Answer:
Explanation:
When the spring is compressed by .80 m , restoring force by spring on block
= 130 x .80
= 104 N , acting away from wall
External force = 82 N , acting towards wall
Force of friction acting towards wall = μmg
= .4 x 4 x 9.8
= 15.68 N
Net force away from wall
= 104 -15.68 - 82
= 6.32 N
Acceleration
= 6.32 / 4
= 1.58 m / s²
It will be away from wall
Energy released by compressed spring = 1/2 k x²
= .5 x 130 x .8²
= 41.6 J
Energy lost in friction
= μmg x .8
= .4 x 4 x 9.8 x .8
= 12.544 J
Energy available to block
= 41.6 - 12.544 J
= 29 J
Kinetic energy of block = 29
1/2 x 4 x v² = 29
v = 3.8 m / s
This will b speed of block as soon as spring relaxes. (x = 0 )
Answer:
292.3254055 W/m²
469.26267 V/m
Explanation:
P = Power of bulb = 90 W
d = Diameter of bulb = 7 cm
r = Radius =
= Permittivity of free space =
c = Speed of light =
The intensity is given by
5% of this energy goes to the visible light so the intensity is
The visible light intensity at the surface of the bulb is 292.3254055 W/m²
Energy density of the wave is
Energy density is also given by
The amplitude of the electric field at this surface is 469.26267 V/m
Amplitude of a magnetic field is given by
The amplitude of the magnetic field at this surface is
The question should be D: Non-repeating
Answer:
<h2>135,000 J</h2>
Explanation:
The work done by an object can be found by using the formula
workdone = force × distance
From the question we have
workdone = 900 × 150
We have the final answer as
<h3>135,000 J</h3>
Hope this helps you