Earth is hit about once a week by meter-size asteroids
a. True
b. False
Indicate whether the statement is true or false
True
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Work: A child does 350 J of work while pulling a box from the ground up to his tree house at a steady speed with a light rope. The tree house is 4.0 m above the ground. What is the mass of the box?
A. 8.9 kg B. 5.3 kg C. 6.7 kg D. 8.0 kg
Everything looks red through a red filter because
A) the filter emits red light and absorbs other colors. B) the filter absorbs red light and emits other colors. C) the filter transmits red light and absorbs other colors. D) the filter reflects red light and transmits other colors.
A mixture consists of 70 g of ice and 60 g of liquid water, both at 0°C. (The latent heat of fusion of water is 80 cal/g and the specific heat capacity of water is 1.0 cal/g C°.) The amount of heat that must be added to melt all of the ice is about
A. 4000 cal. B. 5600 cal. C. 32,400 cal. D. 21,600 cal.
Which is the middle number in this list?
a. 10 b. 100 c. 10^-1 d. 10^10 e. 10^2