About how long will a 0.5 star spend on the main sequence?
a. 5 billion years
b. 57 billion years
c. 570 million years
d. 5 million years
e. 500 thousand years
B
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Relative Velocity: A boat, whose speed in still water is 1.75 m/s, must aim upstream at an angle of 26.3° (with respect to a line perpendicular to the shore) in order to travel directly across the stream.(a) What is the speed of the current?(b) What is the resultant speed of the boat with respect to the shore?
What will be an ideal response?
A resistor and an inductor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to
A) 25% of the original value. B) 37% of the original value. C) 50% of the original value. D) 63% of the original value. E) 75% of the original value.
Hybrid vehicles run on
A. electric and solar power B. solar power and gasoline C. electric power and gasoline D. nuclear power and gasoline
When water changes to ice, energy is _______.
a. released by the water b. changed to a different form c. absorbed by the water d. None of the answers is correct.