Use the displacement law, peak wavelength = 0.0029/T =0.0029/30000 = 97nm
Answer:
F = force
f = friction
u = coefficient of friction
R = normal reaction force
a = Acceleration
m = mass of block
g = gravity
f = uR
F = Ma
Say the block is moving to the right.
The 146N force thus acts to the right, and the friction force to the left, since it resists movement.
The 146N force acts to the right, but the horizontal component of it is 146 cos 50 = 93.84: So this is the force to the right.
Since F = uR and we're trying to find u, we need both F and R. R is easy to get since it is just m x g. This is in fact already given as the weight 350N. So R = 350.
The block is moving at a constant speed, so the force to the right must = the force to the left.
F = ma, so 93.84 - f = (350/g) x 0
This means f must be 93.84 also.
so we have f = uR,
93.84 = u x 350
so u = 0.268 or
0.27 to 2dp.
Hope you understand this.
Explanation:
Answer:
it would be 49.03325 Newton.
Answer:
3 seconds
Explanation:
Height of the building = 400 feet
Height of the ball from the ground is given by
h=400−16t²
This formula has been derived from
a = Acceleration due to gravity = 32 ft/s²
u = Initial velocity = 0
t = Time taken
Substituting all the values we get
This is the height of the ball from the top of the building
The height of the ball from the ground will be
h = 400-s
⇒h = 400−16t²
When h = 256 ft
Time taken by the ball to reach a height of 256 feet above the ground is 3 seconds
