To measure the mass of an astronomical object, one can observe the orbital period and distance of a companion
Indicate whether the statement is true or false
TRUE
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One cat meowing produces a sound intensity level of 55. db
(a) What would be the sound intensity level of 2 cats meowing? (b) ... of 10 cats meowing? (c) ... of 100 cats meowing?
There is no upper limit to the mass of a neutron star
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Which of the following is an example of chemical energy?
A) the energy stored in firewood that has been gathered for burning B) the energy stored in your body, that enables you to do work C) Both of the above. D) the energy in a stretched rubber band E) the energy in hot steam
When you drag a toy teddy bear along the floor by a force that is parallel to the floor, the magnitude of the force of friction
a. is independent of velocity or acceleration. b. increases when the velocity increases. c. is proportional to the acceleration. d. decreases when the force parallel to the floor increases. e. increases when the force parallel to the floor increases.