A 40-kg box is being pushed along a horizontal smooth surface. The pushing force is 15 N directed at an angle of 15° below the horizontal. What is the magnitude of the acceleration of the crate?
A) 0.16 m/s2
B) 0.36 m/s2
C) 0.47 m/s2
D) 0.39 m/s2
E) 0.68 m/s2
B
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________ is the most important quality of an astronomical telescope.
A. Magnification B. Rigidity C. Ability to see at night D. Resolving power
What is the accepted explanation for millisecond pulsars?
What will be an ideal response?
The energy difference between adjacent orbit radii in a hydrogen atom
A) decreases with increasing values of n. B) increases with increasing values of n. C) remains constant for all values of n. D) varies randomly with increasing values of n.
Bohr's model explains the absorption spectrum as the result of:
a. the specific jumps downward in energy that an electron has available in an unexcited atom. b. the specific jumps downward in energy that an electron has available in an unexcited atom. c. the specific jumps upward in energy that an electron has available in an unexcited atom. d. the specific jumps upward in energy that an electron has available in an excited atom. e. how an electron sometimes absorbs a photon when dropping to a lower level instead of emitting one.