At the lower left of the Hertzprung—Russell diagram we find
A) supergiant stars
B) red giant stars
C) white dwarfs
D) main sequence stars
C
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Coulomb's Law: Two small identically charged balls are a certain distance apart. The vectors in the figure show the magnitude and direction of the electrostatic force on each ball due to the other one. Suppose that the charge on the left ball is now doubled (represented by two plus signs). Which vector diagram below best represents the forces that now act on each of the two balls?
A. 
B. 
C. 
D. 
You and your surfing buddy are waiting to catch a wave a few hundred meters off the beach
The waves are conveniently sinusoidal, and you notice that when you're on the top of one wave and moving toward your friend, she is exactly halfway between you and the trough of the wave. 1.50 seconds later, your friend is at the top of the wave. You estimate the horizontal distance between you and your friend at 8.00 m. (a) What is the frequency of the waves? (b) Find the speed of the waves. What will be an ideal response?
What is the radius of the smallest electron orbit in a singly-ionized helium atom?
A) 1.06 × 10-10 m B) 1.32 × 10-11 m C) 5.29 × 10-11 m D) 2.65 × 10-11 m
The horizontal surface on which the objects slide is frictionless. If M = 2.0 kg, the tension in string 1 is 12 N. Determine F
a.
25 N
b.
20 N
c.
30 N
d.
35 N
e.
40 N