Power: A 200-? resistor is rated at 1/4 W. What is the maximum current it can safely draw?
A. 0.035 A
B. 0.35 A
C. 50 A
D. 0.25 A
Answer: A
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The electrons in a beam are moving at 18 m/s. (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
(a) What is its de Broglie wavelength these electrons? (b) If the electron beam falls normally on a diffraction grating, what would have to be the spacing between slits in the grating to give a first-order maximum at an angle of 30° with the normal to the grating?
A 1200-kg automobile moving at 25 m/s has the brakes applied with a deceleration of 5.0 m/s2 . How far does the car travel before it stops?
a. 39 m c. 55 m b. 31 m d. 63 m
Latent Heats: A .20-kg ice cube at 0.0°C has sufficient heat added to it to cause total melting, and the resulting water is heated to 70.0°C. How much heat is added? For water LF = 334,000 J/kg, LV = 2.256 × 106 J/kg, the c = 4.186 × 103 J/kg ? C.
A. 130 kJ B. 14,000 kJ C. 81 kJ D. 59 kJ
According to Einstein's theory of relativity, how much energy is contained in the material of a one kilogram rock that is at rest on the ground?
A) None at all. B) 3 × 1016 joules C) 9 × 1016 joules D) 9 × 1010 joules E) 10-16 joules