Which is the strongest fundamental force?
A) gravitational force.
B) electric force.
C) nuclear strong force.
D) none of the above
Answer: C
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Kinetic Energy: An electron has a relativistic momentum of 1.1 × 10-21 kg ? m/s. What percent of its total energy is its kinetic energy? (melectron = 9.11 ×10-31 kg, c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).
The numbers 9.81×10^5 and 981,000 are equivalent
a. True b. False Indicate whether the statement is true or false
Compared to our Sun, a typical white dwarf has
A) about the same mass and density. B) about the same mass and a million times higher density. C) a larger mass and a 100 times lower density. D) a smaller mass and half the density. E) a smaller mass and twice the density.
A deep space probe moving forward in space needs to make a course correction and so fires a thruster on the side of the probe 90° away from its direction of motion, as shown below. This thruster, while on, exerts a constant force on the probe perpendicular to its original direction of motion. While the thruster is operating, which trajectory best describes the probe’s motion? (Hint: Note that the thrust force delivers an upward impulse to the probe during every successive time interval. Consider what happens to the ball in figure C2.4 as it receives analogous continual downward impulses.)
A. A
B. B
C. C
D. D
E. E