Velocity: Consider a car that travels between points A and B. The car's average speed can be greater than the magnitude of its average velocity, but the magnitude of its average velocity can never be greater than its average speed.
A. True
B. False
Answer: A
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Suppose that we wish to find the "net force" on an automobile, in order to apply Newton's law of motion to the motion of the automobile
As part of the net force, do we need to include "internal frictional forces" due to internal gears, bearings, etc.? A) Yes, because of Newton's law of force pairs. B) No, because only external forces need to be included. C) Yes, because every internal and external force must be included. D) No, because only the drive force needs to be included. E) Yes, because these forces dissipate some of the car's energy.
An electron in an x-ray machine is accelerated through a potential difference of 1.00 × 10^4 V before it hits the target. What is the kinetic energy of the electron in electron volts?
1.1.00 × 10^4 eV 2.1.60 × 10^-15 eV 3.1.60 × 10^-22 eV 4.6.25 × 10^22 eV 5.1.60 × 10^-19 eV
A parachutist of mass 50.0 kg jumps out of an airplane at a height of 800 m. The parachute deploys, and she lands on the ground with a speed of 5.0 m/s. How much energy was lost to air friction during this jump?
a. 49,400 J c. 391,000 J b. 98,700 J d. 489,000 J
Equilibrium: A uniform rod weighs 40 N and is 1.0 m long. It is hinged to a wall at the left end, and held in a horizontal position at the right end by a vertical string of negligible weight, as shown in the figure. What is the magnitude of the torque due to the string about a horizontal axis that passes through the hinge and is perpendicular to the rod? The hinge is very small with negligible friction.
A. 40 N ? m B. 10 N ? m C. 5.0 N ? m D. 20 N ? m E. 30 N ? m