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Recent Homework Questions About Physics
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physics
A 2.00 kg ball is attached to a ceiling by a 1.40 m long string. The height of the room is 3 m. What is the gravitational potential energy of the ball relative to the ceiling? What is the gravitational potential energy of the ball relative to the floor? (c) What is the gravita...
physics
A 3.60 kg ball is dropped from the roof of a building 184.8 m high. While the ball is falling to earth, a horizontal wind exerts a constant force of 12.1 N on the ball. How long does it take to hit the ground? (acceleration of gravity = 9.81 m/s^2)
physics
A barge with mass 1.0×105 kg is proceeding down river at 5.8 m/s in heavy fog when it collides broadside with a barge heading directly across the river (see the figure). The second barge has mass 2.58×105 kg and was moving at 4.2 m/s. Immediately after impact, the...
physics
Upon its return voyage from a space mission, the spacecraft has a velocity of 24000km/h at point A, which is 7000km from the center of the earth. Determine the velocity of the spacecraft when it reaches point B, which is 6500km from the center of the earth. The trajectory betw...
physics
A bullet of mass 8.0 g is fired horizontally into a 2.2 kg wooden block at rest on a horizontal surface. The coefficient of kinetic friction between block and surface is 0.40. The bullet comes to rest in the block, which moves 2.30 m. (a) What is the speed of the block immedia...
physics
Ricardo, mass 88 kg and Carmelita, who is lighter, are enjoying Lake Merced at dusk in a 30 kg canoe. When the canoe is at rest in the placid water, they exchange seats, which are 3.0 m apart and symmetrically located with respect to the center of the canoe. Ricardo notices th...
Physics
If a 40 kg brick and a 400 kg brick each dropped from 1 m above a trampoline, find the lowest position of each brick. Assume the trampoline is a simple spring obeying Hooke's law with a k value of 12 000 N/m. So, I used mg(h+x)=1/2 k x^2 then solved for x in each case. ** ...
college physics
A cook holds a 1.90 kg carton of milk at arm's length. What force B must be exerted by the biceps muscle?
Physics
If a 40 kg brick and a 400 kg brick each dropped from 1 m above a trampoline, find the lowest position of each brick. Assume the trampoline is a simple spring obeying Hooke's law with a k value of 12 000 N/m. So, I used mg(h+x)=1/2 k x^2 then solved for x in each case. and...
physics
a body is slided through an inclined plane frm a building.If angle of slope is 30 degree and the distance covered aslong the slope is 100m find the height of building
physics
what is the physics principle behind fiber optics??
Physics
If a 40 kg brick and a 400 kg brick each dropped from 1 m above a trampoline, find the lowest position of each brick. Assume the trampoline is a simple spring obeying Hooke's law with a k value of 12 000 N/m. I know i must use Fs= kx, but where do I start? Do i find Fg at ...
Physics
This is a four part question, I need help with the fourth part. 1. I found the Gravitational Potential Energy of a gymnast at her maximum height above a trampoline to be 400J. 2. I found the Kinetic Energy of her just before she makes contact with the trampoline to also be 400...
Physics
A rollercoaster car starts at rest on top of a frictionless hill of height 17 m, slides down to ground level, and then into a frictionless loop of radius 5 m. When the car is at the side of the loop (level with the center), find the magnitude of the car's tangential accele...
physics
At what displacement from the equilibrium is the total energy of a simple harmonic oscillator one - sixths KE and five - sixth PE? Answer should be in terms of the amplitude A.
physics
Four identical masses of 2.6 kg each are located at the corners of a square with 1.5 m sides. What is the net force on any one of the masses?
physics
the solid has a mass of 180g. what is the density of the solid?
Physics
In this same series spring system, what is the effective combined spring constant kseries of the two springs? Answer in units of N/cm.
Physics
Now consider the same two springs in series. 6.4 N/cm, 3.6 N/cm 44 N What distance will the spring of constant 3.6 N/cm stretch? Answer in units of cm.
Physics
In the parallel spring system, the springs are positioned so that the 44 N weight stretches each spring equally. The spring con- stant for the left-hand spring is 3.6 N/cm and the spring constant for the righ-hand spring is 6.4 N/cm. How far down will the 44 N weight stretch t...
Physics
Sorry new here trying to figure out angular problem with a disc, only have 2 attempts remaining please help me out :D. When the play button is pressed, a CD accelerates uniformly from rest to 470rev/min in 3.0 revolutions. If the CD has a radius of 6.0 cm and a mass of 15 g , ...
Physics 10th Grade
Hi im kinda confused still on Pulley systems and hoping someone can help me out. The two masses (m1 = 5.5kg and m2 = 3.0kg) in the Atwood's machine shown in The Figureare released from rest, with at a height of 0.89m above the floor. When m1 hits the ground its speed is 1....
Physics Help!
Sorry I've tried 3 different ways to answer this and all have been wrong, please help me out! The moment of inertia of a 1.1 kg bicycle wheel rotating about its center is 0.15 kg*m^2 What is the radius of this wheel, assuming the weight of the spokes can be ignored?
PHysics
A ballplayer standing at home plate hits a baseball that is caught by another player at the same height above the ground from which it is hit. The ball is hit with an initial velocity of 20.6 m/s at an angle of 58.9 degrees above the horizontal. How high will the ball rise?
Physics
Assume you are a medieval knight attacking a castle with a canon. The ball leaves the cannon with a speed of 34.9 m/s. The barrel's angle with respect to the ground is 39.5 deg, and you make a perfect hit on the tyrant's chamber which is at the same level as the cannon...
Physics
If a ball has an initial speed of 26.6 m/s and is launched at an angle of 63.2 degrees above the horizontal, what is the tallest obstacle that the ball can clear?
Physics
A helicopter is flying horizontally at 7.52 m/s and an altitude of 16.6 m when a package of emergency medical supplies is ejected horizontally backward with a speed of 11.9 m/s relative to the helicopter. Ignoring air resistance, what is the horizontal distance between the pac...
Physics
You set up a ramp on your desk at home. Marbles rolling down the ramp and horizontally off your desk consistantly land 52.0 cm from the base of your desk. Your desk is 69.0 cm high. If you pull your desk over to the window of your second story room and "launch" marbl...
Physics
A rock is thrown horizontally from a bridge with a speed of 30.1 m/s. The rock is 29.9 meters above the river at the moment of release. a. Find the horizontal distance to the point of impact from the point of release. b. Find the speed with which the rock strikes the river.
Physics
A stone thrown horizontally from a height of 6.32 m hits the ground at a distance of 14.30 m. Calculate the speed of the stone as it hits the ground. Neglect air resistance.
Physics
A catapult on a cliff launches a large round rock towards a ship on the ocean below. The rock leaves the catapult from a height H of 31.0 m above sea level, directed at an angle q above the horizontal with an unknown speed v0. a. The projectile remains in flight for 6.00 secon...
Physics
A surprising result of wave theory is that the diffraction pattern of a dark screen with a hole cut in it (of arbitrary shape) is identical to the pattern of an object with the same shape as the hole. An application of this principle is that a line mounted on transparent slide...
Physics
Aerial skiing involves speeding down a steep ramp that curves sharply upward at the end to launch the skiers into the air. Once airborne, the skier twists and turns in complex combinations to score points in the competition. Consider an aerial launch ramp that has a final laun...
Physics
Jessica's weight is 540 Newtons. According to the Third Law, if the Earth pulls on Jessica with a force of 540N, then Jessica pulls on the Earth with a force of 540 Newtons that acts in the opposite direction. However, if Jessica stumbles while rollerblading, she wil lfall...
college physics
A 2.0 kg disc rolls without slipping on a horizontal surface, so that its center of mass has a constant linear speed of 6.0 m/s. What is the total kinetic energy of the disc? i know that k= 0.5mv2 + 0.5 I w2 K=1/2 mv2 (1+(I/mr2) but i am still getting he wrong answer because i...
Physics
Microwaves with λ = 1 mm are incident upon a 10 cm slit. At a distance of 1 m from the slit, what is the width of the slit's image? The answer is supposed to be 10 cm. I can't seem to get that though. Can someone explain?
Help Physics 1 question
Period=1.4 seconds gravitational acceleration=9.8 m/s^2 length of string=.4865m angle is 3 degrees acceleration from that angle is=.5129 m/s^2 change in bobs height from release to bottom of arc=.000667m bobs speed at bottom of arc=.1143 m/s so i done all the questions and cal...
physics
A 44.3-cm diameter disk rotates with a constant angular acceleration of 2.3 rad/s2. It starts from rest at t = 0, and a line drawn from the center of the disk to a point P on the rim of the disk makes an angle of 57.3° with the positive x-axis at this time. (a) Find the an...
Physics
Hi, So I have this picture of a ramp with a ball going down. I have figured the average velocity, acceleration, and total distance. Now I have to find out the instantaneous velocity at half the distance? I a not sure how to find the instantaneous velocity, if anyone can help t...
Physics
You want to make an old-fashioned pendulum clock, with a period of exactly 1.4 second(s). Use the Earth's gravitational acceleration g = 9.8 m/s2. a) Ignoring the size of the pendulum bob, from what length wire should you hang your pendulum bob? .4865 m b) If you release t...
physics
What linear speed must a 0.0487-kg hula hoop have if its total kinetic energy is to be 0.179 J? Assume the hoop rolls on the ground without slipping.
Physics
Why is it that when water is in a bucket and spinning around in a circular motion and then upside down the water in the bucket does not move or spill? Am not sure on what terms to use to explain why this happens
physics
A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of 18 m/s. The cliff is 52 m above the water's surface. How long does it take for the stone to fall to the water? With what speed does it strike the water?
Physics
Although it can't sustain its top speed for more than 8.65 sec, the cheetah can run a distance of 274 m during that time. If a cheetah with a mass of 50.0 kg is moving north at its top speed. what is its momentum?
physics
A baseball bat is rotating at 350rpm(revolutions per minute) at contact. What is the angular velocity in radians per second?
physics
If a discus thrower rotates through the last 45 degrees of a turn in .11s and the distance from the axis of rotation to the center of the discus is 1.22m, calculate the average linear velocity of the discus.
physics
If the angular velocity at .19s is 3.2 rad/s at .27s, what is the average angular acceleration over this time interval?
physics
a golf club 1.01 m long completes a downswing in .25s through a range of 180 degrees. Assume a uniform (constant) angular velolcity. What is the linear distance moved by the end of the club?
Spring Physics
A 2.0 kg box rests on a plank that is inclined at an angle of 65° above the horizontal. The upper end of the box is attached to a spring with a force constant of 19 N/m, as shown in Figure 6-32. If the coefficient of static friction between the box and the plank is 0.21, w...
physics universal gravity
find the gravitaional force of the sun that acts on a 50 kg peron standing on earth. mass of the sun = 2E30 kg distance from sun to earth = 1.5E11 m radius of earth = 6.4E6 m
Physics
we must apply a force of magnitude 82.0 N to hold the block stationary at x=-2.0 cm. From that position, we then slowly move the block so that our force does +8.0 J of work on the spring–block system; the block is then again stationary. What are the block's positions...
Physics
If the change in position Dx is related to velocity v (with units of m/s) in the equation Dx = Av, the constant A has which dimension? a. m/s^2 b. m c. s d. m^2 I chose b?
Physics
A 3.0 kg breadbox on a frictionless incline of angle ¥è = 42 ¢ª is connected, by a cord that runs over a pulley, to a light spring of spring constant k = 110 N/m, as shown in the figure. The box is released from rest when the spring is unstretched. Assume ...
college physics
A small mass m slides without friction along the looped apparatus shown in Fig. 6-39. If the object is to remain on the track, even at the top of the circle (whose radius is r), from what minimum height h must it be released? (Answer in terms of r.)
Physics
A student of weight 661 N rides a steadily rotating Ferris wheel (the student sits upright). At the highest point, the magnitude of the normal force FN on the student from the seat is 549 N. (b)What is the magnitude of FN at the lowest point? _________N (c) If the wheel's ...
Physics
fully loaded, slow-moving freight elevator has a cab with a total mass of 1250 kg, which is required to travel upward 58 m in 3.4 min, starting and ending at rest. The elevator's counterweight has a mass of only 1005 kg, and so the elevator motor must help. What average p...
Physics
A coin slides over a frictionless plane and across an xy coordinate system from the origin to a point with xy coordinates (3.0 m, 4.1 m) while a constant force acts on it. The force has magnitude 2.4 N and is directed at a counterclockwise angle of 100° from the positive d...
Physics
The figure below shows a "conical pendulum", in which the bob (the small object at the lower end of the cord) moves in a horizontal circle at constant speed. (The cord sweeps out a cone as the bob rotates.) The bob has a mass of 0.035 kg, the string has length L = 0....
Physics
If a discus thrower rotates through the last 45 degrees of a turn in .11 seconds and the distance from the axis of the rotation to the center of the discus is 1.22 m, what is the average linear velocity of the discus?
physics
A 75 kg box slides down a 25o ramp with an acceleration of 3.6 m/s2. Find the coefficient of kinetic friction between the box and the ramp.
physics
A car has a mass of 1500 kg. What is the direction and magnitude of the force that is required to accelerate the car at 4.5 meters per second squared to the east?
AP Physics
Hi, I have the follwoing physics question to ask, Plesae help with hints. "Two people are standing on a 2.5-m-long platform, one at each end. The platform floats parallel to the ground on a cushion of air, like a hovercraft. One person throws a 5.9-kg ball to the other, w...
physics
A 3.00 kg ball is dropped from the roof of a building 176.4 m high. While the ball is falling to Earth, a horizontal wind exerts a constant force of 12.0 N on it. a.)How far from the building does the ball hit the ground? b.)How long does it take to hit the ground? c.)What is ...
physics
If a car is traveling westward with a constant velocity of 20 m/s, what is the net external force acting on it?
Physics
How do you divide 4.0 V by .041 A? Would the answer be: 97.6
physics
If a car is accelerating downhill under a net force of 3674 N, what force must the brakes exert to cause the car to have a constant velocity?
12th grade Physics
Determine the x and y components if a dog walks to the park that is 24m, 30 degrees northwest. Please help i don't know how to go about solving this problem
physics
A grinding wheel in the shape of a solid disk is 0.200 m in diameter and has a mass of 3.00 kg. The wheel is rotating at 2200 rpm about an axis through its center. (a) what is its kinetic energy? (b) How far would it have to drop in free fall to acquire the same amount of kine...
Physics
A tunnel of length L = 141 m, height H = 6.9 m high, and width 6.0 m (with a flat roof) is to be constructed at distance d = 60 m beneath the ground. The tunnel roof is to be supported entirely by square steel columns, each with a cross-sectional area of 960 cm^2. The mass of ...
physics 20
A speed velocity of a a rocket with a mass of 0.25 kg passes from 15 m/s[up] to 40 m/s[up] in 0.60s. calculate the force of the escaped gasses of the rocket. **** that's what i've done, so far data: m = 0.25kg initial velocity = 15 m/s final velocity = 40 m/s time = 0....
physics 20
A speed velocity of a a rocket with a mass of 0.25 kg passes from 15 m/s[up] to 40 m/s[up] in 0.60s. calculate the force of the escaped gasses of the rocket. **** that's what i've done, so far data: m = 0.25kg initial velocity = 15 m/s final velocity = 40 m/s time = 0....
physics
A sports car of mass 950kg (including the driver) crosses the rounded top of a hill (radius = 95m) at 22m/s. Determine a) the normal force exerted by the road on the car, b) the normal force exerted by the car on the 72kg driver, and c) the car speed at which the normal force ...
physics
a .45kg ball, attached to the end of a horizontal cord, is rotated in a circle of radius 1.3m on a frictionless horizontal surface. if the cord will break when the tension in it exceeds 75 N, what is the maximum speed the ball can have?
physics 20
how do you know when the resultant force is = to 0 ? is it when the object is not in motion?
physics - forces
Calculate the velocity of a satellite moving in a stable circular orbit about the Earth at a height of 2600 km.
Physics
Four 7.5 kg spheres are located at the corners of a square of side 0.74 m. Calculate the magnitude and direction of the gravitational force on one sphere due to the other three.
physics
A metal can containing condensed mushroom soup has a mass of 269 g, a height of 14.7 cm, and a diameter of 6.79 cm. It is placed at rest on its side at the top of a 3.34 m long incline that is at an angle of 22.4o to the horizontal and is then released to roll straight down. A...
PHYSICS
a child sitting 1.10 m from the center of a merry go round moves with a speed of 1.25 m/s. calculate the centripetal acceleration of the child and the net horizontal force exerted on the child (mass = 25 kg).
Physics
A golf club 1.01 m long completes a downswing in 0.25 s through a range of 180°. Assume a uniform (constant) angular velocity, what is the average angular velocity of the club? I don't even know what equation to begin with.
physics
A particle at rest undergoes an acceleration of 2.1 m/s2 to the right and 5 m/s2 up. a) What is its speed after 7.9 s? Answer in units of m/s.
physics
a ball is thrown upward. its initial verticle component of velocity is 10 m/s and its initial horizontal component of velocity is 2 m/s. what is the ball's speed 10 s later?
Physics
A barge with mass 1.7×105 kg is proceeding down river at 6.1 m/s in heavy fog when it collides broadside with a barge heading directly across the river. The second barge has mass 2.83×105 kg and was moving at 4.2 m/s. Immediately after impact, the second barge find...
Physics
Calculate the acceleration due to the rotation of the Earth of a person in a location 26° northern geographical latitude. Use REarth = 3,686 km for the value of the radius of the Earth.
Physics
When a falling meteor is at a distance above the Earth's surface of 2.78 times the Earth's radius, what is its free-fall acceleration caused by the gravitational force exerted on it?
Physics
In order to determine the coefficients of friction between rubber and various surfaces, a student uses a rubber eraser and an incline. In one experiment, the eraser begins to slip down the incline when the angle of inclination is 36.4° and then moves down the incline with ...
physics
two movers have to lift a refrigerator into a truck. one of the movers wants to life the refrigerator vertically, but the other mover wants to roll it up a ramp by applying a force parallel to the ramp. assume the height of the truck is 1.5m, the length of the ramp is 5.0m, an...
physics
how are the colors in a spectrum from an atom different from those in a rainbow? I think it is that the spectrum colors are more distinct and not "fuzzy" like a rainbow but I'm not sure
physics
a child causes a wagon to accelerate by pulling it with a horizontal force. newton's third law says that the wagon exerts an equal and opposite force on the child. how can the wagon accelerate? (hint: draw a free-body diagram for each object.)
Physics
Which of the followning equations shows the relationship between the potential energy and height? Explain how you know. potential energy=m(height)+b potential energy=a(height)^2 +b(height)+c potential energy=a/height
physics
A small 5.00 kg brick is released from rest 3.00 m above a horizontal seesaw on a fulcrum at its center, with a radius of 1.60 m. Find the angular momentum of this brick about a horizontal axis through the fulcrum and perpendicular to the plane of the figure the instant the br...
physicss
How long will it take a 2.30 x 10^3 kg truck to go from 22.2 m/s to a complete stop if acted on by a force of -1.26 x 10^4 N? what would be its stopping distance?
physics
true or false the force of friction acts in the SAME direction as the direction of the sliding object
physics
calculate the force of a 300,00 kg jumbo jet that is accelerating 0.4m/square just before takeoff
physics
calculate the acceleration of a 2000kg single -engine airplane just before takeoff when the thrust of the airplane ia 500N Using the G.U.E.S.S. method
Physics
A cannon fires a shell at an angle of 55.0 above the horizontal. The shell has a mass of 17.5kg, and its initial speed as it leaves the cannon is 289m/s. The cannon is not anchored to the ground. It is mounted on a base -a large block of wood- which is sittin go n a level road...
Physics
Two pucks collide on a level air-hockey table. Puck A has a mass of 0.0250 kg and is moving initially due eastward at a speed of 5.50m/s. Puck B has a mass of 0.0500kg and is initially at rest. Right after collision, puck A is moving in a direction of 65 degrees north of east;...
general physics/rotational motion
Two crates of mass m1 = 16 kg and m2 = 23 kg are connected by a cable that is strung over a pulley of mass mpulley = 22 kg as shown below. There is no friction between crate 1 and the table. m1 is sitting on the table mpulley is at the edge of the table to the right of m1 m2 i...
Physics
A helicopter, starting from rest, accelerates straight up from the roof of a hospital. The lifting force does work in raising the helicopter. An 850-kg helicopter rises from rest to a speed of 6.9 m/s in a time of 3.8 s. During this time it climbs to a height of 9.4 m. What is...
Physics
The voltage across a 10-ohm resistor carrying 3 amps must be?
Physics
A fully loaded, slow-moving freight elevator has a cab with a total mass of 1250 kg, which is required to travel upward 58 m in 3.4 min, starting and ending at rest. The elevator's counterweight has a mass of only 1005 kg, and so the elevator motor must help. What average ...
Physics
A coin slides over a frictionless plane and across an xy coordinate system from the origin to a point with xy coordinates (3.0 m, 4.1 m) while a constant force acts on it. The force has magnitude 2.4 N and is directed at a counterclockwise angle of 100° from the positive d...
physics
If a Saturn V rocket with an Apollo spacecraft attached has a combined mass of 2.6 105 kg and reached a speed of 11.2 km/s, how much kinetic energy would it then have? __________J
physics
In the ideal apparatus m1=2.0 kg. What is m2 if both masses are at rest? How about if both masses are moving at constant velocity?
physics
A metal can containing condensed mushroom soup has a mass of 269 g, a height of 14.7 cm, and a diameter of 6.79 cm. It is placed at rest on its side at the top of a 3.34 m long incline that is at an angle of 22.4 degrees to the horizontal and is then released to roll straight ...
physics
What linear speed must a 0.0495-kg hula hoop have if its total kinetic energy is to be 0.113 J? Assume the hoop rolls on the ground without slipping.
physics
A Ferris wheel with a radius of 9.61 m rotates at a constant rate, completing one revolution every 34.1 s. Calculate the magnitude of a passenger's acceleraton when at the top of the wheel.
physics
When it is 10:00, the hour hand on an analog clock is 300 degrees ahead of the minute hand. How many minutes elapse (to three significant digits) before the minute hand next points in the same direction as the hour hand?
physics
The distance from an observer on the plain to the top of a nearby mountain is 5.3km, and the angle between this line and the horizontal is 8.4 degrees. How tall is the mountain?
PHYsics
the temp of air in a foundry increases when molten metals cool and solidify. Suppose a 45 x 10^6 J of energy is added to the surrounding air by the solidifying metal. The air's temp increases by 55 °C, and the air has a specific heat capacity of 1.0 x 10^3 J/kg x °...
physicss
A 0.190 kg piece of copper is heated and fashioned into a bracelet. The amount of energy transferred as heat to the copper is 6.62 x 10^4 J. If the specific heat of copper is 387 J/kg x °C, what is the change in temp of the copper?
physics
a girl pulls a 12.0 kg wagon along by exerting a force of 15.0 N on the wagons handle, which makes an angle of 20.0 degrees with the horizontal. Friction provides a force of 11.0 N in the opposite direction. How long does it take for the wagon, which is initially at rest, to r...
Physics
Astronauts who spend long periods in outer space could be adversely affected by weightlessness. One way to simulate gravity is to shape the spaceship like a cylindrical shell that rotates, with the astronauts walking on the inside surface. Explain how this simulates gravity. C...
Physics
a projectile is launched with an initial velocity of 60 m/s at an angle of 30 degrees above the horizontal. how far does it travel?
physics
a projectile launched horizontally hits the ground in .6 seconds. if it had been launched with a much lower speed in the same direction, it would have hit the ground in
Physics
A ship is being pushed by the sea currents at 25 km/hr 28 degrees west of south. find the velocity of the ship to the west and to the south
physics
A 11.6 kg weather rocket generates a thrust of 215.0 N. The rocket, pointing upward, is clamped to the top of a vertical spring. The bottom of the spring, whose spring constant is 399.0 N/m, is anchored to the ground. Initially, before the engine is ignited, the rocket sits at...
physics
A new event has been proposed for the Winter Olympics. An athlete will sprint 150.0 m, starting from rest, then leap onto a 20.8 kg bobsled. The person and bobsled will then slide down a 46.0 m long ice-recovered ramp, sloped at á=21.0°, and into a spring with a car...
physics
1.A tall pole and a short pole (both having the same diameter and mass density) are both standing straight up. Both are allowed to tip and fall, starting from rest, at the same time. Which reaches the ground first? 2.When a non-vertical projectile strikes the ground, which par...
Physics
1.A net force that is linearly increasing in time is applied to an object. What is time dependence of the object's kinetic energy? 2.A tire is rolling along a road, without slipping, with a center of mass velocity of v. A piece of tape is attached to the tire. When the tap...
Physics
Is it possible for the frictional force to increase the mechanical energy of a system? If so, give 2 examples with brief explanations. If not, why not?
physics
A ball rolls up a ramp which abruptly ends with the ramp dropping straight down. The ball launches off the end of the ramp while still traveling at an upward trajectory, goes through projectile motion, and returns to the same height as the base of the ramp. Ignoring any slowin...
physics
A horizontal 810-N merry-go-round of radius 1.70 m is started from rest by a constant horizontal force of 55 N applied tangentially to the merry-go-round. Find the kinetic energy of the merry-go-round after 2.0 s. (Assume it is a solid cylinder.)
physics
A ball of mass 0.35 kg is fired with velocity 157 m/s into the barrel of a spring gun of mass 1.8 kg initially at rest on a frictionless surface. The ball sticks in the barrel at the point of maximum compression of the spring. No energy is lost to friction. What fraction of th...
physics
A 80- kg ice hockey player standing on a frictionless sheet of ice throws a 6.2- kg bowling ball horizontally with a speed of 2.1 m/s. With what speed does the hockey player recoil?
physics
Two blocks of masses M and 3M are placed on a horizontal, frictionless surface. A light spring is attached to one of them, and the blocks are pushed together with the spring between them. A cord initially holding the blocks together is burned; after this the block of mass 3M m...
physics
A new event has been proposed for the Winter Olympics. An athlete will sprint 150.0 m, starting from rest, then leap onto a 20.8 kg bobsled. The person and bobsled will then slide down a 46.0 m long ice-recovered ramp, sloped at á=21.0°, and into a spring with a car...
physics
The 60kg collar slides on the curved rod in the vertical plane with negligable friction under the action of constant force F in the cord guided by the small pulley at D. If the collar is released from rest at A, determine the force F which will result in the collar striking th...
physics
A 11.6 kg weather rocket generates a thrust of 215.0 N. The rocket, pointing upward, is clamped to the top of a vertical spring. The bottom of the spring, whose spring constant is 399.0 N/m, is anchored to the ground. Initially, before the engine is ignited, the rocket sits at...
physics
Truck brakes can fail if they get too hot. In some mountainous areas, ramps of loose gravel are constructed to stop runaway trucks that have lost their brakes. The combination of a slight upward slope and a large coefficient of friction in the gravel brings the truck safely to...
physics
A force F applied to an object of mass m1 produces an acceleration of 3.20 m/s2. The same force applied to a second object of mass m2 produces an acceleration of 2.00 m/s2. (a) What is the value of the ratio m1/m2? (b) If m1 and m2 are combined, find their acceleration under t...
physics
A 39.5 N child is in a swing that is attached to ropes 2.01 m long. What is the gravitational potential energy when the child is at the bottom of the circular arc? I thought that you would multiply the force given by 2.01 m, but the answer I calculated was incorrect.
PHYSICS
A 0.445 kg ice puck, moving east with a speed of 2.82 m/s, has a head-on collision with a 0.918 kg puck initially at rest. Assuming a perfectly elastic collision, what will be the speed and direction of each object after the collision? speed of the ice puck ? Direction: west s...
physics
A horizontal spring with spring constant 73.2 N/m is compressed 16.7 cm and used to launch a 2.42 kg box across a frictionless, horizontal surface. After the box travels some distance, the surface becomes rough. The coefficient of kinetic friction of the box on the surface is ...
Physics!
Two identical isolated particles, each of mass 1.55 kg, are separated by a distance of 30.6 cm. What is the magnitude of the gravitational force exerted by one particle on the other? --------------- I solved it as: Fg = G(m^2/r2) = G(m/r)2 = 6.673x10^−11 Nm2/kg2 (1.55 kg...
Physics
8) A man on the moon with a mass of 90 kilograms weighs 146 newtons. The radius of the moon is 1.74 x 106 meters, find the mass of the moon. 7.36 x 10^(28) kg 2.4 x 10^(10) kg 7.36 x 10^(22) kg 1.43 x 10^(4) kg i'm unsure of how to do this as well.
Physics
7) Find the force of gravity between two 74.0 kg physics students that are sitting 0.85 m apart 7579.24 N 5.057 x 10(-7) N None of these choices are correct 9.8 x 10(-7) N I'm unsure of how to begin.
Physics
6)A 700kg car is travelling at a constant velocity of 35m/s when it slams on the brakes and comes to a stop. How far did the car travel during braking if the coefficient of kinetic friction is 0.62 ? (Hint: if the accelerator is no longer being pressed, is there an applied for...
Physics
5) You are pushing a 55 kg refrigerator along at a constant speed of 1.5 m/s using an applied force of 250 N when the floor type changes from tile to carpet. The carpet has a coefficient of static friction of 0.62 and a coefficient of kinetic friction of 0.54. Are you pushing ...
Physics
4) A 1200 kg car is accelerating at 1.6 m/s2. If the coefficient of friction of friction is 0.15, what is the force applied to the car by the engine? here do you use the equation kinetic friction= μk(normal force) and put in 1.6 m/s^2=.15(Fn) is this how you go about it?
physics
3) A satellite is orbiting Earth at a distance of 57 kilometers. The satellite has a mass of 96 kilograms. What is the force between the planet and the satellite? (Hint: Don't forget that the distance between them in the equation represents the distance to the center of th...
Physics
2)Find the force of gravity between a tub of water (751.7 kg) and the Sun. The Sun’s mass is 1.99 x 1030 kg and is 1.50 x 1011 m away. I'm guessing you multiple the sun's mass by 9.8(N/kg) .. then what?
physics
A m = 2.51 kg mass starts from rest and slides a distance d down a frictionless theta = 34.6° incline. While sliding, it comes into contact with an unstressed spring of negligible mass. The mass slides an additional 0.220 m as it is brought momentarily to rest by compressi...
Physics
A 125 kg fullback is running at 5.0 m/s to the east and is stopped in 0.75 s by a head-on tackle by a tackler running due west. a) Calculate the original momentum of the fullback. i did this and got 625 kg- m/s b) Calculate the impulse exerted on the fullback i did this and go...
physics
a butterfly at eye level is 20 cm in front of a plane mirror. you are behind the butterfly, 50 cm from the mirror. what is the distance between your eyes and the image of the buterfly in the mirror?
physics
A 39.5 N child is in a swing that is attached to ropes 2.01 What is the gravitational potential energy when the ropes make a 32.1° angle with the vertical?
physics
an extreme skier starting from rest, coasts down a mountain that makes an angle 25.0¨¬with the horizontal. The coeffiecient of kinetic friction between her skis and the snow is 0.200. She coasts for a distance of 8.4m before coming to the edge of a cliff. Without slowi...
Physics
A 9600 kg boxcar traveling at 17 m/s strikes a second boxcar at rest. The two stick together and move off with a speed of 9.0 m/s. What is the mass of the second car? I know that this is an inelastic collision because the 2 stick together but I need help PLEASE!!
Biotechnology
I need a couple of ideas. For the project we are supposed to test out an idea for biotechnology product that is innovative. However, it's just 2 pages, meaning that we can't "develop" something and thus it can include a lot of assumptions. Our choices include...
physics
A force F = (4.18xi + 3.18yj) N acts on an object as it moves in the x direction from the origin to x = 4.34 m. Calculate the work done on the object by the force.
Physics
A block of mass m1 = 4.80 kg sits on top of a second block of mass m2 = 15.6 kg, which in turn is on a horizontal table. The coefficients of friction between the two blocks are µs = 0.300 and µk = 0.100. The coefficients of friction between the lower block and the ...
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