At t=0 , a runner is moving forward at a speed of 7 m/s for 2 s the runner accelerates to the left at 0.5 m/s2 and backward at 1 m/s2 . find the runners final velocity in terms of the company directions (forward/back and left/right). what is the runners speed at t=2 (the length of the resultant of the perpendicular velocity components)? what is the runners position at t=2?

Three point charges, two positive and one negative, each having a magnitude of 20 μc are placed at the vertices of an equilateral triangle (30 cm on a side). what is the magnitude of the electrostatic force on the negative charge

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.

Thermal radiation gets its name because