An isolated black hole in space would be difficult to detect because
a. there would be no light source nearby.
b. it would not be rotating rapidly.
c. it would be stationary.
d. very little matter would be falling into it.
e. there would be very few stars behind it whose light the black hole could block out.
d
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The force acting on an object is given by Fx = (5x – 10) N, where x is in meters. What is the net work done by the force as the object moves from x = 0 to x = 4.50?
a. 5.6 J b. 15.6 J c. 12.5 J d. 11.3 J
Consider a car with its wheels rolling (not sliding) on the road. How fast must the auto move for some point on a wheel to reach the speed of sound? Explain
What will be an ideal response?
A 0.28-kg stone you throw rises 34.3 m in the air. The impulse your hand receives from the stone while it throws the stone is
a. 2.7 N s, up. b. 2.7 N s, down. c. 7.3 N s, up. d. 7.3 N s, down. e. 9.6 N s, up.
The Sun is gradually increasing in brightness as it ages. Why isn't this considered to be an explanation for global warming?
A) A change in the Sun's brightness would not be expected to have any effect on Earth's average temperature. B) The scientists are covering up this potentially valid explanation. C) The amount of energy the Earth receives from the Sun remains constant regardless of what the Sun does. D) The Sun is increasing in brightness much too slowly to be causing the current warming.