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A dynamite blast at a quarry launches a rock straight upward, and 2.3 s later it is rising at a rate of 18 m/s. Assuming air resistance has no effect on the rock, calculate its speed
(a) at launch and
(b) 5.3 s after launch.
What is the torque on the root of the tooth about point A.
What is the least (non-zero) thickness for the air layer between two flat, and parallel, glass surfaces if the glass is to appear dark while 640 nm light is incident normally? What if the glass is to appear bright.
A 710 kg car stopped at an intersection is rear-ended by a 1800 kgtruck moving with a speed of 16 m/s. If the car was in neutral andits brakes were off, so that the collision is estimated elasticfind the final speed of the truck. Find the final sp..
The springs of a 1700-kg car compress 4.90mm when its 63.0-kg driver gets into the driver's seat. If the car goes over a bump
Draw a free body diagram for the skydiver in the instant after he jumps.(Assume that at this point his velocity is near zero so that air resistance is still negligible.)
Assume that positive -axis is directed toward the direction of motion of cart 2.
Three insulating balls are suspended from thin threads. Various objects are then rubbed against other objects and each of the insulating balls is charged by touching them with one of these objects. In each case.
A 1210-N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end.
The skis have a thrust of 220 N. Sam's speed at the bottom is 45.0 {rm m/s}. Illustrate what is the coefficient of kinetic friction of his skis on snow?
If you had been tasked to remove the water from New Orleans after Hurricane Katrina would you select a radial flow, mixed flow or axial flow pump for this purpose? Explain it briefly.
State the amplitude of the electric field vector in micro volts per meter to three significant figures.
A single-turn circular loop of radius 8.00 cm is to produce a field at its center that will just cancel the earth's field of magnitude 0.7G directed at 70 below the horizontal north direction. Find out the current in the loop.
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