How the forces are working?

Potassium Permanganate is used for purifying drinking water, because A. it is a sterilising agent B. it dissolves the impurities of water C. it is a reducing agent D. it is an oxidising agent

A typical set of stairs is angled at 38∘. You climb a set of stairs at a speed of 3.3 m/s. 1). How much height will you gain in 3.6 s? 2). How much horizontal distance will you cover in 3.6 s?

Which type of ladder has flat steps, hinged back, self-supporting, and non-adjustable?

Which of the following is not a type of energy conversion process? a. hydroelectric dam c. windmills b. solar cell d. all are energy conversion processes

What determines the Frequency of a wave? A. The medium the wave travels through. B. The amplitude or C. loudness of the wave. The source of the wave.

At the beach, describe where or when you would see wave fronts. How are wave fronts useful to surfers?

How would the moon appear from earth if the moon did not rotate?

Block B has mass 4.00 kg and sits at rest on a horizontal, frictionless surface. Block A has mass 2.00 kg and sits at rest on top of block B. The coefficient of static friction between the two blocks is 0.400.

T=2π√ (l/g) is dimensionally correct

A penny falls from a windowsill which is 25.0 m above the sidewalk. How much time does a passerby on the sidewalk below have to move out of the way before the penny hits the ground?