In 20 minutes, Kara ran 2.40 km on a treadmill facing due east. Relative to the gym, what were her displacement and average velocity during this time interval?
a. 0; 0
b. 0; 2.00 m/s
c. 2.40 km, east; 0
d. 2.40 km, east; 2.00 m/s, east
e. 2.40 km, west; 2.00 m/s, west
A
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Which of the following is not a standard metric unit?
a. Kilogram b. Meter c. Second d. Gram
The power expended doing 100 J of work in 50 s is
A) 1/2 W. B) 2 W. C) 4 W. D) 50 W. E) 5,000 W.
A reversible engine operating between 500 K and 300 K has the same efficiency as a reversible engine operating between 400 K and what lower temperature?
A) 200 K B) 220 K C) 240 K D) 260 K E) 280 K
You are the science officer on a visit to a distant solar system. Prior to landing on a planet you measure its diameter to be 1.8 × 107 m and its rotation period to be 22.3 hours
You have previously determined that the planet orbits 1.8 × 1011 m from its star with a period of 402 earth days. Once on the surface you find that the acceleration due to gravity is 59.7 m/s2. What are the mass of (a) the planet and (b) the star? (G = 6.67 × 10-11 N ? m2/kg2.) A) (a) 7.2 kg × kg, (b) 2.9 kg × kg B) (a) 1.3 kg × kg, (b) 2.9 kg × kg C) (a) 7.2 kg × kg, (b) 1.7 kg × kg D) (a) 1.3 kg × kg, (b) 1.7 kg × kg