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ElenaW [278]
4 years ago
14

An object's angular momentum changes by 10 kg-m2/s in 2.0 s. What magnitude average torque acted on this object? *

Physics
1 answer:
Colt1911 [192]3 years ago
5 0

Answer:

\tau=5N\cdot m

Explanation:

The first derivative of the angular momentum with respect to time is defined as the magnitude of the average torque acting on the particle:

\frac{dL}{dt}=\tau

So, we calculate the magnitude of the average torque, dividing the change of the angular momemtum into the time:

\tau=\frac{\Delta L}{\Delta t}\\\tau=\frac{10\frac{kg\cdot m^2}{s}}{2s}\\\tau=5N\cdot m

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GuDViN [60]

The kinetic energy of the cart is 16 J

Explanation:

The kinetic energy of an object is the energy possessed by the object due to its motion. Mathematically, it is calculated as:

K=\frac{1}{2}mv^2

where

m is the mass of the object

v is its speed

For the cart in this problem,

m = 8 kg is its mass

v = 2 m/s is its speed

Substituting, we find its kinetic energy:

K=\frac{1}{2}(8)(2)^2=16 J

Learn more about kinetic energy:

brainly.com/question/6536722

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7 0
3 years ago
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Lynna [10]

Answer:

1) Recollapsing universe

2) critical universe

3) Coasting universe

Explanation:

According to the smallest ration (ratio actual mass density to current density) to largest ration, rank of models for expansion of universe are

1) Recollapsing universe -in this, metric expansion of space is reverse and universe recollapses.

2) critical universe - in this, expansion of universe is very low.

3) Coasting universe -  in this, expansion of universe is steady and uniform

6 0
3 years ago
A tennis ball connected to a string is spun around in a vertical, circular path at a uniform speed. The ball has a mass m = 0.16
ycow [4]
We assign the variables: T as tension  and x the angle of the string
 The  <span>centripetal acceleration is expressed as v²/r=4.87²/0.9 and (0.163x4.87²)/0.9 = </span><span>T+0.163gcosx, giving T=(0.163x4.87²)/0.9 – 0.163x9.8cosx. 
</span>
<span>(1)At the bottom of the circle x=π and T=(0.163x4.87²)/0.9 – .163*9.8cosπ=5.893N. </span>
<span>(2)Here x=π/2 and T=(0.163x4.87²)/0.9 – 0.163x9.8cosπ/2=4.295N. </span>
<span>(3)Here x=0 and T=(0.163x4.87²)/0.9 – 0.163x9.8cos0=2.698N. </span>
<span>(4)We have T=(0.163v²)/0.9 – 0.163x9.8cosx.

</span><span>This minimum v is obtained when T=0 </span><span>and v verifies (0.163xv²)/0.9 – 0.163x9.8=0, resulting to v=2.970 m/s.</span>
4 0
3 years ago
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Analyze why we say an object is accelerating when we usually mean that it is speeding up and an object slowing down also is acce
dem82 [27]

(And don't forget that an object going around a curve at a constant speed is also accelerating.)

I believe there are two reasons:

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3 0
4 years ago
Which statement shows how to correctly convert from the mass of a compound in grams to the amount of that compound in moles?
expeople1 [14]

Answer:

mass (grams) x 1 =

molar mass (g/mol)

amount (moles)

Explanation:

6 0
4 years ago
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