A fancy sports car moves past an observer on a corner at a speed of 0.600c. When the observer indicates a one-second interval has passed, what time interval will be shown on the driver's watch?
a. 1.67 s
b. 0.800 s
c. 1.25 s
d. 0.600 s
e. 1.00 s
c
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Friction: During a hockey game, a puck is given an initial speed of 10 m/s. It slides 50 m on the horizontal ice before it stops due to friction. What is the coefficient of kinetic friction between the puck and the ice?
A. 0.090 B. 0.10 C. 0.11 D. 0.12
A bucket of water with total mass 23 kg is attached to a rope, which in turn is wound around a 0.050-m radius cylinder at the top of a well. The bucket is raised to the top of the well and released. The bucket is moving with a speed of 6.0 m/s upon hitting the water surface in the well. What is the angular speed of the cylinder at this instant?
a. 39 rad/s c. 120 rad/s b. 79 rad/s d. 160 rad/s
The atomic bomb that was dropped on Nagasaki in 1945 killed 140,000 people, helping to end World War II on the next day. It released energy equivalent to that of 20,000 tons of TNT explosive
How much mass was converted to energy when this took place? (1000 tons ? 4.3 × 1012 J) (Incidentally, modern H-bombs have energy yields 1000 times as much!)
The radio source ________ is located in a place consistent with the center of our Galaxy
A) Cygnus X-1 B) 3C 273 C) 47 Tucanae D) M-8, the Lagoon Nebula E) Sgr A?