The force of gravity acts on a satellite when it is in
1) circular orbit.
2) elliptical orbit.
3) both of these
4) neither of these
and does work on a satellite when it is in
5) circular orbit.
6) elliptical orbit.
7) both of these
8) neither of these
Answer: 3, 6
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The property of growth and development appears to be
A) a necessary condition, but not a sufficient condition for life B) a sufficient condition, but not a necessary condition for life C) both a necessary condition and a sufficient condition for life D) neither a necessary condition nor a sufficient condition for life
We never find isolated, individual quarks because
A) quarks immediately undergo radioactive decay when they are separated. B) quarks are bound tightly together by neutrinos. C) quarks are always attached to electrons. D) the force between quarks is infinitely strong so they cannot be budged. E) whenever quarks are separated, the energy created by the separation creates new quark pairs.
One mole of hydrogen, one mole of nitrogen and one mole of oxygen are held in a 22.4 × 10^3 cm3 enclosed vessel at 20°C. The pressure in the vessel, in N/m2, is
a. 109. b. 304. c. 326. d. 1.09 × 10^5. e. 3.26 × 10^5.
A projectile is launched straight upward at 50 m/s. Neglecting air resistance its speed upon returning to its starting point is
A) less than 50 m/s. B) 50 m/s. C) more than 50 m/s.