About what fraction of the initial activity of a radioactive source remains after 10 half-lives?
a. 1.0 × 10^–10 b. 9.8 × 10^–4
c. 5.0 × 10^–2 d. 3.9 × 10^–3
b
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A solid sphere of mass 2.50 kg and radius 0.120 m is at rest at the top of a ramp inclined 15.0°. It rolls to the bottom without slipping. The upper end of the ramp is 1.20 m higher than the lower end. Find the sphere's total kinetic energy when it reaches the bottom
a. 70.0 J b. 47.9 J c. 29.4 J d. 8.80 J
Which stellar population has highly elliptical orbits?
a. Pop I extreme b. Pop I intermediate c. Pop II intermediate d. Pop II extreme
For an astronaut working outside a spaceship, the greatest loss of heat would occur by means of
a. conduction. b. convection. c. radiation. d. conduction and convection. e. conduction and radiation.
A point charge of +3.0 mC is located at the origin of a coordinate system and a second point charge of -9.0 mC is at x = 1.00 m. What is the electric potential at the x = 0.50 m point? (ke = 8.99 × 10^9 N×m2/C2)
a. -5.4 × 10^4 V c. 16 × 10^4 V b. 11 × 10^4 V d. -11 × 10^4 V