Potential energy may be positive or negative
Indicate whether the statement is true or false
TRUE
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A cannon recoils while firing a cannonball. The speed of the cannon's recoil is relatively small because the
A) force against the cannon is smaller than against the ball. B) momentum is mainly concentrated in the cannonball. C) cannon has much more mass than the cannonball. D) momentum of the cannon is smaller.
Of the main types of radiation emitted from naturally radioactive isotopes, which of the following is the most penetrating?
a. alpha b. beta (electron) c. gamma d. beta (positron)
The amount of energy equivalent to one kilogram of mass at rest is
A) 9.0 × 1016 J. B) 3.0 × 108 J. C) 4.5 × 1016 J. D) 6.0 × 10-3 eV. E) 1.2 × 108 eV.
Photon Energy: An 84-kW AM radio station broadcasts at 1000 kHz. How many photons are emitted each second by the transmitting antenna? (h = 6.626 × 10-34 J ? s)
A. 1.3 × 1032 B. 2.9 × 1024 C. 6.3 × 1012 D. 1.4 × 1015