When a crate slides down an incline at a constant velocity it is
A) in dynamic equilibrium.
B) not in dynamic equilibrium.
C) in a state of being in and out of dynamic equilibrium.
D) none of the above
Answer: A
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Lithospheric plates move in response to
A) convection in Earth's interior. B) upper mantle convection cells. C) gravity and heat flow in the mantle. D) convection cells generated by gravity and heat flow in the mantle.
General Questions: A 20-ton truck collides with a 1500-lb car. Which of the following statements must be true?
A. During the collision, the force on the truck is greater then the force on the car. B. During the collision, the force on the truck is equal to the force on the car. C. During the collision, the force on the truck is smaller than the force on the car. D. The truck did not slow down during the collision, but the car did. E. The car did not slow down during the collision, but the truck did.
If a star were moved 10 times farther away, its apparent magnitude would drop by five magnitudes
Indicate whether the statement is true or false
Two wires, each carrying current I, are antiparallel to each other. The two wires
A. repel each other. B. attract each other. C. are not affected by each other.