A discus thrower (arm length 1.1 m) starts from rest and begins to rotate counterclockwise with a constant angular acceleration of 1.7 rad/s2. (a) How many radians of angle does it take for the discus thrower's angular velocity to reach 5.7 rad/s

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

This is the substance(s) formed in a chemical reaction.

Two forces produce equal torques on a door about the door hinge. the first force is applied at the midpoint of the door; the second force is applied at the doorknob. both forces are applied perpendicular to the door. which force has a greater magnitude?