A rubber ball and a lump of clay have equal mass. They are thrown with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The clay sticks to the wall
Which one of these objects experiences the greater momentum change? A) the ball
B) the clay
C) Both of them experience the same non-zero momentum change.
D) Both of them experience zero momentum change.
A
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If the hypothesis tracing the extinction of the dinosaurs to an impact is correct, the dinosaurs died off largely because ________
A) the impact caused massive earthquakes worldwide B) radiation from iridium in the asteroid caused the dinosaurs to die of cancer C) of global climate effects initiated by dust and smoke that entered the atmosphere after the impact D) of injuries suffered from direct hits of pieces of the asteroid or comet
What is the angular magnification of a magnifying glass of focal length 4.0 cm if the image is to be viewed by a relaxed eye (image at the far point) having a near point of 25 cm and a far point at infinity?
A) 2.0 x B) 3.0 x C) 3.6 x D) 4.0 x E) 6.3 x
Young children that need glasses are rarely prescribed bifocals. Why?
a. They are almost always nearsighted. b. They are almost always farsighted. c. They have considerable accommodation power. d. Parents don't go for the additional expense.
The critical density of the universe is the
A) average density the universe would need for gravity to someday halt the current expansion if dark energy did not exist. B) actual average density of the universe. C) density of dark matter in the universe. D) density of water.