If an unbalanced force applied to an object doubles, then
A. its acceleration is cut in half
B. its acceleration doubles
C. its velocity doubles
D. its acceleration increases by a factor of four
Answer: B. its acceleration doubles
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If work is done on a system by non-conservative forces, the total mechanical energy of a system stays constant
Indicate whether the statement is true or false
A steel pipe (E 5 190 GPa, ? 5 14 3 1026/°C, d2 5 82 mm) of length L 5 4.25 m hangs from a rigid surface and is subjected to a temperature increase ?T 5 50 °C. The column is fixed at the top and has a small gap at the bottom. To avoid buckling, the minimum clearance at the bottom should be approximately:
(A) 2.55 mm
(B) 3.24 mm
(C) 4.17 mm
(D) 5.23 mm
Why would a decrease in the amount of ozone in the atmosphere increase the likelihood of people getting sunburn?
a. Global temperatures would rise b. More ultraviolet radiation would reach the ground c. People would be exposed to more infrared radiation d. The premise is incorrect. Ozone and sunburn are not related
The special theory of relativity predicts that there is an upper limit to the speed of an object
It therefore follows that there is also an upper limit on which of the following properties of the object? (There could be more than one correct choice) A) The kinetic energy of the object. B) The total energy of the object. C) The linear momentum of the object. D) None of the above.