Answer:
8.77×10⁻⁵ m
Explanation:
ω = angular velocity = 3.49 rad/s = 33 rpm
r = Radius of the groove = 0.1 m
f = Frequency = 3.98 kHz
Tangential Velocity of record
v = ωr
⇒v = 3.49×0.1
⇒v = 0.349 m/s
The velocity of the wave is 0.349 m/s
v = fλ
∴ Wavelength in the groove is 8.77×10⁻⁵ m
Answer:
E = 1000 x
Explanation:
The electric potential and the electric field are related by the formula
dV = - E . dx
Bold represents vectors.
The point represents the scalar product, in this case we calculate the electric field in the x-axis and the potential is also in this axis so the scalar product is reduced to the algebraic product
E = dV /dx
Let's make the derivative
E = - 2ax
Let's replace the values
E = -2 (-500) x
E = 1000 x
-- The kinetic energy it has when it hits the ground is exactly
the potential energy it had just before you dropped it.
-- So if you want it to have twice as much kinetic energy at the bottom,
you want it to have twice as much potential energy at the top.
-- Potential energy = (mass)·(gravity)·(height).
The only one of those things that you can change is the height.
Looking at that equation, you can see that if you change the height,
the potential energy changes by the same factor.
So if you want the pebble to have twice as much potential energy,
you have to drop it from twice the original height. (2h)
Explanation:
You can simply subtract the atomic number from the mass number in order to find the number of neutrons. If the atom is neutral, the number of electrons will be equal to the number of protons.
Remember!
1. Your mass number is the total number of neutrons and protons within the atom.
2. Your atomic number is the amount of protons within the atom.
3. For neutral atoms, the electron number is the same as the atomic number.
Answer:
N=mg
g=10-3=7
n=40×7
n=280
Explanation:
please make me brainiest if it helps you