A spaceship approaches the earth with a speed 0.50 c. A passenger in the spaceship measures his heartbeat as 70 beats per minute. What is his heartbeat rate according to an observer that is at rest relative to the earth?
A)
69 beats per minute
B)
73 beats per minute
C)
65 beats per minute
D)
61 beats per minute
E)
80 beats per minute
D
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As Earth _______________ on its axis, it produces the cycle of day and night
Fill in the blank(s) with correct word
Jupiter puts back into space twice the energy it gets from the Sun
Indicate whether the statement is true or false
Who first noticed that for Cepheid variable stars, there was a direct relation between the luminosity and the period of the variation in their brightness?
a. Henrietta Leavitt b. Edwin Hubble c. John Glenn d. Carl Sagan e. Annie Cannon
A stonecutter's chisel has an edge area of 0.50 cm2 . If the chisel is struck with a force of 45.0 N, what is the pressure exerted on the stone?
a. 9.0E+2 Pa b. 9.0E+3 Pa c. 9.0E+4 Pa d. 9.0E+5 Pa e. 4.5E+5 Pa