A piece of putty moving with 1 unit of momentum strikes and sticks to a heavy bowling ball initially at rest. After the putty sticks to the ball, both move with a combined momentum of
A) less than 1 unit.
B) more than 1 unit.
C) 1 unit.
D) not enough information
Answer: C
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Nine bulk silicon carbide specimens of the same size were tested and the following strengths were obtained: 22, 26, 33, 50, 29, 56, 58, 41, and 43 MPa.
(a) Plot these data to evaluate the characteristic strength and the Weibull modulus. (b) What is the stress for a 90 % probability of survival for this material?
Older red stars are found where in the Galaxy?
A. only in the disk B. only in the bulge C. only in the halo D. all throughout the Galaxy
When an electron in H changes its spin from the same to the opposite direction as the proton, it:
A) emits an X-ray photon. B) absorbs a radio wave photon. C) emits a radio wave photon. D) absorbs a visible light photon. E) neither emits nor absorbs a photon.
What is the result of the Greenhouse effect on the surface environment of Venus?
A) It has little or no effect. B) Its effect is about the same as on Earth. C) It has reduced the surface temperature by about 30 degrees Celsius. D) It has raised the surface temperature by hundreds of degrees Celsius. E) It causes the surface temperature of Venus to become hotter than the Sun.