Answer: I think layered cake.. if I’m wrong sorry
Explanation:
I guessed
Choice c it's confusing to understand but it's c
Answer:
E = p*r / 2*e_o
Explanation:
Given:
- Volume of cylinder V = pi*r^2*L
- Surface area A = 2*pi*r*L
- permittivity of space : e_o
Find:
Electric field E at distance r from the axis, where r < R.
Solution:
Step 1: Application of Gauss Law
- Form a Gaussian surface within the cylinder with r < R. Th cylinder has two surfaces i.e curved surfaces and end caps. Due to long charge distribution the flux through is zero, since the surface dA of end cap and E are at 90 degree angle to one another; hence, E . dA = E*dA*cos(90) = 0. For the curved surface we have:
(surface integral) E.dA = Q_enclosed / e_o
Step 2: The charge enclosed (Q_enclosed) is function of r and proportional density:
Q_enclosed = p*V
Q_enclosed = p*pi*r^2*L
Step 3: The area of the curved surface:
dA = 2*pi*r*L
Step 4: Compute E:
E*(2*pi*r*L) = p*pi*r^2*L / e_o
E = p*r / 2*e_o
Explanation:
Given that,
Mass of bus, m = 6110 kg
Speed of bus, v = 20 m/s
The bus will stop in 24 s gently applying the brakes, t = 24 s
The average force exerted on the bus is given by :
If the driver slams on the brakes, the stops in 3.90 s, t' = 3.9 s
The average force exerted on the bus at this time is given by :
Hence, this is the required solution.
Answer: 4.2817 × 10^14 s^-1
Explanation:
The term "wave speed" is described as the distance covered by a wave in specific time duration. The wave speed (v) can be mathematically expressed as:
v=fλ
Where;
F= frequency which is the number of waves that pass a fixed point per unit time and it is also the number of cycles or vibrations undergone during pet unit of time by a body in periodic motion
λ= wavelength which is the distance between successive crests of a wave.
Given the data,
Wavelength λ= 7×10^-7m
Speed of light c= 2.99792 × 10^8 m/s
Frequency of visible light can be given as:
Frequency= speed of light/wavelength
Frequency = (2.99792 × 10^8 m/s) / (7×10^-7m)
Frequency= 4.2817 × 10^14 s^-1
Therefore, the frequency of the light wave is 4.2817 × 10^14 s^-1