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

Physics & Space Science

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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.

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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.

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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

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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

Physics & Space Science