A concave mirror has a focal length of 20 cm. What is the magnification if the object's distance is 100 cm?
a. 1/2
b. 1/4
c. -2
d. 4
e. -1/4
E
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Equilibrium: In the figure, what does the spring scale read? The pulleys are ideal and the strings and scale are also massless.
A. exactly 2.0 N. B. exactly 1.0 N C. 0.50 N D. 0.00 N E. more than 19.6 N
A solid sphere, a solid cylinder, a spherical shell, and a hoop all have the same mass and radius. Each are rolling on a horizontal surface with the same center of mass speed, and then they roll up identical inclines. Which one goes the greatest distance up its incline?
a. the hoop b. the solid sphere c. the spherical shell d. the cylinder e. They all go the same distance up their inclines.
Which portion of the electromagnetic spectrum is used to identify fluorescent minerals?
a. ultraviolet light b. X rays c. infrared waves d. gamma rays
What role does an atmosphere play in surface habitability?
A) it exerts a pressure which allows liquid water to be stable B) it protects the surface against harmful solar radiation C) it helps generate a protective magnetic field D) Both A and B