When a cannon fires a cannonball at a given speed, the smaller recoil speed of the cannon is due to differences in
A) forces.
B) times.
C) masses.
D) momenta.
Answer: C
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A heat pump can
A) cool an environment. B) warm an environment. C) both of these D) neither of these
What is the energy released for the reaction where the products are 0.0051 u less than the reactants? (1 u = 931.5 MeV/c2)
a. 7.6 MeV c. 4.8 MeV b. 5.2 MeV d. 8.5 MeV
Magnifying Glass With the Image at Infinity: A magnifying glass has a focal length of 7.0 cm. What is the angular magnification if the image is viewed by a person having a relaxed eye with the near point of 25 cm?
A. 1.6 B. 2.6 C. 3.6 D. 4.6
As more resistors are added in series to a constant voltage source, the power supplied by the source
A) increases. B) decreases. C) does not change. D) increases for a time and then starts to decrease.