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The unit of horsepower was defined by considering the power output of a typical horse. Working-horse guidelines in the 1900s called for them to pull with a force equal to 10% of their body weight at a speed of 3.0 mph.
For a typical working horse of 1100 lb, what power does this represent in W?
What power does this represent in hp?
A rock is dropped from a high tower and falls freely under the influence of gravity. Which one of the following statements concerning the rock as it falls is true? Neglect the effects of air resistance.
Speedboat A negotiates a curve whose radius is 150 m. Speedboat B negotiates a curve whose radius is 190 m. Each boat experiences the same centripetal acceleration. What is the ratio vA/vB of the speeds of boats.
Light with a photon energy of 4.5 eV impinges on the surface of a material with work function 0.4 eV to eject electrons
Consider a game of billiards. The cue ball has an initial speed v0 before it strikes the eight ball which was previously at rest, Find the nal speeds of both the cue ball and the eight ball, assuming that the collision was perfectly elastic
A 200 gram metal block absorbs 1500 joules of heat, and its temperature changes by 150 degrees Celsius. What is the specific heat capacity of this metal
A 94 cm is pulled aside a small distance and released. After 120 oscillations the amplitude is one-half of its starting value. What is the value of the damping coefficient
A rescue helicopter lifts a 80 kg person straight up by means of a cable. The person has an upward acceleration of 0.70 m/s2, How much work is done by the tension in the cable
You pull downward with a force of 24.1 N on a rope that passes over a disk-shaped pulley of mass 1.35 kg and radius 0.0785 m. Calculate the tension in the rope on both sides of the pulley
A ball (m= .450 kg) is placed at the top of a ramp 1.00 m high. what is the ball's velocity at the bottom of the ramp
How to find the length
What must the constant acceleration of the car be after the brakes are applied so that the car would come to rest at the stop sign.
Use conservation of energy to calculate the speed of the alpha particle at infinity. m/s (e) If the two protons are released from rest and the alpha particle remains fixed, calculate the speed of the protons at infinity. m/s
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