In one-dimensional motion, the average speed of an object that moves from one place to another and then back to its original place has which of the following properties?
a. It is positive.
c. It is zero.
b. It is negative.
d. It can be positive, negative, or zero.
A
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Seen from the northern latitudes (mid-northern hemisphere), the star Polaris
a. is never above the horizon during the day. b. always sets directly in the west. c. is always above the northern horizon. d. is never visible during the winter. e. is the brightest star in the sky.
In addition to asteroids, ________ impacts also provided the primitive Earth with water and organics
Fill in the blank(s) with correct word
A beam of X-rays of different frequencies is reflected at 10 degrees off a crystal of interatomic spacing 0.2 nm. Which X-ray wavelength is preferentially reflected?
a. 0.0943 nm b. 0.139 nm c. 0.0695 nm d. 1.02 × 10^?10 m e. 3.47 × 10^?11 m
Parallel-Plate Capacitor: An ideal air-filled parallel-plate capacitor with horizontal plates has a plate separation of 5.0 cm. If the potential difference between the plates is 2000 V, with the top plate at the higher potential, what are the magnitude and direction of the electric field between the plates?
A. 100 N/C upward B. 100 N/C downward C. 40,000 N/C upward D. 40,000 N/C downward