A proton (+1.6 × 10^-19 C) moves 10 cm on a path in the direction opposite to a uniform electric field of strength 3.0 N/C. How much work is done on the proton by the electrical field?
a. 4.8 × 10^-20 J
c. zero
b. 1.6 × 10^-20 J
d. -4.8 × 10^-20 J
D
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a. True b. False Indicate whether the statement is true or false
Strictly speaking, when you step off a curb you are momentarily
A) in orbit. B) weightless. C) in space.
In grinding a steel knife, the metal can get as hot as 400°C
If the blade has a mass of 80 g, what is the minimum amount of water needed at 20°C if the water is to remain liquid and not rise above 100°C when the hot blade is quenched in it? The specific heat of the steel is 0.11 cal/g ? C° and the specific heat of water is 1.0 cal/g ? C°. A) 22 g B) 33 g C) 44 g D) 55 g
Someone on the far side of the Moon would observe Earth rise once every
a. 24 hours. b. 24 hours and 50 minutes. c. 29.5 Earth days. d. None of these, the observer would never see Earth rise.