A high-mass star dies more violently than a low-mass star because
A) it must always end up as a black hole.
B) it generates more heat and its core eventually collapses very suddenly.
C) it cannot fuse elements heavier than carbon.
D) gravity is weakened by its high luminosity.
E) it is most often found as part of a binary system.
B
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Two long parallel wires separated by 5.0 mm each carry a current of 60 A. These two currents are oppositely directed. What is the magnitude of the magnetic field at a point that is between the two wires and 2.0 mm from one of the two wires?
A. 2.0 mT B. 10 mT C. 8.0 mT D. 1.6 mT E. 7.2 mT
An object of mass 8.0 kg is attached to an ideal massless spring and allowed to hang in the Earth's gravitational field. The spring stretches 3.6 cm before it reaches its equilibrium position
If this system is allowed to oscillate, what will be its frequency? A) 0.0045 Hz B) 0.67 Hz C) 2.6 Hz D) 2.1 Hz
A neutral atom has an electron configuration of 1s22s22p6. If a neutral atom holds one additional electron, what is the ground state configuration?
A) 1s22s22p63s1 B) 1s22s22p7 C) 1s22s32p6 D) 1s32s32p6 E) none of the given answers
If an atom were the size of a baseball, its nucleus would be about the size of a(n)
A) walnut. B) raisin. C) flea. D) atom.