A stone is whirled, the stone experience an inward force by string which is? \( \begin{array}{lll}\text { (a). centrifugal force } & \text { (b). proportional to square of speed } \\ \text { (c). tangent } & \text { (d). Inverse of square of speed } \\ \text { The revolutions in } 3 \text { pi radians } \\ \begin{array}{lll}\text { (a) } 2 & \text { (b) } 3 & \text { (c) } 3 / 2\end{array} \\ \text { The velocity of disc at the bottom of inclined plan is } \\ \begin{array}{lll}\text { (a) } \sqrt{g h} & \text { (b) } \sqrt{\frac{4 g h}{3}} & \text { (c) } \sqrt{\frac{3 g h}{4}}\end{array}\end{array} \$ \begin{array}{l}\text { (b) }\end{array} \)

A 0.25 kg apple falls from a tree to the ground, 4.0 m below. lgnore air resistance. Take ground level to be \( y=0 \).

3. Рассчитайте скорость шарика №1 в момент удара с шариком \( \mathrm{N}_{0} 2 \) \[ v_{1}=\sqrt{2 g h}, \quad v_{1}= \]

Какое утверждение является верным? А. \( \mathrm{F}_{\text {тр. покоя }}>\mathrm{F}_{\text {тр.качения }} \) Б. \( \mathrm{F}_{\text {тр. покоя }}=\mathrm{F}_{\text {тр. качения }} \) В. \( \mathrm{F}_{\text {тр. покоя }}<\mathrm{F}_{\text {тр. качения }} \) Г. \( \mathrm{F}_{\text {тр. покоя }}<0 \)

IP Suppose the pendulum bob in the figure(Eigure 1) has a mass of 0.33 kg and is moving to the right at point B with a speed of \( 3.0 \mathrm{~m} / \mathrm{s} \). Air resistance is negligible. Figure

If the mass of the bob is increased, does your answer to part (a) increase, decrease, or stay the same?