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A) A cosmologist measures the value of the Hubble constant to be H=27.9 km/s/e6 light years. The reciprocal of H (1/H) provides an estimate of the age of the universe. What value would this cosmologist estimate for the age of the universe? Express your answer in seconds.
B) Express your estimate for the age of the universe in years.
C) Calculate the recession velocity this value of the Hubble constant implies for a star 17*10^(6) lightyears away.
The moment of inertia of a 0.949 kilogram bicycle wheel rotating about its center is 0.131 kg x m2. Find the radius of this wheel, suppose the weight of the spokes can be neglected
what are the possible values of and m1 and m3 - List the quantum numbers for each electron in the ground state of nitrogen
A man of mass 86.5 kg and density 970 kg/m3 stands in a shallow pool with 39.1 % of the volume of his body below water
A spinning flywheel has rotational inertia I = 401.0 kg · m2. Its angular velocity decreases from 20.4 rad/s to zero in 261.6 s due to friction
A merry-go-round is spinning and has a period of 7.25 s. A boy jumps off in a direction parallel to the radius and, by so doing, changes the moment of inertia of the merry-go-round from 575 kg·m2to 545 kg·m2. By conservation of angular momentum, appr..
A diffraction grating with 13700 lines per 2.54 cm (i.e., per in.) is utilized to view the visible spectrum from a Hydrogen gas excited with an electrical discharge. At what angle from the beam axis will the first order peak for the red photons by wa..
A student attempts to "levitate" a piece of current-carrying wire using the Earth's magnetic field (55 T). How much current must run through the wire so that the magnetic force balances the weight of the wire
An object is attached to the lower end of a 100-coil spring that is hanging from the ceiling. By how much does each spring stretch
A pendulum has a length L = 1.11m. It hangs straight down in a jet plane about to take off as shown by the dotted line, Calculate the magnitude of the plane's acceleration
Find the positions of the two masses at any subsequent time t (before either mass returns to the table) and describe the motion.
A hiker, who weighs 919 N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs 4410 N, and rests on two concrete supports, one on each end. He stops 1/3 of the way along the bridge.
How numerous atoms does each hand contain
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