7. PE=0.5×700n/m×0.9m^2
0.9^2=0.81m
0.5×700×0.81= 283.5J
8. 2000=0.5×(x)×1.5m^2
1.5^2= 0.25
0.25×0.5=0.125
2000=0.125 (x)
2000/0.125=x
x=16000 n/m
9. 4000=0.5 (375 n/m)×(x)^2
0.5×187.5 (x)
4000/187.5=21.3333333333
Answer: Technician A is correct
Explanation:
Technician B is wrong because decrease in resistance will surely cause increase in the flow of current.
As temperature rises, the number of phonons increases and with it the likelihood that the electrons and phonons will collide. Thus when temperature goes up, resistance
goes up. For some materials, resistivity is a linear function of temperature. The resistivity of a conductor increases with temperature.
Answer:
The distance between the helicopter and the man changing at that instant is 41.46 ft/sec.
Explanation:
Given:
Distance between the man and the helipad, = ft
Vertical distance between the helipad and the helicopter, = ft
Helicopter lift off vertically and is raising at a speed of 45 ft/sec.
That can be written as, = 45 ft/sec
Now from the diagram (attached with) we can find the hypotenuse of the triangle that is the distance between the man and the helicopter.
Applying Pythagoras theorem:
⇒
⇒
⇒
⇒ ft
Now to find the changing distance between the helicopter and the man we have to differentiate the Pythagoras theorem as dh/dt can be obtained from there.
And we know that the distance b is constant so db/dt=0.
Using chain rule and power rule of differentiation.
⇒
⇒
⇒
⇒ <em>....eliminating the common 2 </em>
⇒
⇒ Plugging the values.
⇒
⇒ ft/sec
So,
41.46 ft/sec is the distance between the helicopter and the man changing at that instant.
Answer:
hurricanes are the most awesome Violet storms on the earth people call the storms by other names such as typhoon or cyclone depending on where the car whatever they are called topical cologne all from the same way
Explanation:
so technically hurricanes are the most Violet storms
Kinetic energy =1/2 mv^2
<span>m=2ke/v^2 </span>
<span>m=2(34)/3.6^2 </span>
<span>m=5.24 </span>
<span>force normal = mg </span>
<span>=5.24 x 9.8 </span>
<span>force normal = 51.4N
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