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A year ago
The impulse experienced by a body is equivalent to its change in:
 a. velocity.
  c. momentum.
  b. kinetic energy.
  d. None of the other choices are valid.

[Ques. 2] A proton initially moves left to right long the x axis at a speed of 2.00  104 m/s. It moves into an electric field, which points in the negative x direction, and travels a distance of 0.200 m before coming to rest. What acceleration magnitude does the proton experience?
 a. 2.67  1012 m/s2
  c. 6.67  106 m/s2
  b. 9.33  109 m/s2
  d. 1.00  109 m/s2

[Ques. 3] A 75-kg swimmer dives horizontally off a 500-kg raft. The diver's speed immediately after leaving the raft is 1.6 m/s. A microsensor system attached to the edge of the raft measures the time interval during which the diver applies an impulse to the raft just prior to leaving the raft surface. If the time interval is read as 0.20 s, what is the magnitude of the average horizontal force by diver on the raft?
 a. 900 N
  c. 600 N
  b. 450 N
  d. 1500 N

[Ques. 4] Two point charges are placed along a horizontal axis with the following values and positions: +3.0 C at x = 0 cm and -6.0 C at x = 20 cm. At what point along the x axis is the electric field zero?
 a. 8.0 cm
  c. -38 cm
  b. -48 cm
  d. -69 cm

[Ques. 5] The dimensional equivalent of the quantity impulse in terms of the fundamental quantities (mass, length, time) is which of the following?
 a. MLT
  c. MLT-1
  b. ML2T-2
  d. MLT-2

[Ques. 6] The average distance of the electron from the proton in the hydrogen atom is 0.51  10-10 m. What is the electric field from the proton's charge at the location of the electron? (ke = 8.99  109 Nm2/C2, e = 1.6  10-19 C)
 a. 8.8  10-8 N/C
  c. 3.2  102 N/C
  b. 1.0  106 N/C
  d. 5.5  1011 N/C

[Ques. 7] In an automobile collision, how does an airbag lessen the blow to the passenger? Assume as a result of the collision, the passenger stops.
 a. The airbag decreases the momentum change of the passenger in the collision.
  b. During the collision, the force from the airbag is greater than the force from the windshield or dashboard, so the passenger cannot hit the hard objects.
  c. The stopping impulse is the same for either the hard objects or the airbag. Unlike the windshield or dashboard, the airbag gives some, increasing the time for the slowing process and thus decreasing the average force on the passenger.
  d. The airbag is there to ensure the seatbelt holds.

[Ques. 8] Charges of 4.0 C and -6.0 C are placed at two corners of an equilateral triangle with sides of 0.20 m. At the third corner, what is the electric field magnitude created by these two charges? (ke = 8.99  109 Nm2/C2)
 a. 3.1  106 N/C
  c. 4.8  106 N/C
  b. 1.2  106 N/C
  d. 4.5  106 N/C

[Ques. 9] A rock is moving with speed v. If the mass of the rock were tripled and the speed were reduced to v/3, which of the following statements would be true?
 a. The kinetic energy of the rock is smaller than in the first case, but the momentum is larger.
  b. The kinetic energy of the rock is smaller than in the first case, but the momenta of both are the same.
  c. The kinetic energies of the rocks are the same in both cases.
  d. The kinetic energy of the rock is 1/9 its previous value.

[Ques. 10] An electron with a charge value of 1.6  10-19 C is moving in the presence of an electric field of 300 N/C. What force does the electron experience?
 a. 2.3  10-22 N
  c. 6.4  10-17 N
  b. 4.8  10-17 N
  d. 1.9  10-21 N
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A year ago
1)  C

2)  D

3)  C

4)  B

5)  C

6)  D

7)  C

8)  B

9)  B

10)  B

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A year ago
This is very helpful, my teacher this year is not good
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