The particle that orbits the central core inside an atom is the
a. electron
b. proton
c. neutron
d. nucleus
e. none of the above
A
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Equilibrium: Two blocks, A and B, are being pulled to the right along a horizontal surface by a horizontal 100-N pull, as shown in the figure. Both of them are moving together at a constant velocity of 2.0 m/s to the right, and both weigh the same. 
Which of the figures below shows a correct free-body diagram of the horizontal forces acting on the upper block, A?
A. 
B. 
C. 
D. 
E. 
Which of the following is not a piece of evidence supporting the idea that Europa may have a subsurface ocean?
A) Astronomers have detected small lakes of liquid water on Europa's surface. B) Europa has a magnetic field that appears to be induced by Jupiter's magnetic field. C) Photos of Europa's surface show regions that appear to consist of jumbled icebergs frozen in place. D) Europa's surface shows few impact craters.
As a star's temperature increases, the frequency of peak emission also increases
Indicate whether the statement is true or false
A rocket obeys the principles of recoil. However, it is much more difficult to apply Newton's second law to a rocket because
A. there is actually sideways momentum, because a rocket motor is just a well-controlled explosion. B. the rocket pushes against air but the air is a fluid. C. Newton's three laws do not apply in outer space. D. as the rocket motor fires the total mass of the rocket changes.