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liubo4ka [24]
3 years ago
11

If it requires 7.0 J of work to stretch a particular spring by 1.8 cm from its equilibrium length, how much more work will be re

quired to stretch it an additional 3.6 cm?
Physics
1 answer:
belka [17]3 years ago
8 0

Answer:

56 J

Explanation:

The following data were obtained from the question:

Energy 1 (E₁) = 7 J

Extention 1 (e₁) = 1.8 cm

Extention 2 (e₂) = 1.8 + 3.6 = 5.4 cm

Energy 2 (E₂) =?

Energy stored in a spring is given by the following equation:

E = ke²

Where E is the energy.

K is the spring constant.

e is the extension.

E = ke²

Divide both side by e²

K = E/e²

Thus,

E₁/e₁² = E₂/e₂²

7/ 1.8² = E₂/ 5.4²

7 / 3.24 = E₂/ 29.16

Cross multiply

3.24 × E₂ = 7 × 29.16

3.24 × E₂ = 204.12

Divide both side by 3.24

E₂ = 204.12 / 3.24

E₂ = 63 J

Thus, the additional energy required can be obtained as follow:

Energy 1 (E₁) = 7 J

Energy 2 (E₂) = 63 J

Additional energy = 63 – 7

Additional energy = 56 J

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8 0
3 years ago
Serena Williams has an average serve speed of 47 m/s. Find the mass of the tennis ball if its kinetic energy is 65 J.
avanturin [10]

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Explanation:

3 0
3 years ago
A stiff wire 44.0 cm long is bent at a right angle in the middle. One section lies along the z axis and the other is along the l
Helga [31]

The magnitude of force acting on wire will be 1.90 N and the direction of the force acting on the wire will be 41.9 degrees below the negative y axis.

Explanation:

It is known that the force acting on a current carrying conductor placed in a magnetic field is

F=BIL sin theta

Here B is the magnetic field, I is the current flowing through the wire and L is the length of the wire which is given as 44 cm.

Since the wire is bended in the middle at right angle so the length of the two sides of the wire will be 22 cm each. Also one part is lying over z axis and another part lies in the plane of xy in the equation of line y = 2x. So the slope of this wire will be

\frac{y}{x} =2

This will be equal to tan θ.

So θ = tan⁻¹ (2) =63.4°

Then, the length of the wire will be written as components of i, j and k.

L = (-22)k+(22) cos ( 63.4) i+(22) sin (63.4)j

L = 0.098 i+0.197 j-0.22k

Then,

F = I (L × B)

F = 20.5 ((0.0985 i + 0.197 j -0.22k) * (0.316 i))

F = 20.5 (\left[\begin{array}{ccc}i&j&k\\0.098&0.197&-0.22\\0.316&0&0\end{array}\right] )

F = 20.5(i(0)-j(0-(-0.22*0.316))+k(0-(0.316*0.197))) = 20.5(-0.069 j-0.062 k)

F = -1.415 j-1.271 k

The magnitude of force on the wire will be

F = \sqrt{(-1.415)^{2}+(-1.27)^{2}  } = \sqrt{3.615}=1.90 N

And the direction can be found by the tan inverse of the ratio of k component to j component of the force.

theta = tan-1(\frac{-1.271}{-1.415})= 41.9 degrees

So the magnitude of force acting on wire will be 1.90 N and the direction of the force acting on the wire will be 41.9 degrees below the negative y axis.

5 0
4 years ago
when a charge of 1 C has an electric PE of 1 J, it has an electric potential of 1 V. When a charge of 2 C has an electric PE of
matrenka [14]
1 volt. 
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7 0
3 years ago
A rock is dropped at the same instant that a ball at the same height is thrown horizontally. which will will have the greater sp
Svetach [21]
They will both hit the ground at the same time due to gravity.
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however, the ball traveled farther
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so the greater the distance, the greater the speed

the ball traveled faster in the same time so it traveled faster

answer is ball

5 0
3 years ago
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