Integrated Science
Integrated Science
7th Edition
ISBN: 9780077862602
Author: Tillery, Bill W.
Publisher: Mcgraw-hill,
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Chapter 6.2, Problem 4SC

Compared to a thick wire, a thin wire of the same length, material, and temperature has

  1. a. less electric resistance.
  2. b. more electric resistance.
  3. c. the same electric resistance.
  4. d. None of the above is correct.
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A object of mass 3.00 kg is subject to a force FX that varies with position as in the figure below. Fx (N) 4 3 2 1 x(m) 2 4 6 8 10 12 14 16 18 20 i (a) Find the work done by the force on the object as it moves from x = 0 to x = 5.00 m. J (b) Find the work done by the force on the object as it moves from x = 5.00 m to x = 11.0 m. ] (c) Find the work done by the force on the object as it moves from x = 11.0 m to x = 18.0 m. J (d) If the object has a speed of 0.400 m/s at x = 0, find its speed at x = 5.00 m and its speed at x speed at x = 5.00 m speed at x = 18.0 m m/s m/s = 18.0 m.
A crate with a mass of 74.0 kg is pulled up an inclined surface by an attached cable, which is driven by a motor. The crate moves a distance of 70.0 m along the surface at a constant speed of 3.3 m/s. The surface is inclined at an angle of 30.0° with the horizontal. Assume friction is negligible. (a) How much work (in kJ) is required to pull the crate up the incline? kJ (b) What power (expressed in hp) must a motor have to perform this task? hp
A deli uses an elevator to move items from one level to another. The elevator has a mass of 550 kg and moves upward with constant acceleration for 2.00 s until it reaches its cruising speed of 1.75 m/s. (Note: 1 hp (a) What is the average power (in hp) of the elevator motor during this time interval? Pave = hp (b) What is the motor power (in hp) when the elevator moves at its cruising speed? Pcruising hp = 746 W.)

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