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sineoko [7]
3 years ago
11

If the work put into a lever is 930 joules and the work accomplished is 870 joules, the efficiency of the lever is _____.

Physics
2 answers:
77julia77 [94]3 years ago
5 0
♥ C) 94%
♥ If the work put into a lever is 930 joules and the work accomplished is 870 joules, the efficiency of the lever is 94%.
♥ <span>870/930=93.5
</span>♥ And rounded you get 94.
Dmitriy789 [7]3 years ago
4 0

The correct answer to this question is C) 94%.

CALCULATION:

As per the question, the work put into a lever is 930 Joule.

Hence, input work W = 930 Joule.

Work accomplished by the lever is 870 Joule.

Hence, the output work W' = 870 Joule.

We are asked to calculate the efficiency of the level.

The efficiency of the lever is defined as the ratio of output work to the input work.

Mathematically efficiency \eta=\ \frac{W'}{W}

                                                =\ \frac{870\ J}{930\ J}

                                                 =\ 0.935

       In percentage, efficiency =\ 0.935\times 100

                                                 =\ 93,5\%

                                                 =\ 94\%                   [ans]

Hence, the efficiency of the lever is 94%.

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8 0
3 years ago
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Assuming a 8 kilogram bowling ball moving at 2 m/s bounces off a spring at the same speed that had before bouncing what is the a
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a) 32 kg m/s

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p_i = m u = (8 kg)(2 m/s)=16 kg m/s

The ball bounces off at the same speed had before, but the new velocity has a negative sign (since the direction is opposite to the initial direction). So, the new momentum of the ball is:

p_{fB}=m v_b =(8 kg)(-2 m/s)=-16 kg m/s

The final momentum after the collision is the sum of the momenta of the ball and off the spring:

p_f = p_{fB}+p_{fS}

where p_{fS} is the momentum of the spring. For the conservation of momentum,

p_i = p_f\\p_i = p_{fB}+p_{fS}\\p_{fS}=p_i -p_{fB}=16 kg m/s -(-16 kg m/s)=32 kg m/s


b) -32 kg m/s

The change in momentum of bowling ball is given by the difference between its final momentum and initial momentum:

\Delta p=p_{fb}-p_i=-16 kg m/s - 16 kg m/s=-32 kg m/s


c) 64 N

The change in momentum is equal to the product between the average force and the time of the interaction:

\Delta p=F \Delta t

Since we know \Delta t=0.5 s, we can find the magnitude of the force:

F=\frac{\Delta p}{\Delta t}=\frac{-32 kg m/s}{0.5 s}=-64 N

The negative sign simply means that the direction of the force is opposite to the initial direction of the ball.


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5 0
3 years ago
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vivado [14]

Answer:

The correct option is;

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On the left the y-axis represents the sea surface temperature anomaly while on the right, the y-axis represents the cholera incidence anomaly (%).

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leonid [27]

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5 0
2 years ago
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maks197457 [2]

Answer:

B) Tommy had a positive acceleration between noon and 12:30 pm.

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In the problem,

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So Tommy's acceleration is

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