Answer:
to mack boats float
Explanation:
without it the boats will sink to the bottom
Since q=mct, and q is heat ENERGY, masses and specific heat are equal, Temperature is the determining factor here. So as the equation suggests, liquid water has more energy as it contains more heat energy.
Explanation:
A diodes are semiconductors offering a low resistance in one direction which allows current to flow through and opposes the movement of current in the other direction.
Diodes allow for only a unidirectional flow and conduction of electric current.
Unlike insulators, they can conduct electric current but in one direction.
Unlike conductors, they cannot conduct in both directions.
- Most diodes are usually made of silicon and they find a wide range of application in modern electronics.
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Resistance = ρ * (L/A) and Rf = Ri * ([1 + α * (Tf – Ti)]
ρ = Resistivity L = length in meters A = cross sectional area in m^2 α = temperature coefficient of resistivity
L = 1.50 m Area = π * r^2 r = d/2 = 0.25 cm = 2.5 * 10^-3 m Area = π * (2.5 * 10^-3)^2
The cylindrical rod is similar to a resistor. Since the current is decreasing, the resistance must be increasing. This means the resistance is increasing as the temperature increases. Resistance = Voltage ÷ Current At 20˚, R = 15 ÷ 18.5 At 92˚, R = 15 ÷ 17.2
Now you know the resistance at the two temperatures. Let’s determine the resistivity at the two temperatures. Resistance = ρ * (L/A) ρ = Resistance * (A/L)
At 20˚, ρ = (15 ÷ 18.5) * [π * (2.5 * 10^-3)^2] ÷ 1.5 = At 92˚, ρ = (15 ÷ 17.2) * [π * (2.5 * 10^-3)^2] ÷ 1.5 =
Now you know the resistivity at the two temperatures. Let’s determine the temperature coefficient of resistivity for the material of the rod.
Rf = Ri * ([1 + α * (Tf – Ti)] Rf = 15 ÷ 17.2, Ri = 15 ÷ 18.5, Tf = 92˚, Ti = 20˚
15 ÷ 17.2 = 15 ÷ 18.5 * [1 + α * (92 – 20)] Multiply both sides by (18.5 ÷ 15) (18.5 ÷ 15) * (15 ÷ 17.2) = 1 + α * 72 Subtract 1 from both sides (18.5 ÷ 15) * (15 ÷ 17.2) – 1 = α * 72 Divide both sides by 72 α = 1.05 * 10^-3
You need to find speed, v.
And you (should) recognize the famous F=ma.
We've got data for F and m, so we can find a first!
a = 95N / 0.082 kg
Now from a we nees to find v. But how is v and a related?
where dv is the change in speed (some unknown v minus zero since arrow is initially at rest). dx is the distance where the arrow experiences a force (77 cm!).
Now you know values for a, dv, and dx... you can plug those in and find v!
