The figure below shows a block launching mechanism. A small block of mass m slides down a frictionless ramp with a small, circular section of radius R. Once launched, no air resistance acts on the block. Using the vector directions on the right of the figure, which arrow best indicates the direction of the net force acting on the block at point A? A R Select one: A) 4 B) 5 C) 3 D) 1 E) 2 The Figure below shows a ninja standing near the edge of a turntable as seen from above and rotating with it. The turntable has a negative angular velocity ($\omega < 0$) and a positive angular acceleration ($\alpha > 0$). Which vector represents the direction of the total acceleration of the ninja? 1 2 3 4 5 OA 4 OB 5 OC 1 OD 2 OE 3 CW a
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A block of mass m is sliding off a radius R, and once launched, there is no net force acting on the block at point A. The figure provided shows a rotating object with a clockwise (CW) direction. Show more…
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Sri K.
Centrifugal force of inertia is directed outward along radial line, thus the sought work $$ A=\int_{r_{1}}^{r_{2}} m \omega^{2} r d r=\frac{1}{2} m \omega^{2}\left(r_{2}^{2}-r_{1}^{2}\right)=0 \cdot 20 \mathrm{~T} \text { (On substitution) } $$
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