What is efficiencywhat is the formula of mechanical advantage and velocity ratio of labour

Multiple Choice Qu 1. The velocity is defined as

A lightweight string is wrapped several times around the rim of a small hoop. If the free end of the string is held in place and the hoop is released from rest, the string unwinds and the hoop descends.

Why can an object still be seen when it is at absolute zero?

From whom should a departing VFR aircraft request radar traffic information during ground operations?

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

For each of the following, describe the relationship as directly or inversely proportional: a) wavelength vs. frequency b) wavelength vs. energy c) frequency vs. energy ... ?

Can hand sanitizer be used as rubbing alcohol

Two objects experience a 12 N electrical force between them. What force will the objects experience if the distance between them is doubled?

a submarine moving directly upward in the water at constant speed. The weight of the summer and it is 500,000 N. The submarines motors are off. The magnitude of the buoyant force acting on the submarine is

If the car went 30 km west in 25 min. and then 40 km east in 35 min., what would be its total displacement?