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nataly862011 [7]
3 years ago
13

A 0.25 kg steel ball is tied to the end of a string and then whirled in a vertical circle at a constant speed v. The length of t

he string is 0.62 m, and the tension in the string when the ball is at the top of the circle is 4.0 N. What is v
Physics
1 answer:
TiliK225 [7]3 years ago
7 0

Answer:

Explanation:

Let the tension in the string be T . At the top of the circle , total force acting on them = T + mg . This will provide centripetal force

T + mg = m v² / r

4 + .25 x 9.8 = .25 x v² / .62

6.45 = .25 v² / .62

v² = 16

v = 4 m /s .

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Speed equals distance divided by time (Speed=Distance/Time).

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What are not examples of velocity
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Explanation:

Acceleration roughly means “change in velocity.” If this change in velocity is consistently in one direction, the body will reach a point at which its velocity is zero.

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A force of 12 N changes the momentum of a toy car from 3kgm/s t0 10kgm/s. Calculate the time the force took to produce this chan
yan [13]

Answer:

Time = 0.58 seconds

Explanation:

Given the following data;

Initial momentum = 3 kgm/s

Final momentum = 10 kgm/s

Force = 12 N

To find the time required for the change in momentum;

First of all, we would determine the change in momentum.

Change \; in \; momentum = final \; momentum - initial \; momentum

Change \; in \; momentum = 10 - 3

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Now, we can find the time required;

Note: the impulse of an object is equal to the change in momentum experienced by the object.

Mathematically, impulse (change in momentum) is given by the formula;

Impulse = force * time

Making "time" the subject of formula, we have;

Time = \frac {impulse}{force}

Substituting into the formula, we have;

Time = \frac {7}{12}

Time = 0.58 seconds

6 0
3 years ago
If a reaction starts with 30 grams how many should it end with?
GrogVix [38]
30 grams because of conservation
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What do the top of a zip line and the top of a bungee cord have in common
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Answer:

They are both placed at high vantage points for an optimal experience.

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