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A meter stick is held vertically with one end on the floor and is then allowed to fall. Find the speed of the other end when it hits the floor, assuming that the end on the floor does not slip. (Hin
A good baseball pitcher can throw a baseball toward home plate at 83 mi/h with a spin of 1625 rev/min. How many revolutions does the baseball make on its way to home plate? For simplicity, assume th
A person is to be fitted with bifocals. She can see clearly when the object is between 30 cm and 1.5 m from the eye. Assume that the glasses will be worn so that the lenses are 2.0 cm from her eyes.
(a) Find the rod's kinetic energy at its lowest position (b) Find how far above that position the center of mass rises.
Find the maximum angular velocity of the cylinder, i.e. just as the spring contracts back to its equilibrium length.
A uniform 30 kg ladder (length = 8.50 m) leans against a smooth vertical wall. The base of the ladder is 12 ft from the wall. If the coefficient of friction between the ground and the ladder is 0.15
What is the potential difference between electrodes? Express your answer using two significant figures.
A 2340 kg satellite used in a cellular telephone network is in a circular orbit at a height of 770km above the surface of the earth. What is the gravitational force on the satellite?What fraction is
the radius and height of the reactor as functions of the buckling so that the volume of the critical reactor is a minimum;
Calculate the concentrations in grams per liter of 235-U, 233-U, and 239-Pu required for criticality of infinite homogeneous mixtures of these fuels and the following moderators:
Charges q, q, and -q are placed on the x-axis of x=0, x=2m, and x=4m respectively. At which of the following points does the electric field have the greatest magnitude a) x = 1m b) x = 3m c) x = 5m
Express your answer with the appropriate units. What's the direction of the velocity of the third piece? Count counterclockwise from the x axis.
One possibility would be, r, (phi) and (alpha), where r and (phi) specify the position of the rod's CM relative to an origin half way between the springs on the ceiling, and (alpha) is the angle of
A mass of 20 kg is attached to a spring whose spring constant is 2000 N/m. The mass is displaced and released. The mass slides on a frictionless surface A. What is the period B. What is the frequen
If the system is moving so that the hanging mass is moving downward, then find the magnitude of the acceleration of each mass and the tension in the string.
An asteroid has a mass of 3.66 x 10^20 kg and a radius of 8.2 x 10^5 m. If a 25 kg mass is dropped from 10 m above the "ground" of the asteroid, how long will it take the mass to fall to the ground?
The lift force (due to the helium) on the balloon is 30 N. If the tension in the string exceeds 50 N of force, the string will break. How great a force (magnitude) can a horizontal wind apply to the
At what height, will the baloon be fully blown up? Will the baloon ever reach the height when it is fully blown up? If yes, what is the height? Please give me a detailed explanation as to how you ob
The value of W is about 4.24 eV for zinc. What is the maximum wavelength that light falling on the zinc can have if it is to be able to eject electrons? [For comparison, visible light has wavelength
If the distance between adjacent interference bright spots (for low n) is about 2.5 cm on the screen, what is the wavelength of the light involved?
The baloon is filled with so much helium that the net force exacted on it as well as the weight it is lifting is 30N. How many mol helium is there in the gas? Please give me a detailed explanation a
(It is made up of a square solenoid instead of round one bent into a doughnut shape.) What is the magnitude of the magnetic field inside the toroid at (a)the inner radius and (b)the outer radius?
The speed of the electron is 0.0609c (c = speed of light, equal to 2.998 x 108 m/s). Find the current i (in A) in the solenoid.
A 15.0g plastic ball is dropped from a height of 2.60 m and is moving at 2.80m/s just before it hits the floor How much mechanical energy was lost during the ball's fall?
What is the maximum number of passengers that can ride in the elevator? Assume that an average passenger has mass 65.0 kg . Express you answer as an integer.