You want to store 1,000 J of energy in an ideal spring when it is compressed by only 2.5 cm. What should be the spring constant of this spring?
What will be an ideal response?
3.2 × 106 m/m
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A circus diver drops from a high pole into water far below. When he is halfway down
A) his potential energy is halved. B) he has gained an amount of kinetic energy equal to half his initial potential energy. C) his kinetic energy and potential energy are equal. D) all of the above E) none of the above
A cheetah can run at approximately 100 km/h and a gazelle at 80.0 km/h. If both animals are running at full speed, with the gazelle 50.0 m ahead, how long before the cheetah catches its prey?
a. 9.0 s b. 14 s c. 18 s d. 4.5 s e. 21 s
According to the Stefan–Boltzmann law, an object at room temperature that is sitting in a room (also at room temperature) must emit electromagnetic radiation. Since it is losing energy by emitting this radiation, why does its temperature remain constant?
A. It receives heat by conduction from the air and from what it is sitting on. B. It receives heat by convection from the air. C. It receives heat by radiation from objects in the room. D. All of the above. E. Its temperature actually does decrease. F. It does not actually emit any radiation. T. Some other explanation (specify)
A wheel rotating about a fixed axis with a constant angular acceleration of 2.0 rad/s2 starts from rest at t = 0 . The wheel has a diameter of 20 cm. What is the magnitude of the total linear acceleration of a point on the outer edge of the wheel at t = 0.60 s?
a. 0.24 m/s2 b. 0.50 m/s2 c. 0.14 m/s2 d. 0.34 m/s2 e. 0.20 m/s2