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) 0.47
B) 0.58
C) 0.23
D) 0.29
Answer: A
You might also like to view...
Which of the following best describes tectonics?
A) the creation of bowl-shaped depressions by asteroids or comets striking a planet's surface B) the eruption of molten rock from a planet's interior to its surface C) the disruption of a planet's surface by internal stresses D) the wearing down or building up of geological features by wind, water, ice, and other phenomena of planetary weather
A horizontal wire carries a current straight toward you. From your point of view, the magnetic field at a point directly below the wire points
A) directly away from you. B) to the left. C) to the right. D) directly toward you. E) vertically upward.
How does the modern value of Hubble's constant compare to Hubble's original published value?
A) They are very similar. B) The modern value is about 7 times lower than the original value. C) The modern value is about 7 times higher than the original value. D) The modern value is about 700 times lower than the original value. E) The modern value is about 700 times higher than the original value.
Photoelectric Effect: When a metal is illuminated by light, photoelectrons are observed provided that the wavelength of the light is less than 520 nm. What is the metal's work function? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 2.4 eV B. 2.6 eV C. 2.8 eV D. 3.0 eV