1 point 83. The line of action of Force F = (i - 2j) N passes through the point
whose vector is (-j + k) m. The moment of F about the origin in Nm is
O (2j + j)
(21 + i + k)
(i + i + k)
(i + 2) + k)

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?

Which describes increasing the efficiency of energy resource