pe un plan inclinat de unghi alfa= 30 de grade se afla un corp de masa m-=50 kg , asupra caruia actioneaza o forta orizontala F = 294 N . Neglijand frecarile , sa se calculeze acceleratia de miscare a corpului si forta cu care apasa asupra pamantului

1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?

Aplayground slide is 8.80 ft long and makes an angle of 25.0° with the horizontal. a 63.0-kg child, initially at the top, slides all the way down to the bottom of the slide. (a) choosing the bottom of the slide as the reference configuration, what is the system's potential energy when the child is at the top and at the bottom of the slide? what is the change in potential energy as the child slides from the top to the bottom of the slide? (include the sign of the value in your answer.)

The flow of electrons from one atom to another is called