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4 years ago

An object has a velocity of 8 m/s and a kinetic energy of 480 j. what is the mass of the object?

2 answers:

6 0

Hello!

We have the following data:

KE (Kinetic Energy) = 480 J
m (mass) = ? (in Kg)
v (speed) = 8 m/s

<span>Formula to calculate kinetic energy:

</span> $KE = \frac{1}{2} *m*v^2$
<span>
Solving:

</span> $KE = \frac{1}{2} *m*v^2$

$480 = \frac{1}{2} *m*8^2$

$480 = \frac{1}{2} *m*64$

$480*2 = 64*m$

$960 = 64m$

$64m = 960$

$m = \frac{960}{64}$

$\boxed{\boxed{m = 15\:Kg}}\end{array}}\qquad\checkmark$

allochka39001 [22]4 years ago

3 0

KE=1/2*m*v^2
So 480=1/2 * m * 8^2
480=1/2 * m * 64
480=32 * m
480/32=m
15=m

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4 years ago

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Answer:

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We need to calculate the magnitude and direction of the magnetic field produced by each wire first, using the formula

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And using the right-hand rule (thumb in the same direction as the current (to the right), other fingers wrapped around the thumb indicating the direction of the magnetic field lines), we find that the direction of the field lines at point P is inside the plane

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I = 5.90 A

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$B_2 = \frac{(4\pi\cdot 10^{-7})(5.90)}{2\pi(0.105)}=1.12\cdot 10^{-5}T$

And using the right-hand rule (thumb in the same direction as the current (to the left), other fingers wrapped around the thumb indicating the direction of the magnetic field lines), we find that the direction of the field lines at point P is also inside the plane

So both field add together at point P, and the magnitude of the resultant field is:

$B=B_1+B_2 = 7.6\cdot 10^{-6} T+1.12\cdot 10^{-5}T=1.88\cdot 10^{-5} T$

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3 years ago

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The reaction is <u>D. endothermic</u>.

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For example, an ice cube placed in the hand for some time starts to melt and it takes energy in the form of heat from the hand. This process always requires energy because of the breaking of existing and formation of new chemical bonds.

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3 years ago

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galina1969 [7]

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$\begin{gathered} r=\text{ 60.9 cm} \\ =\text{ 60.9}\times10^{-2}\text{ m} \end{gathered}$

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The magnitude of charge can be calculated by the formula

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