In a ballistics test, a 25 g bullet traveling horizontally at 1200 m/s goes through a 30-cm-thick 400 kg stationary target and emerges with a speed of 930 m/s. The target is free to slide on a smooth horizontal surface. (a) How long is the bullet in the target?
What average force does it exert on the target?
(b) What is the target's speed just after the bullet emerges?

To travel at constant speed, a car engine provides 24kw of useful power. the driving force on the car is 600n. at what speed does it travel?

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.