The reason that when an object falls towards Earth, Earth does not move toward the object, is that the force exerted by Earth on the object is so much bigger
Indicate whether the statement is true or false
FALSE
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Which of the following is a contribution to astronomy made by Galileo?
A) The astronomical telescope can show us far more detail than the eye can. B) Jupiter has four moons orbiting it. C) The Moon has craters, mountain, valleys, and dark flat areas on its surface. D) Venus appears almost fully lit when it lies on the far side of the Sun. E) all of the above
The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is about 29 years. Suppose you have samples of both isotopes, and that they initially contain equal numbers of atoms of these isotopes
How will the activities (number of decays per second) of the samples compare? A) The activity of the cobalt-60 sample will be greater. B) The activities cannot be compared without more information. C) The activities will be equal. D) The activity of the strontium-90 sample will be greater.
A rigid rod of length l rotates about an axis perpendicular to the rod, with one end of the rod fixed to the axis. Which of the following are equal at all points on the rod? I. the angular position II. the angular velocity III. the angular acceleration IV. the centripetal acceleration V. the tangential acceleration
a. I and II b. I, II, and III c. I, II, III and IV d. I, II, III, IV and V e. I, II and IV.
If the diameter of a radar dish is doubled, what happens to its resolving power assuming that all other factors remain unchanged? Its resolving power
A) quadruples. B) doubles. C) halves. D) is reduced to one-quarter its original value. E) is reduced to one-half its original value.