Answer:
The tangential acceleration of the pedal is 0.0301 m/s².
Explanation:
Given that,
Length = 19 cm
Diameter = 23 cm
Time = 10 sec
Initial angular velocity = 65 rpm
Final velocity = 90 rpm
Suppose we need to find the tangential acceleration of the pedal
We need to calculate the tangential acceleration of the pedal
Using formula of tangential acceleration
![a_{t}=\dfrac{23\times10^{-2}}{2}\times\dfrac{90\times\dfrac{2]pi}{60}-65\times\dfrac{2\pi}{60}}{10}](https://tex.z-dn.net/?f=a_%7Bt%7D%3D%5Cdfrac%7B23%5Ctimes10%5E%7B-2%7D%7D%7B2%7D%5Ctimes%5Cdfrac%7B90%5Ctimes%5Cdfrac%7B2%5Dpi%7D%7B60%7D-65%5Ctimes%5Cdfrac%7B2%5Cpi%7D%7B60%7D%7D%7B10%7D)
Hence, The tangential acceleration of the pedal is 0.0301 m/s².
Answer:
Explanation:
The refractive index of the lens is
d = 1.570 dioptres
Therefore, her focal length is
f = 1 / d
f = 1 / 1.570
f = 0.6369 m
f = 63.69cm
The distance between the newspapers and her eyes is 42cm
Distance from her eye to the glasses is 2cm
We want to calculate her near point?
So, the distance between the newspaper and the glass
do = 42 - 2 = 40cm
The distance between the glass and the virtual image formed is given as
di = f•do / (do —f)
di = 63.69 × 40 / (40 — 63.69)
di = 2547.6cm / -23.69
di = —107.54cm
The relation use is obtain from the lens equation and the negative shows that virtual image formed.
The near point from her eye is
107.54 + 2 = 109.54cm
The answer is b after I finish my test ill give you the anwsers
Answer
The force on the left across the lab table.
Explanation
The Newton's third law of motion states that; <em>action and reaction are equal but a ct in opposite direction. </em>
When the block of is pulled on the right with a force of X Newtons then there is a force -X Newtons applying and equal force on the left. For every action there must be a reaction with is equal and applying in the opposite direction.
So, if the block is pulled on the right by a force of 8 N there is another equal force applying on the left.
Answer:
B
Explanation:
for the motion every night, it is because the Earth spins on its axis.
for the changes over a year, this is because the Earth rotates around the sun.
for the changes over hundreds, thousands or millions of years, this is because the whole solar system (including the Earth, of course) rotates with all the other stars in our galaxy around the center of the galaxy. and each star system has its own orbit (similar to the planets in our solar system).
it is very rare to see objects outside of our galaxy without a telescope, but they change too over a long period of time, because our galaxy not only rotates by also moves through the universe, and these other objects move on their own too.
