An instructor fires an arrow into a wooden block suspended by strings, as shown. If the mass of the arrow is 1/10 the mass of the block, what is the momentum of the arrow relative to the momentum of the block after the arrow has fully penetrated the block and is moving with it?
a. The same.
b. The momentum of the arrow is 1/10 that of the block.
c. The momentum of the arrow is ten times that of the block.
d. The momentum of the arrow is 100 times that of the block because the kinetic energy is ½mv2.
e. The momentum of the arrow is 1/100 times that of the block because the kinetic energy is ½mv2.
b
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What is the voltage drop across a 5.0-? resistor if the current through it is 5.0 A?
A) 100 V B) 25 V C) 4.0 V D) 1.0 V
Several resistors are connected in series. Which of the following statements is correct? Choose all that are correct
1.The equivalent resistance is greater than any of the resistances in the group. 2.The equivalent resistance is less than any of the resistances in the group. 3.The equivalent resistance depends on the voltage applied across the group. 4.The equivalent resistance is equal to the sum of the resistances in the group. 5.None of those statements is correct.
Which of the following is true of Phobos?
A) It is bigger than Mars. B) It is almost certainly a captured asteroid. C) Its gravitational acceleration is equivalent to that of Earth. D) Its atmosphere is completely made of nitrogen.
If you place a plane mirror vertically into water, and a dolphin moves toward it with a speed of 4 m/s, she will see her image move toward her at a relative speed of
A) 6. m/s. B) 10. m/s. C) 2. m/s. D) 4. m/s. E) 8. m/s.