An athlete competing in the long jump leaves the ground with a speed of 9.14 m/s at an angle of 35° above the horizontal. How long does the athlete stay in the air, assuming no significant air resistance?
A) 0.88 s B) 1.1 s C) 0.54 s D) 0.50 s E) 2.5 s
B
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Photon Energy: A small gas laser of the type used in classrooms may radiate light at a power level of 2.0 mW. If the wavelength of the laser light is 642 nm, how many photons does it emit per second? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
Tomatoes have a higher specific heat capacity than dough. This means that when you bite into a hot pizza
A) the dough feels hotter than the tomato sauce. B) the tomato sauce feels hotter than the dough. C) since sauce and dough are at the same temperature, neither feels hotter.
The large space telescope that has been placed into an Earth orbit has an aperture diameter of 2.40 meters. What angular resolution will this telescope achieve for visible light of wavelength l = 4.80 × 10^-7 m?
a. 2.44 × 10^-7 rads b. 2.44 × 10^-4 rads c. 2.44 × 10^-3 rads d. 1.22 × 10^-6 rads e. 2.00 × 10^-6 rads
What does a breeder reactor do?
a. Produces plutonium from uranium and thereby creates more nuclear fuel than it uses. b. Creates independent chain reactions that then separate from their parents and become new energy sources. c. Uses controlled rates of reaction to conserve nuclear fuel. d. Creates its own neutron bombardment beam out of the neutrons that escape from the uranium as it decays. e. Creates its own control rods out of the lead resulting from uranium decay.