A star is observed with a surface temperature of 3,000 K and a luminosity of 10?2 solar. What is the approximate mass of this star?
A) 0.5 Msun B) 0.9 Msun
C) 0.2 Msun D) The mass cannot be determined.
C
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State the law of the conservation of mechanical energy
What will be an ideal response?
A cyclist does work at the rate of 500 W while riding. How much force does her foot push with when she is traveling at 8.0 m/s?
A) 31 N B) 63 N C) 80 N D) 160 N E) 4000 N
Every particle has a corresponding antiparticle
Indicate whether the statement is true or false
Electrons are used to produce X-rays by allowing a beam of electrons to strike a heavy metal surface. When the intensity of the electron beam is increased, this results in:
A. X-rays being produced having longer wavelength B. X-rays being produced having higher energy C. More X-rays produced per unit time D. Faster X-rays being produced