Relative Velocity: A submarine must travel how fast (with respect to the water) and be pointed in what direction such that it moves 10 m/s directly northward (relative to the earth) if the water moves westward at 5.0 m/s?
What will be an ideal response?
11 m/s at 63° north of east
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You find yourself in a very low-density gas that is extremely hot. In fact, the temperature of the gas is so high that it is emitting lots of X-rays
There are no stars anywhere within about 10,000 light-years of you, but at slightly greater distances, your sky is brightened by hundreds (perhaps thousands) of beautiful, star-filled structures, some with majestic spiral shapes. Where are you? A) You are in the universe about 380,000 years after the Big Bang when the cosmic microwave background radiation was formed. B) You are in intergalactic space within a rich cluster of thousands of galaxies. C) You are in the center of the Milky Way Galaxy, looking outward into the Local Group. D) You are in the universe when it was about 500 million years old, just before galaxies began to form. E) You are in the outskirts of a galaxy whose nucleus is a powerful quasar.
If ? = 40° and the tension in string 2 is 30 N, determine M
a.
3.4 kg
b.
3.6 kg
c.
2.6 kg
d.
4.9 kg
e.
7.5 kg
Where would you find Van Allen belts of radiation?
a. Within Earth's core b. Within Earth's ozone layer c. Within Earth's magnetosphere d. Within Earth's mantle e. Within Earth's subduction zones
An aluminum cantilever beam (E 5 72 GPa) with a square cross section and span length L 5 2.5 m is sub- jected to uniform load q 5 1.5 kN/m. The allowable bending stress is 55 MPa. The maximum deflection of the beam is approximately:
(A) 10 mm
(B) 20 mm
(C) 30 mm
(D) 40 mm
