When four hydrogen nuclei fuse to make helium, a small amount of matter is lost. What is the mass difference and energy generated? The mass of hydrogen and helium nuclei are 1.67 × 10^–27 kg and 6.646 × 10^–27 kg, respectively
a. 0.034 × 10^–27 kg, 3 × 10^–12 J b. 0.022 × 10^–27 kg, 2 × 10^–12 J
c. 0.068 × 10^–27 kg, 6 × 10^–12 J d. 0.011 × 10^–27 kg, 1 × 10^–12 J
a
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A rocket with initial mass of 3.0 × 10^4 kg fires its engines at t = 0 . The exhaust speed of the rocket is 3.9 × 10^3 m/s. If the velocity of the rocket at t = 200 s is 1 500 m/s, how much fuel did it consume?
a. 9.6 × 10^3 kg b. 3.0 × 10^4 kg c. 4.4 × 10^4 kg d. 4.8 × 10^3 kg
Assume you charge a comb by running it through your hair and then hold the comb next to a bar magnet. Do the electric and magnetic fields produced constitute an electromagnetic wave?
1.Yes they do, necessarily. 2.Yes they do, because charged particles are moving inside the bar magnet. 3.They can, but only if the electric field of the comb and the magnetic field of the magnet are perpendicular. 4.They can, but only if both the comb and the magnet are moving. 5.They can, if either the comb or the magnet or both are accelerating.
The term "albedo" refers to:
What will be an ideal response?
A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts.The power consumed by the light bulb in watts is
a. 0.05 b. 20. c. 720 d. none of the above.