How much heat is necessary to change 20 g of water at 100°C into steam at 100°C?
a. 0.16 kcal
b. 10800 kcal
c. 10.8 kcal
d. 1.6 kcal
c
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A He-Ne laser, which produces light of wavelength 632.8 nm, is used to calibrate a diffraction grating. If the first-order maximum occurs at 20.5° from the central spot, what is the distance between the slits of the grating?
A) 0.905 µm B) 1.81 µm C) 2.20 µm D) 3.62 µm E) 4.52 µm
A 12.0-V battery (potential source) is connected across a 6.00-µF air-filled capacitor
(a) How much energy can be stored this way? (b) How much excess charge is on each plate of the capacitor?
You and Al are both floating freely in your spaceships. Suppose that Al is moving away from you at 85 km/hr. You throw a ball in his direction at a speed of 75 km/hr. According to Al, which of the following is going on?
A) He sees you moving toward him at 85 km/hr and the ball moving toward him at 75 km/hr. B) He sees you moving away from him at 85 km/hr and the ball moving toward him at 10 km/hr. C) He agrees that he is moving at 85 km/hr and the ball is moving at 75 km/hr while you are standing still. D) He sees you moving away from him at 85 km/hr and the ball moving away from him at 10 km/hr.
The angular momentum of a rotating body is conserved when
A. when the body has a constant angular acceleration. B. the shape of the body does not change. C. no net force acts on the body. D. no net torque acts on the body.