To find the ________ velocity, we must combine proper motion and parallax data
Fill in the blank(s) with correct word
transverse
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Astronomers often record solar images in the ____ part of the electromagnetic spectrum because the gaseous layers high in the Sun's atmosphere are very hot and emit most of their light at short wavelengths
a. microwave b. gamma c. visible light d. ultraviolet e. infrared
The magnetic field in a region of space is parallel to the surface of a long flat table. Imagine that this page is lying flat on the table. When current is present in the coil, which is lying on the table, the coil tends to rotate so that the left side moves up and the right side moves down. The magnetic field is
A. directed parallel to the page and downwards. B. directed parallel to the page and upwards. C. directed parallel to the page and to the right. D. directed parallel to the page and to the left. E. in a direction that cannot be determined in this experiment
Two charged bodies separated by a distance d exert an electrical force on each other. The distance d is doubled. The electrical force on each body now
a. decreases by 1/4. b. decreases by 1/2. c. stays the same. d. increases by 2 times. e. increases by 4 times.
A tennis player wants to slam a serve at O so that the ball lands just inside the opposite corner of the court. What should the ratio
be for the initial velocity 
? The time t = 0 is the time when the ball is hit by the racket.
?
?
a.
W/L
b.
L/W
c.
d.
e.