Una persona cuyo peso es de 588 N sube por una escalera que tiene una longitud de 17 m hasta llegar a una altura de 10 metros.

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?