Answer:
Explanation:
Given:
- wavelength of light in the air,
- time taken to travel from the source to the photocell via air,
- time taken to reach the photocell via air and glass slab,
- thickness of the glass slab,
<u>Now we have the relation for time:</u>
hence,
c= speed of light in air
For the case when glass slab is inserted between the path of light:
(since light travel with the speed c only in the air)
here:
v = speed of light in the glass
Using Snell's law:
The formula that links voltage (V), resistance (R) and current intensity (I) is
Solve this formula for I to get
Plug your values for V and R and you'll get the current.
Answer:
the ratio Kf : Ki is 1 / 4 or 1 : 4
Explanation:
Given the data in the question;
Since this is a perfectly inelastic collision, momentum is conserved;
=
Now for BLOCK 1
mass = M₁ = M
KE = K
mv₁² = K
we solve for v₁
mv₁² = 2K
v₁ = √( 2K / m )
for BLOCK 2
mass = M₂ = 3m and since its at rest v₂ = 0
Now after the collision; Total mass = m + 3m = 4m
KE = K
( 4m )v² = K
(2m)v² = K
v = √(K / 2m)
so since =
[m₁ × v₁] + [m₂ × v₂] = ( m + 3m ) × v
so
[ m₁ × √( 2K / m ) ] + [ m₂ × 0 ] = ( m + 3m ) × [ √(K / 2m) ]
[ m × √( 2K / m ) ] = 4m × [ √(K / 2m) ]
square both side
m² × 2K / m = (4m)² × K / 2m
m² × 2K / m = 16m² × K / 2m
m × 2K = 8m × K
2K = 8K
K = 2K / 8
K / K = 2 / 8
K / K = 1 / 4
Therefore, the ratio Kf : Ki is 1 / 4 or 1 : 4
Answer:
Because the weight depends of the gravity
Explanation:
This is because weight and mass are different, in order to better understand this problem we will apply an example with real values, which will help us to determine a person's weight.
A man has a mass of 80 [kg] on Earth when measuring his weight he realizes that it is 784.9 [N] and on the moon it is 130.8 [N]
<u>On Earth</u>
<u />
Where:
g = gravity
<u>Weight on the moon</u>
<u />
Wm = 80 * 1.635
Wm = 130.8[N]
<u>Weight on the earth</u>
<u />
We = 80 * 9.81
We = 784.8[N]
<u />
In this way we can see that the weight depends on the gravity of where the person is located.