Two forces act at a point the magnitude of the two forces 6,8 newton and the meas f the included angle between them \( \theta \in\left[0, \frac{\pi}{2}[\right. \), then the magnitude of their resul ould be equal \( \qquad \) newton. 5 (b) 10 (c) 12 (d) 16

14. A train moving at an average speed of \( 72 \mathrm{~km} / \mathrm{h} \) takes 15 seconds to completely cross a bridge that is 80 metres long (a) Express \( 72 \mathrm{~km} / \mathrm{h} \) in metres per second (b) Find the length of the train in metres ( 2 mk )

An object of mass 0.1 kg , which is fastened at one end of a cord of length L , is whirled about a vertical circle. The tangential speed of the object when the cord makes \( 53^{\circ} \) with the vertical and moving down is \( 5 \mathrm{~m} / \mathrm{s} \) and the tension in the cord at this time is \( \mathrm{T}_{1}=\mathrm{T} \). When the angle is reduced to \( 37^{\circ} \), the speed becomes \( 8 \mathrm{~m} / \mathrm{s} \) and the tension through the cord doubles. Find the length \( L \) and the tension T .

Sebuah mobil bermassa 1200 kg bergerak dengan kecepatan \( 20 \mathrm{~m} / \mathrm{s} \). Mobil tersebut kemudian direm hingga berhenti setelah menempuh jarak 50 meter. Berapakah gaya pengereman yang bekerja pada mobil tersebut?

A boat is supposed to travel with a velocity vector of \( \langle 40,30\rangle \), but the current has a velocity vector of \( \langle 0,-5\rangle \). What is the boat's actual velocity vector? \( \langle 45,30\rangle \) \( \langle 40,25\rangle \) \( \langle 40,35\rangle \)

La cantidad de un material radiactivo disminuye a la mitad cada 10 años. Si comenzamos con 80 gramos, ¿cuánto quedará después de 30 años?