In a Hertzsprung-Russell (H-R) diagram, a star is represented by a _____ on the graph that tells you its luminosity and temperature
A) cross
B) broken line
C) point
D) dotted line
C
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Suppose an object is moving in a straight line at 50 mi/hr. According to Newton's first law of motion, the object will
A) continue to move in the same way forever, no matter what happens. B) continue to move in the same way until it is acted upon by a force. C) continue to move in a straight line forever if it is in space, but fall to the ground if it is on Earth. D) eventually slow down and come to a stop.
A reversible engine takes in energy at a rate of 555 W and exhausts energy at 482 W
(a) How much power does it produce? (b) What is its efficiency? (c) If operated in reverse as a refrigerator, what would be its performance coefficient (COP)?
A pipe of length 10.0 m increases in length by 1.5 cm when its temperature is increased by 72°F. What is its coefficient of linear expansion?
a. 38 × 10^?6/°C b. 75 × 10^?6/°C c. 68 × 10^?6/°C d. 28 × 10^?6/°C e. 47 × 10^?6/°C
A spaceship from another galaxy passes over the solar system directly above a radial line from the sun to the Earth. (We measure that distance to be 1.5 × 10^11 m.) On Earth, the spaceship is observed to be traveling at a speed of 0.80 c, for which g = 5/3 . As measured on Earth it takes the spaceship 625 seconds to travel from the sun to Earth. When a scientist in the spaceship measures the
Earth-sun distance and the time it takes her to travel that distance, she finds the results are respectively a. 9.0 × 10^10 m; 375 s. b. 9.0 × 10^10 m; 625 s. c. 1.5 × 10^11 m; 625 s. d. 2.5 × 10^11 m; 625 s. e. 2.5 × 10^11 m; 1042 s.