Kieran takes off from rest down a 50 m high, 10° slope on his jet-powered skis. The skis have a thrust of 280 N parallel to the surface of the slope. The combined mass of skis and Kieran is 50 kg (the fuel mass is negligible)
Kieran's speed at the bottom is 40 m/s. What is the coefficient of kinetic friction of his skis on snow?
A) 0.23 B) 0.47 C) 0.58 D) 0.29
B
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The wavelength of a certain portion of an electromagnetic wave is 314 nm. What is its frequency and classification?
A) 9.55 × 1014 Hz, ultraviolet B) 9.55 × 1014 Hz, X-ray C) 8.44 × 1015 Hz, X-ray D) 9.55 × 1015 Hz, ultraviolet
A locomotive is pulling three wagons along a level track with a force of 100,000 N. The wagon next to the locomotive has a mass of 80,000 kg, the next one, 50,000 kg, and the last one, 70,000 kg. Neglect friction
What is the force between the 80,000-kg and 50,000-kg wagons? A) 35,000 N B) 40,000 N C) 50,000 N D) 60,000 N E) 65,000 N
Four different main-sequence stars are colored blue, orange, red, and yellow. What is their rank from coolest to hottest?
A) red, yellow, orange, blue B) blue, yellow, orange, red C) red, orange, yellow, blue D) orange, blue, yellow, red
According to Einstein, events that are simultaneous in one frame of reference
A) are simultaneous in all frames of reference. B) are not simultaneous in other frames of reference. C) may or may not be simultaneous in other frames of reference.