If you have to apply 40 n of force to a crowbar to lift a rock that weighs 400 n, what is the actual mechanical advantage of the crowbar?

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

Which is the most accurate name for the covalent compound p2o3?

Does the distance travelled by an oscillating mass between times t=0 and t2 equal the displacement of the particle over the same time period if t2> t/2? hint: consider a sine wave starting at t1=0, then consider a closing wave starting at t1=0, for your explanation.