Collisions between galaxies typically unfold over a period of ________
A) hundreds of millions of years B) several days
C) several months D) thousands of years
A
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If the absolute temperature of an object is tripled, the thermal power radiated per unit surface area of this object will (assuming that its emissivity is not affected by the temperature change)
A) increase by a factor of 3. B) increase by a factor of 9. C) increase by a factor of 18. D) increase by a factor of 27. E) increase by a factor of 81.
The actual depth of a shallow pool 1.00 m deep is not the same as the apparent depth seen when you look straight down at the pool from above. How deep (in cm) will it appear to be? (nwater = 1.33.)
a. 133 b. 75.2 c. 90.6 d. 117 e. 100
Two blocks, joined by a string, have masses of 3.0 and 4.0 kg. They rest on a frictionless horizontal surface. A second string, attached only to the 4.0-kg block, has horizontal force = 40 N applied to it. Both blocks accelerate. Find the tension in the string between the blocks
a. 23 N b. 5.7 N c. 17 N d. 93 N e. 120 N
Large molecular clouds will form into protostars because of ____
a. the thermal motions of the atoms in the gas cloud b. gravitational contraction c. radiation pressure from nearby stars d. the temperature reaching a critical point e. condensation of dust and gas