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3 years ago

A box was pushed across a floor a distance of 6.5m against a frictional resistance of 7.3N. what work was done

Physics

1 answer:

Svet_ta [14]3 years ago

8 0

Answer:

I think the answer is friction

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Answer:

Helium

Explanation:

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You place a large pebble in a slingshot, pull the elastic band back to your chin, and release it, launching the pebble horizonta

sladkih [1.3K]

Answer:

The larger pebble has 25 times more mass.

Explanation:

To solve the exercise it is necessary to apply the work and energy conservation equations.

For the case described, the work done must be preserved and must be the same, that is,

$W = 0$

By definition work linked to the conservation of kinetic energy would be given by

$\Delta KE = W = 0$

$\Delta KE = 0$

$KE_{larger}-KE_{smaller} = 0$

$KE_{larger}=KE_{smaller}$

$\frac{1}{2}m_lv_l^2 = \frac{1}{2}m_sv_s^2$

$m_lv_l^2 = m_sv_s^2$

The ratio between the mass and the velocity would be,

$\frac{m_l}{m_s}=\frac{v_s^2}{v_l^2}$

$\frac{m_l}{m_s} = \frac{500^2}{100^2}$

$\frac{m_l}{m_s} = 25$

Therefore the answer is: The larger pebble has 25 times more mass.

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3 years ago

A wheel rotates 3 times. What is its angular displacement?

tia_tia [17]

Answer:

The angular displacement would be 6 Pi radians or 1080 degrees.

Explanation:

Every individual rotation is 2 Pi (this applies to anything regardless of radius).

Since there are three rotations you are going to multiply 2 Pi by 3.

This will give you 6 Pi which you can convert to equal 1080 degrees (1 Pi = 180 degrees).

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4 years ago

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What helps determine how easily magma flows?

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<span>the amount of silica in the magma</span>

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3 years ago

In the livingroom of your house you would like to run a 300 W stereo, a 30 W computer, a 960 W laser light projector, and two 12

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Answer:

12.75 A

Explanation:

The total power is 300 + 30 + 960 + 2 × 120 = 1530 W

Electrical power is given by

$P = IV$

Then

$I = \dfrac{P}{V}$

With a voltage of 120 V,

$I = \dfrac{1530}{120} = 12.75 \text{ A}$

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4 years ago

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A box was pushed across a floor a distance of 6.5m against a frictional resistance of 7.3N. what work was done​

A box was pushed across a floor a distance of 6.5m against a frictional resistance of 7.3N. what work was done