Analyze an uphill skier problem using work, energy, and power principles. See how gravitational potential energy, applied force, and friction determine the required work and power, and learn how speed ...

The Grain Belt Express line, meant to carry electricity from wind farms across the Midwest, faces an inquiry from the Missouri attorney general. By David Gelles An 804-mile-long transmission line in ...

We walk here, we walk there, we walk everywhere. Maybe you’re headed to work or to lunch in a busy city. You’re expending energy, and the exercise is good for you. But what if, on top of that, we ...