3.31 - A "esteira rolante horizontal" do terminal de um aero- porto se move a \( 1,0 \mathrm{~m} / \mathrm{s} \) e tem \( 35,0 \mathrm{~m} \) de comprimento. Se uma mulher pisa em uma das extremidades e caminha a \( 1,5 \mathrm{~m} / \mathrm{s} \mathrm{em} \) relaçāo à plataforma móvel, de quanto tempo ela necessita para chegar à extremidade oposta, se andar (a) na mesma direção em que a plataforma se move? (b) Na direção oposta?

Select the statement(s) that accurately describe the energ, transformation described below. \( \square \) electrical energy to light energy \( \square \) electrical energy to thermal energy \( \square \) thermal energy to gravitational energy \( \square \) light energy to electrical energy \( \square \) electrical energy to potential energy

07. A bomb explodes under water at a depth of 352 m . If sound wave completes 110 cy till it reaches the surface of water, what will be the length of one compression of wave. \( \begin{array}{ll}\text { (1) } 3.2 \mathrm{~m} & \text { (2) } 1.6 \mathrm{~m} \\ \text { (3) } 0.8 \mathrm{~m} & \text { (4) } 0.4 \mathrm{~m}\end{array} \)

Мощность постоянного тока (в ваттах) вычисляется по формуле \( P=I^{2} R \), где \( I \) - сила тока (в амперах), \( R \) - сопротивление (в омах). Пользуясь этой формулой, найдите сопротивление \( R \), если мощность составляет \( 245 \mathrm{Bт} \), а сила тока равна 7 A . Ответ дайте в омах.

Review It! Select the statement(s) that accurately describe kinetic energ, \( \square \) energy that is in motion \( \square \) skater at the top of the skate ramp \( \square \) roller coaster going down a hill \( \square \) energy that is stored \( \square \) skier skiing down a ski slope

The path of a sledder is shown; upon descending the hill, the sledder ultimately glides up a ramp to a final resting position (at D). Frictional forces can be assumed to be negligible. Givent mass = 34.0 kg ; Height at \( \mathrm{A}=7.0 \) meters, \( \$ \) peed at \( \mathrm{A}=6.4 \) \( \mathrm{~m} / \mathrm{s} \),