Helioseismology is the study of the differential rotation and magnetic field of the Sun
a. True
b. False
Indicate whether the statement is true or false
False
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Total lunar eclipses always occur
a. at the time of new Moon. b. at the time of full Moon. c. during either equinox. d. during either solstice. e. at the time that the Sun is directly overhead.
A body sliding on a table is observed to gradually slow down. The correct statement is that the body slows down because
A. no net force acts on the body. B. no force acts on the body. C. it is the nature of the body to slow down by itself. D. a net force acts on the body.
A roller-coaster car has a mass of 500 kg when fully loaded with passengers. The car passes over a hill of radius 15 m, as shown. At the top of the hill, the car has a speed of 8.0 m/s. What is the force of the track on the car at the top of the hill?
A. 7.0 kN up B. 7.0 kN down C. 2.8 kN down D. 2.8 kN up E. 5.6 kN down
Calculate the frequency, in hertz, of photons of light with energy of 2.00 × 10^-19 J