An electric motor is a device that converts 1 to 2 . An electromagnet, or the 3 of the motor is placed within the
4 of the permanent magnets. The magnetic poles of the
armature 5 away from the 6 magnetic poles of the
7 magnets. The armature continues to rotate due to the
magnetic 8 . The part that 9 the current flow through
an electric motor is the 10 , it has 11 an attached
rings on the ends of the 12 wire. When it moves, the
commutator 13 past two contact points called 14
that connect the commutator to the 15 source.

A. Electrical energy B. Rotate C. Similar D. Voltage E. Loop F. Armature
G. Brushes H. Commutator I. Permanent J. Magnetic field K. Mechanical energy
L. Reverses M. Two (2) N. Slides O. Repulsion

There is a theory that indicates that dinosaurs became extinct when about 65 million years ago, a large asteroid hit the earth surface. dust caused by this collision blocked the sunlight reaching the earth's surface and many forms of life became extinct due to the cold. fearing this threat, how large the radius of an asteroid should you be looking for if the dangerous asteroid size is approximately the same as the one that killed the dinosaurs? available data suggests that about 18% of that asteroid's mass ended up as a dust spread evenly over earth after eventually settling out of the upper atmosphere. about 0.0180 g/cm^2 of dust, which is chemically different than the earth's rock, covered the earth's surface. typical asteroids have a density of about 1.9 g/cm^3. now that we know the size of the asteroid, how much energy was released during impact, assuming all of it was just the kinetic energy of the asteroid right before the impact?

Ahot-air balloonist, rising vertically with a constant speed of 5.00 m/s releases a sandbag at the instant the balloon is 40.0 m above the ground. after it is released, the sandbag encounters no appreciable air drag. compute the velocity of the sandbag at 0.250 s after its release.

3. a worker pushes a 30.5 kg polished stone along a polished table with a force on bonin a straight line for 5.20 s after starting from rest. there is no friction between thestone and the table. at the end of the table. the stone is hooked to a cable with a lengthof 62.0 cm to rotate it to a rough table to store until they can be picked up. the roughtable has a coefficient of static friction 0.702 with the polished stone. remember that 8= 9.80 m/s2a) what is the speed of the stone when it is hooked to the cable? b) what is the tension in the cable while the stone is rotating? (there is still nofriction)c) how much force is needed to make the stone begin sliding from rest on therough table? ius = 0.70262.0 cm30.5 kg20.5 kg6= 0