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Mice21 [21]
3 years ago
13

A solid 0.7150-kg ball rolls without slipping down a track toward a loop-the-loop of radius r = 0.9150 m. what minimum translati

onal speed vmin must the ball have when it is a height h = 1.433 m above the bottom of the loop, in order to complete the loop without falling off the track?
Physics
1 answer:
sveticcg [70]3 years ago
7 0
<span>Answer: kinetic energy of a sphere is worth 0.7mV^2 at the top of the loop the sphere must have a tangential speed such that V^2/r = g in order to prevent it from falling dawn...so : V = âšg*r = âš9.8*0.915 = 3.00 m/sec in addition a further potential energy U = m*g*2r must be given to hold the sphere....this means that the total energy E the sphere must posses at the bottom of the loop is equal to : E = 0.7mV^2+m*g*2r = 0.475*(0.7*2.455^2+9.8*1.23) = 7.73 joule @ height H = 0.9133 m : E = 7.73 = m*g*H+0.7mVo^2 7.73 = 0.475*9.8*0.9133+0.475*0.7*Vo^2 Vo = âš(7.73 -(0.475*9.8*0.9133))/(0.475*0.7) = 3.23 m/sec</span>
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Answer: C and D

The equipment would have stayed in the same exact location indefinitely until the very moment the astronaut applied force to it.

The equipment will continue moving in the same direction indefinitely unless another force is applied to stop it.

Explanation: According to Newton's first law of motion which state that; A body at rest will continue to be at rest, or in linear motion will continue to move in a straight line, unless an external force act on it.

The equipment would have stayed in the same exact location indefinitely until the very moment the astronaut applied force to it.

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3 years ago
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The will dog catch up with the rabbit in 6 minutes assuming both their velocities remain constant during the chase.

<h3>What time will the dog catch the rabbit?</h3>

The time that the dog will catch up with the rabbit is given as follows:

Let the distance covered by the rabbit be x.

Distance covered by dog = x + 30

  • Time taken = distance/speed

The time taken will be the same T

  1. Time taken by dog, T = (x + 30)/10
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Equating both times.

(x + 30)/10 = x/5

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Solving for T in equation (ii);

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In conclusion, time is obtained as a ratio of distance and speed.


Learn more about time and speed at: brainly.com/question/26046491

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2 years ago
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