The work done by the brakes is
Explanation:
According to the work-energy theorem, the work done by the brakes on the car is equal to the change in kinetic energy of the car. Therefore:
where
W is the work done
m is the mass of the car
v is the final speed
u is the initial speed
For the car in this problem, we have:
m = 1500 kg
u = 20 m/s
v = 0 (the car comes to a halt)
Substituting, we find the work done:
And the work is negative because the brakes apply a force in the opposite direction to the motion of the car.
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Here object is dropped from height "h"
so we can say its initial speed is zero
and it will accelerate downwards due to gravity
now we can say it will take time T to hit the ground
now we can use
now it is given that it will take 1 second to drop h/2 height to strike the ground
so here we have can say that in "T - 1" s it will cover the h/2 distance from start
now we can say
from above two equations we have
now we can find total height of the drop by first equation
Answer:
Explanation:
vapor pressure is the pressure caused by the evaporation of liquids and is affected by the following:
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The length of copper wire this motorcyclist must use is equal to 8.56 meters.
<u>Given the following data:</u>
- Voltage of the motorcycle, V = 12 V
- Diameter of the copper wire, d = 0.25 mm
- Current in the wire, I = 4.0 A
Radius, r = diameter/2 = 0.12.5 mm = 0.000125 m.
Resistivity of the copper wire, ρ = 1.72 × 10⁻⁸ Ω-m.
<h3>How to determine the
resistance?</h3>
By applying Ohm's law, the resistance of this copper wire can be calculated by using this formula:
R = V/I
R = 12/4
Resistance, R = 3 Ohms.
Mathematically, the resistance of any conductor (wire) in terms of length is given by this formula:
Length = RA/ρ
Length = Rπr²/ρ
Length = [3 × 3.142 × (0.000125)²]/1.72 × 10⁻⁸
Length = 14.73 × 10⁻⁷/1.72 × 10⁻⁸
Length = 8.56 meters.
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