An object 15 cm high is placed 15 cm in front of a convex mirror with a focal length of -10 cm. What is the image height (in cm)?
a. 2
b. 4
c. 6
d. 8
e. 30
C
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The Sun's average surface (photosphere) temperature is about
A) 5,800 K. B) 1,000,000 K. C) 1,000 K. D) 37,000 K.
Which of the following observations is consistent with the hypothesis that all life on Earth has a common ancestor?
A) different organisms use the same set of amino acids B) different organisms use different sets of amino acids C) all proteins are made of amino acids D) some organisms don't use amino acids at all
A Ferris wheel has diameter of 10 m and makes one revolution in 8.0 seconds. A person weighing 670 N is sitting on one of the benches attached at the rim of the wheel
What is the apparent weight (that is, the normal force exerted on her by the bench) of the person as she passes through the highest point of her motion?
Five boys are pushing on a snowball, and each is pushing with a force of 10.0.0 N. However, each boy is pushing in a different direction. They are pushing north, northeast, east, southeast, and south. (Each boy is pushing at an angle of 45.0° relative to his neighbor.) What is the magnitude of the total force on the ball?
a. 0 b. 14.1 N c. 24.1 N d. 11.4 N e. 48.3 N