A boy uses a force to keep a rock from falling. (He is carrying the rock.) Some forces, like this one, act only when two objects are touching. Which force usually acts between objects that are NOT touching?

A. friction

B. gravity

C. pulling

D. pushing

So who am i? I mean reall who am i

What allows objects that do not make their own light able to be seen?

A car travels 100 km in the first two hours, stops for half an hour and then travels 200 km in the next four hours. Find the average speed of the car

One way to force air into an unconscious person's lungs is to squeeze on a balloon appropriately connected to the subject. What force must you exert on the balloon with your hands to create a gauge pressure of 4.

In multicellular organisms, cells and organ systems are specialized to perform specific tasks. For example, the respiratory system in animals and the shoot system in plants allow these organisms to take in the atmospheric gases they need and release

Two football players collide on the field. Before the collision, their total momentum was 450 kgm/s to the north. What is their total momentum after the collision? A. More than 450 kgm/s north B. 450 kgm/s north C. Less than 450 kgm/s north D.

Jane and John Doppler effect

If you combine 430.0 ml of water at 25.00 °c and 140.0 ml of water at 95.00 °c, what is the final temperature of the mixture? use 1.00 g/ml as the density of water. s

While working out, a man performed 200 j of work in 3 seconds. What was his power?

A funnel-shaped low pressure closure