5 J
10 J
20 J
4 Reena is skating on an ice rink, which has a horizontal surface.
She follows a circular path of radius 5 metres and centre \(O\)
She completes 10 full revolutions in 1 minute, moving with a constant angular speed of \(\omega\) radians per second.
The mass of Reena is 40 kg
4
- Find the value of \(\omega\)
4 - Find the magnitude of the horizontal resultant force acting on Reena.
4
- (ii) Show the direction of this horizontal resultant force on the diagram below.
\includegraphics[max width=\textwidth, alt={}, center]{78120346-4a16-4545-925a-d6fab4b750e9-03_380_442_2017_861}
5 An impulse of \(\left[ \begin{array} { r } - 5
12 \end{array} \right] \mathrm { N } \mathrm { s }\) is applied to a particle of mass 5 kg which is moving with velocity \(\left[ \begin{array} { l } 6
2 \end{array} \right] \mathrm { m } \mathrm { s } ^ { - 1 }\)
5 - Calculate the magnitude of the impulse.
5
- Find the speed of the particle immediately after the impulse is applied.