In the context of binary pulsars, in Hercules X-1, _____
A) matter flows from a star into an accretion disk around a dead star, producing gamma rays
B) a 6-solar-mass star and a neutron star orbit each other with a period of 28.7 days
C) several low-energy processes go on simultaneously
D) X-rays turn off when the neutron star is eclipsed behind the normal star
D
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The rapid decline in quasars 10 billion years ago signifies a rapid decline in galactic mergers
Indicate whether the statement is true or false
Monochromatic light of wavelength 500 nm is incident normally on a diffraction grating. If the third-order maximum of the diffraction pattern is observed at 32.0°, what is the total number of maxima can be seen?
A) 5 B) 7 C) 10 D) 11 E) 8
A 0.38-kg block rests on a level surface and is attached to a horizontally aligned spring with a spring constant of 55.0 N/m. The block is initially displaced 4.8 cm from the equilibrium point and then released to set up a simple harmonic motion. A frictional force of 0.50 N exists between the block and surface. What is the speed of the block when it passes through the equilibrium point after
being released from the 4.8-cm displacement point? a. 0.21 m/s b. 0.32 m/s c. 0.64 m/s d. 0.46 m/s e. 1.8 m/s
Compared to the atoms that make up the body of an elderly person, the atoms that make up the body of a newborn baby are
A) newer. B) actually older. C) the same age.