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2 years ago

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Two objects gravitationally attract with a force of 70N. If the masses of both of the objects are increased by 15x and the dista

nce between their centers change by a factor of 12x, then the new force of attraction is ___ N.
a. 1.56 N
b. 109.38 N
c. 7.29 N
d. 1312.5 N

1 answer:

erastova [34]2 years ago

7 0

(B is the answer!!
I took the test and I got a 100! Hope this helps

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3 years ago

If it requires 4.5 J of work to stretch a particular spring by 2.3 cm from its equilibrium length, how much more work will be re

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Answer:

$\Delta W=24.1162\ J$

Explanation:

Given:

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additional stretch in the spring length, $\delta x=3.5\ cm=0.035\ m$

<u>We know the work done in stretching the spring is given as:</u>

$W=\frac{1}{2} \times k.\Delta x^2$

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k = stiffness constant

$4.5=0.5\times k\times 0.023^2$

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Now the work done in stretching the spring from equilibrium to ( $\Delta x+\delta x$ ):

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So, the amount of extra work done:

$\Delta W=W'-W$

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$\Delta W=24.1162\ J$

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2 years ago