A 6.0-J pulse of light from a laser has what momentum?
a. Light does not have momentum because it doesn't have mass.
b. 3.0 × 10^9 kg·m/s
c. 6.7 × 10^–9 kg·m/s
d. 2.0 × 10^–8 kg·m/s
d
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A 2.0-kg object moving 3.0 m/s strikes a 1.0-kg object initially at rest. Immediately after the collision, the 2.0-kg object has a velocity of 1.5 m/s directed 30° from its initial direction of motion. What is the y component of the velocity of the 1.0-kg object just after the collision?
a. ?3.7 m/s b. ?3.4 m/s c. ?1.5 m/s d. ?2.4 m/s e. ?4.1 m/s
Material use rates rose substantially in the twentieth century
What will be an ideal response?
Now consider Object 2. What can you say about Object 2 in comparison to Object 1?
A) Object 2 is moving away from us faster than Object 1. B) Object 2 contains more hydrogen than Object 1. C) Object 1 had a higher temperature than Object 2. D) Object 2 is moving toward us while Object 1 is moving away from us.
The complete magnetic cycle is 11 years long, whereas the sunspot cycle is 22 years long
Indicate whether the statement is true or false