An object of mass m is hanging by a string from the roof of an elevator. The elevator is moving up at a constant speed. What is the tension in the string?
A. greater than mg
B. less than mg
C. equal to mg
D. depends on the speed of the elevator
C. equal to mg
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After nuclear reactions in the big bang had ended, about 25% of the mass of the Universe was in the form of helium nuclei
a. True b. False Indicate whether the statement is true or false
Relate differentiation to Saturn's excess internal heat
What will be an ideal response?
Two stars of masses M and 6M are separated by a distance D. Determine the distance (measured from M) to a point at which the net gravitational force on a third mass would be zero.
A. 0.41 D B. 0.33 D C. 0.37 D D. 0.29 D E. 0.14 D
Astronauts in a space shuttle that orbits the Earth are in a state of "free fall" that makes them appear to be weightless. If an astronaut brings a helium balloon to a pressurized room of a space shuttle while it is in orbit, what would the helium balloon do?
1.It would float to the top of the cabin. 2.It would sink slowly to the bottom of the cabin. 3.It would remain wherever it is placed. 4.It would remain at whatever height it is placed, but it would move horizontally to one side of the cabin.