Describe the fate of planet Earth if the Sun were to collapse to a black hole
What will be an ideal response?
Answer: First of all, the orbit of the Earth would be no different for it would be circling the same mass either way. The mass of the Sun would be no different collapsed. But the energy the Sun presently provides would not be there. Earth would be a very dark and cold place, and the Sun would no longer sustain Earthly life.
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A 10-kg rock and a 20-kg rock are dropped at the same time and there is no air. If the 10-kg rock falls with acceleration a, what is the acceleration of the 20-kg rock?
A) 4a B) 2a C) a D) a/2 E) a/4
Work: Matthew pulls his little sister Sarah along the horizontal ground in a wagon. He exerts a force on the wagon of 60.0 N at an angle of 37.0° above the horizontal. If he pulls her a distance of 12.0 m, how much work does Matthew do?
A. 185 J B. 433 J C. 575 J D. 720 J
The peak of the radiation curve of a blackbody moves toward larger wavelength as its temperature increases
Indicate whether the statement is true or false
A disk and a hoop of the same mass and radius are released at the same time at the top of an inclined plane. If both are uniform, which one reaches the bottom of the incline first if there is no slipping?
A) The hoop B) The disk C) Both reach the bottom at the same time.