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Sauron [17]
3 years ago
11

Is the amount of friction greater between rough surfaces or smooth surfaces? Why?

Physics
1 answer:
nalin [4]3 years ago
6 0

Answer:

friction occurs because no surface is perfectly smooth.

Explanation:

rougher surfaces have more friction between them.

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A potter’s wheel moves from rest to an angular speed of 0.40 rev/s in 37.5 s.
svlad2 [7]

The angular acceleration of the potter's wheel is 0.067 rad/s².

The given parameters:

  • Final angular speed, ωf = 0.4 rev/s
  • Time of motion, t = 37.5 s

<h3>What is angular acceleration?</h3>
  • Angular acceleration of an object is the rate of change of angular speed of the object.

The angular acceleration of the potter's wheel is calculated as follows;

\alpha = \frac{\Delta \omega }{t} \\\\\alpha = (0.4\ rev/s \times \frac{2 \pi \ rad}{1 \ rev} ) \times \frac{1}{37.5 \ s} \\\\\alpha = 0.067 \ rad/s^2

Thus, the angular acceleration of the potter's wheel is 0.067 rad/s².

Learn more about angular acceleration here: brainly.com/question/25129606

5 0
2 years ago
If the line spectrum of lithium has a red line at 670.8 nm. How much energy does a a photon with this wavelength have?
Colt1911 [192]
We already know the formula for finding the energy of a photon with this wavelength as:
<span>E = ħc / λ
</span>The information's that we already know are:
h = Plancks constant
   = <span>6.626x10^-34 Js
c = light speed
   = </span><span> 2.999x10^8 m/s
</span><span>λ = Wavelength of the light as given in the question
</span>   = <span>670.8x10^-9 m
E = amount of energy
Then
E = (</span>6.626x10^-34) * (2.999x10^8)/ (<span>670.8x10^-9)
    = </span><span>2.962x10^-19 J</span>
5 0
3 years ago
What is the SI unit of measurement for mass?
Sholpan [36]

Answer:

kilogram

Explanation:

8 0
3 years ago
Read 2 more answers
A spaceship moves at a speed of 0.95 c away from the Earth. It shoots a star wars torpedo toward the Earthat a speed of 0.90 c r
wariber [46]

Answer:

0.345 c

Explanation:

v_{se} = velocity of spaceship relative to earth = 0.95 c

v_{ts} = velocity of torpedo relative to spaceship = - 0.90 c

v_{te} = velocity of torpedo relative to earth

Velocity of torpedo relative to earth is given as

v_{te}=\frac{v_{se} + v_{ts}}{1 + \frac{v_{se}v_{ts}}{c^{2}}}

v_{te}=\frac{0.95c + (- 0.90 c)}{1 + \frac{(0.95 c)(- 0.90 c))}{c^{2}}}

v_{te} = 0.345 c

5 0
3 years ago
The general consensus is that our policymakers do not know what they are doing and are managing our economy ineffectively
horsena [70]

Answer:

True.

This is because, from the information provided so far, it could be concluded that, the policy makers don't have any single idea of what they are doing regarding to the economy.

This could be seen in the series of poor performance of the economic indicators as shown which has lead to poor economic growth in our country.

Explanation:

5 0
3 years ago
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