A star's position along the horizontal axis of an H-R diagram tells us all of the following except the star's
A) radius.
B) spectral type.
C) surface temperature.
D) surface color.
A) radius.
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If the current in a wire is tripled, what effect does this have on the electron drift velocity in the wire?
a. It stays the same. b. It triples. c. It decreases by a factor of three. d. It increases by a factor of nine.
A catapult is tested by Roman legionnaires. They tabulate the results in a papyrus and 2000 years later the archaeological team reads (distances translated into modern units):
angle of landing height = launch height. What is the initial velocity of launch of the boulders if air resistance is negligible? A) 44 m/s B) 1.4 m/s C) 22 m/s D) 0.69 m/s
A styrofoam container used as a picnic cooler contains a block of ice at 0°C. If 225 grams of ice melts in 1 hour, how much heat energy per second is passing through the walls of the container? (The heat of fusion of ice is 3.33 × 105 J/kg).
What will be an ideal response?
A 600-kg car is going around a curve with a radius of 120 m that is banked at an angle of 20° with a speed of 24.5 m/s. What is the minimum coefficient of static friction required for the car not to skid?
A) 0.12 B) 0.24 C) 0.36 D) 0.48 E) 0.60