Black holes suck up all matter in sight
Indicate whether the statement is true or false
FALSE
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You ride on an elevator that is moving upward with constant speed while standing on a bathroom scale. The reading on the scale is
A) equal to your true weight, mg. B) more than your true weight, mg. C) less than your true weight, mg. D) zero. E) could be more or less than your true weight, mg, depending on the value of the speed.
The radius of the Earth is r. A satellite of mass 100 kg is at a point 3r above the Earth's surface. What is the satellites' weight?
A. 6.3 N B. 110 N C. 61 N D. 38 N
Which of the following statements about thermal radiation is always true?
A) A hot object emits more radiation per unit surface area than a cool object. B) A cold object produces more total infrared and radio emission per unit surface area than a hot object. C) A hot object produces more total infrared emission than a cooler object. D) All the light emitted by hot object has higher energy than the light emitted by a cooler object.
Suppose that the three fundamental standards of the metric system were length, density, and time rather than length, mass, and time. The standard of density in this system is to be defined as that of water. Which of the following are among the considerations about water that you would need to address to make sure that the standard of density is as accurate as possible?
(i) That the amount of water is at some defined value. (ii) That the pressure of the water is at some defined value. (iii) That the temperature of the water is at some defined value. (iv) That the water is pure.
1.(ii), (iii) and (iv) 2.(i) only 3.all four 4.(i), (ii), and (iii)