In an isolated system of two bodies that exert gravitational forces on one another, the quantity (quantities) that remain(s) constant is(are)
a. the total energy of the system.
b. the total angular momentum of the system.
c. the angular positions of the two bodies.
d. all of the above.
e. only (a) and (b) above.
e
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Multiple the equation for linear momentum by radial distance r and you have
A) rotational kinetic energy. B) angular momentum. C) rotational inertia.
Each of two small non-conducting spheres is charged positively, the combined charge being 40 ?C. When the two spheres are 50 cm apart, each sphere is repelled from the other by a force of magnitude 2.0 N. Determine the magnitude of the smaller of the two charges
a. 1.4 ?C b. 1.1 ?C c. 2.0 ?C d. 3.3 ?C e. 17 ?C
A spaceship is moving away from the earth with a constant speed of 0.80c. The spaceship fires a 28-kg missile with a speed of 0.50c relative to the spaceship
What is the speed of the missile measured by observers on the earth if the missile is fired (a) away from the earth? (b) toward the earth?
Energy Levels: What is the wavelength of the emitted photon if an electron in the hydrogen atom makes a transition from the n = 7 state to the n = 2 state? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 199 nm B. 365 nm C. 4480 nm D. 398 nm E. 796 nm