An archer pulls her bow string back 0.40 m by exerting a force that increases uniformly from zero to 240 N. What is the equivalent spring constant of the bow, and how much work is done in pulling the bow?
600 N/m, 48 J
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Angular Quantities: Express the angular speed of an old 33 1/3 rpm LP in rad/s.
Fill in the blank(s) with the appropriate word(s).
According to current understanding, which of the following is required in order for a planet to have rings?
A) The planet must orbit its star at a distance greater than Mars orbits the Sun. B) The planet must have many small moons that orbit relatively close to the planet in its equatorial plane. C) The planet must once have had a large moon that came too close to it, shattering the moon and creating the ring particles. D) The planet must be at least as massive as Saturn.
Three 10-ohm resistors take the shape of a triangle, one resistor in each leg. An ohm-meter across any two points of the triangle will show the equivalent resistance to be
A) 1.4 ohms. B) 5 ohms. C) 6.7 ohms. D) greater than 6.7 ohms.
A mass of 2.0 kg traveling at 3.0 m/s along a smooth, horizontal plane hits a relaxed spring. The mass is slowed to zero velocity when the spring has been compressed by 0.15 m. What is the spring constant of the spring?
A) 800 N/m B) 400 N/m C) 9.0 N/m D) 18 N/m E) 20 N/m