A 55 kg ice skater is gliding along at 3.5 m/s. Five seconds later her speed has dropped to 2.8m/s. What is the magnitude of the kinetic friction acting on her skates?

A complete, unbroken path through which electric charges can flow is a (n) a. electric circuit. b. electrical resistance. c. magnetic field line. d. magnetic pole.

What is the difference between speed and velocity? A. Speed and velocity both measure an object's change in position per unit time, but velocity also depends upon the object's direction of motion. B.

What is the difference between "exercise" and "physical activity"?

The gravitational attraction between two objects will what is the object move further apart

Pure substances can be separated by physical means. A. True B. False

g The magnetic force on a charged particle A. depends on the sign of the charge on the particle. B. depends on the velocity of the particle. C. depends on the magnetic field at the particle's instantaneous position. D.

How fast must a 1000 kg car be moving to have a kinetic energy of 1.0 kWh

Which of the following is used to measure weight? Newtons Liters Kilograms Meters

Intravenous infusions are often made under gravity. At what height should the bottle be placed so the liquid pressure is 700 mm-H2O?

What conditions are required for nuclear fusion that prevent it from being used to generate electric energy?