Which of the following is not true?
1.If the average velocity of a particle over some interval is equal to zero, the instantaneous velocity of the particle over that interval may not be equal to zero at any time during the interval.
2.The instantaneous velocity of a particle can be less than its average velocity.
3.The instantaneous velocity of a particle can be greater than its average velocity.
4.If the average velocity of a particle over some interval is equal to zero, the instantaneous velocity of the particle over that interval must be equal to zero at some time during the interval.
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Motion of the plates of Earth's crust is thought to be due to
a. the solar wind. b. convection from the hot interior. c. tides in the oceans. d. friction between wind and the land surface. e. Earth's magnetic field.
An apple and an orange are connected by a straw of negligible mass. If the centers of the apples are 26 cm apart and the center of mass of the pair is 11 cm from the apple, what is the ratio of mapple to m orange?
A. 26/11 B. 11/15 C. 15/26 D. 11/26 E. 26/15 F. 15/11
An electron moves with a speed of 8.0 × 106 m/s along the +x-axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60° to the +x-axis and lying in the x-y plane
Calculate the magnitude of the magnetic force on the electron. A) 2.8 × 10-10 N B) 3.2 × 10-10 N C) 2.8 × 10-12 N D) 3.2 × 10-12 N E) 0 N
Thrust a magnet into a coil of wire and you'll induce
A) voltage. B) current. C) both of these D) none of the above