Answer:
Wrapping the bar with a coil of wire that has an electric current.
Explanation:
To cause an iron bar to start generating a magnetic field, wrap the bar with a coil that has an electric current.
- This process is known as making magnetics using an electric current.
- There is an interaction between electric and magnetic fields.
- Electrical current can be induced by magnetic fields and magnetism can be induced by electric currents.
Wrapping the bar with a coil of wire that has electric current can cause an iron bar to start producing magnetic fields. This way, the iron bar becomes a magnet.
Answer:
a) centripetal force = m v^2 / R = 329 * (29.6 m/s)^2 / 183
F = 1580 Newtons
b) normal force = gravitational force - F = 329 * 9.8 - 1580 = 1640 N
Gravitational Potential Energy = mgh (m=mass; g=gravitational force(9.8N/kg); h = height)
Ug = (70kg)(9.8N/kg)(8m) = 5488J which is C.)
The dispersed particles of a colloid exhibit brownian motion, in which they move _____. ... The dispersed particles of a colloid exhibit brownian motion, in which they move in a chaotic manner without a discernible pattern.
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
