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Q. An 52.0 N box of clothes is pulled 6.7 m up a 30.0° ramp by a force of 107 N that points along the ramp. If the coefficient of kinetic friction between the box and the ramp is 0.22, calculate the change in the box's kinetic energy.
Q. Children in a tree house lift a small dog in a basket 4.00 m up to their house. If it takes 259 J of work to do this, what is the combined mass of the dog and basket?
What is the tension in (a) the nearer (relative to the person) cable and (b) the farther (relative to the person) cable.
A train is traveling up a 3.3 incline at a speed of 2.45 when the last car breaks free and begins to coast without friction. Explain how long does it take for the last car to come to rest momentarily?
A skier is accelerating down a 30.0 degree hill at 1.8 m/s^2. How long will it take her to reach the bottom of the hill, assuming she starts from rest and accelerates uniformly, if elevation change is 325 m.
A student makes a simple generator by using a single square loop 24 cm on each side. The loop is then rotated at a frequency of 60 Hz in a magnetic field of 0.044 T.
If a 200 N force F1 is applied to the piston with the 4 cm diameter, Calculate the magnitude of the force F2 that can be resisted by the piston with the 10 cm diameter? Ignore the weights of the pistons.
If the string is 9.50 m long, has a mass of 55g and is pulled taut with a tension of 9.5 N, how much time does it take for a wave to travel from one end of the string to other.
What must the charge (sign and magnitude) of a 1.43 g particle be for it to remain stationary when placed in a downward-directed electric field of magnitude 630.
Daisy throws a rock horizontally with a speed of 12 m/s from a bridge. It falls 2.28 s before reaching the water below. When the rock hits the water it is traveling with what horizontal component of the velocity.
A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1360 Hz. The bird-watcher, however, hears a frequency of 1430 Hz. What is the speed of the bird, expressed as a percentage of the speed of sound?
A 4.00 kg model rocket is launched, expelling 46 g of burned fuel from its exhaust at a speed of 590m/s. What is the velocity of rocket after the fuel has burned? Hint: overlook the external forces of gravity and air resistance.
The springs of a 1300kg car compress 6.00 mm when its 68 kg driver gets into the driver's seat. If the car goes over a bump, what would be the frequency of vibrations.
You're carrying a 4 m long, 23 poles to a construction site when you decide to stop for a rest. You place one end of the pole on a fence post and hold other end of the pole 35 from its tip. How much force should you exert to keep the pole motionle..
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