In noting that the Earth is "differentiated," we mean that
A) the density increases as you descend downward toward the core.
B) the Earth's magnetic field varies at different locations on the globe.
C) the Earth is very different than any other planet we study.
D) the radioactive heating in the core is increasing with time.
E) the density of oceanic basalt is less than that of granite on the mountain tops.
A
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When a nucleus undergoes alpha decay, the daughter element always has
A. more electrons than the parent. B. less charge than the parent. C. more neutrons than the parent. D. the same atomic number as the parent.
Self-Inductance: A coil with a self-inductance of 6.0 H has a constant current of 2.0 A flowing through it for 2.0 s. What is the emf induced in this coil?
A. 6.0 V B. 12 V C. 0.0 V D. 4.0 V E. 8.0 V
A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the car. During the collision
A) the force on the truck due to the collision is slightly greater than the force on the car. B) the force of on the truck due to the collision is exactly equal to the force on the car. C) the force on the car due to the collision is much greater than the force on the truck. D) the car and the truck have the same magnitude acceleration.
A string is stretched with a tension of 120 N. The string has a length of 2.5 meters. The velocity of wave propagation along the string is 220 m/s. The mass per unit length of the string is
a. 
b. 
c. 
d. 
e. 