Monday

November 24, 2014

November 24, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**Physics**

A highway curve with a radius of 800 m is banked properly for a car traveling 100 km/h. If a 1620- kg Porshe 928S rounds the curve at 220 km/h, how much sideways force must the tires exert against the road if the car does not skid?
*Monday, October 6, 2014 at 9:28pm*

**Physics **

A refrigeration unit on a job site must be slid into place. If the frictional force of 975 N opposes the motion and two workers apply a total force of 1095 N to the unit, what is the net force on the unit? DO I SUBTRACT THE FORCES?
*Monday, October 6, 2014 at 9:06pm*

**Physics-intro**

A trailer has a mass of 5000 kg. It is pulled by a truck with a force of 8750 N. If the frictional force is 2000 N, what is its acceleration? Would I need to subtract both forces then divide the answer by the mass?
*Monday, October 6, 2014 at 9:01pm*

**College Physics**

Col. John Stapp led the U.S. Air Force Aero Medical Laboratory's research into the effects of higher accelerations. On Stapp's final sled run, the sled reached a speed of 284.4 m/s (632 mi/h) and then stopped with the aid of water brakes in 1.4 s. Stapp was barely ...
*Monday, October 6, 2014 at 8:58pm*

**Physics**

Question Part Points Submissions Used A hockey puck is hit on a frozen lake and starts moving with a speed of 12.90 m/s. Exactly 6.7 s later, its speed is 6.70 m/s. (a) What is the puck's average acceleration? Incorrect: Your answer is incorrect. m/s2 (b) What is the ...
*Monday, October 6, 2014 at 8:52pm*

**physics**

A home run is hit such a way that the baseball just clears a wall 26 m high located 118 m from home plate. The ball is hit at an angle of 37 ◦ to the horizontal, and air resistance is negligible. Assume the ball is hit at a height of 1 m above the ground. What is the ...
*Monday, October 6, 2014 at 8:48pm*

**Physics**

Two blocks of masses m1 = 6 kg and m2 = 6 kg are on either side of the wedge shown in the figure above.(m1 on ramp of 30 degrees and m2 on ramp of 60 degrees) Find their acceleration and the tension in the rope. Ignore friction and the pulley.
*Monday, October 6, 2014 at 8:18pm*

**physics**

A balling ball of mass 70.2 kilogram is attached to the ceiling by a 4.20 meter rope. The ball is pulled to to one side and set to horizontal circular motion with a speed of 3.6 meters per second. The angle between the rope and the vertical axis is 30 degrees when pulled....
*Monday, October 6, 2014 at 6:23pm*

**Physics**

An airplane flies clockwise around an airport control tower at a speed of 190 m/s. If that control tower is 8 km from the airplane at all times, what is the plane’s angular velocity (magnitude and direction)?
*Monday, October 6, 2014 at 6:14pm*

**Physics**

A bicyclist coasts without pedaling down an incline that makes an angle of 4o with the horizontal at a steady speed of 13 m/s. If the mass of the cyclist and the bike combined is 76 kg, use k-work (not Newton’s second law) to estimate the force of friction that must be ...
*Monday, October 6, 2014 at 6:14pm*

**Physics**

A bicyclist climbs a hill 17 m tall and then coasts down the other side without pedaling. If the cyclist’s speed was 2.5 m/s at the top, what is it at the bottom (ignoring friction)?
*Monday, October 6, 2014 at 6:13pm*

**physics**

A red ball is thrown down with an initial speed of 1.4 m/s from a height of 28 meters above the ground. Then, 0.6 seconds after the red ball is thrown, a blue ball is thrown upward with an initial speed of 24.9 m/s, from a height of 0.9 meters above the ground. The force of ...
*Monday, October 6, 2014 at 5:55pm*

**physics**

a locomotive is accelerating at 1.6 meters per second it passes through a 20.1 meter wide crossing in a time of 4.03 seconds after the locomotive leaves the crossing how much time is required until it's speed reaches 5.3 meters per second
*Monday, October 6, 2014 at 5:12pm*

**Physics**

A 6.99-kg block is placed on top of a 12.9-kg block that rests on a frictionless table. The coefficient of static friction between the two blocks is 0.565. What is the maximum horizontal force that can be applied before the 6.99-kg block begins to slip relative to the 12.9-kg ...
*Monday, October 6, 2014 at 3:05pm*

**physics**

A 10,000kg truck traveling 5m/s collides with a 1,500 kg Volkswagen traveling in the opposite direction at 14 m/s after the collision the truck and Volkswagen stick together. A) what is the final speed and direction of the mess immediately after the collision? (don't foget...
*Monday, October 6, 2014 at 2:51pm*

**Physics**

Block B has a mass of 4.2 kg and block A has a mass of 2.6 kg. They are in contact and slide over a frictionless horizontal surface. A force of 11 N acts on B.(force applied on block b then block a , they are beside each other) what is the force on B due to A if the blocks are...
*Monday, October 6, 2014 at 12:31pm*

**Physics**

A particle of mass 2 kg has an initial velocity of (4.5i + 3.5j) m/s. It is acted on by a force (5i -2j) N for 2 s. What is its final velocity?
*Monday, October 6, 2014 at 12:26pm*

**physics**

turtle goes 0.50m/s rabbit goes 3.0m/s^2.. rabbit gives turtle 195 seconds head start. how long will it take for hare to catch turtle? 195*.5=97.5m +amount covered while rabbit is catching up
*Monday, October 6, 2014 at 12:05pm*

**Physics **

During 0.19 s, a wheel rotates through an angle of 2.42 rad as a point on the periphery of the wheel moves with a constant speed of 2.88 m/s. What is the radius of the wheel?
*Monday, October 6, 2014 at 11:19am*

**Physics**

A boat is to be used to cross a river of width w that is flowing with a speed v. The boat travels with a constant speed 2v relative to water. At what angle should the boat be directed in order to arrive at a point directly across from its starting point? (draw a diagram ...
*Monday, October 6, 2014 at 10:23am*

**Physics**

An Airplane leaves point A and attempts to fly due north at a velocity of 200 m/s. There is a crosswind of 25 m/s towards the east. How far off course is the airplane after 1 hour?
*Monday, October 6, 2014 at 12:49am*

**physics**

An automobile with an initial speed of 3.25 m/s accelerates uniformly at the rate of 3.2 m/s 2 . Find the final speed of the car after 4.4 s. Answer in units of m / s
*Sunday, October 5, 2014 at 11:35pm*

**Physics**

A force of 10 N pushing down on a 2m^2 block will produce a pressure of?
*Sunday, October 5, 2014 at 10:26pm*

**Physics**

A basketball is thrown horizontally with an initial speed of 4.70m/s . A straight line drawn from the release point to the landing point makes an angle of 30.0 ∘ with the horizontal. What was the release height?
*Sunday, October 5, 2014 at 10:17pm*

**Physics**

Why is it important to use the maximum force reading from a data collection?
*Sunday, October 5, 2014 at 9:57pm*

**physics**

On the Apollo 14 mission to the moon, astronaut Alan Shepard hit a golf ball with a golf club improvised from a tool. The free-fall acceleration on the moon is 1/6 of its value on earth. Suppose he hit the ball with a speed of 33m/s at an angle 28∘ above the horizontal.
*Sunday, October 5, 2014 at 9:53pm*

**Physics**

In laboratory situations, a projectile’s range can be used to determine its speed. To see how this is done, suppose a ball rolls off a horizontal table and lands 1.2m out from the edge of the table. If the tabletop is 95cm above the floor, I figured out the ball is in the...
*Sunday, October 5, 2014 at 9:53pm*

**physics**

A particle is traveling without friction up and down hills and valleys. If its initial potential energy is 85 J and its initial kinetic energy is 83 J, what is its total energy, E? E: Correct: Your answer is correct. J B. If at a later point its potential energy is 131 J, ...
*Sunday, October 5, 2014 at 9:43pm*

**physics**

a projectile is dropped from the top of a building - it falls 1900 ft prior to reaching the ground. determine the magnitude of the acceleration in ft/second squared to the nearest tenth. Question 1 options:
*Sunday, October 5, 2014 at 9:11pm*

**Physics**

A stunt-motorcyclist wants to jump over a row of cars that is 94 meters long. In order to clear the cars, how fast must he be going when he hits a ramp that is inclined 30 degrees? Work so far: Delta x= 94m Ax= 0 m/s2 Ay=-9.8 m/s2 Trying to find: V initial for x Usually, you ...
*Sunday, October 5, 2014 at 8:22pm*

**Physics**

A bird watcher meanders through the woods, walking 1.10 km due east, 0.624 km due south, and 1.09 km in a direction 18.2 ° north of west. The time required for this trip is 1.046 h. Determine the magnitudes of the bird watcher's (a) displacement and (b) average velocity.
*Sunday, October 5, 2014 at 8:06pm*

**Physics**

During baseball practice, you go up into the bleachers to retrieve a ball. You throw the ball back into the playing field at an angle of 42° above the horizontal, giving it an initial velocity of 15 m/s. If the ball is 5.3 m above the level of the playing field when you ...
*Sunday, October 5, 2014 at 6:33pm*

**Physics, Help!! URGENT!!!**

A sprinter must average 24.0 mi/h to win a 100-m dash in 9.30 s. What is his wavelength at this speed if his mass is 84.5 kg?
*Sunday, October 5, 2014 at 5:31pm*

**Physics**

A block of mass m = 4.30 kg slides along a horizontal table with speed v0 = 8.50 m/s. At x = 0 it hits a spring with spring constant k = 31.00 N/m and it also begins to experience a friction force. The coefficient of friction is given by μ = 0.150. How far has the spring ...
*Sunday, October 5, 2014 at 5:29pm*

**Physics gr. 12**

Rick and Glen are cornered by zombies as they tend to be in each episode. In this particular episode, Glen fires a grappling hook with a rope attached up to the roof of the building they are standing beside. Glen takes a quick look at the bag the rope came in which states a ...
*Sunday, October 5, 2014 at 5:25pm*

**physics**

A cart released from rest at the top of a track 90. cm long takes 4.00 seconds to reach the bottom. determine the velocity as the cart reaches the bottom of the track
*Sunday, October 5, 2014 at 4:48pm*

**Physics**

A particle undergoes three displacements. The first has a magnitude of 15 m and makes an angle of 40 ◦ with the positive x axis. The second has a magnitude of 6.2 m and makes an angle of 158 ◦ with the positive x axis. After the third displacement the particle ...
*Sunday, October 5, 2014 at 4:02pm*

**physics**

A ball on the end of a string is whirled around in a horizontal circle of radius 0.33 m. The plane of the circle is 1.26 m above the ground. The string breaks and the ball lands 2.4 m away from the point on the ground directly beneath the ball’s location when the string ...
*Sunday, October 5, 2014 at 3:54pm*

**Physics**

A child on a sled is initially at rest on an icy horizontal surface. The sled is pushed until it reaches a final velocity of 7.00 m/s in a distance of 11.2 m. The coefficient of friction between the ice and runners of the sled is 0.200, and the weight of the child and the sled...
*Sunday, October 5, 2014 at 3:11pm*

**physics**

An automobile traveling along a straight road increases its speed from 89 ft/s to 104 ft/s in 180 ft. If the acceleration is constant, how much time elapses while the auto moves the 180 ft? Answer in units of s
*Sunday, October 5, 2014 at 2:33pm*

**physics**

A ball on the end of a string is whirled around in a horizontal circle of radius 0.467 m. The plane of the circle is 1.24 m above the ground. The string breaks and the ball lands 2.49 m away from the point on the ground directly beneath the ball’s location when the string...
*Sunday, October 5, 2014 at 2:27pm*

**physics**

A diver achieves a horizontal velocity of 3.76 m/s from a diving platform located 6m above the water. How far from the edge will the diver be when she hits the water?
*Sunday, October 5, 2014 at 2:17pm*

**physics**

When a water gun is fired while being held horizontally at a height of 1.00 m above ground level, the water travels a horizontal distance of 4.80 m. A child, who is holding the same gun in a horizontal position, is also sliding down a 45° incline at a constant speed of 1....
*Sunday, October 5, 2014 at 2:06pm*

**physics**

Two tanks are engaged in a training exercise on level ground. The first tank fires a paint-filled training round with a muzzle speed of 250 m/s at 10.0◦ above the horizontal while advancing toward the second tank with a speed of 15.0 m/s relative to the ground. The ...
*Sunday, October 5, 2014 at 1:54pm*

**Physics help please**

Calculate the allowed wavelengths for the emission of a photon initially in the n=3 state in a hydrogen atom
*Sunday, October 5, 2014 at 1:41pm*

**physics**

Janet Leapverifyar drops from a high dive platform with a horizontal velocity of 2.8 m/s. She lands in the H2O below 2.6 seconds later. a. How high is the platform? b. How far from the base does she land? c. What is her final velocity in the vertical direction?
*Sunday, October 5, 2014 at 1:03pm*

**physics**

a horse is running with an initial velocity of 11m/s and begins to accelerate at -1.81m/s^2. how long does it take for the horse to stop?
*Sunday, October 5, 2014 at 12:41pm*

**physics**

how long will it take the sound of the starting gun to reach the ears of the sprinters if the starter is stationed at the finish line for a 100 meter race? assume that the sound has a speed of about 340m/s.
*Sunday, October 5, 2014 at 12:39pm*

**physics**

Superman throws a boulder of weight 1850N at an adversary on the surface of the earth, where the magnitude of the acceleration due to gravity, g = 9.80m/s2 . What horizontal force must Superman apply to the boulder to give it a horizontal acceleration of 11.6m/s2 ?
*Sunday, October 5, 2014 at 11:56am*

**Physics**

At t=0 a grinding wheel has an angular velocity of 24.0rad/s . It has a constant angular acceleration of 35.0rad/s2 until a circuit breaker trips at time t = 1.90s . From then on, it turns through an angle 436rad as it coasts to a stop at constant angular acceleration. Through...
*Sunday, October 5, 2014 at 9:51am*

**Physics Resistance**

A piece of wire of resistance, R and uniform cross sectional area, A is cut into four equal parts and bundled together to form a thicker wire. The resistance of the bundled wire is: A 16R B 1/4R C 4R D 1/16R It's either 16 or 1/16 im not sureee. So I need help for the ...
*Sunday, October 5, 2014 at 2:09am*

**Physics**

Two sources of equal amplitude undergo interference the energy at maxima is four times that due to either source is this a violation of the principle of conservation of energy. Explain. Can someone help me summarize a good model answer and further explanation of the answer? ...
*Sunday, October 5, 2014 at 12:59am*

**physics**

A truck of mass 8912 kg moving at a speed of 66.7 mph has lost its brakes. Fortunately, the driver finds a runaway lane, a gravel-covered incline that uses friction to stop a truck in such a situation; see the figure. In this case, the incline makes an angle of θ = 36.75&...
*Sunday, October 5, 2014 at 12:17am*

**Physics**

A pilot points his aircraft due easy, while wind blows from the south. If the resultant velocity of the aircraft is 44m/s 22 degrees [n] of [e], at what speed does the wind blow?
*Saturday, October 4, 2014 at 10:04pm*

**Physics**

A freight train has mass of 1.6 x 107 kg. If the locomotive can exert a constant pull of 760000 N, how long does it take to increase the speed of the train from rest to 79 km/h? Answer in units of min.
*Saturday, October 4, 2014 at 10:00pm*

**Physics**

An object that starts from rest completes 7 revs in 3 seconds. What is angular accel. in rad/s2?
*Saturday, October 4, 2014 at 9:30pm*

**Physics**

A 7.80 kg particle starts from rest and moves a distance of 8.90 m in 2.60 s under the action of a single, constant force. Find the magnitude of the force.
*Saturday, October 4, 2014 at 9:13pm*

**physics**

The distance between two telephone poles is 54 m. When a 2.0 kg bird lands on the telephone wire midway between the poles, the wire sags 0.16 m. How much tension in the wire does the bird produce? Ignore the weight of the wire. Answer in units of N.
*Saturday, October 4, 2014 at 9:09pm*

**Physics**

A car drives at 15 m/s and has an air resistance force of 277 N. What is the air resistance force at 30 m/s? A truck drives at 9.7 m/s and has an air resistance force of 380 N. What is the air resistance force at 32 m/s? A 85.0 kg skydiver is falling at a constant speed of 32....
*Saturday, October 4, 2014 at 8:40pm*

**Physics**

An airplane dropping supplies to northern villages that are isolated by severe blizzards and cannot be reached by land vehicles. The airplane is flying at an altitude of 785m and at a constant horizontal velocity of 53.5 m/s. At what horizontal distance before the drop point ...
*Saturday, October 4, 2014 at 5:44pm*

**physics**

You use an inclined plane to move furniture into a truck. You perform 224 kJ of work, but only do 91 kJ of useful work. What is the efficiency of the inclined plane?
*Saturday, October 4, 2014 at 5:26pm*

**physics**

A car of mass 550 kg is moving at a speed of 1.5 m/s. A man pushes the car, increasing the speed to 3.2 m/s. How much work did the man do? A. 3435 J B. 2816 J C. 2197 J D. 4123 J
*Saturday, October 4, 2014 at 5:17pm*

**Physics**

A basketball is thrown at 45° to the horizontal. The hoop is located 6.2 m away horizontally at a height of 1.1 m above the point of release. What is the required initial speed? I know that I need to use d = vit + (0.5)at^2, but I then get stuck. Thanks!
*Saturday, October 4, 2014 at 5:08pm*

**Physics**

What should the theoretical maximum value of the uniform acceleration of a object freely rolling down an inclined plane and what would the angle of elevation be?
*Saturday, October 4, 2014 at 4:29pm*

**Physics**

A 55-kg block, starting from rest, is pushed a distance of 5.0m across a floor by a horizontal force Fp whose magnitude is 140N. Fp is parallel to the displacement of the block. The final speed of the block is 2.35m/s. a. How much work was converted to thermal energy? What ...
*Saturday, October 4, 2014 at 8:46am*

**physics**

Find the magnitude of -A+B(vectors),where A(vector) = (31.3, 63.9) B(vector) =(88.5, -142.0)
*Saturday, October 4, 2014 at 8:18am*

**physics**

is sky diving free fall?i mean free fall is when the only force acting is gravitational force but in sky diving drag force also present? so how sky diving can be considered as free fall?
*Saturday, October 4, 2014 at 5:56am*

**physics**

In free fall ,atmospheric pressure is also not present?i mean pressure is force per unit area ,so atmospheric pressure comprises force but? in free fall there should be only gravitational force so atmospheric pressure is not present in free fall?
*Saturday, October 4, 2014 at 5:55am*

**physics**

Why in free fall condition the length of water column in capillary tube is equal to length of tube?h=2Tcos theta /drg where h is rise in? height ,T=SURFACE TENSION d=-DENSITY r=RADIUS OF TUBE AND g=ACCELERATION DUE TO GRAVITY explain from this formula how rise in height equal ...
*Saturday, October 4, 2014 at 5:54am*

**physics**

A 74.0kg person is put on an exercise program by a physical therapist, the goal being to burn up 550 food calories in each daily session. Recall that human muscles are about 21.0% in converting the energy they use up into mechanical energy. The exercise program consists of a ...
*Saturday, October 4, 2014 at 5:06am*

**physics**

You overindulged on a delicious dessert, so you plan to work off the extra calories at the gym. To accomplish this, you decide to do a series of arm raises holding a 5.5kg weight in one hand. The distance from your elbow to the weight is 36cm , and in each arm raise you start ...
*Saturday, October 4, 2014 at 5:05am*

**AS Physics**

A driver leaves his car without applying the hand brakes on a road inclined at an angle of 25 degrees. The car starts to roll down the road with the driver chasing from behind after moving a distance of 20 m the speed of the car is 5.0 ms-1. Calculate the coefficient of static...
*Saturday, October 4, 2014 at 3:01am*

**physics**

a projectile thrown at an angle Ө with the horizontal has horizontal range R and maximum height h. show that the tangent of the angle of projection is given by 4h/R
*Saturday, October 4, 2014 at 2:41am*

**Physics**

A monkey throws a banana horizontally from the top of a tree. The banana hits the ground 3.03 seconds later and lands d = 30.9 meters from the base of the tree. 1. What was the resultant velocity of the banana as it hit the ground? magnitude = ? m/sec. 2. What is the angle ?&...
*Friday, October 3, 2014 at 10:52pm*

**Physics**

You kick a ball off the ground with a horizontal speed of 16 m/sec and a vertical speed of 20.7 m/sec. 1. The ball reaches it's highest point how many seconds after it is kicked. 2. It reaches the ground how many seconds after it is kicked.
*Friday, October 3, 2014 at 10:48pm*

**physics**

A stunt car driver drives off an h = 6.7 m-high cliff into a lake with a horizontal speed of 14 m/s. The car needs to clear an 8.0 m-long ledge that is 5.0 m below the edge of the cliff. The car successfully misses the ledge on the way down. With what speed does the car hit ...
*Friday, October 3, 2014 at 10:11pm*

**Physics**

What is the magnitude of the average force required to stop an 1400kg car in 9.0s if the car is traveling at 85km/h ?
*Friday, October 3, 2014 at 9:41pm*

**Physics**

A 61.5-Ω resistor is connected in parallel with a 146.6-Ω resistor. This parallel group is connected in series with a 16.0-Ω resistor. The total combination is connected across a 13.6-V battery. Find (a) the current and (b) the power dissipated in the 146.6-&#...
*Friday, October 3, 2014 at 8:15pm*

**Physics**

A 4.55 kg steel ball is dropped onto a copper plate from a height of 10.0 m. If the ball leaves a dent 2.80 mm deep in the plate, what is the average force exerted by the plate on the ball during the impact?
*Friday, October 3, 2014 at 8:14pm*

**Physics**

A car is driving on a level highway. It is acted upon by the following forces: a downward gravitational force of 12 kN, an upward contact force due to the road of 12 kN, another contact force due to the road of 7 kN directed West, and a drag force due to air resistance of 5 kN...
*Friday, October 3, 2014 at 7:20pm*

**physics**

A ball is attached to a paddle by a rubber band. The ball is initially moving away from the paddle with a speed of 4.4 m/s. After 0.33 seconds it is moving towards the paddle with a velocity of 2.8 m/s. What is the average acceleration in m/s2 during this time?
*Friday, October 3, 2014 at 6:20pm*

**Physics **

A block of mass 50 kg is pulled on a frictionless floor by F=210N directed to 30angle horizontally, If the block moves 3m, find work done? a. 115 √2J b. 315 √3J Answer is B 315 √3J , my question is how to solve it in this way i mean, i solved it like this, w=...
*Friday, October 3, 2014 at 6:14pm*

**Physics**

A golf ball is shot from a tee, elevated 20m above the green, with an initial speed of 27m/s at an angle of 50° above horizontal. a) What will be the speed of the golf ball before it hits the green, 20m below it started? b) How much time will it take for the ball to travel...
*Friday, October 3, 2014 at 5:27pm*

**Physics **

The drawing below shows a person who, starting from rest at the top of a cliff, swings down at the end of a rope, releases it, and falls into the water below. There are two paths by which the person can enter the water. Suppose he enters the water at a speed of 18.5 m/s via ...
*Friday, October 3, 2014 at 5:13pm*

**Physics**

The height of the sun from point A is larger than from point B by 4.92 degree.If the distance between A and B is 500 Km, How long is the circumference of the earth? ( assume that earth is perfect sphere)
*Friday, October 3, 2014 at 4:39pm*

**Physics **

A 7300-kg satellite has an elliptical orbit, as in the figure. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the perigee and is at the far ...
*Friday, October 3, 2014 at 4:20pm*

**physics**

Three forces act on a moving object. One force has a magnitude of 62.6 N and is directed due north. Another has a magnitude of 45.9 N and is directed due west. What must be (a) the magnitude and (b) the direction of the third force, such that the object continues to move with ...
*Friday, October 3, 2014 at 3:40pm*

**PHYSICS**

Starting from rest, a 2.0 10-4-kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.36 N on it. This force does +2.5 10-4 J of work on the flea. -How far does the flea move while it's pushing off?
*Friday, October 3, 2014 at 3:40pm*

**Physics**

A 55-kg soccer player jumps vertically upwards and heads the 0.45-kg ball as it is descending vertically with a speed of 29 m/s. If the ball is in contact with the player's head for 16 ms, what is the average acceleration of the ball? (Note that the force of gravity may be...
*Friday, October 3, 2014 at 3:28pm*

**PHYSICS**

A golf club strikes a 0.041-kg golf ball in order to launch it from the tee. For simplicity, assume that the average net force applied to the ball acts parallel to the ball's motion, has a magnitude of 6400 N, and is in contact with the ball for a distance of 0.012 m. With...
*Friday, October 3, 2014 at 3:08pm*

**Physics**

Two satellites, A and B, are in different circular orbits about the earth. The orbital speed of satellite A is eighty-two times that of satellite B. Find the ratio (TA/TB) of the periods of the satellites.
*Friday, October 3, 2014 at 3:00pm*

**Physics**

The drawing below shows a person who, starting from rest at the top of a cliff, swings down at the end of a rope, releases it, and falls into the water below. There are two paths by which the person can enter the water. Suppose he enters the water at a speed of 18.5 m/s via ...
*Friday, October 3, 2014 at 2:48pm*

**Physics**

A 36-kg girl is bouncing on a trampoline. During a certain interval after she leaves the surface of the trampoline, her kinetic energy decreases to 185 J from 460 J. How high does she rise during this interval? Neglect air resistance.
*Friday, October 3, 2014 at 2:26pm*

**Physics**

A person pushes a 16.0-kg shopping cart at a constant velocity for a distance of 18.0 m. She pushes in a direction 20.0° below the horizontal. A 40.0-N frictional force opposes the motion of the cart. (a) What is the magnitude of the force that the shopper exerts? (b) ...
*Friday, October 3, 2014 at 2:14pm*

**Physics**

A 7300-kg satellite has an elliptical orbit, as in the figure. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the perigee and is at the far ...
*Friday, October 3, 2014 at 2:05pm*

**physics**

A basketball player makes a jump shot. The 0.600-kg ball is released at a height of 2.13 m above the floor with a speed of 7.55 m/s. The ball goes through the net 3.10 m above the floor at a speed of 3.95 m/s. What is the work done on the ball by air resistance, a ...
*Friday, October 3, 2014 at 2:01pm*

**Physics**

A golf club strikes a 0.041-kg golf ball in order to launch it from the tee. For simplicity, assume that the average net force applied to the ball acts parallel to the ball's motion, has a magnitude of 6400 N, and is in contact with the ball for a distance of 0.012 m. With...
*Friday, October 3, 2014 at 12:42pm*

**Physics**

Suppose in the figure blow that +1.00 103 J of work is done by the force F with arrow (magnitude = 30.0 N) in moving the suitcase a distance of 51.0 m. At what angle θ, counterclockwise from the x-axis, is the force oriented with respect to the ground?
*Friday, October 3, 2014 at 12:38pm*

**Physics**

Two satellites, A and B, are in different circular orbits about the earth. The orbital speed of satellite A is eighty-two times that of satellite B. Find the ratio (TA/TB) of the periods of the satellites.
*Friday, October 3, 2014 at 12:36pm*

**urgent physics ?**

I have drawn my force body diagrams, but I need help making forming the equation for this problem. Any assistance is greatly appreciated! A 60 kg block slides along the top of a 100 kg block. The lighter block has an acceleration of 3.8 m/s2 when a horizontal force F= 390 N is...
*Friday, October 3, 2014 at 12:11pm*

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