Answer:
74.55Hp
Explanation:
Hello! To solve this problem we must do the following 3 steps.
1. Find the ideal power using the equation to find the power W = mgV
W=mgV
where
M=mass of elevator=1700kg
g=gravity=9.81m/S^2
V=speed=3m/S
W=(1700kg)(9.81m/S^2)(3m/s)=50031W
2.
Now as the problem indicates that 10% of energy is lost in the mechanical system, we divide the power found in the previous step by 90%
3.
finally we convert units from W to hp.
the minimum output power rating in HP of the motor that meets the requirement is 74.55Hp
Answer:
6.3 C
Explanation:
From the question,
Energy lost by the capacitor(half it stored energy) = 1/4CV².......................... Equation 1
Where C = Capacitance of the capacitor, V = Volatge across the parallel plate of the capacitor.
E = 1/4CV²
Given: C = 2.1 F, V = 6.0 V
Substitute these values into equation 1
E = 1/4(2.1)(6²)
E = 18.9 J
But,
E = 1/2QV..................... Equation 2
Where Q = amount of charge lost
Make Q the subject of the equation
Q = 2E/V................. Equation 3
Give: E = 18.9 J, V = 6.0 V
Q = 2(18.9)/6
Q = 6.3 C.
Answer: the momentum is increased
Energy and momentum are conserved, this was proved by he American physicist Arthur H. Compton after his experiments related to the scattering of photons from electrons (Compton Effect), in which he also proved that photons do have momentum.
So, this momentum is given by the following expression:
Where is the Planck constant and is the wavelength of the photon.
As we can see, the momentum is inversely proportional to to the wavelength. This means, if <u>decreases</u>, <u>increases</u>.
Answer:
so birds have better tempatures
Explanation:
when a bird gets to cold in ny or somting it migrates over to floridia to become warmer because it does not snow in floridia