If you bake cupcakes as directed for a cake, the cupcakes will be
A) over-baked.
B) under-baked.
C) properly baked.
Answer: A
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A 2.0-kg object moving 5.0 m/s collides with and sticks to an 8.0-kg object initially at rest. Determine the kinetic energy lost by the system as a result of this collision
a. 20 J b. 15 J c. 30 J d. 25 J e. 5.0 J
Gravitational Force: A spaceship is traveling to the Moon. At what point is it beyond the pull of Earth's gravity?
A. when it gets above the atmosphere B. when it is half-way there C. when it is closer to the Moon than it is to Earth D. It is never beyond the pull of Earth's gravity.
A 1-kg ball is released from a height of 6 m, and a 2-kg ball is released from a height of 3 m. Air resistance is negligible as they fall. Which of the following statements about these balls are correct? (There could be more than one correct choice
) A) As they reach the ground, the 1-kg ball will have more kinetic energy than the 2-kg ball because it was dropped from a greater height. B) As they reach the ground, the 1-kg ball will be moving faster than the 2-kg ball. C) Both balls will reach the ground with the same speed. D) Both balls will reach the ground with the same kinetic energy. E) Both balls will take the same time to reach the ground.
A child has a temperature of 101°F. If her total cross-sectional area is 2 m2, find the energy lost each second (in W) due to radiation, assuming the emissivity is 1 . (Assume the room temperature is 70°F.)
a. 217 b. 180 c. 90 d. 68 e. 850