What is the force needed to accelerate a sled with a mass of 2 kg at a rate of 3.0 m/s2 a 2.0 b 1.5 c 3.0 d 6.0

Which statement best describes resistance? resistance is a. how well a current will flow in a material and is measured in volts. b. how well a material conducts an electrical charge and is measured in ohms. c. the ability of a material to attract a positive charge to create a current. d. the ability of a material to repel neutral charges and is measured in ohms.

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?