4 years ago

Question 4 Unsaved If element X has 93 protons, how many electrons does it have? Your Answer:

Physics

1 answer:

9966 [12]4 years ago

8 0

It have 93 electrons

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A spool of thin wire (with inner radius r = 0.45 m, outer radius R = 0.60 m, and moment of inertia Icm = 0.8208 kg·m2) pivots on

makkiz [27]

Answer:

$E_L=4.667J$

Explanation:

The energy lost can be model by the energy equation in potential and kinetic energy in each step of the motion

Given: $r=0.45m$ , $R=0.60m$ , $I_m=0.8208 kg*m^2$ , $v=63.1cm/s$ , $m=1.3kg$

$E_p=m*g*r$

$E_p=1.3kg*9.8m/s^2*0.45m$

$E_p=5.733 J$

Kinetic energy:

$K_{Es}=\frac{1}{2}*I*w^2$ , $K_{Ep}=\frac{1}{2}*m*v^2$

$w=v^2/r$

Energy lost :

$E_p-K_{Es}-K_{Ep}=0$

$5.733J-\frac{1}{2}*0.8208kg*(\frac{(0.631m/s)^2}{0.45m})^2-\frac{1}{2}*1.3kg*(0.631m/s)^2=0$

$E_L=4.667J$

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Can energy be converted into matter

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As you look at the side of the wheel, you can see it spinning clockwise. What are the directions of the angular velocity, and an

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