You drop a 30 g pebble down a well. You hear a splash 2.7 s later. What was the pebble's speed just as it reaches the water? Assume g = 9.8 m/s2

What will oppose most forces and slow objects

The trajectory of charged particles in an electric field a. must be along the electric field line always. b. must be tangential to the electric field line. c. is always circular. d. must be perpendicular to the electric field line. e.

Astronomers want to study a star in the Andromeda galaxy, the closest galaxy to our own. Which instrument has the advanced technology needed to study such a far-off object? Select three options. A. rover B. probe C. satellite D. space station E.

Two identical billiards balls strike a rigid wall with the same speed but at diffrent angle and gets reflected with out change in speed what is (i) the ratio of the magnitudes implulse generated?

A 160-n child sits on a light swing and is pulled back and held with a horizontal force of 100 n. the magnitude of the tension force of each of the two supporting ropes is:

A Heavy crate applied a force of 1500 N on a 25m2 piston. What force needs to be applied on a 0.8m2 piston to lift the crate?

The mass of your new motorcycle is 250kg on earth

Which of the following statements best describes the relationship between force and work? a. Work equals force divided by distance. b. Force and work are two terms for the same thing. c. Work is equal to certain forces, like gravity and friction. d.

A herringbone or tire track pattern on a radiograph is a result of

A 7150-kg railroad car travels alone on a level frictionless track with a constant speed of 24.5 m/s. A 3100-kg load, initially at rest, is dropped onto the car What will be the car's new speed?