College Physics
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Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Transcribed Image Text:4. A 0.25 hp motor is used to lift a load at the rate of 5 cm/s.
How great a load can it lift at this constant speed?
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- An elevator has a mass of 1160 kg and carries a maximum load of 612 kg. A constant frictional force of 3330 N retards its motion upward. What power must the motor deliver at a instantaneous speed of 3.38 m/s if the elevator is designed to provide an upward acceleration of 1.4 m/s2? The acceleration due to gravity is 9.8 m/s². Answer in units of W. Your response... Previous Responses X #1.55825.432 PALETTEarrow_forward1. A box with a mass of 3.0 kg is accelerated from rest by a constant force across a floor at a rate of 1.7 m/s for 6.5 s. (a) How much work does the force do on the box? (b) How much power is produced by the force in moving the box?arrow_forward4) An archer draws his compound bow and shoots an arrow. The 25 g arrow leaves the bow with a velocity of 95 m/s. The power stroke of the bow is 57 cm; that is, the bowstring exerts force on the arrow through a displacement of 57 cm. The peak draw weight of the bow is 312 N. (This is the maximum force that the archer has to exert on the bowstring.) a. How much kinetic energy does the arrow have after release? b. If shot straight up, how high will the arrow go?arrow_forward
- A 2,000-kg pile driver is used to drive a steel I-beam into the ground. The pile driver falls 3.00 m before coming into contact with the top of the beam, and it drives the beam 14.6 cm farther into the ground as it comes to rest. Using energy considerations, calculate the average force the beam exerts on the pile driver while the pile driver is brought to rest.arrow_forwardAn elevator is designed so that when it travels upward, it has constant acceleration from rest to its cruising speed of 2.0 m/s in a time of 4.0 seconds. The elevator has a mass of 625kg. Assume friction is ignored. A. Determine the average power (in W) of the elevator motor while its accelerating upward to its cruising speed. B. Determine the motor power (in W) when the elevator is moving upward at its cruising speed.arrow_forwardA 35.0 kg crate sits on a conveyor belt with s = 0.870. The conveyor belt starts at rest.Once it is turned on, the crate (which follows the belt, so that it stays at rest with respect to thebelt) speeds up to 2.30 m/s in a uniform fashion. How much power does the motor use to turnthe conveyor belt?arrow_forward
- A car engine produces a constant power of P = 341 hp. The car and motor have a combined mass of m = 1830 kg. 1.) The car starts from rest, after t=5 seconds, what is the cars speed, you may assume no energy is required to spin the tires. 2.) Assume a dragster of mass m=1000kg can accelerate to cover 450 m and accelerate in 7.2 s from a dead stop, how much horsepower is the engine producing, assuming acceleration is constant?arrow_forward1. The motor of a ski boat produces a power of 36.600 W to maintain a constant speed of 14.0m/s. To pull a water skier at the same constant speed, the motor must produce a power of 37.800W. What is the tension in the rope pulling the skier? Explain and draws.arrow_forward3. An 80.0 kg student running at 3.5 m/s JUMPS up 2m into the air and grabs a rope that is hanging vertically up 2m from the ground. (ignore his height and assume his center of gravity is where he is holding the rope). How high from the ground will the student swing? SOLVE USING ENERGY PLEASE! Assume no air resistance. 2.0 marrow_forward
- 2. Mikey sees that the right front tire (m 30.0 kg) of Granny's car has landed in front of him. He picks it up and runs for 40 m at a constant velocity of 2.0 m/s to return it to her. How much work did Mikey do on the tire from 10 m to 20 m into his run? =arrow_forward24. A skier of mass 70 kg is pulled up a slope by a motor-driven cable. How many horsepower output must a motor have to pull him 100 m up a 30° frictionless slope at a constant speed of 2 m/s? a.700 b. 0.94 c. 746 d. 1.06 a b darrow_forward3. A backhoe pushes a rubbish pile with a force of 1200 N for a distance of 400 meters. It takes the backhoe 30 seconds to move the rubbish pile. Calculate the work performed by the backhoe on the rubbish pile. Calculate the power of the backhoe pushing the rubbish pile.arrow_forward
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