Answer:
Explanation:
The equation for centripetal acceleration is
Where v is the tangential velocity and r the radius of the orbit.
To calculate v we notice that the moon travels the circumference of the orbit in a time T, so we have
Putting all together:
And since the radius r is d/2, where d is the diameter of the moon's orbit, we can write the formula asked:
Answer:
K = 13448.64eV
Explanation:
(a) In order to calculate the kinetic energy of the electrons, to "see" the atom, you take into account that the wavelength of the electrons must be of the order of the resolution required (0.010nm).
Then, you first calculate, by using the Broglies' relation, the momentum of the electron associated to a wavelength of 0.010nm:
(1)
p: momentum of the electron
h: Planck's constant = 6.626*10^-34 Js
λ: wavelength = 0.010nm
You replace the values of the parameters in the equation (1):
With this values of the momentum of the electron you can calculate the kinetic energy of the electron by using the following formula:
(2)
m: mass of the electron = 9.1*10^-31 kg
In electron volts you obtain:
The kinetic energy required for the electrons must be, at least, of 13448.64 eV
Answer:
The value is
Explanation:
From the question we are told that
The speed of each train is
The speed of the bird is
The distance between the trains is
Generally the time taken before the collision occurs is mathematically represented as
=>
=>
The total distance covered by the bird is mathematically represented as
=>
=>