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A simple equation to relate the scale size of the universe today to the scale size of the universe at a previous time in the history of the universe is 1 + z = atoday/athen where athen is the scale size at the time in the past, atoday = 1 is the assumed scale size today, and z is the redshift. Using the redshift value of 1100 for a time just after the big bang when the universe was a hot gas, how many times has the universe since expanded?
A 0.800-kg block oscillates on the end of a spring whose spring constant is k = 42.0 N/m. What is the fractional decrease in amplitude per cycle
A hydrogen atom has its electron in the n = 2 Level. The radius of the electron's orbit in the Bohr model is 0.212 nm.
A 220-cm-square sign is impacted straight on by a 50 m=s 10-C wind. Estimate the force on the sign. If the sign is held by a single 3-m-high post imbedded in concrete, what moment would exist at the base of the post?
Calculate the net impulse delivered to a 138-kg quarterback initally running at 4.5 m/s if he's hit by a defending player and slowed to a speed of 1.1 m/s
As part of measuring the charge-to-mass ratio of alpha rays from radium, Rutherford measured their velocity and got about 2.5×107 m s-1.
A uniform electric field of magnitude 405N/C pointing in the positive x-direction acts on anelectron, which is initially at rest. The electron has moved2.90 cm. What is the work done by the field on the electron?
A boy whirls a stonein a horizontal circle 1.6 m above the ground, by means of a string1.4 m long. The angle between the string and horizontal plane is 10degrees. The string breaks,the stone flies of horizontally, and strikes the ground 6 m away.What..
In the motion picture Danny Deckchair, based on an real event, a man attaches 42 helium-filled weather balloons to an aluminum deck chair, steps in, and takes off to experience a series of adventures. Find the net upward force on Danny
A 0.350 kilogram particle slides around a horizontal track. The track has a smooth vertical outer wall forming a circle with a radius of 1.50 meter. Find the total number of revolutions the particle makes
(a) Construct the wave function for hydrogen in the state n=4, l=3, m=2. Express your answer as a function of the spherical coordinates (r,theta,phi). (b) Find the expectation value of r in this state.
A long solenoid of length 8 m with a cross-sectional area of 5.0 x 10-5 m2 contains a total of 52,000turns. Compute the self-inductance of the solenoid, assuming that the core of the solenoid is air.
A 4.0 µF capacitor is connected in series with a 2.0 kohm resistor across a 20-V DC source and an open switch. what is the charge on the capacitor
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