The process of _______________ depends partly on the presence of short-lived radioactive elements whose rapid decay would have released enough heat to melt the interior of planets
Fill in the blank(s) with correct word
differentiation
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If the mass of a cart is quickly loaded to have twice the mass while a propelling force remains constant, the cart's acceleration
A) quadruples. B) doubles. C) stays the same. D) halves. E) none of these
A plot of the continuous spectra of five different stars is shown in the figure. Based on these spectra, which of the stars is the hottest?
a. Star A
b. Star B
c. Star C
d. Star D
e. Star E
The rings around Uranus and Neptune are confined by shepherd satellites
a. True b. False Indicate whether the statement is true or false
Magnetic Field of a Long Wire: A long straight wire has a constant current flowing to the right. A rectangular metal loop is situated above the wire, and also has a constant current flowing through it, as shown in the figure. Which one of the following statements is true? 
A. The net magnetic force on the rectangle is upward, and there is also a nonzero torque on the rectangle. B. The net magnetic force on the rectangle is zero, and the net torque on it is zero. C. The net magnetic force on the rectangle is downward, and there is also a nonzero torque on the rectangle. D. The net magnetic force on the rectangle is zero, but there is a nonzero torque on the rectangle. E. The net magnetic force on the rectangle is downward, and the net torque on it is zero.