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Minchanka [31]
3 years ago
6

A car traveling 85 km/h is 250 m behind a truck traveling 73 km/h.

Physics
1 answer:
amm18123 years ago
8 0

Time needed = t = 20.83 s

<h3>Further explanation</h3>

Given

car speed = 85 km/h

truck speed = 73 km/h

Required

the time it takes for the car to reach the truck

Solution

When the car reaches the truck, the distance between them will be the same

x car - 250 m = x truck

General formula for distance (d) :

d = v.t

So the equation becomes :

85t-250 = 73t

12t=250

t = 20.83 s

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How much charge can be placed on a capacitor with air between the plates before it breaks down if the area of each plate is 4.00
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Explanation:

Let us assume that the separation of plate be equal to d and the area of plates is 9 \times 10^{-4} m^{2}. As the capacitance of capacitor is given as follows.

            C = \frac{\epsilon_{o}A}{d}

It is known that the dielectric strength of air is as follows.

               E = 3 \times 10^{6} V/m

Expression for maximum potential difference is that the capacitor can with stand is as follows.

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And, maximum charge that can be placed on the capacitor is as follows.

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                   = 8.85 \times 10^{-12} \times 3 \times 10^{6} \times 4 \times 10^{-4}

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