What is the wavelength of a 1-hertz electromagnetic wave?
A) less than 1 m
B) 1 m
C) more than 1 m
Answer: C
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Even though Jupiter's moon Io is similar in size to our geologically dead Moon, it is more geologically active than the Earth. How can this be?
A) because Io orbits very close to Jupiter, it still has a lot of heat trapped inside from its formation B) Io is tidally heated by tidal forces exerted by the outer Galilean moons, which flex and distort its interior C) Io has much more radioactive decay occurring inside it than does the Earth D) Io is tidally heated due to its elliptical orbit, which causes the large tidal forces exerted by Jupiter to constantly change, flexing and distorting its interior
A parallel-plate capacitor has a capacitance of 10 mF and charged with a 20-V power supply. The power supply is then removed and a dielectric material of dielectric constant 4.0 is used to fill the space between the plates
How much energy is now stored by the capacitor? A) 250 mJ B) 125 mJ C) 500 mJ D) 62.5 mJ E) 1200 mJ
A ball thrown upwards reaches a maximum height and then comes back down to the original level. As the ball is going upwards
a. the velocity and acceleration both point up. b. the velocity points up and the acceleration down. c. the velocity points down and the acceleration up. d. the velocity and acceleration both point down. e. the acceleration is zero.
A 70-kg high jumper leaves the ground with a vertical velocity of 6.0 m/s. How high can he jump?