Answer:
5.22 Ns
Explanation:
A consequence of Newton's second law of motion is that:
Impulse = change in momentum
The initial momentum = (0.145 kg) × (15.0 m/s)
The final momentum = (0.145 kg) × (-21.0 m/s)
The final momentum has a negative sign because the ball returned in an opposite direction.
Change in momentum = final momentum - initial momentum = (0.145 kg) × (-21.0 m/s) - (0.145 kg) × (15.0 m/s)
= -0.145(21.0 + 15.0) kg m/s
= -0.145 × 36.0 kg m/s
= -5.22 kg m/s
The magnitude of the impulse is thus 5.22 Ns.
Good morning!
Wind energy is closer to the energy provided by the Tides as both are governed by forces of nature. In addition, the two are considered renewable energy sources and generate kinetic energy. These kind of energy are often used in Brazil.
Hugs!
The net charge of the asteroid is
with a negative sign since it is a net negative charge.
The charge of one electron is
In order to find what is the excess of electrons on the asteroid, we must simply divide the net charge in excess on the asteroid by the charge of a single electron, and we find:
Answer:0.502kg
Explanation:
F4om the relation
Power x time = mass x latent heat of vapourization
P.t=ML
1260 * 15 *60 = M * 22.6 * 10^5
M= 1134000/(22.6 *10^5)
M=0.502kg=502g
Answer:
A) μ = A.m²
B) z = 0.46m
Explanation:
A) Magnetic dipole moment of a coil is given by; μ = NIA
Where;
N is number of turns of coil
I is current in wire
A is area
We are given
N = 300 turns; I = 4A ; d =5cm = 0.05m
Area = πd²/4 = π(0.05)²/4 = 0.001963
So,
μ = 300 x 4 x 0.001963 = 2.36 A.m².
B) The magnetic field at a distance z along the coils perpendicular central axis is parallel to the axis and is given by;
B = (μ_o•μ)/(2π•z³)
Let's make z the subject ;
z = [(μ_o•μ)/(2π•B)] ^(⅓)
Where u_o is vacuum permiability with a value of 4π x 10^(-7) H
Also, B = 5 mT = 5 x 10^(-6) T
Thus,
z = [ (4π x 10^(-7)•2.36)/(2π•5 x 10^(-6))]^(⅓)
Solving this gives; z = 0.46m =