A baseball (1 kg) has an energy of 100 joules. If its uncertainty in position is 1 m, what is the percentage uncertainty (?p/p × 10^0) in the momentum of the baseball?
a. <<1%
b. 1%
c. 2%
d. 5%
e. 10%
a
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What observations characterize solar maximum?
A) The Sun becomes much brighter. B) The Sun emits light of longer average wavelength. C) The Sun rotates faster at the equator. D) We see many sunspots on the surface of the Sun.
A bright red nebula is called an HII region when it contains
A. molecular hydrogen gas, H2. B. hydrogen atoms which have been ionized by ultraviolet radiation. C. hydrogen which is generating 21-cm radio waves. D. hot hydrogen gas thermally glowing.
During stage 3 of star formation, the dense, opaque region at the center of the cloud is called a:
A) Herbig-Haro object. B) T Tauri star. C) protostar. D) protoplanetary nebula. E) zero-age main sequence star.
If a rectangular area is rotated in a uniform electric field from the position where the maximum electric flux goes through it to an orientation where only half the flux goes through it, what has been the angle of rotation?
A) 45° B) 26.6° C) 90° D) 30° E) 60°