A bob is suspended from a crane by a cable of length l = 5 m. The crane and the bob are moving at a constant speed v0. The crane is stopped by a bumper and the bob on the cable swings out an angle of 60°. The initial speed v0 is
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The initial energy of the bob is all in the form of gravitational potential energy, and at the maximum angle of swing, all the initial energy is converted to kinetic energy. Show more…
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A bob is suspended from a crane by a cable of length $l=5 \mathrm{~m}$. The crane and the bob are moving at a constant speed $v_{0} .$ The crane is stopped by a bumper and the bob on the cable swings out an angle of $60^{\circ} .$ The initial speed $v_{0}$ is $\left(g=9.8 \mathrm{~m} / \mathrm{s}^{2}\right)$ (A) $10 \mathrm{~m} / \mathrm{s}$ (B) $7 \mathrm{~m} / \mathrm{s}$ (C) $4 \mathrm{~m} / \mathrm{s}$ (D) $2 \mathrm{~m} / \mathrm{s}$
A bob is suspended from a crane by a cable of length $l=5 \mathrm{~m}$. The crane and the bob are moving at a constant speed $v_{0}$. The crane is stopped by a bumper and the bob on the cable swings out an angle of $60^{\circ} .$ The initial speed $v_{0}$ is $\left(g=9.8 \mathrm{~m} / \mathrm{s}^{2}\right)$ (A) $10 \mathrm{~m} / \mathrm{s}$ (B) $7 \mathrm{~m} / \mathrm{s}$ (C) $4 \mathrm{~m} / \mathrm{s}$ (D) $2 \mathrm{~m} / \mathrm{s}$
A boat is pushed off from a beach at 2 m/sec. A man on shore holds a rope tied to the boat at a height of 2 m. Find how fast the angle of elevation of the rope is decreasing after 5 sec. Provide illustrations.
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