Example 1: Calculate the gravitational force if the mass of the sun is \( 1.99 \times 10^{\wedge} 30 \mathrm{~kg} \) and earth is \( 5.97 \times 10^{\wedge} 24 \mathrm{~kg} \) separated by the distance \( 1.5 \times 10^{\wedge} 11 \mathrm{~m} \) ?(Gravitational constant \( \mathrm{G}=6.673 \times 10^{\wedge}-11 \mathrm{Nm} 2 / \) Kg 2 ) \( \quad \) Edited 19:23

A ball is dropped from a height of 2 metres and bounces \( 80 \% \) of its previous height on each bounce. (1) When it hits the ground for the \( 8^{\text {th }} \) time, what distance has it travelled? (2) How high off the floor is the ball after the \( 8^{\text {th }} \) bounce?

Tukarkan \( 18 \mathrm{~km} / \mathrm{min} \) per minit kepada \( \mathrm{m} / \mathrm{s} \) per saat. Convert \( 18 \mathrm{~km} / \mathrm{min} \) per minute to \( \mathrm{m} / \mathrm{s} \) per second. \( \begin{array}{ll}\text { A } 0.2 & \text { C } 2 \\ \text { B } 0.5 & \text { D) } 5\end{array} \)

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.

show that \( (u \times v) \bullet w=(v \times w) \bullet u=(w \times u) \bullet v \) 5. If \( u=2 i+4 j+8 k, v=2 i-3 j-6 k \) and \( w=5 i+4 j+8 k \) then show that \( (u \times v) \bullet w=(v \times w) \bullet u=(w \times u) \bullet v \)

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