The stars with masses comparable to our Sun's, but sizes like the Earth are
A) red giants.
B) red main sequence stars.
C) neutron stars.
D) white dwarfs.
E) blue main sequence stars.
D
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A diffraction grating is to be used to find the wavelength of the light in the emission spectrum of a gas
The grating spacing is not known, but a light having a known wavelength of 632.8 nm is deflected by 43.2° away from the central maximum in the second order by this grating. Light of the wavelength to be measured is deflected by 48.2° away from the central maximum in the second order. What is the wavelength of this light?
An 80 kg person walks up a flight of 3 m high stairs, then down the same flight of stairs to the person's original position. What is the change in the person's gravitational potential energy?
a. 0 J b. 240 J c. 480 J d. 2352 J e. 4704 J
The force that keeps your feet from sliding as you walk is
a. centripetal force b. weight c. kinetic friction d. static friction e. none of the above
Escape speed from Earth is about
1) 8 km/s. 2) 11.2 km/s. 3) more than 11.2 km/s. Interestingly, if a stone released at rest at the far edge of the solar system drops to Earth by virtue of only Earth gravity, it will strike Earth's surface with a speed of about 4) 8 m/s. 5) 10 km/s. 6) 11.2 km/s. 7) more than 11.2 km/s.