How do microwave ovens can heat food more quickly than conventional ovens?
a. Microwaves give energy directly to the molecules in the food.
b. Conventional ovens must conduct heat from the surface to the interior of the food.
c. Microwaves heat the inside as well as the surface of the food.
d. all of the above
C
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If two protons are heading toward one another at 0.800 c in the laboratory frame, what is the kinetic energy of one proton in the frame of reference of the other proton?
A. 3.13 GeV B. 5.56 GeV C. 1.56 GeV D. 2.50 GeV E. 3.34 GeV
Coulomb's Law: Two tiny particles having charges of +7.00 ?C and -9.00 ?C are placed along the y-axis. The +7.00-µC particle is at y = 0.00 cm, and the other particle is at y = 40.00 cm. Where must a third charged particle be placed along the y-axis so that it does not experience any net electric force due to the other two particles?
A. 0.200 m B. 2.99 m C. -0.187 m D. -2.99 m E. 0.187 m
Which statement accurately describes how our Sun fits into the mass range of stars?
A) The Sun is completely average, with half of all stars being more massive than the Sun and half of all stars being less massive than the Sun. B) The Sun is near the bottom of the overall mass range. C) The Sun is near the top of the overall mass range. D) The Sun is near the middle of the overall mass range, but most stars are more massive than the Sun. E) The Sun is near the middle of the overall mass range, but most stars are less massive than the Sun.
Mary and Debra stand on a snow-covered roof. They both throw snowballs with the same initial speed, but in different directions. Mary throws her snowball downward, at 30° below the horizontal; Debra throws her snowball upward, at 30°
When the snowballs reach the ground below, A) Debra's snowball will have a higher speed than Mary's. B) Mary's snowball will have a higher speed than Debra's. C) Both snowballs will hit the ground with the same speed. D) Debra's snowball never hits the ground since it is thrown upwards. E) Mary's snowball never hits the ground since it is thrown downwards.