To say a circuit is dc is to say that current in the circuit
A) has a single direction.
B) alternates only slowly.
C) is parallel to the connecting wires.
Answer: A
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Photoelectric Effect: A photoelectric surface has a work function of 2.10 eV. Calculate the maximum kinetic energy, in eV, of electrons ejected from this surface by electromagnetic radiation of wavelength 356 nm. (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
Waves on a String: What is the wave speed in a brass wire with a radius of 0.500 mm stretched with a tension of 125 N? The density of brass is 8.60 × 103 kg/m3.
A. 0.121 m/s B. 100 m/s C. 136 m/s D. 500 m/s E. 68.8 m/s
Elastic Collisions: In a game of pool, the white cue ball hits the #5 ball and stops, while the #5 ball moves away with the same velocity as the cue ball had originally. Both balls have the same mass. This type of collision is
A. somewhat inelastic. B. elastic. C. completely inelastic.
A 300-g glass thermometer initially at 25°C is put into 200 cm3 of hot water at 95°C. Find the final temperature (in °C) of the thermometer, assuming no heat flows to the surroundings. (The specific heat of glass is 0.2 cal/g×°C.)
a. 52 b. 68 c. 89 d. 79 e. 36