A 38 kg boy standing initially motionless on frictionless ice throws a 3.6 kg rock away from himself at a speed of 5.4 m/s. What is the boy speed after he throws the rock?

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

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.

Which of the following is an example of motion in two dimensions?