As you pass a tractor-trailer truck on a highway, you notice that its trailer is slowly bouncing up and down on its springs. Is it more likely that the trailer is heavily loaded or nearly empty?

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

Why can blue light and yellow light combine to produce white light? question 17 options: they are both primary colors of light. they absorb each other's wavelengths. because blue, yellow, and white are primary colors. they are complementary colors of light.

Amira pulls a 3 pound wagon 4 feet. how much work has she done?