A 20-N crate starting at rest slides down a rough 5.0-m long ramp, inclined at 25° with the horizontal. 30 J of energy is lost to friction. What will be the speed of the crate at the bottom of the incline?
a. 0.98 m/s
c. 3.5 m/s
b. 2.1 m/s
d. 4.7 m/s
C
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Work-Energy Theorem: A 1000-kg car experiences a net force of 9500 N while slowing down from 30 m/s to 15.9 m/s. How far does it travel while slowing down?
A. 34 m B. 31 m C. 37 m D. 41 m
Compared with the period of satellites in close Earth orbit, the period of satellites orbiting far from Earth is
A) shorter. B) the same. C) longer. D) need more information
The speed of a sound wave in air depends on
A) its frequency. B) its wavelength. C) air temperature. D) all of the above E) none of the above
Charge in an Electric Field: A particle with a charge of +4.0 ?C has a mass of 5.0 g. What magnitude electric field directed upward will exactly balance the weight of the particle?
A. 4.1 × 104 N/C B. 8.2 × 104 N/C C. 4.4 × 104 N/C D. 1.2 × 104 N/C E. 5.1 × 104 N/C