Why do the millisecond pulsars violate the usual rotation pattern for pulsars?
What will be an ideal response?
Most pulsars will slow down over time, but the extra mass added by close companions causes the millisecond pulsars to spin faster instead.
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If the ground state energy level of an electron in a rigid box is 5.0 eV, what is the width of the box?
A) 2.3 × 10-11 m B) 7.3 × 10-20 m C) 2.7 × 10-10 m D) 1.0 × 10-10 m E) 9.1 × 10-21 m
For the principle quantum number n = 4, how many values can the orbital quantum number have?
A. 9 B. 5 C. 4 D. 3 E. 32
An elephant can hear sound with a frequency of 15 Hz. What is the wavelength of this wave if the speed of sound in air is 343 m/s?
What will be an ideal response?
A heat engine operating between 40°C and 380°C has an efficiency 60% of that of a Carnot engine operating between the same temperatures. If the engine absorbs heat at a rate of 60 kW, at what rate does it exhaust heat?
What will be an ideal response?