A set of charged spheres carries -1.5 mC and each has mass 15 ?g. What vertical electric field in the laboratory would cause these spheres to continue in a straight line if they were projected horizontally into the electric-field region?
A. -98 ?V/m
B. 10 mV/m
C. -10 mV/m
D. 98 ?V/m
A. -98 ?V/m
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Two objects of equal mass hit a wall with the same velocity. They both rebound with the same velocity. Both objects experience the same momentum change but one experiences twice the force as the other. Which of the following statements is true?
A. the contact time between the object and the wall of one is twice the contact time of the other B. the contact time between the object and the wall of one is equal to the contact time of the other C. the contact time between the object and the wall of one is one-half the contact time of the other D. the change in the kinetic energy is the same for the two objects E. the contact time between the object and the wall of one is 1/3 the contact time of the other
Process of Science: Given that Einstein's equations naturally showed the possibility of an accelerating Universe, why have astronomers only recently found strong evidence for dark energy?
What will be an ideal response?
You can hear sound through an open window from sources that are not in your line of sight because of
a. interference b. diffraction c. the sound level d. the Doppler effect e. none of the above
When measuring air temperature, it is best to avoid
a. shade. b. shadows. c. direct sunlight. d. none of these.