Which of the following statements is true of brown dwarfs?
A) They are almost the same size as Jupiter.
B) They emit most of their energy as gamma rays.
C) They generate energy by hydrogen fusion.
D) They are high-luminosity objects.
A
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Energy Conservation With Conservative Forces: A rock falls from a vertical cliff that is 4.0 m tall and experiences no significant air resistance as it falls. At what speed will its gravitational potential energy (relative to the base of the cliff) be equal to its kinetic energy?
A. 3.1 m/s B. 4.4 m/s C. 6.3 m/s D. 8.9 m/s E. 13 m/s
Which of these was NOT a telescopic discovery of Galileo?
A) the moons of Saturn B) the craters and mare of the Moon C) sunspots and the rotation of the Sun D) the four largest moons of Jupiter E) the phases of Venus
A waffle cone has a diameter of 2.5 inches and is 5.5 inches tall. What is the volume of the waffle cone in cubic centimeters?
A) 58 cubic cm B) 150 cubic cm C) 240 cubic cm D) 440 cubic cm E) 620 cubic cm
In the formula E = mc2, what does E represent?
A) the kinetic energy of a moving object B) the radiative energy carried by light C) the gravitational potential energy of an object held above the ground D) the mass-energy, or potential energy stored in an object's mass E) the electric charge of the object