What early advance first increased the ability to communicate over long distances?

Trolley A has a mass of 2kg and is moving at 2m/s. It collides with trolley B, which has the same mass but is stationary. What is the momentum of the two trolleys after the collision?

Recall the observed behavior of the compass during the mapping of the magnetic field. Which of the following descriptions best matches the behavior you observed? Two correct answers required for full credit. A.

Suppose the energy transferred to a dead battery during charging is W. The recharged battery is then used until fully discharged again. Is the total energy transferred out of the battery during use also W?

Home Run 14. The hitter just hit the ball with the bat. He wants the ball to travel as straight and far as possible. a.

Rocket engineers use newton's third law during launch. identify the action force. A. exhaust gases push down on the earth B. rocket travels upward C. earth pushes back on the exhaust gases

The power of a machine measures A. its rate of doing work. B. its strength. C. the force it produces. D. the work it does.

the acceleration of gravity is 28 times on sun than earth. Imagine there is a space suit that let you stand on sun. Calculate the weight of 100 kg person on earth in newtons

A force of 20 n acts upon a 5 kg block, calculate acceleration of the object

What resultant force is needed to accelerate a train of mass 3.41000000 kg from rest to 15.0ms in exactly 20s

I to fall in love with someone or to at least get a boyfriend