Answer:
1 / 2
Explanation:
This problem is a 1 - D steady state heat conduction with only one independent variable (x).
1 - D steady state:
Q = dT / Rc
Q = heat flow
dT = change in temperature between a pair of node
Rc = thermal resistance
Rc = L / k*A
Since in both cases Rod A and Rod B have identical boundary conditions:
dT_a = dT_b
So,
R_a = L / k*(pi*r^2)
R_b = 2L / k*(pi*(2r)^2) = L / k*(2*pi*r^2)
Compute Q_a and Q_b:
Q_a = k * dT *(pi * r^2 * / L)
Q_a = k * dT*(2*pi * r^2 * / L)
Ratio of Q_a to Q_b
Q_a / Q_b = [k * dT *(pi * r^2 * / L)] / [k * dT*(2*pi * r^2 * / L)] = 1 / 2
The vast majority of antimatter in the early universe must have been annihilated with matter.
<h3>What is antimatter?</h3>
Antimatter is a material made up of subatomic particles with the mass, electric charge, and magnetic moment of electrons, protons, and neutrons in regular matter but with the opposite signs for these three properties. Positron (e+), antiproton (p), and antineutron (n) are the names of the antimatter particles that correspond to electrons, protons, and neutrons, respectively. These particles are collectively referred to as antiparticles. The positron has a positive charge, the antiproton has a negative charge, and the antineutron, though electrically neutral, has a magnetic moment with the sign opposite that of the neutron because the electrical properties of antimatter are the reverse of those of regular matter.
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Answer:
D. Equalize voltage
Explanation:
Of the following lead-acid battery the battery with voltage value is Equalize voltage. EQUALIZING lead acid battery is process of de-sulphating the battery by carrying out a controlled overcharge. When battery plates acquire sulphate coating over time, their efficiency reduces, by overcharging this sulpahte coating is blown-off and the battery is rejuvenated.
Answer: The truck has a greater kinetic energy
Explanation:
The initial velocities of both the truck and car are the same. Likewise, the final velocity is the same. The change in kinetic energy is dependent only on mass. The truck has a greater mass, therefore, the change in its kinetic energy is greater.
