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A kid of mass 30 kg is initially at the center of a merry-go-round, which we can model as a uniform disk. The mass of the merry-go-round is 150 kg and it has a radius of 2.0 m. The merry-go-round initially has an angular speed of 20 rev/min. The kid begins to crawl radially from the center, gets tired, and stops at 0.33 m from the edge. What is the angular speed of the merry-go-round now in rev/min?
Explain why the electron density of hydrogen is very nearly 6x10^26 electrons/kg. Explain why the electron density of all other low atomic number materials is nearly 3 x 10^26 electrons/kg. speculate why the electron density of materials might differ..
A small particle has charge -2.30\mu C and mass 3.00×10^-4kg . It moves from point A, where the electric potential is V_A = 120V , to point B, What is its speed at point B
The distance between the objective and eyepiece lenses in a microscope is 24cm, What eyepiece focal length will give the microscope an overall angular magnification of 350
A man with mass m1 = 66.0 kg stands at the left end of a uniform boat with mass m2 = 177.0 kg and a length L = 3.5 m. What is the location of the center of mass of the system
A hunter aims directly at a target (on the same level) 89.1 away. At what angle should the gun be aimed so as to hit the target
a block slides down a friction less incline ramp. If the ramp angle is 15.0 deg and the length of it is 19.0 m, find the speed of the block as it reached the end of the ramp
A 539 Hz sound wave travels through a substance. What is the speed of sound in the substance
A camera flashtube requires 8J of energy per flash. The flash duration is 2m/ss}. What power does the flashtube use while it's flashing?
A bullet moving at 244 m/s strikes a tree and penetrates a distance of 8.34 mm before stopping. What was the average acceleration of the bullet as it slowed
A storage tank contains 21.6 kg of nitrogen (N_2) at an absolute pressure of 3.54 atm. What will the pressure be if the nitrogen is replaced by an equal mass of CO_2 ?
Two objects of mass m and 9m undergo a completely inelastic collision in one dimension. what was the ratio of their speeds before the collision
A car initially traveling eastward turns north by traveling in a circular path at uniform speed, Determine its average acceleration during the 30.0-s interval
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