A wheel rotating about a fixed axis has an angular position given by  = 3.0 − 2.0t 3 , where  is measured in radians and t in seconds. What is the angular acceleration of the wheel at t = 2.0 s? a. −1.0 rad/s2 b. −24 rad/s2 c. −2.0 rad/s2 d. −4.0 rad/s2 e. −3.5 rad/s2

Acoil formed by wrapping 80 turns of wire in the shape of a square is positioned in a magnetic field so that the normal to the plane of the coil makes an angle of 28.0° with the direction of the field. when the magnetic field is increased uniformly from 200 µt to 600 µt in 0.400 as, an emf of magnitude 80.0 mv is induced in the coil. what is the total length of the wire?

Ahypothesis is? close agreement by competent observers of observations of the same phenomena. a guess that has been tested over and over again and always found to be true. an educated guess that has yet to be proven by experiment. the long side of a right triangle. a synthesis of a large collection of information that includes guesses.

Which of the choices are parts of an atom? select all that apply. a.) compound b.) electron c.) neutron d.) molecule e.) photon f.) proton g.) element