An automobile of mass 2000 kg moving at 20 m/s is braked suddenly with a constant braking force of 10,000 N. How far does the car travel before stopping?
a. 40 m
c. 120 m
b. 80 m
d. 160 m
A
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A mass-spring system on a horizontal frictionless surface is set in simple harmonic motion with amplitude A. The mass is then doubled and the system is again set into simple harmonic motion with the same amplitude. Which of the following is true about the total mechanical energy of the system due to doubling the mass?
a. It has doubled. c. It has halved. b. It has quadrupled. d. It has not changed.
If the relative magnetic permeability of a material is equal to 0.99999, this material is
(a) Diamagnetic. (b) Paramagnetic. (c) Ferromagnetic. (d) Antiferromagnetic.
Equilibrium: A light board that is 10 m long is supported by two sawhorses, one at one end of the board and a second at the midpoint. A 40-N object is placed between the two sawhorses, 3.0 m from the end and 2.0 m from the center. A second object, with a weight of 15 N, is placed on the supported end. What magnitude forces do the sawhorses exert on the board?
What will be an ideal response?
Magnetic Field of a Long Wire: Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 20 cm. At what point between the two wires do they produce the same strength magnetic field?
A. 4.0 cm from the 20 A wire B. 8.0 cm from the 20 A wire C. 12 cm from the 20 A wire D. 16 cm from the 20 A wire E. 18 cm from the 20 A wire