In our solar system
A: the planets in outer orbits move at a slower speed than those in inner orbits.
B: the planets all move around the Sun at the same speed.
C: the planets in outer orbits move at a faster speed than those in inner orbits.
Ans: A: the planets in outer orbits move at a slower speed than those in inner orbits.
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____ are believed to have formed on Mercury when the planet's interior cooled and shrank
a. Jumbled terrain b. The highlands c. Maria d. Lobate scarps e. Sinuous rilles
Which statement must be true for a rocket to travel from Earth to another planet?
A) It must attain escape velocity from Earth. B) It must carry a lot of extra fuel. C) It must have large engines. D) It must be launched from space, rather than from the ground.
Why is the air at higher altitudes cooler than that at lower altitudes?
A. Because of the relation expressed in Charles' Law, V/T = constant. B. Because of the relation expressed in Gay-Lussac's Law, P/T = constant. C. Because of the relation expressed in Boyle's Law, PV = constant.
A coil of 150 turns of wire is in the form of a circle of diameter 7.5 cm, and sits in the center of a dipole magnet that produces a uniform magnetic field of strength 1.5 T. The torque on the coil has a maximum value of 0.25 Nm. What is the current in the coils?
A. 9.4 A B. 200 mA C. 4.7 mA D. 63 mA E. 94 mA