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A ball is thrown up at 13.0 m/s near the edge of a 30.0-meter high cliff. The ball lands at the bottom of the cliff.
a) What is the acceleration of the ball just after it is thrown (magnitude and direction)?
b) What is the acceleration of the ball at the peak of its trajectory (magnitude and direction)?
c) What is the velocity of the ball just before impact at the bottom of the cliff?
d) How much time after being thrown does the ball take to land?
A helium-neon laser emits light of wavelength 632.8 nm and has a power output of 2.0 mW. How many photons are emitted per second by this laser
A sign (mass 1700kg ) hangs from the end of a vertical steel girder with a cross-sectional area of 0.013m^2, What is the stress within the girder
A common measure for length in the publishing business is a point, defined as 1/72 inch. Illustrate what is an area of 0.50 gry squared in points squared? Round answer to the nearest hundreth.
The Hall effect can be used to determine the density of mobile electrons in a conductor, Find the density of mobile electrons in the material
As a spacecraft approaches a planet, the rocket engines on it are fired (turned on) to slow it down so it will go into orbit around the planet. compute how long (in minutes) must the engines be fired
A 0.80 kg body oscillates on a spring that, when extended 3.0 mm from equilibrium, has a restoring force of 5.0 N. find the angular frequency of oscillation
A 5.7x10^2 kg hot-air balloon takes off from rest at the surface of the earth. The wind and lift forces take the balloon up, doing +9.7 x 10^4 J of work on the balloon in the procedure. At what height above the surface of the earth does the balloo..
One generator uses a magnetic field of 0.15 T and has a coil area per turn of 0.050 m2. What magnetic field should be used in the second generator, so that its peak emf is the same as that of the first generator
The water level in a vertical glass tube 1.150 m long can be adjusted to any position in the tube. What is the greatest depth of water for which there will be resonance in the air in the tube
A cyclist rides a bike at 12.0 miles/hour. The diameter of the wheels is 70.0cm. (a) Through how many turns do the wheels spin for the 12.0mile trip, what is the bikes angular acceleration
Charges of 3.00 nC, -2.00 nC, -7.00 nC, and 1.00 nC are contained inside a rectangular box with length 1.00 m, width 2.00 m, and height 2.50 m. Outside the box are charges of 1.00 nC and 4.00 nC. What is the electric flux through the surface of th..
What fraction of the initial kinetic energy was transferred
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