Tuesday

October 21, 2014

October 21, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**Physics**

In the system shown in the figure, suppose the block has a mass of 2.7kg , the spring has a force constant of 500N/m , and the coefficient of kinetic friction between the block and the floor is 0.18. Find the work done on the block by the spring and by friction as the block is...
*Thursday, October 9, 2014 at 11:07am*

**Physics**

A man drags a 180 lb crate across a floor by pulling on a rope inclined at 20.0 degrees with the horizontal. If the coefficient of static friction is 0.560 , and the coefficient of kinetic friction is 0.350, find the acceleration (in feet/second^2) of the crate at the instant ...
*Thursday, October 9, 2014 at 10:46am*

**physics**

An earthquake wave has a wave length of 523m and travels with a speed of 4.6km through a portiin of Earths crust. a) what is its frequency? b) if it travels into a different portion of Earths crust, where its speed is 7.5km/s,what is its new wavelength?
*Thursday, October 9, 2014 at 10:28am*

**physics**

a man fires a rock of a sling shot upwards. the rock has initial velocity of 15m/s. How long will it take for the rock to reach its highest point??
*Thursday, October 9, 2014 at 10:15am*

**physics**

A car drives at 15 m/s and has an air resistance force of 244 N. What is the air resistance force at 30 m/s?
*Thursday, October 9, 2014 at 10:03am*

**physics **

A particle of mass 10 kg is slowly lifted up to a height of 10 metre then calculate the workdone by external and gravity force ?
*Thursday, October 9, 2014 at 9:59am*

**physics**

2 masses m and 4m are placed at 12meter distance. where a mass of 10 kg can be placed between them so that the net gravitation force on it become zero.
*Thursday, October 9, 2014 at 3:53am*

**physics**

2 masses m and 4m are placed at 12meter distance. where a mass of 10 kg can be placed between them so that the net gravitation force on it become zero.
*Thursday, October 9, 2014 at 3:51am*

**Physics **

A block is released from rest at the top of an inclined plane. The height of the plane is 5.00 m and it makes an angle of 30.0 degrees with the horizontal . The coefficient of kinetic friction between block and surface is 0.200. What is the speed of the block (in m/s) when it ...
*Thursday, October 9, 2014 at 1:00am*

**physics**

The resistance of a coil copper wire at 20 degree celsius is 2.21 ohms. After a current of 10 amperes has been flowing in wire for two hours, the resistance of the coil was found o be 2.59 ohms. What is the temperature rise?
*Thursday, October 9, 2014 at 12:41am*

**Science Physics **

On the surface of the Moon an astronaut has a weight of Fg = 120 N. The radius of the Moon is Rm = 1.74 x 106 m, the gravitational constant is G = 6.67 x 10-11 N m2kg2 and the mass of the Moon is Mm = 7.35 x 1022 kg. Solve numerically for the mass of the astronaut ma in kg
*Thursday, October 9, 2014 at 12:10am*

**Physics**

Salmon often jump waterfalls to reach their breeding grounds. Starting 2.00 m from a waterfall 0.55 m in height, at what minimum speed must a salmon jumping at an angle of 32.0 degrees leave the water to continue up stream? help plz...stuck....thx
*Wednesday, October 8, 2014 at 11:20pm*

**Physics**

A 10 kg box is held 2 meters up a ramp that is inclined at 35 degrees. It is released frpm rest, slides down the ramp and across the floor. the coefficient of friction is 0.15. How far along the floor will the box slide?
*Wednesday, October 8, 2014 at 11:03pm*

**physics**

This question is also frustrating me. I just don't a single clue how to do it. A pilot must fly his plane north with a speed of 550 km/hr. A wind of 138 km/hr is blowing at an angle of 31 degrees N of E . What speed does the plane need to keep the desired ground velocity?
*Wednesday, October 8, 2014 at 11:02pm*

**physics**

A boat must head due north across a river channel that has a current of 9 km/hr towards the west. The boat is capable of traveling at 28 km/hr in still water. If the boat heads into the current to keep its true north course, what will be the resultant velocity of the boat? I&#...
*Wednesday, October 8, 2014 at 11:00pm*

**Physics**

The lion first runs 200 yards at 20 deg. south of west, then 300 yards at 40 deg. west of north, and finally 400 yards at 10 deg east of north at which point it catches up to the deer. How far from the starting point, and in what direction is the point where the lion and the ...
*Wednesday, October 8, 2014 at 10:53pm*

**physics**

A dolphin leaps out of the water at an angle of 24.9 ° above the horizontal. The horizontal component of the dolphin's velocity is 5.05 m/s. Find the magnitude of the vertical component of the velocity.
*Wednesday, October 8, 2014 at 10:29pm*

**physics**

Calculate the distance Michael will travel if he maintain an average speed of 9.4 m/s for 2.2 seconds.
*Wednesday, October 8, 2014 at 10:12pm*

**Physics**

A baseball is hit straight up in the air with an initial velocity of 26.7 m/s. How long in seconds does it stay in the air? (Hint: What is the overall distance of the ball?)
*Wednesday, October 8, 2014 at 10:00pm*

**physics**

Forces of 4.57 N and 4.74 N act at right angles on a reddish-green block of mass 5.76 kg. How much acceleration occurs?
*Wednesday, October 8, 2014 at 9:59pm*

**Physics**

A ship is sailing west at 5km/h relative to land.To people on the ship, a balloon appears to move away horizontally at 10km/h versus east. A)what is the wind velocity relative to land? B)What is the distance travelled by the balloon in 30 min 1)For a person at rest on the ship...
*Wednesday, October 8, 2014 at 9:54pm*

**Physics**

Starting from rest, a speedboat reaches a speed of 2.8 m/s in 2.7 s. What is the boat's speed after an additional 3.7 s has elapsed, assuming the boat's acceleration remains the same?
*Wednesday, October 8, 2014 at 9:51pm*

**physics**

What would be the resultant vector with an angle of 30° with the +x axis and has a y component of 8.9 Newtons?
*Wednesday, October 8, 2014 at 9:40pm*

**physics**

Five identical resistors, each of resistance R, are connected in series to a battery, and a total current of 9.74 A flows in the circuit. i. Now, another resistor of resistance R is added to the circuit, in series with the rest of the resistors. Find the new total current in ...
*Wednesday, October 8, 2014 at 8:34pm*

**Physics**

A rock is thrown downward from an unknown height above the ground with an initial speed of 28 m/s. It strikes the ground 4.4 s later. Determine the initial height of the rock above the ground. The acceleration of gravity is 9.8 m/s 2 . Answer in units of m 014 10.0 points An ...
*Wednesday, October 8, 2014 at 8:21pm*

**physics**

Five identical resistors, each of resistance R, are connected in series to a battery, and a total current of 9.74 A flows in the circuit. i. Now, another resistor of resistance R is added to the circuit, in series with the rest of the resistors. Find the new total current in ...
*Wednesday, October 8, 2014 at 7:55pm*

**physics **

The lion first runs 200 yards at 20 deg. south of west, then 300 yards at 40 deg. west of north, and finally 400 yards at 10 deg east of north at which point it catches up to the deer. How far from the starting point, and in what direction is the point where the lion and the ...
*Wednesday, October 8, 2014 at 7:53pm*

**Physics**

Which of the following processes is used in order to fabricate monocrystalline silicon? Note that more than one correct answer is possible. The Czochralski process Silicon ribbon process The float-zone process The silicon casting process
*Wednesday, October 8, 2014 at 7:23pm*

**physics**

In the figure, a frictionless roller coaster car of mass m = 938 kg tops the first hill with speed v0 = 14.9 m/s at height h = 31.5 m. How much work does the gravitational force do on the car from that point to (a) point A, (b) point B, and (c) point C? If the gravitational ...
*Wednesday, October 8, 2014 at 7:17pm*

**math/physics**

A 75.0-kg paint cart with rubber bumpers is rolling 0.965 m/s to the right and strikes a second cart of mass 85.0 kg moving 1.30 m/s to the left. After the collision, the heavier cart is traveling 0.823 m/s to the right. What is the velocity of the lighter cart after the ...
*Wednesday, October 8, 2014 at 7:11pm*

**Physics**

The width of the space charge region at a p-n junction is reduced by applying a voltage bias over the p-n junction. What is the correct statement on both the bias voltage and the p-n junction? The voltage is a forward bias and the diffusion of the majority charge carriers ...
*Wednesday, October 8, 2014 at 7:04pm*

**math/physics**

A 90.0-g disk traveling 3.00 m/s to the right collides with a 75.0-g disk traveling 8.00 m/s to the left. After the collision, the heavier disk is traveling 7.00 m/s to the left. What is the velocity of the lighter disk after the collision? Do I have this setup right? (90.0*3....
*Wednesday, October 8, 2014 at 6:29pm*

**Physics**

A 6m long uniform ladder which has a mass of 25kg leans with its upper end against a smoorth vertical wall and its lower end on rough horizontal ground. The base of the ladder is 3m from the wall and a man of mass 70kg is two thirds of the way up the ladder. calculate ...
*Wednesday, October 8, 2014 at 4:37pm*

**Physics**

A tennis player can serve the ball of mas 57g at an initial horizontal speed of 55ms^-1 the ball remains in contact with the racket for 0.055s. Calculate the average force exerted on the ball during the serve.
*Wednesday, October 8, 2014 at 4:35pm*

**Physics**

A block of wood of mass 1.2kg initially at rest is free to slide on a horizontal surface. A bullet of mass 100g travelling at a speed of 780ms^-1 is fired horizontally at the block and becomes embedded in it. Calculate the speed the block and bullet move off at immediately ...
*Wednesday, October 8, 2014 at 4:28pm*

**Physics**

Two masses, m1 = 25.0 kg and m2 = 45.0 kg, are attached by a massless rope over a massless pulley. The angle of the frictionless incline is α = 27.00. Assume that m2 starts at rest and falls a vertical distance of 3.00 m. Assume m1 also starts at rest and the rope remains...
*Wednesday, October 8, 2014 at 4:23pm*

**Physics**

A swordfish swims at 2.46km/h.How far has the fish traveled after 2050s?
*Wednesday, October 8, 2014 at 2:05pm*

**Physics**

Assume that the batter did not continue to swing the bat after the collision (no energy was added to the system). How fast was the bat moving after the collision? The ball mass .145kg, the bats mass is 1.1kg. And the balls velocity is 44.7m/s and the bats velocity prior to ...
*Wednesday, October 8, 2014 at 1:13pm*

**Physics 203**

Car 1 has 6 times the mass of car 2, but only 0.4 as much kinetic energy. What is the ratio between the speeds of the two cars (v1/v2)? You must type your answer as a numerical value.
*Wednesday, October 8, 2014 at 12:48pm*

**physics**

A bicyclist is pedaling along a road that is sloped upward with angle theta. At which of these road elevation angles must the bicycle wheels exert the greatest force back on the road to move the bicycle forward at the same constant speed?
*Wednesday, October 8, 2014 at 10:35am*

**Physics(astronomy)**

Radio waves and x-rays are similar in what: a) comparable wavelengths b) cannot compare c)have same photon energies On the test, it said those and I picked a. Is that correct? I am nervous T_T
*Wednesday, October 8, 2014 at 10:24am*

**physics**

A construction worker is carrying a load of 40 kilograms over his head and is walking at a constant velocity. If he travels a distance of 50 meters, how much work is being done?
*Wednesday, October 8, 2014 at 10:20am*

**Physics**

Two small charges with a mass of 1.0 g each are connected by 2.0-cm-long insulating rod of negligible mass. Each ball has the same magnitude of charge of 10 nC, but with opposite sign. The rod is held in a 1.0 × 104 N/C uniform electric field at the angle of 30°, ...
*Wednesday, October 8, 2014 at 8:17am*

**physics**

Suppose that 1100 j of work is done by the force 30 n in moving the suitcase a distance of 50 m. At what angle is the force oriented with respect to the ground?
*Wednesday, October 8, 2014 at 8:05am*

**physics**

The coefficient of static friction between the floor of a truck and a box resting on it is 0.370. The truck is travelling at 80.1 km/h. What is the least distance in which the driver can stop the truck and ensure that the box does not slide?
*Wednesday, October 8, 2014 at 7:58am*

**physics**

A 600-pound boat sits on a ramp inclined at 30 degrees as shown in the attached image. What force is required to keep the boat from rolling down the ramp? Completely lost, never done physics before....
*Wednesday, October 8, 2014 at 6:35am*

**physics**

may be this is simple and obvious question but i am really not getting this.in my physics practicals i was doing potentiometer experiment ,in this i did not understand how jockey completes the circuit.i mean we did not do any connections we were just touching wires with this ...
*Wednesday, October 8, 2014 at 3:12am*

**physics**

In a traction setup for a broken bone, with pulleys and rope available, how might we be able to increase the force along the femur using the same weight?
*Wednesday, October 8, 2014 at 3:08am*

**Physics**

Which method of sliding a block of ice requires less force—(a) pushing or (b) pulling at the same angle above the horizontal?
*Wednesday, October 8, 2014 at 3:07am*

**physics**

The x component of a displacement vector r is −149 m, while its y component is −174 m. (a) Find the magnitude of r. (b) Find the direction of r.
*Tuesday, October 7, 2014 at 10:25pm*

**physics**

A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.80 104 m/s, and the radius of the orbit is 5.20 106 m. A second satellite also has a circular orbit around this same planet. The orbit of this second satellite has a radius of 8.70 106 ...
*Tuesday, October 7, 2014 at 10:23pm*

**physics**

George, a cliff diver, begins running 3.15 m away from the edge of a 33.3 m high cliff, if he accelerate at a constant rate of 0.76 m/s2 until he runs horizontally off the cliff, then how far away from the base will he hit the water? m
*Tuesday, October 7, 2014 at 9:11pm*

**Physics HELP**

Two blocks of masses m1 = 6 kg and m2 = 6 kg are on either side of the wedge shown in the figure above. Find their acceleration and the tension in the rope. Ignore friction and the pulley.
*Tuesday, October 7, 2014 at 8:10pm*

**physics**

A skydiver leaps from a hovering helicopter at 2000 feet. Sketch a small graph showing each of the following from the time she leaves the helicopter until she reaches terminal speed: (a) Force of air resistance. (b) Net force (c) acceleration (d) speed.
*Tuesday, October 7, 2014 at 8:01pm*

**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 after half the time.
*Tuesday, October 7, 2014 at 7:51pm*

**Physics HELP**

Two blocks having mass m1 = 6 kg(m1 on ramp of 30 degrees) and m2 =3 kg are connected by a light rope and slide on a frictionless surface as in the figure below. A force F = 10 N acts on m2 at 20 degrees relative the horizontal. Find the acceleration of the system and the ...
*Tuesday, October 7, 2014 at 7:50pm*

**physics**

an arrow is shot from a crossbow. How long will it take the arrow to accelerate from rest to a speed of 152 m/s if the crossbow can accelerate the arrow at a rate of 1.35 x 10^4
*Tuesday, October 7, 2014 at 7:04pm*

**Physics**

A 25.0-g metal cylinder is placed on a turntable, with its center 70 cm from the turntable's center. The coefficient of static friction between the cylinder and the turntable's surface is μs = 0.71. A thin, massless string of length 70 cm connects the center of ...
*Tuesday, October 7, 2014 at 7:03pm*

**math/physics**

A 0.600-kg ball traveling 4.00 m/s to the right collides with a 1.00-kg ball traveling 5.00 m/s to the left. After the collision, the lighter ball is traveling 7.25 m/s to the left. What is the velocity of the heavier ball after the collision?
*Tuesday, October 7, 2014 at 6:25pm*

**Intro Physics - Newton's third rule**

a piano mover raises a 1000 N piano at a constant speed using a very light rope in a frictionless pulley system. with what force is the mover pulling down on the rope? Show steps please! Thank you!
*Tuesday, October 7, 2014 at 5:45pm*

**physics**

A basketball player is standing on the floor 10.0 m from the basket as in the figure below. The height of the basket is H = 3.05 m, and he shoots the ball at an angle, è = 42.8°, with the horizontal from a height of h = 2.04 m. (a) What is the acceleration of the ...
*Tuesday, October 7, 2014 at 5:11pm*

**Physics**

A stunt pilot is attempting to drop a water balloon from a moving airplane onto a target on the ground. The plane moves at a speed of 82.8 m/s and a 49° above the horizontal when the balloon is released. At the point of release, the plane is at an altitude of 700 m. At the...
*Tuesday, October 7, 2014 at 5:04pm*

**Physics**

A 0.600-kg ball traveling 4.00 m/s to the right collides with a 1.00-kg ball traveling 5.00 m/s to the left. After the collision, the lighter ball is traveling 7.25 m/s to the left. What is the velocity of the heavier ball after the collision?
*Tuesday, October 7, 2014 at 4:50pm*

**Physics: momentum**

While you are standing on a expanse of smooth ice, your friend throws a heavy ball towards you. How can you maximize your speed after your interaction with the ball? a. More information is needed to determine how you should maximize your speed. b. It doesn't matter since ...
*Tuesday, October 7, 2014 at 4:32pm*

**physics**

You attempt to throw the rock across the chasm with a velocity of 35 m/s at and angle of 60 degrees above horizontal. Calculate and label the forward velocity (components) of the rock as it leaves your hand. How long will it take to reach the top of the arc (apogee. How far ...
*Tuesday, October 7, 2014 at 4:31pm*

**Physics-Intro**

A 0.600-kg ball traveling 4.00 m/s to the right collides with a 1.00-kg ball traveling 5.00 m/s to the left. After the collision, the lighter ball is traveling 7.25 m/s to the left. What is the velocity of the heavier ball after the collision?
*Tuesday, October 7, 2014 at 4:21pm*

**Physics-Intro**

A bullet with mass 60.0 g is fired with an initial velocity of 575 m/s from a gun with mass 4.50 kg. What is the speed of the recoil of the gun?
*Tuesday, October 7, 2014 at 3:15pm*

**Physics**

You are the juror of a case involving a drunken driver whose 972 kg sports car ran into a stationary 2094 kg station wagon stopped at a red traffic light. The cars stuck together and slid with locked wheels for 11.0 m before coming to rest. The coefficient of sliding friction ...
*Tuesday, October 7, 2014 at 1:55pm*

**physics**

A circular curve of highway is designed for traffic moving at 93 km/h. Assume the traffic consists of cars without negative lift. (a) If the radius of the curve is 110 m, what is the correct angle of banking of the road? (b) If the curve were not banked, what would be the ...
*Tuesday, October 7, 2014 at 1:44pm*

**Physics**

A 0.339 kg book rests at an angle against one side of a bookshelf. The magnitude and direction of the total force exerted on the book by the left side of the bookshelf are given by: What must the magnitude and direction of the total force exerted on the book by the bottom of ...
*Tuesday, October 7, 2014 at 1:19pm*

**Physics **

I need to determine maximum tension/down force with a pendulum. I need to use the lightest string possible to: -support a 16kg bob, with -a velocity of 4m/s -with a swing radius of 2m -at it's equilibrium (ie 0 degrees) -given standard gravity. using T=m(V^2/r)+(g*cos(x)) ...
*Tuesday, October 7, 2014 at 1:10pm*

**physics**

A 35.9 kg child starting from rest slides down a water slide with a vertical height of 20.3 m. (Neglect friction.)What is the child speed half way down
*Tuesday, October 7, 2014 at 12:03pm*

**Physics Help Fast Please :)**

Question 2.2. A book is given a sudden push to make it slide along a desktop. If the initial speed of the slide is doubled, by what factor is the distance that the book slides changed? (Points : 1) 0.5 0.25 2.0 4.0 Question 3.3. A 720 kg roller-coaster car starts off from ...
*Tuesday, October 7, 2014 at 11:51am*

**physics intro**

A ball of mass 0.50 kg is thrown straight up at 6.0 m/s. (a)What is the initial momentum of the ball? (b) What is the momentum of the ball at its peak? (c)What is the momentum of the ball as it hits the ground
*Tuesday, October 7, 2014 at 11:40am*

**Physics**

Buddy is unloading 7kg cans using a 45 degree downward ramp. The ramp was made slippery by the a detergent spill before. Buddy can push the cans off of his truck with an initial velocity of .2 m/s and it moves as 1.2 m/a by the time it reaches the lowest point on the ramp. The...
*Tuesday, October 7, 2014 at 11:24am*

**physics**

A mass m = 6.0 kg is attached to the lower end of a massless string of length L = 27.0 cm. The upper end of the string is held fixed. Suppose that the mass moves in a circle at constant speed, and that the string makes an angle theta = 28° with the vertical, as shown in ...
*Tuesday, October 7, 2014 at 11:12am*

**Physics**

How much force does it take to stretch a 15-m-long, 1.0 cm -diameter steel cable by 6.0mm ? I know f/a divided by change in length/l knowns are diameter 1.0cm, change in lngth 6.0mm, length 15 m. Convert all to meters.
*Tuesday, October 7, 2014 at 10:41am*

**Physics**

A ball rolling with initial velocity of 40m/s(W) undergoes an acceleration of 5.0m/s^2(N) for a period of 6.0seconds. (A) what is the final velocity of the ball? (B) what is the displacement of the ball in the 6.0 sec
*Tuesday, October 7, 2014 at 10:25am*

**physics**

. The altitude of a plane as it begins to descend is shown by the linear equation a = 22,000 – 800m, where a is the plane’s altitude, in feet, and m is minutes. What is the plane’s altitude when m = 12 ft
*Tuesday, October 7, 2014 at 9:22am*

**Physics**

A ball rolling with initial velocity of 40m/s(W) undergoes an acceleration of 5.0m/s^2(N) for a period of 6.0seconds. (A) what is the final velocity of the ball? (B) what is the displacement of the ball in the 6.0 sec
*Tuesday, October 7, 2014 at 9:07am*

**physics**

A 2.27 kg ball is attached to a ceiling by a 1.26 m long string. The height of the room is 2.57 m. What is the gravitational potential energy of the ball relative to the ceiling?
*Tuesday, October 7, 2014 at 3:04am*

**Physics**

A plane starts from rest at the end of a runway and requires 200.0 km/h for takeoff . If it takes 30.0 a to reach takeoff speed, what acceleration must the plane's engines provide to get off the runway ?
*Tuesday, October 7, 2014 at 2:04am*

**physics**

A force is applied to an initially stationary block of mass 1.75 kg that sits on a horizontal floor as shown. The 53.5 N force is applied at θ = 32° angle. The coefficients of friction between the floor and the block are μs = 0.593 and μk = 0.343. What is ...
*Tuesday, October 7, 2014 at 12:23am*

**Physics**

A pistol is shot upwards at an angle of 37 degrees above horizontal, with an initial velocity of 375m/s. What height does it reach? What is its horizontal range? (I pretty much know what formulas to use, but I'm not quite sure HOW to use them.. Also you should know that ...
*Monday, October 6, 2014 at 11:57pm*

**Physics**

the magnitudes of the acceleration are as follows
*Monday, October 6, 2014 at 11:39pm*

**Physics**

Consider the instantaneous velocity of a body. This velocity is always in the direction of 1. the net force at that instant. 2. the motion at that instant. 3. the least resistance at that instant.
*Monday, October 6, 2014 at 11:30pm*

**Physics**

A record of travel along a straight path is as follows: (a) Start from rest with constant acceleration of 3.07 m/s2 for 16.5 s; (b) Constant velocity of 50.655 m/s for the next 0.767 min; (c) Constant negative acceleration of −9.49 m/s2 for 5.89 s. What was the total ...
*Monday, October 6, 2014 at 10:58pm*

**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*

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