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November 26, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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physics
A Titan IV rocket has put your spacecraft in a circular orbit around Earth at an altitude of 230 km. Calculate the force due to gravitational attraction between the Earth and the spacecraft in N if the mass of the spacecraft is 2300 kg.
Saturday, October 25, 2014 at 3:58pm

physics
To determine an athlete's body fat, she is weighed first in air and then again while she's completely underwater. It is found that she weighs 690 N when weighed in air and 36.0 N when weighed underwater. What is her average density?
Saturday, October 25, 2014 at 3:34pm

Physics
A 66.0 kg base runner begins his slide into second base when moving at a speed of 4.4 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to friction...
Saturday, October 25, 2014 at 2:56pm

Physics
A 1200 kg car pulls a 510 kg trailer. The car exerts a horizontal force of 4040 N against the ground in order to accelerate. What force does the car exert on the trailer? Assume an effective friction coefficient of 0.160 for the trailer.
Saturday, October 25, 2014 at 12:34pm

Physics
A(n) 160 g block is pushed by an external force against a spring with spring constant of 1260 N/m until the spring is compressed by 11.8 cm from its uncompressed length. The compressed spring and block rests at the bottom of an incline of angle θ = 39.0°. Note that ...
Saturday, October 25, 2014 at 12:19pm

Physics
A block of mass 11.2 kg slides from rest down a frictionless 24.0° incline and is stopped by a strong spring with a spring constant 31.3 kN/m (note the unit). The block slides 8.90 m from the point of release to the point where it comes to rest against the spring. When the...
Saturday, October 25, 2014 at 11:41am

physics
A 20 g fridge magnet is being held onto the fridge by a 0.9 N force. coefficient of kinetic friction is 0.3 . (please include an FBD when giving the solutions) a. calculate the friction acting on the magnet. b. calculate the weight of the magnet c.the acceleration of the ...
Saturday, October 25, 2014 at 11:39am

physics
A 20 g fridge magnet is being held onto the fridge by a 0.9 N force. coefficient of kinetic friction is 0.3 . a. calculate the friction acting on the magnet. b. calculate the weight of the magnet c.the acceleration of the magnet. also, explain the situation, cause i dont get it.
Saturday, October 25, 2014 at 11:38am

physics
a car accidently roll off a cliff. as it leaves the cliff it has a horizontal velocity of 13m/s.it hits the ground 60m from the shoreline. calculate the height of cliff.
Saturday, October 25, 2014 at 10:32am

physics
What is the electric field intensity of a point 15cm from a charge 15microcoulomb
Saturday, October 25, 2014 at 5:41am

Physics
For the remaining parts of this question use the following settings in "Uniform circular motion" mode. The initial angular velocity is 4.1 rad/s and the radius is 4.1 cm. (c) What is the speed of the object at a time t = 3.0 s after the simulation is started?
Saturday, October 25, 2014 at 3:32am

Physics
In the amusement park ride known as Magic Mountain Superman, powerful magnets accelerate a car and its riders from rest to 36.6 m/s in a time of 8.22 s. The mass of the car and riders is 3.94 × 103 kg. Find the average net force exerted on the car and riders by the magnets.
Friday, October 24, 2014 at 11:43pm

Physics
What are the products (either vector or scalar for each answer) of: a) scalar x scalar b) scalar x vector c) vector x vector A simple concept, but I want to be sure I get it right! Thanks for any help :)
Friday, October 24, 2014 at 11:09pm

College physics
When a 0.15 kg baseball is hit, it approaches the bat with a speed of 20 m/s and undergoes an elastic collision. (a) What is the impulse delivered to the bat by the ball? (b) If the baseball is in contact with the bat for 1.3 ms, what is the average force exerted by the bat on...
Friday, October 24, 2014 at 10:30pm

Physics
A mouse sits on a turntable 14.8 cm from the center. The coefficient of static friction is 0.49. The angular velocity increases steadily from zero. At what angular velocity does the mouse begin to slide? I believe that the max frictional force can be is momentum x normal force...
Friday, October 24, 2014 at 9:12pm

physics
Due to friction with the Earth's atmosphere, a large static electric charge could build up on our plummeting asteroid fragment. Would you expect our fragment to generate a magnetic field? Explain why or why not.
Friday, October 24, 2014 at 8:47pm

Physics
In the figure, a 52 kg rock climber is climbing a “chimney” between two rock slabs. The coefficient of static friction between her shoes and the rock is 1.20; between her back and the rock it is 0.707. She has reduced her push against the rock until her back and her ...
Friday, October 24, 2014 at 8:41pm

Physics
A father pulls his son, whose mass is 27.3 kg and who is sitting on a swing with ropes of length 2.85 m, backward until the ropes make an angle of 36.8° with respect to the vertical. He then releases his son from rest. What is the speed of the son at the bottom of the ...
Friday, October 24, 2014 at 8:34pm

Physics!
A spring with a spring constant of 224.3 N/m is compressed by 0.253 m. Then a steel ball bearing of mass 0.0433 kg is put against the end of the spring, and the spring is released. What is the speed of the ball bearing right after it loses contact with the spring? (The ball ...
Friday, October 24, 2014 at 8:25pm

Physics!
A car of mass 1298.7 kg is moving at a speed of 64.0 mph when it misses a curve in the road and hits a bridge piling. If the car comes to rest in 0.234 s, how much average power (in watts) is expended in this interval?
Friday, October 24, 2014 at 8:24pm

Physics
If you are at the top of a toboggan run that is 44.3 m high, how fast will you be going at the bottom, provided you can ignore friction between the sled and the track?
Friday, October 24, 2014 at 8:21pm

Physics
A classmate throws a 1.1-kg book from a height of 1.3 m above the ground straight up into the air. The book reaches a maximum height of 4.0 m above the ground and begins to fall back. Assume that 1.3 m above the ground is the reference level for zero gravitational potential ...
Friday, October 24, 2014 at 8:20pm

Physics
A classmate throws a 1.1-kg book from a height of 1.3 m above the ground straight up into the air. The book reaches a maximum height of 4.0 m above the ground and begins to fall back. Assume that 1.3 m above the ground is the reference level for zero gravitational potential ...
Friday, October 24, 2014 at 8:16pm

physics
why is it that drivers place cement blocks and other heavy items in the trucks of their vehicles? (think of friction and normal force)
Friday, October 24, 2014 at 7:35pm

physics
Calculate the mass of H2O produced by metabolism of 2.6kg of fat, assuming the fat consists entirely of tristearin (C57H110O6), a typical animal fat, and assuming that during metabolism, tristearin reacts with O2 to form only CO2 and H2O.
Friday, October 24, 2014 at 7:28pm

.
Traveling at a speed of 19.5 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.740. What is the speed of the automobile after 1.21 s have elapsed? Ignore the effects of ...
Friday, October 24, 2014 at 5:40pm

Physics
A 2.10 kg frictionless block is attached to an ideal spring with force constant 315N/m . Initially the block has velocity -3.75m/s and displacement 0.270m . Find (a) the amplitude of the motion. (b) the maximum acceleration of the block. (c) the maximum force the spring exerts...
Friday, October 24, 2014 at 4:10pm

physics
To push a 16 kg crate up a frictionless incline, angled at 32° to the horizontal, a worker exerts a force of 108.0 N, parallel to the incline. As the crate slides 1.50 m, how much work is done on the crate by the worker's applied force?
Friday, October 24, 2014 at 2:34pm

Physics
A block of mass m = 800 g is released from rest and slides down a frictionless track of height h = 57.0 cm. At the bottom of the track the block slides freely along a horizontal table until it hits a spring attached to a heavy, immovable wall. The spring compressed by 2.49 cm ...
Friday, October 24, 2014 at 1:51pm

physics
About the years 214-212 BC, the Greek philosopher and scientist Aρχιμηδ ​51;ζ is said to have repelled a Roman attack with a "death-ray" concave mirror, using sunlight to set the approaching fleet on fire. Assume an early ...
Friday, October 24, 2014 at 1:18pm

Physics
As shown in the figure below, a skateboarder starts at point A on the ramp and rises to point B, a maximum height of h = 2.89 m above the top of the ramp. If the amount of work done against friction is insignificant, determine his initial speed at point A.
Friday, October 24, 2014 at 12:04pm

Physics
as you are riding in a 1650-kg car, you approach a hairpin curve in the road whose radius is 50m. the roadbed is banked inward at anangle of 10 degrees. suppose that the road is dry and that the static friction coefficient between the tires and the asphalt road is .6 what is ...
Friday, October 24, 2014 at 3:46am

physics
A small pumpkin of mass 2.22 kg is dropped from rest from a height of 2.87 m. The pumpkin rebounds from the ground to a height of 1.12 m. a. With what speed does the pumpkin hit the ground? b. With what speed does the pumpkin leave the ground? c. What impulse was given to the ...
Friday, October 24, 2014 at 12:05am

physics
A 1075 kg van, stopped at a traffic light, is hit directly in the rear by a 705 kg car traveling with a velocity of +2.06 m/s. Assume that the transmission of the van is in neutral, the brakes are not being applied, and the collision is elastic. What is the final velocity of ...
Thursday, October 23, 2014 at 10:59pm

physics
A ball is projected upward at time t = 0.0 s, from a point on a roof 10 m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is Consider all quantities as positive in the upward direction. At time the velocity of the ball is ...
Thursday, October 23, 2014 at 9:53pm

Simple Physics
Which of the following is most appropriate to follow motion in one dimension? -linear scale -solid coordinates -x-y-z coordinates -graph with x- and y-axes
Thursday, October 23, 2014 at 9:21pm

physics please help
A marathon is and long. Estimate how many strides would be required to run a marathon. Assume a reasonable value for the average number of 3.1 ft/stride.
Thursday, October 23, 2014 at 9:05pm

Physics.
Bob hits a hockey puck with his stick. What forces are acting on the puck DURING THE ACTUAL HIT? a = weight b = friction c = tension d = forward force e = normal force Write down every letter that applies (in order) and without using any commas. my work: aedb
Thursday, October 23, 2014 at 8:43pm

Physics
A baseball (m = 149 g) approaches a bat horizontally at a speed of 42.2 m/s (94 mi/h) and is hit straight back at a speed of 48.1 m/s (108 mi/h). If the ball is in contact with the bat for a time of 1.10 ms, what is the average force exerted on the ball by the bat? Neglect the...
Thursday, October 23, 2014 at 8:41pm

Physics.
A player kicks a football from ground level with an initial velocity of 28.8 m/s and 26 degrees above the horizontal. What is the ball's hang time? ______s What is the ball's maximum hight? ____ i am so confused on what type of equation i use! please help. I thought i ...
Thursday, October 23, 2014 at 8:41pm

Physics.
A toy car runs off the edge of a horizontal table that is 1.21 m high. The car lands 1.39 m away from the edge of the table How fast was the car moving across the table just before it fell? ____m/s MY WORK: h=1/2gt^2 1.21=1/2(9.8)t^2 1.21=4.9t^2 scuare root; .246 but that ...
Thursday, October 23, 2014 at 8:38pm

physics
A person is standing on a spring bathroom scale on the floor of an elevator which is moving up and slowing down at the rate of 1.53 m/s 2 . The acceleration of gravity is 9.8 m/s 2 . If the person’s mass is 83.4 kg, what does the scale read?
Thursday, October 23, 2014 at 8:37pm

physics
Consider a railroad carmoving and striking another car at rest. The two cars then become attached by a special hitch. Does the first car have momentum? and why?
Thursday, October 23, 2014 at 8:34pm

physics
A baseball is thrown at an angle of 20◦ relative to the ground at a speed of 25.6 m/s. The ball is caught 42.9416 m from the thrower. The acceleration due to gravity is 9.81 m/s2 . How long is it in the air?
Thursday, October 23, 2014 at 8:30pm

physics
A 1.0-kg cart and a 0.50-kg cart sit at different positions on a low-friction track. You push on the 1.0-kg cart with a constant 2.5-N force for 0.15m . You then remove your hand, and the cart slides 0.35 m and strikes the 0.50-kg cart. By what amount does your force change ...
Thursday, October 23, 2014 at 7:54pm

Physics
A box slides from rest down a frictionless ramp inclined at 35.0° with respect to the horizontal and is stopped at the bottom of the ramp by a spring with a spring constant of k = 3.50 104 N/m. If the box has a mass of 12.0 kg and slides 3.00 m from the point of release to...
Thursday, October 23, 2014 at 7:46pm

Physics
A massless pan hangs from a spring that is suspended from the ceiling. When empty, the pan is 50 cm below the ceiling. If a 105 g clay ball is placed gently on the pan, the pan hangs 60 cm below the ceiling. Suppose the clay ball is dropped from the ceiling onto an empty pan. ...
Thursday, October 23, 2014 at 7:46pm

Physics
Two massless springs (S1 and S2) are arranged such that one hangs vertically downward and the other is vertically upward, as shown in figure (a). When a 0.275-kg mass is suspended from S1, it stretches by an amount Δx1 = 0.062 m, as shown in figure (b). Spring S1 is now ...
Thursday, October 23, 2014 at 7:45pm

physics
i need help setting up the equation. do i break up the problem into two parts? thanks in advance. A 3 kg block travels along a horizontal surface with a coefficient of kinetic friction of 0.18 at a speed of 7 m/s. After sliding a distance of 1.8 m the block makes a smooth ...
Thursday, October 23, 2014 at 7:11pm

Physics
A car is traveling up a hill that is inclined at an angle θ above the horizontal. Determine the ratio of the magnitude of the normal force to the weight of the car when (a) θ = 18o and (b) θ = 30o.
Thursday, October 23, 2014 at 7:06pm

Physics
A 1410-kg submarine rises straight up towards the surface. Seawater exerts both an upward buoyant force of 16760 N on the submarine, as well as a downward resistive force of 1080 N. What is the submarine's acceleration?
Thursday, October 23, 2014 at 7:05pm

Physics
The helicopter in the drawing is moving horizontally to the right at a constant velocity. The weight of the helicopter is W=54300 N. The lift force L generated by the rotating blade makes an angle of 21.0° with respect to the vertical. (a) What is the magnitude of the lift...
Thursday, October 23, 2014 at 7:01pm

Physics
A ball player hits a home run, and the baseball just clears a wall 20.3 m high located 119.0 m from home plate. The ball is hit an an angle of 35° to the horizontal, and air resistance is negligible. Assume the ball is hit at a height of 1.0 m above the ground. (a) What is...
Thursday, October 23, 2014 at 6:23pm

physics
A long jumper leaves the ground at an angle of 24.4◦to the horizontal an data speed of 9.52m/s.How far does he jump?The acceleration due to gravity is 9.8m. What maximum height does he reach?
Thursday, October 23, 2014 at 4:48pm

Physics
An artillery shell is fired at an angle of 67.4◦ above the horizontal ground with an initial speed of 1560 m/s. The acceleration of gravity is 9.8 m/s2 . Find the total time of flight of the shell, neglecting air resistance. Find its horizontal range, neglecting air ...
Thursday, October 23, 2014 at 4:02pm

Physics
A coil is wrapped with 200 turns of wire on the perimeter of a square frame of sides 20.5 cm. Each turn has the same area, equal to that of the frame, and the total resistance of the coil is 2.01 Ω. A uniform magnetic field is turned on perpendicular to the plane of the ...
Thursday, October 23, 2014 at 4:02pm

physics
A brick is thrown upward from the top of a building at an angle of 33.5◦ above the hori- zontal and with an initial speed of 12.8 m/s. The acceleration of gravity is 9.8 m/s2 . If the brick is in flight for 3.4 s, how tall is the building?
Thursday, October 23, 2014 at 1:37pm

Physics
Two masses, mA = 40.0 kg and mB = 55.0 kg, are connected by a massless cord that passes over a pulley that is free to rotate about a fixed axis. This device is known as an Atwood’s Machine. The pulley is a solid cylinder of radius R = 0.360 m and mass of 7.50 kg. Note: ...
Thursday, October 23, 2014 at 1:26pm

physics
A line directed to the west. A plane flies 20 degrees north of that direction ( 90 degrees north of that direction would be north..) if the plane flies for 340 km, determine its displacement toward the west and its displacement toward the north during its flight?
Thursday, October 23, 2014 at 1:09pm

Physics
A sign hangs supported by a rod and cable. The cable is at a 30 degree angle to the sign and the force on the rod is totally horizontal. If the sign weighs 200N what is the tension on the cable
Thursday, October 23, 2014 at 12:27pm

Physics
A camera falls from a blimp that is 744 m above the ground and rising at a speed of 15.5 m/s. Find the maximum height reached by the camera with respect to the ground. The acceleration of gravity is 9.8 m/s^2. Answer in units of m. PLEASE HELP SOON
Thursday, October 23, 2014 at 11:18am

physics
find by calculation,the resultant two equal forces of 6N each acting at a 4N point at an angle of (a) 60 degree (b)120 degree with each other{hint cos120= -cos60 =1 and half or 1/2 cos 60 =V2
Thursday, October 23, 2014 at 11:10am

physics
find by calculation,the resultant two equal forces of 6N each acting at a 4N point at an angle of (a) 60 degree (b)120 degree with each other{hint cos120= -cos60 =1 and half or 1/2
Thursday, October 23, 2014 at 11:07am

Physics Mechanics
A 2.30 kg block is acted upon by a horizontal force F(x) = 30.0 - 10.0x where the force is measured in Newtons if x is measured in meters. The coefficient of kinetic friction between the block and the flat surface is 0.170. The block is initially at x = 0 m. What distance must...
Thursday, October 23, 2014 at 10:51am

physics
astronauts on a distant planet set up a pendulum length 1.2m. the pendulum executes simple harmonic motion and makes complete vibrations in 280s. what is the magnitude of the acceleration due to gravity of this planet?
Thursday, October 23, 2014 at 3:30am

physics
in preparation in shooting a pinball machine, a spring(k = 675N/m) is compressed by 0.0650m relative to its unstrained lenght.the ball(m = 0.0585kg) is at rest against the spring at point A. when the spring is released ,the ball
Thursday, October 23, 2014 at 3:01am

physics
an object is attached to the lower end of a 100-coil spring hanging from the ceiling.the spring stretches by 0.160m. the spring is then cut into two identical springs of 50 coils each. as the drawing shows, each spring is attached between the cieling and the object by how much...
Thursday, October 23, 2014 at 2:43am

physics
a spring lies on a horizontal table, and the left end of the spring is attached to the wall. the other is connected to a box. the box is pulled to the right, stretching the spring static friction exists between the table and the box
Thursday, October 23, 2014 at 2:27am

physics
the mass of the truckand its contents is 7460kg. find the magnitude of the forces exerted by the ground a) the front wheels b)the rearwheels of the truck.
Thursday, October 23, 2014 at 2:13am

physics
suppose a soccer player boots the ball from a distance 35 m into the goal. find the initial speed of the ball if it just passes over the goal, 2.4 m above the ground, given the initial direction to be 40° above the horizontal
Thursday, October 23, 2014 at 1:59am

Physics
It takes 6.7 J of work to stretch a spring 4.4 cm from its unstressed (relaxed) length. How much work (in J) is needed to compress the spring an additional 3.8 cm? I found the spring potential energy to be 6.7 J, and the spring constant to be 6921.5. I thought that plugging ...
Thursday, October 23, 2014 at 1:09am

physics
a floor polisher has a rotating disk that has a 15cm radius the disk rotates at a constant angular velocity of 1.4rev/s and is covered with a soft material that does the polishing. An operator holds the polisher in place for 45s, in order to beff an especially scuffed area of ...
Wednesday, October 22, 2014 at 11:48pm

physics
the magnitude of a pilot is w. the plane is travelling at 230m/s on a vertical circle of radius 690m. determine the ratio Fn/w. for comparison,note that black out can occur for values fn/w as small as 2 if the pilot is not wearing an anti-G suit
Wednesday, October 22, 2014 at 11:22pm

physics
A rifle with a mass of 12 g, traveling with a speed of 425 m/s strikes a large wooden block, which it penetrates to a depth of 15 cm. determine the magnitude of the retarding force that acts on the bullet.
Wednesday, October 22, 2014 at 11:19pm

physics
a penny is placed at the outer edge of a disk(radius =0.150m) that rotates about its axis perpendicular to the plane of the disk at its center. the period of rotation is 1.80s. find the minimum coefficient friction necessary to allow the penny to rotate along with the disk
Wednesday, October 22, 2014 at 11:05pm

Physics
Vector A= a displacment of 20 m due east Vector B= a displasment of 30 m due north
Wednesday, October 22, 2014 at 10:53pm

physics
The figure shows a bicycle wheel resting against a small step whose height is h = 0.120 m. The weight and radius of the wheel are W = 20.0 N and r = 0.340 m. A horizontal force is applied to the axle of the wheel. As the magnitude of increases, there comes a time when the ...
Wednesday, October 22, 2014 at 10:30pm

physics
The figure shows a person whose weight is W = 670 N doing push-ups. Find the normal force exerted by the floor on (a) each hand and (b) each foot, assuming that the person holds this position.
Wednesday, October 22, 2014 at 10:29pm

physics
The steering wheel of a car has a radius of 0.17 m, and the steering wheel of a truck has a radius of 0.24 m. The same force is applied in the same direction to each steering wheel. What is the ratio of the torque produced by this force in the truck to the torque produced in ...
Wednesday, October 22, 2014 at 10:28pm

physics
Five hockey pucks are sliding across frictionless ice. The drawing shows a top view of the pucks and the three forces that act on each one. The forces can have different magnitudes (F, 2F, or 3F), and can be applied at different points on the puck. Only one of the five pucks ...
Wednesday, October 22, 2014 at 10:28pm

physics
The drawing shows a chain-saw blade. The rotating sprocket tip at the end of the guide bar has a radius of 1.4×10-2 m. The linear speed of a chain link at point A is 3.0 m/s. Find the angular speed of the sprocket tip in rev/s.
Wednesday, October 22, 2014 at 10:27pm

physics
A Ferris wheel rotates at an angular velocity of 0.29 rad/s. Starting from rest, it reaches its operating speed with an average angular acceleration of 0.039 rad/s2. How long does it take the wheel to come up to operating speed?
Wednesday, October 22, 2014 at 10:26pm

physics
A merry-go-round at a playground is a circular platform that is mounted parallel to the ground and can rotate about an axis that is perpendicular to the platform at its center. The angular speed of the merry-go-round is constant, and a child at a distance of 1.4 m from the ...
Wednesday, October 22, 2014 at 10:25pm

Physics
A 1.5 kg otter starts from rest at the top of a muddy incline 80.2 cm long and slides down to the bottom in 0.40 s. What net external force acts on the otter along the incline? Answer in units of N
Wednesday, October 22, 2014 at 10:24pm

physics
A rotating object starts from rest at t = 0 s and has a constant angular acceleration. At a time of t = 7.0 s the object has an angular velocity of ω = 16 rad/s. What is its angular velocity at a time of t = 14 s?
Wednesday, October 22, 2014 at 10:24pm

physics
A meter stick is rotated about the end labeled 0.00 cm, so that the other end of the stick moves through an arc length of 7.40 cm. Through what arc length s does the 25.0-cm mark on the stick move?
Wednesday, October 22, 2014 at 10:23pm

physics
A motorcycle is traveling up one side of a hill and down the other side. The crest of the hill is a circular arc with a radius of 43.0 m. Determine the maximum speed that the cycle can have while moving over the crest without losing contact with the road.
Wednesday, October 22, 2014 at 10:22pm

physics
. A car is safely negotiating an unbanked circular turn at a speed of 19 m/s. The road is dry, and the maximum static frictional force acts on the tires. Suddenly a long wet patch in the road decreases the maximum static frictional force to one third of its dry-road value. If ...
Wednesday, October 22, 2014 at 10:22pm

physics
The blade of a windshield wiper moves through an angle of 90.0° in 0.398 s. The tip of the blade moves on the arc of a circle that has a radius of 0.352 m. What is the magnitude of the centripetal acceleration of the tip of the blade?
Wednesday, October 22, 2014 at 10:21pm

physics
The figure below shows a plot of potential energy U versus position x of a 1.30 kg particle that can travel only along an x axis. (Nonconservative forces are not involved.) In the graphs, the potential energies are U1 = 10 J, U2 = 35 J, and U3 = 50 J.
Wednesday, October 22, 2014 at 9:56pm

Physics
A stone is thrown horizontally at 30.0m/s {\rm m}/{\rm s} from the top of a very tall cliff. Calculate its horizontal position and vertical position at 2 s {\rm s} intervals for the first 10.0s {\rm s} a)Calculate the horizontal x and vertical y positions at time t = 2 s
Wednesday, October 22, 2014 at 9:45pm

physics
a pendilum consists ofa small object hanging from the ceiling at the end of the string of negligible mass. the string has length of 0.7m. with the string hanging vertically,the object is given an initial velocity of 2.0m/s parallel to the ground and swings upwards on a ...
Wednesday, October 22, 2014 at 9:28pm

Physics Help
A toy car in the figure below runs off the edge of a table that is h = 1.175 m high. The car lands d = 0.400 m from the base of the table .How long did it take the car to fall? How fast was the car going on the table?
Wednesday, October 22, 2014 at 8:34pm

physics
A 21.2-kg box rests on a frictionless ramp with a 14.3° slope. The mover pulls on a rope attached to the box to pull it up the incline. If the rope makes an angle of 41.2° with the horizontal, what is the smallest force F the mover will have to exert to move the box up...
Wednesday, October 22, 2014 at 8:21pm

please help physics!!
Two toy ducks attached to each other by a string, are being pulled by a child. The front duck is m1= 5.0 kg and the back duck is m2= 2.0 kg. The happy guy pulls them with a force of 10 N and friction exists. The toys are moving with constant velocity. A) if the coefficient of ...
Wednesday, October 22, 2014 at 8:19pm

Physics
1.A plane traveling at 300.0 km/h attempts to land on a 500 m runway. The plane’s engines and brakes accelerate uniformly at –5.0 m/s2. Will the plane be able to land safely? Show all your work. Include any equations used, the given and unknown. Show all calculations...
Wednesday, October 22, 2014 at 7:53pm

physics
A car traveling due east at 20 m/s reverses its direction over a period of 10 seconds so that it is now traveling due west at 20 m/s. What is the direction of the car’s average acceleration over this period? a- The car’s average acceleration points due west. b- The ...
Wednesday, October 22, 2014 at 7:29pm

Physics
A car moving at some speed hits the brakes and skids to a stop after 11 m on a level road. If the coefficient of friction for the road conditions of wet asphalt is 0.53, what was the car's original speed before braking? I have used multiple modes to find the answer and ...
Wednesday, October 22, 2014 at 7:08pm

PLEASE HELP PHYSICS!
Two toy ducks attached to each other by a string, are being pulled by a child. The front duck is m1= 5.0 kg and the back duck is m2= 2.0 kg. The happy guy pulls them with a force of 10 N and friction exists. The toys are moving with constant velocity. A) if the coefficient of ...
Wednesday, October 22, 2014 at 6:47pm

PHYSICS
I AM SORRY I JUST HAVE ONE OF THE MOST HORRIBLE TEACHERS, AND I AM TEACHING MYSELF FOR I GET NOTHING IN CLASS. On an old-fashioned rotating piano stool, a woman sits holding a pair of dumbbells at a distance of 0.565m from the axis of rotation of the stool. She is given an ...
Wednesday, October 22, 2014 at 6:26pm

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