What is the reason a type-I supernova slows its dimming after about 2 months?
A) The planetary nebula cooled enough to form a dust shell.
B) Energy is released from the decay of radioactive cobalt 56 to iron 56.
C) The supernova remnant suddenly becomes transparent.
D) The burst of energy carried by neutrinos is finally observed.
E) Energy from the supernova's shock wave is released as it hits interstellar matter.
B
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Weight and g: The radius of the earth is R. At what distance above the earth's surface will the acceleration of gravity be 4.9 m/s2?
A. 0.41 R B. 0.50 R C. 1.00 R D. 1.41 R E. 0.25 R
The lowest point in the potential energy curve on an energy diagram is
A. The turning point B. Point of smallest total energy C. Point of largest total energy D. Point of largest velocity
The ______________ occurs on June 21
a. autumnal equinox b. winter solstice c. summer solstice d. vernal equinox
The element symbol C stands for cobalt
Indicate whether the statement is true or false