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A skier slides horizontally along the snow for a distance of 25 m before coming to rest. The coefficient of kinetic friction between the skier and the snow is µk = 0.040. Initially, how fast w
In being launched from rest it moves through a distance of 87 m and has a kinetic energy of 5.40 x 107 J at lift-off. What is the work done on the jet by the catapult?
In an ionic solution, 5.8 x 1015 positive ions with charge +2e pass to the right each second while 6.3 x 1015 negative ions with charge -e pass to the left. What are the magnitude and direction of cur
A person pulls a toboggan for a distance of 20.0 m along the snow with a rope directed 30.0° above the snow. The tension in the rope is 95.0 N. (a) How much work is done on the toboggan by the t
Suppose we create a magnetic field that produces an upward force on the wire exactly equal in magnitude to the wire's weight, causing the wire to "levitate". What are the field's direction and magni
The ions will separate until they make an electric field that exactly balances the magnetic force. This electric field produces a voltage that can be measured. a. What force is felt by a singly ioni
A student using a resonance tube determines the three resonances occus at distances of l1= 0.172m, l2=0.529m, l3=0.884m below the open end of the tube. The frequency of the tuning fork used is 480 H
A solenoid that is 91.4 cm long has a cross-sectional area of 15.0 cm2. There are 1000 turns of wire carrying a current of 6.74 A. (a) Calculate the energy density of the magnetic field inside the s
Find the tangential and centripetal acceleration at the top of the loop using the velocity from part A.
A spherical "hollow" is inside a sphere of radius, R, and mass, M. The surface of the hollow touches the right side of the large sphere and also passes through it's center.
A spring with a mass on the end of it hangs in equilibrium a distance of 0.420 m above the floor. The mass is pulled down a distance 0.060 m below the original position, released, and allowed to osc
A spring has a spring constant k 1/4 8.75 N/m. If the spring is displaced 0.150 m from its equilibrium position, what is the force that the spring exerts? Show your work.
A 50g ball travelling at 25 m/s is bounced off a brick wall and rebounds at 22 m/s. If the ball is in contact with the wall for 3.5 ms, what is the average acceleration of the ball during this time
A ball is launched into the air at an angle of 60° above the horizontal with a speed of 21.0 m/s. (a) What are the x- and y- components of the velocity of the ball 3.20s after it leaves the cann
A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.30 m/s at an angle of 23.0° below the horizontal. It strikes the ground 3.00 s later. Find t
A 45.0-kg crate is dragged at constant velocity 8.20-m across a horizontal floor with a rope making a 30 degree angle above the horizontal. The coefficient of kinetic friction is 0.250. Find the wor
Suppose W is the energy transferred stretchinig a spring from 0 to 0.10 m. The amount of work done stretching the same spring from 0.10 m to 0.20 m is:
What is the change in voltage of a test charge in going from negatively charged plate to the positively charged plate while the dielectric is between the two plates?
How much work does he do during a 100 km race in which his average speed is 12.0 m/s? Often, the work done is expressed in nutritional Calories rather than in joules. Express the work done in part (
An airplane has an effective wing surface area of 116 m2 that is generating the lifting force. In level flight the air speed over the top of the wings is 62.0 m/s, while the air speed beneath the wi
At one instant of time the first particle with a charge of -2.50 µC is located at x = 0 and y = +8.70 cm, and the second particle with a charge of 7.80 µC is located at x = 0 and y = -8
(a) over what period of time did the flux increase? (b) If the current had been only 20A, how long would the flux increase have taken?
A fisherman notices that wave crests pass the bow of his anchored boat every 4.0 seconds. He measures the distance between two crests to be 5.5m. How fast are the waves traveling?
A radio controlled car transmitter produces a 240 milliWatt signal. The car will work if the received signal is at least 20 microWatts/meter^2. Determine the maximum distance you can drive the car a
Two workers hold a heavy pail. Its mass is unknown. One worker exerts a 220N force at 137 degrees from vertical. The other worker exerts a 170N force. What is the weight of the pail?