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Approximately one billion years ago, the Moon orbited the Earth much closer than it does today. The radius of the orbit was only 24 400 km. Today, the radius is 385 000 km. The orbital period was only 23 400 s. The present period is 2.36 x 106 s. Assume that the orbit of the Moon is circular. Calculate the ratio of the speed of the Moon in its ancient orbit to the speed that it has today.
A uniform disk of radius 0.459 m and unknown mass is constrained to rotate about a perpendicular axis through its center. Find the mass of the disk
A 3.0kg object is subject to a restoring force. The potentialenergy of the object as a function of the distance from equilibriumis shown above. What is the objects potential energy when itsdisplacement is +4 cm from its equilibrium position
Explain qualitatively the following phenomena. At a certain momentum, the cross sections for p+_ neutron s(p+n) and p-_ proton s(p-p) interactions are equal, whereas s(K+n)=22mb and s(K-p)=55mb.
A baseball is thrown at an angle of 27 degrees relative to the ground at a speed of 20.9m/s. The ball is caught 36.0231m from the thrower. The acceleration due to gravity is 9.81m/s square. Explain how long is it in the air ?
A sinusoidal wave is propagating along a stretched string that lies along the x-axis. The displacement of the string as a function of time is graphed in the figure for particles at x = 0 and at x = 0.0900 m. What is the amplitude of the wave? What ..
How far apart are the two eggs 4 s after the second egg is thrown? What is the minimum separation between the eggs and when does it occur? Ignore the effects of air resistance.
Suppose a monochromic light strikes a grating at normal incidence. The first order diffractions lines appear at the angle 23°, what is the frequency of the light that passes through
A Thomson's gazelle can run at very high speeds, but its acceleration is relatively modest. What is the gazelle's top speed
a. the muon is traveling at 0.982 c what is its momentum? the mass of such a muon at rest in the laboratory is known
Find the initial compression of the spring so that the block presses the track with a force mg when it reaches the point P [see. Fig], where the radius of the track is horizontal.
An 8 lb weight stretches a spring 4ft, the system resides in amedium offering a resistance to the motion equal to 1.5 times theinstantaneous velocity, if the weight is released at a position 2ftabove its equilibrium position with downward velocity of..
A 0.035 kg aluminum bullet traveling at 429 m/s strikes an armor plate and comes to a stop. What is the bullet temperature change in degrees Celsius
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