What is the primary reason that astronomers suspect that some jovian moons were captured into their current orbits?
A) Some moons have a composition that differs from the composition of the planets.
B) Astronomers have observed moons being captured.
C) Some moons are surprisingly large in size.
D) Some moons have orbits that are "backwards" (compared to their planet's rotation) or highly inclined to their planet's equator.
D
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Equilibrium: As shown in the figure, a woman is straining to lift a large crate, but without success because it is too heavy. We denote the forces on the crate as follows: P is the magnitude of the upward force being exerted on the crate by the person, C is the magnitude of the vertical contact force on the crate by the floor, and W is the weight of the crate. How are the magnitudes of these forces related while the person is trying unsuccessfully to lift the crate?
A. P + C = W B. P + C < W C. P + C > W D. P = C
The two principal agents of metamorphism are heat and ______________
Fill in the blank(s) with correct word
If the voltage across a circuit element has its maximum value when the current in the circuit is zero, which of the following statements must be true?
1.The circuit element is a resistor. 2.The circuit element is a capacitor. 3.The circuit element is an inductor. 4.The current and voltage are 90° out of phase. 5.The current and voltage are 180° out of phase.
Suppose a particle is being accelerated through space by a 10-N force. Suddenly the particle encounters a second force of 10 N in the opposite direction. The particle with both forces acting
A) is brought to a rapid halt. B) decelerates gradually to a halt. C) continues at the speed it had when it encountered the second force. D) theoretically tends to accelerate toward the speed of light. E) none of the above