Please need help Which of the following describes the molecules in a sample of water as the temperature of the water changes from 20°C to 30°C? A. The molecules speed up and their average kinetic energy increases. B. The molecules slow down and their average kinetic energy decreases. C. The molecules speed up and their average kinetic energy stays the same. D. The molecules slo w down and their average kinetic energy stays the same. following is the best example of heat transfer by radiation?

What is the radius of the circular path ofa charged particle in a magnetic field?

The ballistic pendulum was invented in 1742 by english mathematician benjamin robins. it consists of an initially stationary pendulum that moves after being struck by a bullet, and it is used to measure the original velocity of the bullet. the known variables are the bullet's mass m, the pendulum's mass m, and the height to which the block and bullet swing, determined by the length of the pendulum l and final angle θ. two principles of physics are necessary to solve for the bullet's original velocity. what are these principles? conservation of momentum and newton's third law conservation of energy and conservation of angular momentum grade summary deductions 0% potential 100% conservation of momentum and newton's second law. newton's second law and conservation of angular momentum. conservation of energy and newton's third law conservation of momentum and conservation of angular momentum. conservation of momentum and conservation of energy conservation of energy and newton's second law.

Bernie drove home from a vacation in 1.5 hours. he traveled a total distance of 60 miles. what was his average speed in miles per hour? a. 60 mph b. 90 mph c. 40 mph d. 55mph