A hornet circles around a pop can at increasing speed while flying in a path with a 12-cm diameter. We can conclude that the hornet's wings must push on the air with force components that are
a. straight down.
b. down and inwards.
c. down and outwards.
d. down and backwards.
e. down, backwards and outwards.
E
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Kepler's ________ law states that the orbits of planets are elliptical, with the Sun at one focus.
A. First B. Second C. Third D. Fourth
The voltage across the dees of a cyclotron is 30,000 V. How many revolutions do the protons go through in reaching 21 MeV kinetic energy?
A) more than 2 x 106 B) 1400 C) 700 D) 350 E) 35
A(n) ______ grid layout determines the size of page elements based on a percentage of the screen.
A. adaptive B. contextual C. fluid D. responsive
A bullet is fired from a rifle. The end of the barrel is a circular aperture. Is diffraction a measurable effect?
A. yes B. no, because the de Broglie wavelength of the bullet is too large relative to the aperture C. yes, because the aperture may be a slit or circular aperture D. no, because the de Broglie wavelength of the bullet is too small relative to the aperture