From the point of view of an observer on the earth, a muon produced high in the atmosphere can reach the ground before decaying because
a. relativity gives it extra time to get there
b. of the uncertainty principle
c. it is a short distance to the ground
d. relativity shortens the distance to the ground
A
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An 85.0-kg man climbs onto a 900-kg car with worn out shock absorbers and whose springs have an effective force constant of 125 kN/m. As he drives along, he hits a bump, and this starts the car oscillating with simple harmonic motion
What is the smallest amplitude of the oscillations that will cause him to bounce from his seat? A) 7.06 cm B) 7.73 cm C) 7.88 cm D) 8.95 cm E) 8.42 cm
In the context of the unified model of active galactic nuclei (AGN), you see jets of gas and radiation emerging perpendicular to the accretion disk of an AGN and coming straight at you if:
A) the accretion disk is tilted at an angle of 30 degrees to your line of sight. B) you look directly into the central cavity around the black hole. C) you view the accretion disk from its edge. D) the accretion disk is tilted at an angle of 60 degrees to your line of sight.
The diagrams below show forces of magnitude F applied to an equilateral triangular block of uniform thickness. In which diagram(s) is(are) the block in equilibrium?
a.
A
b.
B
c.
C
d.
D
e.
A and B
The Huygens probe took numerous pictures as it descended to the surface of Saturn's moon Titan in 2005. What did the pictures show?
A) features or erosion, including what appeared to be dry river valleys and lakebeds B) primitive life forms C) a densely cratered surface D) lava flows of molten basalt