A(n) ________ galaxy is the result of the collision and merger of galaxies that leave little cold gas remaining in the system.
A. spiral
B. barred spiral
C. elliptical
D. irregular
Answer: C
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Out of the five common rock-forming minerals (silicates, carbonates, oxides, sulfides, and sulfates), which two form economically important ores?
What will be an ideal response?
Shell Radius: Consider the Bohr model for the hydrogen atom in its second excited state.(a) Determine the binding energy (eV) of the electron.(b) What is the radius of the electron orbit, given that r1 = 0.0529 nm?(c) How far is it from the next higher excited orbit?
What will be an ideal response?
A small block of mass m can slide along the frictionless loop-theloop. The block is released from rest at point P, at height h = 5R above the bottom of the loop. How much work does the gravitational force do on the block as the block travels from point P to
(a) point Q and
(b) the top of the loop?
If the gravitational potential energy of the block–Earth system is taken to be zero at the bottom of the loop, what is that potential energy when the block is
(c) at point P,
(d) at point Q, and
(e) at the top of the loop?
(f) If, instead of being released, the block is given some initial speed downward along the track, do the answers to (a) through (e) increase, decrease, or remain the same?
The Shroud of Turin, the Iceman, and the Dead Sea Scrolls were dated by use of
a. Rubidium-87. b. Potassium-40. c. Carbon-14. d. Uranium-238.