An 3000-kg car traveling at 70 m/s takes 8 m to stop under full braking. The same car under similar road conditions, traveling at 140 m/s, takes ______________ to stop under full braking.
a. 16 m
b. 3 m
c. 8 m
d. 32 m
e. 18 m
Answer: d. 32 m
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When dark matter is added, what happens to the speeds of the inner and outer stars?
A.) All the speeds increased the same. B.) The stars near the center slowed down, but the outer ones were accelerated. C.) All the stars sped up, but the outer ones gained the most speed. D.) All were slowed down by the tidal drag of the dark matter. E.) There was no change.
When a body moves in circular motion at constant speed, the velocity and acceleration point __________
Fill in the blank(s) with correct word
A metal having a work function of 2.4 eV is illuminated with monochromatic light whose photon energy is 4.0 eV. What is the maximum kinetic energy of the photoelectrons produced by this light? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 5.5 × 10-19 J B) 2.6 × 10-19 J C) 3.8 × 10-19 J D) 4.7 × 10-19 J E) 6.4 × 10-19 J
What is the change in relativistic momentum of an electron that accelerates from 0.900c to 0.930c?
a. 8.63E–23 kg·m/s b. 1.27E–22 kg·m/s c. 3.96E–22 kg·m/s d. 1.83E–22 kg·m/s