What is the value of the normal force if the coefficient of kinetic friction is 0.22 and the kinetic frictional force is 40 newt
ons?
2 answers:
Answer:
181.82N
Explanation:
We have the following:
Coefficient of kinetic friction:
Kinetic frictional force:
and we have a formula that relates these two quantities:
where is the normal force. So since the normal force is what we are asked for, we clear for N in the last equation:
and substituting all the known values:
The normal force has a value of 181.82N
You might be interested in
Answer:
Light of a shorter wavelength should be used.
Explanation:
This is studied in the phenomenon called photoelectric effect, in which light is able to release electrons from a metal, said electrons are called photoelectrons .
The experiments that have been carried out show that <u>increasing or decreasing the intensity of the light will not cause the photoelectrons to be emitted</u>, what will cause the photoelectrons to be emitted is to increase the frequency of the incident light.
And a higher frequency corresponds to a shorter wavelength according to the equation:
(where is frequency,
the speed of light, and
the wavelength)
So the answer is that the wavelength of the light must be shortened to cause the emission of electrones.
The velocity of the parachutist after 4 seconds is 40 m/s (downward)
Explanation:
Before his parachute opens, the man is in free fall, so we can calculate its velocity at time t using the suvat equation:
v = u + at
where
v is the velocity at time t
u is the initial velocity
is the acceleration of gravity (taking downward as positive direction)
Assuming he jumps from rest,
u = 0
So, its velocity after t = 4 s is
And the direction is downward, since the result is positive.
Learn more about free fall:
#LearnwithBrainly