The half-life of 20F is 11 s. What fraction of a sample of 20F will remain after 44 s have elapsed?
a. 1/4
b. 1/16
c. 1/8
d. None of these
b
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The figure below shows a single lens with two rays of white light incident on it from the left. Sketch the paths of the blue, yellow, and red components of each of these rays to the point where the light from the upper and lower rays would meet
What will be an ideal response?
Driving eastward just before sunrise, if you observe the Moon in the eastern sky, its phase must be:
A) full moon. B) first quarter. C) waxing Gibbous. D) waning Crescent. E) new moon.
An object that is initially at rest breaks up into two pieces of unequal masses when a spring-loaded device is released
If you compare the kinetic energy of the larger mass to that of the smaller mass immediately after they separate, which of the following statements is correct? A) The kinetic energy of the larger mass is greater. B) The kinetic energy of the smaller mass is greater. C) The kinetic energies of the two masses are equal. D) The total kinetic energy is zero J.
An object moves 20 m east in 30 s and then returns to its starting point taking an additional 50 s. If west is chosen as the positive direction, what is the sign associated with the average velocity of the object?
a. + c. 0 (no sign) b. - d. any of the above