Toxic or harmful best describes two substances that react to form salt.
<span>Answer:
KE = (11/2)mω²r²,
particle B must have mass of 2m, while A has mass m.
Then the moment of inertia of the system is
I = Σ md² = m*(3r)² + 2m*r² = 11mr²
and then
KE = ½Iω² = ½ * 11mr² * ω² = 11mr²ω² / 2
So I'll proceed under that assumption.
For particle A, translational KEa = ½mv²
but v = ω*d = ω*3r, so KEa = ½m(3ωr)² = (9/2)mω²r²
For particld B, translational KEb = ½(2m)v²
but v = ω*r, so KEb = ½(2m)ω²r²
so total translational KE = (9/2 + 2/2)mω²r² = 11mω²r² / 2
which is equal to our rotational KE.</span>
The efficiency of the appliance is 0.62 (62%)
Explanation:
The relationship between the power of the appliance and the energy used by it is
![P=\frac{E}{t}](https://tex.z-dn.net/?f=P%3D%5Cfrac%7BE%7D%7Bt%7D)
where
P is the power
E is the energy transferred in input
t is the time elapsed
For this appliance,
P = 7 W
So, in t = 42 s, the energy transferred in input is
![E_{in}=Pt=(7)(42)=294 J](https://tex.z-dn.net/?f=E_%7Bin%7D%3DPt%3D%287%29%2842%29%3D294%20J)
We are told that the useful energy in output however is
![E_{out}=183 J](https://tex.z-dn.net/?f=E_%7Bout%7D%3D183%20J)
Therefore, the efficiency of the appliance is
![\eta=\frac{E_{out}}{E_{in}}=\frac{183}{294}=0.62](https://tex.z-dn.net/?f=%5Ceta%3D%5Cfrac%7BE_%7Bout%7D%7D%7BE_%7Bin%7D%7D%3D%5Cfrac%7B183%7D%7B294%7D%3D0.62)
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Answer:
<em>You can increase the ideal mechanical advantage of an inclined plane by decreasing the angle of the inclined plane</em>
Explanation:
<u>Mechanical Advantage Of An Inclined Plane
</u>
Since the sloping surface of the inclined plane is always greater than its height, the ideal mechanical advantage of an inclined plane is always greater than 1. To compute the ideal mechanical advantage for an inclined plane, we divide the length of the incline by the height of the incline. For example, An inclined plane that is 10 meters long and 5 meters high has an ideal mechanical advantage of 2.
If we look at the inclined plane as a triangle formed with the height and the horizontal surface, the length L of the inclined plane is the hypotenuse of such triangle and h is the opposite leg of the angle formed with the floor. Since:
![\displaystyle sin\alpha=\frac{h}{L}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20sin%5Calpha%3D%5Cfrac%7Bh%7D%7BL%7D)
The mechanical advantage is
![\displaystyle MA=\frac{L}{h}=\frac{1}{sin\alpha}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20MA%3D%5Cfrac%7BL%7D%7Bh%7D%3D%5Cfrac%7B1%7D%7Bsin%5Calpha%7D)
As
decreases, its sine also decreases and the mechanical advantage (its reciprocal) will increase. Thus the answer is
<u>You can increase the ideal mechanical advantage of an inclined plane by decreasing the angle of the inclined plane</u>
Answer:
A. recycling allows resources to be reused, instead of dumped in landfills.
Explanation: