A 50.0-kg skier starting from rest travels 200 m down a hill that has a 20.0° slope and a uniform surface. When the skier reaches the bottom of the hill, her speed is 30.0 m/s
(a) How much work is done by friction as the skier comes down the hill?
(b) What is the magnitude of the friction force if the skier travels directly down the hill?
What will be an ideal response?
Answer: (a) -1.10 × 104 J (b) 55.3 N
You might also like to view...
If the m = 2 fringe in Young's double-slit experiment occurs at an angle of 45.0°, what is the relationship between the wavelength l and the distance between slits, d?
a. d = 2.00l c. d = 1.41l b. d = 2.83l d. d = 4.00l
What is the primary reason that we launch X-ray telescopes into space rather than building them on the ground?
A. It is less expensive to launch them into space. B. On the ground, there would be too much light pollution from nearby cities. C. Atmospheric turbulence blurs X-ray images too much. D. X-rays from space do not reach the ground.
The observation that there are asteroids made entirely of rock or entirely of iron suggests that ________.
A. large planetesimals formed entirely out of the same material B. these asteroids were formed from volcanic eruptions on early planets C. asteroids made of both rock and iron are particularly fragile and are easily destroyed D. the early Solar System had intermediate-sized differentiated planetesimals
The net electric charge on a current-carrying wire is normally
A) zero. B) equal and opposite to the charge within the wire. C) the voltage divided by the resistance.