In order to move in a perfectly circular path, the net force on an object must
A. equal zero.
B. have a constant magnitude and direction.
C. always change both magnitude and direction.
D. always change magnitude but not direction.
E. always change direction but not magnitude.
Answer: E
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A star more massive than our Sun
A) will have a longer lifetime B) will have a shorter lifetime C) will have the same lifetime as the Sun D) could have either a longer lifetime or a shorter lifetime depending on its chemical composition
Which of the following is true of the near Earth objects?
A) They are at least as big as Earth. B) Their density is the same as that of Earth. C) They pose the threat of eventual collision with Earth. D) Their orbits are the same as those of the planets near Earth.
Two single wave pulses are sent along a rope. Both have the same height, but one is upward and the other is downward. As they are passing through each other, they will momentarily cancel each other out
What becomes of their energy as they are passing through each other? A) It is still there in the form of kinetic energy of the rope. B) It is momentarily destroyed due to destructive interference. C) It is still there in the form of thermal energy of the rope and air. D) It is still there in the form of gravitational energy of the rope. E) Actually the pulses contained no energy to begin with.
If the sum total mass of reactants in a nuclear reaction is less than that of product particles, then which of the following statements best describes the conditions of the reaction?
a. reaction releases energy b. reaction absorbs energy c. atomic number of each reactant must be less than 80 d. atomic number of each reactant must be greater than 40