General Questions: An elevator suspended by a vertical cable is moving downward but slowing down. The tension in the cable must be
A. greater than the weight of the elevator.
B. less than than the weight of the elevator.
C. equal to the weight of the elevator.
Answer: A
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Components: When rolled down a mountainside at 7.0 m/s, the horizontal component of its velocity vector was 1.8 m/s. What was the angle of the mountain surface above the horizontal?
A. 75° B. 57° C. 33° D. 15°
When an artery gets a constricted region due to plaque, how does the pressure in this region compare to the pressure in an unconstricted region adjacent?
a. Since this is a closed system, the pressure is the same in both regions. b. In the constricted region the blood moves at a higher speed than in the unconstricted region resulting in an increased pressure. c. In the constricted region the blood moves at a higher speed than in the unconstricted region resulting in a decreased pressure. d. In the constricted region the blood moves at a lower speed than in the unconstricted region resulting in an increased pressure.
In a mass spectrometer, a singly-charged particle (charge e) has a speed of 1.0 × 106 m/s and enters a uniform magnetic field of 0.20 T. The radius of the circular orbit of the particle is 0.020 m
What is the mass of this particle? (e = 1.60 × 10-19 C) A) 3.2 × 10-28 kg B) 6.4 × 10-28 kg C) 1.7 × 10-27 kg D) 4.5 × 10-27 kg E) 3.1 × 10-31 kg
If bits of the coals do not stick to your feet while walking barefoot on red-hot coals, it would be best if your feet are
A) wet. B) dry. C) warm. D) cold. E) very hot.