A common electromagnet consists of a
A) bar magnet that carries an electric current.
B) current-carrying wire coil.
C) current-carrying coil with a piece of iron inside.
Answer: C
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The planets in the solar system
A) revolve around the Sun in the same direction B) orbit around the Sun in nearly the same plane C) have nearly circular orbits D) all of these are true
What power contact lens should be used to correct the vision of a farsighted person whose near point is 80 cm to see something clearly at a distance of 25 cm?
A) 2.8 diopters B) -2.8 diopters C) -4.0 diopters D) -4.2 diopters E) 4.2 diopters
A 6.0 kg mass in the xy plane is moving in the negative x direction at 3.0 m/s along the line y = 4.0 m. As the mass passes the point (x, y = 10 m, 4.0 m), what is its angular momentum with respect to the z axis?
a. 30 SI units c. -60 SI units b. 72 SI units d. -180 SI units
The seasons are caused by the precession of the Earth's axis
Indicate whether the statement is true or false