What would happen if a white dwarf gained enough mass to reach the 1.4 solar-mass white dwarf limit?
A) The white dwarf would explode completely as a white dwarf supernova.
B) The white dwarf would collapse in size, becoming a neutron star.
C) The white dwarf would undergo a nova explosion.
D) The white dwarf would collapse to become a black hole.
A) The white dwarf would explode completely as a white dwarf supernova.
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Two forces act on a 55-kg object. One force has magnitude 65 N directed 59° clockwise from the positive x-axis, and the other has a magnitude 35 N at 32° clockwise from the positive y-axis. What is the magnitude of this object's acceleration?
A) 1.1 m/s2 B) 1.3 m/s2 C) 1.5 m/s2 D) 1.7 m/s2
An athlete doing push-ups performs 650 kJ of work and loses 425 kJ of heat. What is the change in the internal energy of the athlete?
A) -225 kJ B) -1075 kJ C) 1075 kJ D) 225 kJ E) 276 kJ
If a = 1.0 cm, b = 3.0 cm, and I = 30 A, what is the magnitude of the magnetic field at point P?
a.
0.62 mT
b.
0.59 mT
c.
0.35 mT
d.
0.31 mT
e.
0.10 mT
Electric potential, measured in volts, is the ratio of electric energy to the amount of electric
A) current. B) resistance. C) charge. D) voltage. E) none of the above