A popular swinging-balls apparatus (Newton's cradle) consists of a series of identical elastic balls suspended by strings so they barely touch each other
When two balls are pulled away from one end and released, they strike the row of balls and two balls pop out from the other end. If instead, one ball popped out with twice the speed, this would violate the conservation of
A) momentum.
B) energy.
C) both of these
D) none of the above
Answer: B
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Jovian worlds that orbit close to their host stars are called ____________
Fill in the blank(s) with correct word
The force of Earth's gravity on a capsule in space will lessen as it moves farther away. If the capsule moves to twice its distance, the force toward Earth becomes
A) half. B) three-quarters. C) one-fourth. D) none of the above
A platinum wire that is 1.20 m long has a radius of 0.500 mm and is fixed at both ends. In its third harmonic it vibrates at 512 Hz. The density of platinum is 21.4 × 103 kg/m3. What is the tension in the wire?
A) 4.00 kN B) 2.00 kN C) 2.82 kN D) 1.41 kN E) 1.00 kN
The break-up of Pangaea had worldwide consequences with the exception of
A) the lowering of sea level. B) a rise in sea level. C) the divergence and evolution of new species. D) climate change.