A 2-L bottle of soda gives you more for your money than a 2-qt bottle would, at the same price
Indicate whether the statement is true or false
TRUE
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Specific Heat: In grinding a steel knife, the metal can get as hot as 400°C. If the blade has a mass of 80 g, what is the minimum amount of water needed at 20°C if the water is to remain liquid and not rise above 100°C when the hot blade is quenched in it? The specific heat of the steel is 0.11 cal/g ? C° and the specific heat of water is 1.0 cal/g ? C°.
A. 22 g B. 33 g C. 44 g D. 55 g
Camera Optics: The focal length of the lens of a simple digital camera is 40 mm, and it is originally focused on a person 25 m away. In what direction must the lens be moved to change the focus of the camera to a person 4.0 m away?
A. It does not make any difference. B. sideways from the CCD sensors C. away from the CCD sensors D. towards the CCD sensors
An electronic component with a 17-? resistor is rated for use at power levels not exceeding What is the safe current through the component?
A) 0.91 A B) 1.21 A C) 238 A D) 0.22 A
The gravitational pull of Earth acting on an object is zero when the object
a. has zero acceleration. b. is in free fall. c. is midway between Earth and the Moon. d. is in orbit around Earth. e. none of these