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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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.
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?