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Consider a stick of length 1 meter and mass 600 grams lying on ice. You pull at one end of the stick, at a right angle to the stick, with a force of 25 N, causing the stick to rotate clockwise. Assume that friction with the ice is negligible. What is the rate of change of the angular speed? The moment of inertia of a rod of mass M and length L about its center of mass is ML2/12.
Biological muscle cells can be thought of as nanomotors that use the chemical energy of ATP to produce mechanical work. How much work is done by such proteins
A 0.280 kg croquet ball makes an elastic head-on collision with asecond ball initially at rest. The second ball moves off with halfthe original speed of the first ball. What is the mass of thesecond ball
You stand in the earth's magnetic field, directly facing its horizontal component (in other words, facing magnetic south). The field has a magnitude of 0.550 gauss and is directed 55.2° below the horizontal. Calculate the inward magnetic flux throu..
What is tension in each string
A current of 10.0 mA is maintained in a single circular loop with a circumferenceof 1.20 m. A magnetic field of 0.880 T is directed parallel to the plane of the loop. What is the magnitude of the torque exerted by the magnetic field on the loop?
A certain spring can withstand a maximum tension of 9.0 lbwithout breaking. What is the speed of the stone as the spring breaks
A father fashions a swing for his kids out of a long rope that he fastens to the limb of a tall tree. What is his angular speed
In 4 to 5 billion years, the Sun is expected to enter a red giant phase, in which its outer layers will gradually expand out beyond Earth's present orbit. If the Sun's angular momentum is conserved as it expands, and its mass doesn't change, will its..
A piece of radium has an activity of 18 mCi. What is the mass of the radium
A block weighing 15.0 N rests on the floor. What force does the floor exert on the block
A uniform electric field exists in the region between two oppositely charged parallel plates 1.59cmapart. Find the speed of the proton at the moment it strikes the negatively charged plate
A test rocket is fired perpendicularly upwards. It has a mass of 4.5 x10 4 kg and its engine can apply a force of 8.5 x10 7 N. The rocket is designed in such a way that the rocket fires until it reaches a height of 2.4 km. Compute the amount of wor..
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