A champion athlete can produce one horsepower (746 W) for a short period of time. If a 70-kg athlete were to bicycle to the summit of a 500-m high mountain while expending power at this rate, she would reach the summit in ____ seconds
a.
1
b.
460
c.
500
d.
1000
e.
35,000
b
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A piece of glass has a thin film of gasoline floating on it. A beam of light is shining perpendicular on the film
If the wavelength of light incident on the film is 560 nm and the indices of refraction of gasoline and glass are 1.40 and 1.50, respectively, what is the minimum nonzero thickness of the film to see a bright reflection? A) 500 nm B) 400 nm C) 300 nm D) 200 nm E) 100 nm
The Mohs scale is based on how many minerals?
a. 8 b. 10 c. 12 d. 15
List the four fundamental forces in nature
A) gravitational, normal, tension, friction B) gravitational, normal, kinetic friction, static friction C) gravitational, electromagnetic, strong nuclear, weak nuclear D) gravitational, electromagnetic, contact, nuclear E) gravitational, contact, strong nuclear, weak nuclear
A +15-nC point charge is placed on the x axis at x = 1.5 m, and a -20-nC charge is placed on the y axis at y = -2.0m. What is the magnitude of the electric field at the origin?
a. 105 N/C b. 15 N/C c. 75 N/C d. 45 N/C e. 60 N/C