College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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- A 50-ft chain with mass density 10 lb/ft is initially coiled on the ground. How much work is performed in lifting the chain so that it is fully extended (and one end touches the ground)?arrow_forwardA box is on the floor. You lift the box and place it on a shelf that is 3.85 meters from the floor. If it takes 201 J of work to do this, what is the mass of the box?arrow_forwardA 164 kg mass is lifted 1.8 m. What is the potential energy of the mass (in J)? Your Answer:arrow_forward
- Please show or state thinkingarrow_forwardA projectile has undergone an elastic one-dimensional collision with an initially stationary target, along an x axis. The figure below is a graph of position versus time for the projectile and target, before and after the collision. (Two line segments are parallel to the time axis.) Which is true about the masses of the projectile and target? 4 O the projectile's mass is greater O the target's mass is greater O the masses are equalarrow_forwardA typical human brain has a mass of 1.4 kg, which makes up about 2% of a person's mass. However, the brain requires 20% of the body's power consumption. In essence, the brain requires 10 times as much power as any other organ in the body. The average power output of the human brain is about 2.0 × 10¹ W. Assume that the brain's power output could be converted into mechanical work and calculate how high we could use this power to lift an apple (m = 0.20 kg) in one minute. Number pa Unitsarrow_forward
- In the figure, a 3.97 g ice flake is released from the edge of a hemispherical bowl whose radius ris 13.7 cm. The flake-bowl contact is frictionless. (a) How much work is done on the flake by the gravitational force during the flake's descent to the bottom of the bowl? (b) What is the change in the potential energy of the flake-Earth system during that descent? (c) If that potential energy is taken to be zero at the bottom of the bowl, what is its value when the flake is released? (d) If, instead, the potential energy is taken to be zero at the release point, what is its value when the flake reaches the bottom of the bowl? (a) Number (b) Number -5.34e-3 (c) Number 5.34e-3 (d) Number 5.34e-3 Units Units Units Ice flake- Mik Units Jarrow_forwardA bag is dragged up a rough slope at a constant speed by a rope on a winch. The kinetic energy of the bag is 500 J and it gains 1000 J in potential energy as it is dragged up the slope. If the work done by the winch to lift the bag up the slope is 1500 J, how much energy was lost as thermal energy?arrow_forwardSomeone is stuck at the top of a tower, and is very thirsty. A heroic dog, weighing 40lbs, carries a bucket of water, weighing 5 lbs, up a helical staircase that encircles a tower with a radius of 15ft. The tower is 60ft high and the dog makes exactly three complete revolutions climbing to the top. Unfortunately the bucket leaks water at a steady rate, and during the ascent, 1lb of water leaks out. How much work is done by the dog against gravity?arrow_forward
- The rate of energy use in a typical house is about 2 kW. If the kinetic energy of a car (mass 1358 kg) is equal to the total energy used by the house in 1 min, what is the car's speed? m/sarrow_forwardA force of 4 pounds is required to hold a spring stretched 0.2 feet beyond its natural length. How much work (in foot-pounds) is done in stretching the spring from its natural length to 0.8 feet beyond its natural length?arrow_forwardAn object with a mass of 2.44 kg is initially moving at a rate of 5.54 m/s. A net work of 36.3 J is done, resulting in a change in the object's speed. What is its final speedarrow_forward
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