At the Earth's surface, approximately 1000 W/m2 is present due to solar radiation. If 1390 W are incident upon a 1.0 m x 1.5 m window in a vertical, south-facing wall at this time, what is the angle with respect to the vertical of the sun’s rays?
A. 
B. 
C. 
D. 
E. 
F. 
B.
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When a rigid body rotates about a fixed axis all the points in the body have the same angular acceleration
Indicate whether the statement is true or false
A 6.5-g iron meteor hits the earth at a speed of 295 m/s. If its kinetic energy is entirely converted to heat in the meteor, by how much will its temperature rise? The specific heat of iron is 113 cal/kg ? C°, and 1 cal = 4.186 J
A) 92.0 C° B) 57,100 C° C) 0.147 C° D) 384 C°
If, in a parallel universe, ? has the value 3.14149, express ? in that universe to four significant figures
A) 3.141 B) 3.142 C) 3.1415 D) 3.1414
We see other galaxies moving away from us because:
a) We are at the center of an ancient explosion called the big bang that sent matter hurtling through space in all directions. b) Space itself is expanding so that observers in any galaxy see other galaxies moving away from them. c) Other galaxies are repelled by the black hole at the center of ours.