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A cart is set rolling across a level table, at the same speed on every trial. If it runs into a patch of sand, the cart exerts on the sand an average horizontal force of 6 N and travels a distance of 6 cm through the sand as it comes to a stop. If instead the cart runs into a patch of flour, it rolls an average of 18 cm before stopping. What is the average magnitude of the horizontal force the cart exerts on the flour?
A vehicle attempting to aerbrake into orbit around Mars needs to achieve an equivalent deltaV(retro) of 2 km/s. what is the average drag force (in g's) we must attain
A rope goes over a circular pulley with a radius of 7.5 cm. If the pulley makes four revolutions without the rope slipping, what length of rope passes over the pulley
Suppose the speed of light in a vacuum were only 25.5 mi/h. Find the length of the bicycle being ridden at a speed of 20.0 mi/h as measured by an observer sitting on the park bench, given that its proper length is 1.59 m.
A piano tuner sounds two strings simultaneously. One has been previously tuned to vibrate at 301.0 Hz. The tuner hears 2.0 beats per second. What was the original frequency of the untuned string
You leave your 100 W portable color TV on for 4 hours each day and you do not pay attention to the cost of electricity. what would be your monthly (30 day) bill
charge q1=1 ?C is located at the position (x,y,)=(5 cm, 7 cm). A second charge, q2=2 ?C is located at the position (x,y,)=(5 cm, 0 cm). Calculate the work required to move a third charge
A gymnast whose mass is 50.0 kg swings back and forth on a 4.0m long rope. What is her velocity at the bottom of the swing
(a) Calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 11.0 g. Silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) Imagine adding electrons to the pin until the negative charge ha..
You then maintain a constant speed of 65.0 mph. You pass the patrol car 16 seconds after you at first applied the brakes and are relieved that he doesn't pull out after you. How far away was the highway patrol car when you first saw it.
Water drives a waterwheel (or turbine) of radius R = 3.0 m as shown in the figure. The water enters at a speed v1 = 6.5m/s, What is the torque the water applies to the waterwheel
What is the minimum energy that photons must have to produce 59 keV electrons in a Compton scattering
A 3600 kg truck is moving at a constant speed of 50.0 m/s. The coefficient of friction between the tires and the road is .550. find What is the net force acting on the car
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