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A .34 kilogram meter stick balances at its center. When a necklace is suspended from one end of the stick, the balance point moves 9.5 centimeters toward the end. find the mass of the necklace.
A falling skydiver has a mass of 108 kg. What is the magnitude of the skydiver's acceleration when the upward force of air resistance has a magnitude that is equal to one-third of his weight?
What is the magnitude of the change in momentum of the ball while in contact with the bat if the ball leaves with a velocity of (a) 20 m/s vertically downward, and (b) 20 m/s horizontally back towar
A moment of inertia of 389 kgm2 and a radius of 2 meters. Assuming the merry-go-round is initially at rest, what is its final angular velocity to three decimal places?
A 46 kg pole vaulter running at 11 m/s vaults over the bar. Her speed when she is above the bar is 0.7 m/s. The acceleration of gravity is 9.8 m/s2 . Find her altitude as she crosses the bar. Negle
IP A point charge = 4.0 is placed at each corner of an equilateral triangle with sides 0.28 in length. What is the magnitude of the electric field at the midpoint of any of the three sides of the t
A listener is positioned in front of the two speakers and on the line separating them, thus creating a constructive interference at the listener's ear. If one of the speakers is gradually pushed tow
You've recently read about a chemical laser that generates a 20-cm-diameter, 27.0 MW laser beam. One day, after physics class, you start to wonder if you could use the radiation pressure from this l
The larger of the two stars has a mass of 3.00 1030 kg, and its center is 2.60 1011 m from the system's center of mass. What is the mass of the smaller star?
One recent study has shown that x rays with a wavelength of 0.0050 nm can produce mutations in human cells. a) Calculate the energy in eV of a photon of radiation with this wavelength.
At what velocity would a spacecraft have to be moving for a radio station on Earth transmitting at 100MHz to be picked up by a radio tuned to 100.4MHz ?
An 81 g arrow is fired from a bow whose string exerts an average force of 95 N on the arrow over a distance of 75 cm. What is the speed of the arrow as it leaves the bow?
How many grams of aluminum at 90degrees C would have to be dropped into a hole in a block of ice at 0.0degrees C to melt 10 g of ice?
Both masses rotate on the table making 100 revolutions per minute. m1=m2=1kg. What is the centripetal acceleration of m1 and m2?
Why is the surface wind always directed at some angle across the sea-level isobars toward lower pressure? Why is the surface wind directed across the sea-level isobars at a greater angle in Madison
Two astronauts, one of mass 65 and the other 83 , are initially at rest in outer space. They then push each other apart. How far apart are they when the lighter astronaut has moved 11 ?
The speed of sound in water is 1501 m/s. A sonar signal is sent from a ship at a point just below the water surface and 2.5 s later the reflected signal is detected. How deep is the ocean beneath th
Why is it that a car that falls from the top of a 50 story building will hit a safety net below no faster. What is the conventional name of the vector you have drawn?
A steel ball is dropped from a height of three meters onto a concrete floor. It bounces a large number of times but eventually comes to rest. Estimate the ball's rise in temperature.
The Doppler shift was first tested in 1845 by the French scientist B. Ballot. He had a trumpet player sound a 384 Hz note while riding on a flat-car pulled by a locomotive. At the same time, a stati
Two astronauts, one of mass 61 kg and the other 80 kg, are initially at rest in outer space. They then push each other apart. How far apart are they when the lighter astronaut has moved 15 m?
A cylinder is rolling along the ground without the slipping at 7m/s. It comes to a hill and begins going up. Assuming no losses to friction, how high vertically will it go before it stops?
What is the angular diameter of such a black hole as seen from a distance of 45 AU, the closest that the star SO-16 comes to Sagittarius A*?
Two conducting spherical shells are concentric, with radii of 0.30 m and 1.70 m. The electric potential of the inner shell, with respect to the outer shell, is +730 V.
The estimated mass of the black hole at the galactic center. Give your answer in both kilometers and astronomical units.