C because when the part gets out of the probe it would no longer stay contacted
A = .3*g = 2.94 m/s²
<span>t = v/a = 9/2.94 = 3.061 sec </span>
<span>W = E/t = ½mv²/t = ½*40*9²/3.061 = 529.2 watts</span>
When water changes into vapor, it is called evaporation. BONUS: This is formed by the boiling point of water, which is 230°F (Fahrenheit) or 110°C (Celsius).
Answer:
a) 1.2*10^{-3}cos(1.25t)
b) 0.49mV
Explanation:
a) The coil rotates periodically with period T. Hence, we can write the variation of the magnetic flux with a sinusoidal function, and with max flux NAB. Thus, we have that:
![\Phi_B(t)=NABcos(\omega t)\\\\\omega=\frac{2\pi}{T}=1.25\frac{rad}{s}\\\\A=l^2=(0.02m)^2=4*10^{-4}m^2\\\\B=0.1T\\\\\Phi_B(t)=1.2*10^{-3}cos(1.25 t) W](https://tex.z-dn.net/?f=%5CPhi_B%28t%29%3DNABcos%28%5Comega%20t%29%5C%5C%5C%5C%5Comega%3D%5Cfrac%7B2%5Cpi%7D%7BT%7D%3D1.25%5Cfrac%7Brad%7D%7Bs%7D%5C%5C%5C%5CA%3Dl%5E2%3D%280.02m%29%5E2%3D4%2A10%5E%7B-4%7Dm%5E2%5C%5C%5C%5CB%3D0.1T%5C%5C%5C%5C%5CPhi_B%28t%29%3D1.2%2A10%5E%7B-3%7Dcos%281.25%20t%29%20W)
where we have used the values given by the information of the problem for N B and A.
b)
the emf is given by:
![emf=-\frac{d\Phi_B}{dt}=-NBA\omega sin(\omega t)\\\\emf(t=12.5s)=-(30)(0.1T)(4*10^{-4})(1.25\frac{rad}{s})sin(1.25*12.5)=1.49*10^{-4}V=0.49mV](https://tex.z-dn.net/?f=emf%3D-%5Cfrac%7Bd%5CPhi_B%7D%7Bdt%7D%3D-NBA%5Comega%20sin%28%5Comega%20t%29%5C%5C%5C%5Cemf%28t%3D12.5s%29%3D-%2830%29%280.1T%29%284%2A10%5E%7B-4%7D%29%281.25%5Cfrac%7Brad%7D%7Bs%7D%29sin%281.25%2A12.5%29%3D1.49%2A10%5E%7B-4%7DV%3D0.49mV)
hope this helps!!
Motorcycle helmets are padded to give the rider the protection they require in case of accidents. Any hit to the head is absorbed by the padding and the rider is saved from any kind of fatal injury. Whenever a motorcycle rider falls from his motorcycle, there is every possibility that the head will hit the ground first. If the padding was not there, then the rider would get the direct impact of hitting. As most of the pressure of the hit gets absorbed by the inner padding of the helmet, so the rider is saved from the fatal accident. It does not mean that the driver will not have minor injuries but by all chance his life would be saved.