A horse pulls a 350-kg sled at constant speed along an icy road for a distance of 500 m. If the coefficient of kinetic friction between the sled and the road is 0.450, and the angle between the harness and the sled is 25°, what is the mechanical energy lost due to friction?
a. –9.8E+5 J
b. –6.4E+5 J
c. –1.3E+3 J
d. –7.4E+3 J
b
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A. corona B. convection zone C. radiation zone D. core
A long-wavelength wave and a short-wavelength wave both move along the same rope. Which wave has the higher frequency, and which wave carries more energy, assuming their amplitudes are the same?
A) The short-wavelength wave has the higher frequency, but the two waves carry the same amounts of energy. B) The long-wavelength wave has the higher frequency and but the short-wavelength wave carries more energy. C) The long-wavelength wave has the higher frequency and carries more energy. D) The short-wavelength wave has the higher frequency and but the long-wavelength wave carries more energy. E) The short-wavelength wave has the higher frequency and carries more energy. E) no disturbance, because they cancel.
If object A has more mass than object B,
a. A will weigh more than B. b. A will be harder to accelerate than B. c. A will be harder to keep moving in a circle. d. all of the above
The only force acting on a 2.0-kg body moving along the x axis is given by Fx = (2.0x) N, where x is in m. If the velocity of the object at x = 0 is +3.0 m/s, how fast is it moving at x = 2.0 m?
a. 4.2 m/s b. 3.6 m/s c. 5.0 m/s d. 5.8 m/s e. 2.8 m/s