A firecracker explodes in midair and breaks up into many fragments. Which of the following statements are true regarding conditions immediately before and immediately after the explosion:
I. The total momentum of the fragments is equal to the original momentum of the firecracker.
II. The total kinetic energy of the fragments is equal to the original kinetic energy of the firecracker.
A) Statement I only
B) Statement II only
C) Both Statement I and Statement II
D) Neither statement is true.
A
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Intensity: Which one of the following expressions is the correct representation for the speed of light in vacuum?
A. 
B. 
C. 
D. 1 / 
E. 1 / ?0?0
An apple weighing 3 newtons hangs, motionless, from a tree branch. Newton's law of force pairs says that forces always come in pairs. One force acting on the apple is the apple's weight
What is the other force that forms a force pair with the weight? A) The apple pulling upward on Earth. B) The apple pulling downward on the branch. C) Earth pulling downward on the apple. D) The branch pulling upward on the apple.
During each cycle of operation a refrigerator absorbs 45 cal from the freezer compartment and expels 85 cal to the room. If one cycle occurs every 8.0 s, how many minutes will it take to freeze 500 g of water, initially at 0°C? (Lv = 80 cal/g)
a. 800 min c. 120 min b. 4400 min d. 150 min
A magnetic dipole has two stable orientations in a magnetic field. At what two angles relative to the magnetic field direction are these orientations?
a) 0° and 90° b) 0° and 180° c) 90° and 270° d) 45° and 135° e) 45° and 90°