Answer:
0 J
Explanation:
Work is the dot product of force vector and distance vector
According to Newton's 1st law, an object subjected to no force, or net force 0, would maintain a constant speed. If the block is moving with a constant speed, then the net force (gravity, friction) must be 0. Therefore, the work that is done on the block to move at this constant speed must also be 0.
Ice wedging, pressure release, plant root growth, and abrasion can<span> all </span>break<span> apart</span>rocks<span>. ... When plants grow in cracks in a </span>rock<span>, their roots </span>can<span> widen the cracks and force the </span>rock<span> apart. Rainwater fills small cracks in a </span>rock<span>. As the </span>water<span> freezes, it expands, widening the cracks and splitting apart the </span>rock<span>.</span>
Answer:
Explanation:
Let the internal resistance be r .
Since in open circuit the volt is 1.55 V , this will be the source voltage .
Source voltage = 1.55
If external resistance be R .
1.55 / (R + r ) = .500
R + r = 3.1 ohm
So sum of internal resistance and external resistance will be 3.1 ohm.
Angular acceleration is given by
integrating both sides we will have
now if final angular speed is again ZERO
So it will be at rest after 5.23 s
Complete Question
A grating has 767 lines per centimetre.Find the angles of the first three principal maxima above the central fringe when this grating is illuminated with 672 nm light.
Answer:
The first is
The second is
The third is
Explanation:
From the question we are told that
The number of lines per cm is
The wavelength is
Generally the condition for constructive interference is
Here d is the distance of separation of the slit which is mathematically represented as
So
For the first angle n = 1
So
For the second angle n = 2
So
For the second angle n = 3
So