Answer
given,
height of Alpe d'Huez = 1100-m
time = 37.5 min
mass of the rider and his bike = 65 Kg
the metabolic power to ride = 700 W
U = m g y
U = 65 x 9.8 x 1100
U = 700700 J
since efficiency is 25%
b)
P = 1245.68 W
Which of the following is an example of a properly written testable hypothesis? *
1 answer:
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It will take 267 milliseconds for a sample of radon-218 to decay from 99 grams to 0. 50 grams.
We know that half life of a first order reaction is given by:
where k = rate of reaction
Given half life = 35 milliseconds
So from this we get k = 0.0198
Now we know that rate of first order reaction is given by:
where t= time
R'= initial amount = 99 g
R= final amount= 0.50 g
k= rate of reaction = 0.0198
Putting values of these in above equation we get t=267 milliseconds.
i.e. It will take 267 milliseconds for a sample of radon-218 to decay from 99 grams to 0. 50 grams.
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Answer:
Explanation:
In the photoelectric effect, the energy of the incident photon is used partially to extract the photoelectron from the metal (work function) and part is given to the photoelectron as kinetic energy:
(1)
where
hf is the energy of the photon, with h being the Planck constant and f the photon frequency
is the work function of the metal
K is the kinetic energy of the electron
In this problem, the photon hasa wavelength of , so its frequency is
Now we can use eq.(1) to find the Kinetic energy of the photoelectron
And the kinetic energy of the electron is given by:
From which we can find the electron's velocity: