A car heading north collides at an intersection with a truck of the same mass as the car heading east. If they lock together and travel at 28 m/s at 46° north of east just after the collision,
how fast was the car initially traveling? Assume that any other unbalanced forces are negligible.
A) 40 m/s B) 80 m/s C) 30 m/s D) 20 m/s
A
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If the same quantity of heat is added to both a 2-liter and a 4-liter container of water, the temperature change in the 4-liter container will be
A) less. B) the same. C) greater.
Millisecond pulsars _____
a. are created in supernova explosions of the most massive stars b. result from the collision of two neutron stars c. represent the youngest pulsars detected d. result from long-term mass transfer from a companion star e. are a theoretical prediction that has not been observed
Weight and g: Planet Z-34 has a mass equal to one-third that of Earth and a radius equal to one-third that of Earth. With g representing, as usual, the acceleration due to gravity at the surface of Earth, the acceleration due to gravity at the surface of Z-34 is
A. g/3. B. 3g. C. 6g. D. g/9. E. 9g.
Order these objects by size (radius) from smallest to largest:
A) 3 solar mass black hole, 3 solar mass neutron star, 0.5 solar mass white dwarf, 1 solar mass white dwarf. B) 0.5 solar mass white dwarf, 1 solar mass white dwarf, a 3 solar mass neutron star, a 3 solar mass black hole. C) 3 solar mass neutron star, 3 solar mass black hole, 1 solar mass white dwarf, 0.5 solar mass white dwarf. D) 3 solar mass black hole, 3 solar mass neutron star, 1 solar mass white dwarf, 0.5 solar mass white dwarf. E) 0.5 solar mass white dwarf, 1 solar mass white dwarf, a 3 solar mass black hole, a 3 solar mass neutron star. F) 1 solar-mass white dwarf, 0.5 solar-mass white dwarf, a 3 solar-mass neutron star, a 3 solar-mass black hole.