As I pull a rope connected to a box at constant speed up a frictionless slope, pulling parallel to the slope, the tension in the rope will be:
a. greater than the tension would be if the box were stationary.
b. greater than the weight of the box.
c. equal to the weight of the box.
d. less than the weight of the box.
D
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Consider two cylinders of gas identical in all respects except that one contains oxygen O2 and the other helium He. Both cylinders initially contain the same volume of gas at 0°C and 1 atm of pressure and are closed by a movable piston at one end
Both gases are now compressed adiabatically to one-third their original volume. (a) Which gas will show the greater temperature increase? 1. the O2 2. the He 3. Neither; both will show the same increase. 4. It is impossible to tell from the information given. (b) Which gas will show the greater pressure increase? 1. the O2 2. the He 3. Neither; both will show the same increase. 4. It is impossible to tell from the information given.
According to general relativity, it is impossible to distinguish between an accelerated frame of reference and ________.
What will be an ideal response?
Radioactive Decay: The decay constant of a radioactive isotope is 1.60 × 10-3 s-1. At a given instant, the number of atoms of the radioactive isotope is 1.85 × 1012. How many atoms of the isotope remain after a time interval of 30.0 minutes?
A. 1.04 × 1011 B. 1.14 × 1011 C. 1.26 × 1011 D. 1.38 × 1011 E. 1.52 × 1011
A uniform pressure of 21 × 10^5 N/m2 is applied to all six sides of a copper cube. What is the percentage change in volume of the cube? (for copper, B = 14 × 10^10 N/m2)
a. 2.4 × 10^-2 % c. 8.4 × 10^-2 % b. 1.5 × 10^-3 % d. 0.5 × 10^-3 %