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12345 [234]
3 years ago
8

A block with mass m =7.4 kg is hung from a vertical spring. when the mass hangs in equilibrium, the spring stretches x = 0.22 m.

while at this equilibrium position, the mass is then given an initial push downward at v = 3.8 m/s. the block oscillates on the spring without friction. 1 what is the spring constant of the spring?
Physics
1 answer:
kolbaska11 [484]3 years ago
8 0
This is given by F=kx.  Since a force due to gravity is given by F=mg this is F=7.4kg*9.81m/s^2 = 72.594N.  Put this force into the spring equation above and get 72.594N = k*0.22m.  Solve for k to get 329.97N/m
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Answer:

The work done by friction was -4.5\times10^{5}\ J

Explanation:

Given that,

Mass of car = 1000 kg

Initial speed of car =108 km/h =30 m/s

When the car is stop by brakes.

Then, final speed of car will be zero.

We need to calculate the work done by friction

Using formula of work done

W=\Delta KE

W=K.E_{f}-K.E_{i}

W=\dfrac{1}{2}mv_{f}^2-\dfrac{1}{2}mv_{f}^2

Put the value of m and v

W=0-\dfrac{1}{2}\times1000\times(30)^2

W=-450000
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W=-4.5\times10^{5}\ J

Hence, The work done by friction was -4.5\times10^{5}\ J

3 0
3 years ago
A force of 3 newtons moves a 10 kilogram mass horizontally a distance of 3 meters. The mass does not slow down or speed up as it
Mashutka [201]

Answer:

9 joules of heat energy was produced

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A 5 kg ball is sitting on top of a hill. It has a Potential Energy of 6000J. What is the height of the ball?​
natali 33 [55]

Explanation:

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6 0
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=>     t =  \frac{3.311 *10^{17} }{3.08 *10^{8}}

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=>   T  =  2* 34  +  2 + 2

=>   [tex]T  =72 \  years /tex]

4 0
3 years ago
high school physics, no need detail explain, just give the answer, but you have to make sure thank you
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Answer:many questions add point

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