A 22.3-g bullet moving at 1 000 m/s is fired through a one-kg block of wood emerging at a speed of 100 m/s. What is the change in the kinetic energy of the bullet-block system as a result of the collision assuming the block is free to move?
a. 0 J
b. 10.8 kJ
c. –10.8 kJ
d. 11.2 J
e. 223 J
c
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Polarization: Unpolarized light of intensity I0 passed through an ideal polarizing sheet with its polarizing axis at the 12 o'clock position and then through a second ideal sheet with its polarizing axis at the 1 o'clock position. What is the intensity of the emerging light in terms of I0?
Fill in the blank(s) with the appropriate word(s).
A rock is thrown straight up with an initial velocity of 15.0 m/s. Ignore energy lost to air friction. How high will the rock rise?
a. 7.5 m b. 113 m c. 23.0 m d. 11.5 m e. 0.0871 m
If the Q value of an endothermic reaction is –2.17 MeV, then the minimum kinetic energy needed in the reactant nuclei if the reaction is to occur must be
1.equal to 2.17 MeV. 2.greater than 2.17 MeV. 3.less than 2.17 MeV. 4.exactly half of 2.17 MeV.
The__________is the period of time after the glow of the big bang faded into the infrared and before the birth of the first stars, during which the Universe expanded in darkness
A) space age B) dark age C) atomic age D) ice age