The interior of a large mass of food in a microwave oven must be heated mainly by
a. radiation.
b. conduction.
c. convection.
d. radioactivity.
b
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In the grapefruit model of the solar system, it would take a few minutes to walk from the Sun to Pluto
Indicate whether the statement is true or false
A 160 lb person has a mass of 160/32 = 5 slugs. A 160-lb person steps into an elevator and stands on a bathroom scale. Determine the scale reading for the given scenarios. The elevator accelerates upwards and is now moving at a constant speed
a. 150 lb b. 160 lb c. 170 lb d. none of the above
The magnetic field of the Earth at a particular location is directed vertically downward with magnitude of 40.0 ?T. An electron is moving horizontally toward the west in this field with a speed of 5.2 × 10^6 m/s. What are the direction and magnitude of the magnetic force the field exerts on the electron? (e = 1.6 × 10^–19 C)
a. 3.33E–17,south b. 3.33E–17,north c. 2.08E–20,south d. 2.08E–20,north
A proton is accelerated from rest through a potential difference of 150 V. It then enters a region of uniform magnetic field and moves in a circular path (radius = 12 cm). What is the magnitude of the magnetic field in this region?
a. 18 mT b. 12 mT c. 15 mT d. 22 mT e. 10 mT