Answer:
a
b
Explanation:
From the question we are told that
The mass of the rock is
The length of the small object from the rock is
The length of the small object from the branch
An image representing this lever set-up is shown on the first uploaded image
Here the small object acts as a fulcrum
The force exerted by the weight of the rock is mathematically evaluated as
substituting values
So at equilibrium the sum of the moment about the fulcrum is mathematically represented as
Here is very small so
and
Hence
=>
substituting values
The mechanical advantage is mathematically evaluated as
substituting values
Answer:
K = 1.29eV
Explanation:
In order to calculate the kinetic energy of the proton you first take into account the uncertainty principle, which is given by:
(1)
Δx : uncertainty of position = 2.0pm = 2.0*10^-12m
Δp: uncertainty of momentum = ?
h: Planck's constant = 6.626*10^-34 J.s
You calculate the minimum possible value of Δp from the equation (1):
The minimum kinetic energy is calculated by using the following formula:
(2)
m: mass of the proton = 1.67*10^{-27}kg
in eV you have:
The kinetic energy of the proton is 1.29eV
Answer:
C. a ball at the top of a mountain
Explanation:
It has more potential energy because it is the highest from the ground. The higher it is, the more potential energy it has.
Explanation:
please help
I need 100$ USD Dollars for buying arduino kit the proof is in the photo.
Answer:
5.41 days
Explanation:
To find the number of days you use the decay law for radioactivity:
No: initial amount of 139np
T1/2: half-life = 2.35 days
after the decat, the final amount is 0.100% of the initial 239np, that is N=0.1No. Hence, you have:
by applying properties of logarithms you obtain:
hence, the number of days is 5.41 days