A hockey puck moving at 7.00 m/s coasts to a halt in 80.0 m on a smooth ice surface. What is the coefficient of friction between the ice and the puck?
a. ? = 0.109
b. ? = 0.031
c. ? = 0.063
d. ? = 0.094
e. ? = 0.156
b
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Your worldline is shown in red on this spacetime diagram. The diagonal orange line could represent the worldline of
A) a flashlight beam that you turned on 2 seconds ago. B) you, when you start running to your left. C) a person running backward away from you. D) a light beam that is shining on you.
On a very cold day, a child puts his tongue against a fence post. It is much more likely that his tongue will stick to a steel post than to a wooden post. This is because:
A. steel has a higher specific heat B. steel is a better radiator of heat C. steel has a higher specific gravity D. steel is a better heat conductor E. steel is a highly magnetic material
A kilowatt-hour is equivalent to
A) 3600 J. B) 3600 J/s C) 1000 W. D) 3,600,000 J. E) 3,600,000 J/s.
A toaster is rated at 800 W when operating at 120 V dc. What is the resistance of its heating element?
A) 16 ? B) 18 ? C) 6.7 ? D) 0.15 ?