in 0.48 s. a)What is the average acceleration of the racecar during this time period? b)What is the magnitude of the net force on the racecar? for a) I know: Mass= 910kg V=25.1m/s T=0.48s and I know to find A...
Thursday, February 19, 2015 at 2:27am

physics
The water storage tank has a diameter of 0.5m and contains 150L of water. You find a small hole rusted in the base, with a diameter of 10mm. what is the velocity of the water flowing out of the hole? So, i feel like I need to somehow use both Bernoullis equation and continuity...
Thursday, February 19, 2015 at 2:26am

physics
The equation given is 2SO2(g)+O2(g)->2SO3(g), and if 224L/h of O2 (at standard temp and pressure) is consumed by the reaction, how much power is produced? I can't go further than P=Work/Time and Work=P times change in V I've tried 224x2-224x3/60^2 but that's not...
Thursday, February 19, 2015 at 2:10am

physics
a ball tossed upward at an initial angle has an initial vertical velocity of 20 m/s and horizontal velocity component at 2m/s. the allocation of the ball is shown at 1 second .sketch the diagram of the motion
Thursday, February 19, 2015 at 2:02am

College Physics
A lab class conducts a 1000 trial scattering probability experiment. Nine (9) target marbles were used on a 45.0 cm wide board. The marble diameter was calculated to be 1.48 cm. How many hits were recorded during the experiment? If the standard value for the marble diameter is...
Thursday, February 19, 2015 at 1:04am

physics
A lab class conducts a 1000 trial scattering probability experiment. Nine (9) target marbles were used on a 45.0 cm wide board. The marble diameter was calculated to be 1.48 cm. How many hits were recorded during the experiment? If the standard value for the marble diameter is...
Thursday, February 19, 2015 at 12:59am

physics
The engine of a racing car of mass m delivers a constant power P at full throttle. Assuming that the friction drag force on the car is proportional to the velocity: Fdrag = -cv where c is a positive constant.What maximum speed can be attained by the car on level ground?
Thursday, February 19, 2015 at 12:31am

physics
The engine of a racing car of mass m delivers a constant power P at full throttle. Assuming that the friction drag force on the car is proportional to the velocity: Fdrag = -cv where c is a positive constant.What maximum speed can be attained by the car on level ground?
Thursday, February 19, 2015 at 12:27am

physics
A football is thrown with an initial upward velocity component of 13.5m/s and a horizontal velocity component of 16.5m/s How much time is required for the football to reach the highest point in its trajectory? How high does it get above the ground?How much time after it is ...
Wednesday, February 18, 2015 at 9:03pm

Physics
A man is on his apartment balcony 25m above ground level. He has a fire hose aimed directly at another man who is a ground level, a horizontal distance of 35m from the apartment block. The man on the balcony opens the nozzle and water travels with a speed of 18m/s. how far ...
Wednesday, February 18, 2015 at 7:47pm

Physics
Stones are thrown horizontally with the same velocity from the tops of two different buildings. One stone lands four times as far from the base of the building from which it was thrown as does the other stone. Find the ratio of the height of the taller building to the height ...
Wednesday, February 18, 2015 at 7:14pm

Physics
You are given two transverse waves on a string: f1(x) and f2(x) moving toward each other. At an initial time, the wave f1(x) (lying between 0 and 5 m) moves to the right at v1 = +1 m/s and f2(x) (lying between 5 and 10 m) is moving to the left at v2 = −1 m/s.
Wednesday, February 18, 2015 at 4:45pm

physics
Three identical charges (q =4.3 µC)lie along a circle of radius 1.9 m at angles of 30°, 150°, and 270°, as shown in the figure below. What is the electric field at the center of the circle? I THOUGHT IT WOULD BE ZERO BUT MY PROF TELLS ME THAT'S WRONG WHY?
Wednesday, February 18, 2015 at 3:43pm

Physics
Leroy, who has a mass of 72 kg, is skateboarding at 5.9 m/s when he smacks into a brick wall and comes to a dead stop in 0.2 s.
Wednesday, February 18, 2015 at 1:59pm

Physics
Before going into orbit, an astronaut has a mass of 55 kg. After some days in orbit, a measurement determines that a force of 110 N causes her to move with an acceleration of 1.90 m/s2. What is her mass now?
Wednesday, February 18, 2015 at 1:59pm

Physics
When you jump vertically 0.86 meters above the ground, what is your acceleration when you reach your highest point?
Wednesday, February 18, 2015 at 1:58pm

physics
a pendulum is 0.75 meters long and has a period of 4.17seconds is this pendulum on the earth moon or mars?
Wednesday, February 18, 2015 at 1:05pm

physics
Paul lifts a sack weighing 245 newtons vertically from the ground and places it on a platform at a height of 0.7 meters. If he takes 10 seconds to do this task, what power has he expended during this time?
Wednesday, February 18, 2015 at 12:19pm

physics
A simple harmonic oscillator executes motion whose amplitude is .20 m and it completes 60 oscillations in 2 minutes Calculate its time period and angular frequency
Wednesday, February 18, 2015 at 11:17am

physics
3 blocks with masses of 1,00; 3,00 & 4,00 are connected with strings.calculate the acceleration of the blocks and the tension in the strings.
Wednesday, February 18, 2015 at 10:45am

Calculus Physics
A particles with mass 3.7 kg moves in the x direction according to the following function: x(t)=−7+4t+3t2−4t3. (the units of each coefficient are meters, and time is measured in seconds). At time t=7.8, what is the net force acting on the particle?
Wednesday, February 18, 2015 at 10:45am

Calculus Physics
A box and one force vector, F1 is shown. F1 = + 10 N. If the mass of the box is 3 kg, what is the magnitude and direction of a force, F2, that would need to be applied if the box was to have an acceleration of + 2 m/s 2 in the horizontal direction. (Indicate direction by ...
Wednesday, February 18, 2015 at 9:23am

physics
a small marble of negligible dimensions and of the mass 1.1kg is placed at a point A of a smooth frictionless circular
Wednesday, February 18, 2015 at 7:25am

Physics
A box slides down a 27.7° ramp with an acceleration of 1.25 m/s². The acceleration of gravity is 9.8 m/s². Determine the coefficient of kinetic friction between the box and the ramp.
Wednesday, February 18, 2015 at 5:43am

Physics
A child is twirling a 0.0120-kg plastic ball on a string in a horizontal circle whose radius is 0.100 m. The ball travels once around the circle in 0.500 s. (a) Determine the centripetal force acting on the ball. (b) If the speed is doubled, does the centripetal force double...
Wednesday, February 18, 2015 at 1:01am

Physics
Suppose you had a circuit with three resistors in series and you measured I=7.0 milliamps; V = 14.7 volts; V1= 3.5 volts and V2 = 1.4 volts. What would be the voltage across the third resistor? What would its resistance be?
Wednesday, February 18, 2015 at 12:28am

physics
A 7.00-kg bowling ball moves at 2.15 m/s. How fast must a 2.40-g Ping-Pong ball move so that the two balls have the same kinetic energy?
Tuesday, February 17, 2015 at 11:12pm

physics
A horizontal force of 150 N is used to push a 45.0-kg packing crate a distance of 5.75 m on a rough horizontal surface. If the crate moves at constant speed, find each of the following. (a) the work done by the 150-N force (b) the coefficient of kinetic friction between the ...
Tuesday, February 17, 2015 at 11:05pm

Physics
Suppose you had a circuit with three resistors in series and you measured I=7.0 milliamps; V = 14.7 volts; V1= 3.5 volts and V2 = 1.4 volts. What would be the voltage across the third resistor? What would its resistance be?
Tuesday, February 17, 2015 at 10:29pm

physics
You are sitting in a car going 20 m/s relative to the ground and decide to throw a ball backwards with a velocity of 4m/s relative to your car. A person in another car behind you sees the ball moving towards him with a velocity of 2.50 m/s relative to his car. What is the ...
Tuesday, February 17, 2015 at 10:10pm

Physics
Two boxes, A and B, are connected to each end of a light vertical rope. A constant upward force 90.0N is applied to box A. Starting from rest, box B descends 11.0m in 3.50s . The tension in the rope connecting the two boxes is 30.0N a) What is the mass of box A? b) What is the...
Tuesday, February 17, 2015 at 9:21pm

Physics 202
A rail gun uses electromagnetic forces to accelerate a projectile to very high velocities. The basic mechanism of acceleration is relatively simple and can be illustrated in the following example. A metal rod of mass 10.0g and electrical resistance 0.100Ω rests on ...
Tuesday, February 17, 2015 at 8:45pm

physics
with what velocity must a ball be thrown in order to achieve the height of 50 ft.? and how long will it stay in the air?
Tuesday, February 17, 2015 at 8:14pm

Physics
Sound of a certain wavelength is coming from within a room and passing through a rectangular door (a "slit"). If the width of the doorway is twice the wavelength of the sound, what is the diffraction angle è of the sound leaving the doorway? Please show me how...
Tuesday, February 17, 2015 at 7:46pm

physics
A fire helicopter carries a 664 kg bucket of water at the end of a 24.9 m long cable. Flying back from a fire at a constant speed of 44.2 m/s, the cable makes an angle of 41.6o with respect to the vertical. Determine the force of air resistance on the bucket.
Tuesday, February 17, 2015 at 7:12pm

physics
Two blocks are connected by a lightweight cord that passes over a frictionless, massless pulley. The bottom block has a mass of 2.00 kg and the top block has mass 0.500 kg. The coefficient of kinetic friction at each sliding surface is equal to 0.10. The two blocks are release...
Tuesday, February 17, 2015 at 6:45pm

physics
43. A block of mass 2.00 kg rests on a ramp tilted at 25.0°. Coefficients of friction for the block/ramp: μs = 0.300, μk = 0.100. A string passing over a high quality pulley connects the block with a bucket as shown below. The bucket contains sand but a hole is ...
Tuesday, February 17, 2015 at 6:44pm

physics
38. A rock of mass 0.400 kg is released from the surface and sinks in the ocean. As the rock descends it is acted upon by three forces: gravity, buoyancy, and drag. The buoyancy is an upward force equal to half its weight. Drag from the water can be modeled by F = kv, where k...
Tuesday, February 17, 2015 at 6:43pm

physics
21. A traffic signal of mass 25.0 kg is suspended by two cables as shown in the diagram below. Solve for the tension in each cable each of the following scenarios: (a) θ1 = θ2 = 20.0°, and (b) θ1 = 20.0°, θ2 = 30.0°.
Tuesday, February 17, 2015 at 6:42pm

Physics
how does the value of V relate to V1 and V2?
Tuesday, February 17, 2015 at 6:08pm

physics
Toby is jogging at a constant speed of 3 m/s along a winding path. He is accelerating even though he is going at a constant speed. how is this possible? please help..
Tuesday, February 17, 2015 at 6:04pm

Physics
A contestant in a winter games event pushes a 59.0 kg block of ice across a frozen lake as shown in the figure below. The coefficient of static friction is 0.1 and the coefficient of kinetic friction is 0.03. The block is being pushed at a direction of 23 degrees below the ...
Tuesday, February 17, 2015 at 5:06pm

physics
A string under a tension of 59.0 N is used to whirl a rock in a horizontal circle of radius 2.55 m at a speed of 20.0 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 on the table is 1.00 m...
Tuesday, February 17, 2015 at 4:04pm

Chemistry and physics
What causes a red glow when the iron and sulphur mixture is heated?
Tuesday, February 17, 2015 at 1:30pm

physics
An object 5 cm high is placed at a distance of 60 cm in front of a concane mirror of focal length10cm .Find the position and size of image
Tuesday, February 17, 2015 at 1:17pm

Physics
suppose you had a circuit with three resistors in series and you measured I=7.0 milliamps; V = 14.7 volts; V1= 3.5 volts and V2 = 1.4 volts. What would be the voltage across the third resistor? What would its resistance be?
Tuesday, February 17, 2015 at 12:48pm

Physics
I'm having trouble finding the speed to the problem. My book isn't helping much either. A golfer hits a shot to a green that is elevated 2.50 m above the point where the ball is struck. The ball leaves the club at a speed of 18.7 m/s at an angle of 51.0˚ above the...
Tuesday, February 17, 2015 at 12:36pm

physics SOS
a 62.8 kg astronaut is floating toawrd the front of her ship at .16 m/s relative to the ship. she wishes to throw away the 2.9 kg book she was carrying. what should the speed of the book be to achive her goal?
Tuesday, February 17, 2015 at 8:57am

physics
An object travels at 5.00 m/s in the +x direction and 4.00 m/s in the +y direction. What is the magnitude of its velocity?
Tuesday, February 17, 2015 at 6:23am

physics
An object has a velocity of 5.00 m/s at an angle of 30.0˚ north of east. If we define east as the +x direction and north as the +y direction, what is the magnitude of vy?
Tuesday, February 17, 2015 at 6:13am

physics
A person walks 4.0 miles east and then makes a 50° turn to the right and walks another 2.0 miles. How far is she from her starting point?
Tuesday, February 17, 2015 at 5:04am

Physics
In a hydroelectric installation, a turbine delivers 1500 hp to a generator, which in turn transfers 80.0% of the mechanical energy out by electrical transmission. Under these conditions, what current does the generator deliver at a terminal potential difference of 1910 V?
Monday, February 16, 2015 at 11:03pm

Physics
A battery has an emf of 15.0 V. The terminal voltage of the battery is 11.2 V when it is delivering 26.0 W of power to an external load resistor R. (a) What is the value of R? (b) What is the internal resistance of the battery?
Monday, February 16, 2015 at 10:30pm

physics
A group of students observes that a wooden block (m = 0.40 kg) on the end of a string with a radius of 0.7 meters makes 5 rotations in 20.7 seconds when twirled.
Monday, February 16, 2015 at 8:36pm

physics
this website sucks--- try posting solutions to the questions that are asked or stop calling your site homework help
Monday, February 16, 2015 at 8:07pm

Physics 2
Using the diagram to the left, rank each of the given paths on the basis of the change in electric potential. Rank the largest-magnitude positive change (increase in electric potential) as largest and the largest-magnitude negative change (decrease in electric potential) as ...
Monday, February 16, 2015 at 7:06pm

Physics
The figure below shows an initially stationary block of mass m on a floor. A force of magnitude F = 0.550mg is then applied at upward angle = 19°. (a) What is the magnitude of the acceleration of the block across the floor if the friction coefficients are μs = 0.595 ...
Monday, February 16, 2015 at 5:28pm

physics
A woman with mass of 63 kg stands at the rim of a horizontal table having a moment of inertia of 520 kg m2 and a radius of 1.5 m. The turntable is initially at rest and is free to rotate about a frictionless, vertical axis through its center. The woman then starts walking ...
Monday, February 16, 2015 at 5:06pm

physics
A charge of +355 μC is fixed at the center of a square that is 0.64 m on a side. How much work is done by the electric force as a charge of +7.9 μC is moved from one corner of the square to any other empty corner?
Monday, February 16, 2015 at 2:38pm

physics
A police officer investigating an accident estimates that a moving car hit a stationary car at 24km/h . If the moving car left skid marks 45m long, and if the coefficient of kinetic friction is 0.71, what was the initial speed of the moving car? Express your answer using two ...
Monday, February 16, 2015 at 2:28pm

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