Mars' magnetic field is so weak because:
A) it spins much slower than Earth does.
B) it core may no longer be molten.
C) its core contains less iron than our own.
D) Both B and C are probable.
E) All of the above are correct.
D
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Conservation of Momentum: Consider two less-than-desirable options. In the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. In the second option you are driving 30 mph and crash head-on into a stationary brick wall. In neither case does your car bounce back from the thing it hits, and the collision time is the same in both cases. Which of these two situations would result in the greater impact force on your car?
A. hitting the other car B. hitting the brick wall C. The force would be the same in both cases. D. None of these choices are correct.
If a = 3.0 mm, b = 4.0 mm, Q1 = 60 nC, Q2 = 80 nC, and q = 32 nC in the figure, what is the magnitude of the electric force on q?
A. 1.6 N B. 1.3 N C. 1.9 N D. 2.2 N E. 0.040 N
You are holding your physics book, pushing upwards on it with the palm of your hand. The reaction to this force is the force on __________ by __________
Fill in the blank(s) with correct word
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