A catcher arranges to catch a baseball dropped from a height 50 m above his glove. However, his friends substitute a soft 250 g red grapefruit, so that it will smash apart when he catches it. His glove stops the grapefruit in 0.010 s. What force does the glove exert on the grapefruit?
a.
0.078 3 N
b.
783 N
c.
2 450 N
d.
24 500 N
e.
78 300 N
b
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The atmosphere of Titan is chiefly
A) ammonia. B) nitrogen. C) oxygen. D) methane. E) hydrogen.
A 1.5-kg block sliding on a rough horizontal surface is attached to one end of a horizontal spring (k = 200 N/m) which has its other end fixed. If this system is displaced 20 cm horizontally from the equilibrium position and released from rest, the block first reaches the equilibrium position with a speed of 2.0 m/s. What is the coefficient of kinetic friction between the block and the horizontal
surface on which it slides? a. 0.34 b. 0.24 c. 0.13 d. 0.44 e. 0.17
The Pauli exclusion principle tells us that no two electrons in an atom can have the same quantum number(s)
A) n, ?, m?, and ms. B) n, ? and m?. C) m? and ms. D) n and ?. E) n.
For n = 5, how many allowed values are possible for the orbital quantum number and the orbital magnetic quantum number?
a. 5, 11 c. 5, 9 b. 6, 12 d. 4, 9