A traveling wave train has wavelength 1.0 m and speed 20 m/s. Find the wave frequency
a. 0.025 Hz
c. 40 Hz
b. 20 Hz
d. 10 Hz
B
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A gasoline engine absorbs 2500 J of heat at 250°C and expels 2000 J at a temperature of 50°C. What is the magnitude of the change in entropy (in J/K) for the system?
a. 6.2 b. 4.7 c. 1.4 d. 10.9 e. 3.2
A 2.0-kg ball moving eastward at 3.0 m/s suddenly collides with and sticks to a 4.0-kg ball moving northward at 2.0 m/s. What is the magnitude of the momentum of this system just after the collision?
A) 10 kg ? m/s B) 6.0 kg ? m/s C) 8.0 kg ? m/s D) 2.0 kg ? m/s E) 14 kg ? m/s
An object in orbit around Earth
a. is not experiencing gravity. b. is in free fall. c. is accelerating towards Earth. d. is in free fall and is accelerating toward Earth.
Increasing the temperature of a blackbody by a factor of 3 will increase its energy by a factor of:
A) 3. B) 6. C) 9. D) 12. E) 81.