How can an old pulsar have a very short pulsar period, say less than 0.03 seconds?
What will be an ideal response?
It now appears that the speedy pulsar is an old neutron star that has gained mass and rotational energy from a companion in a binary system. Like water hitting a mill wheel, the matter falling on the neutron star has spun it up to that fantastic rate.
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What are the appropriate units for the Sun's luminosity?
A) watts B) joules C) newtons D) kilograms
You want to confine an electron in a box (an infinite well) so that its ground state energy is 5.0 × 10-18 J
What should be the length of the box? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg) A) 0.11 nm B) 0.22 nm C) 0.15 nm D) 0.18 nm
A 4.0-kg block slides down a 35° incline at a constant speed when a 16-N force is applied acting up and parallel to the incline. What is the coefficient of kinetic friction between the block and the surface of the incline?
a. 0.20 b. 0.23 c. 0.26 d. 0.33 e. 0.41
The Bohr model of the hydrogen atom accounts for which quantum number?
a. principal b. orbital c. orbital magnetic d. All of the above.