Answer:
D. Scientists repeat their experiments just a few times to show that they can get the same results more than once and to catch any mistakes in the procedure.
Hope this helped! :)
Answer:
76969.29 W
Explanation:
Applying,
P = F×v............. Equation 1
Where P = Power, F = force, v = velocity
But,
F = ma.......... Equation 2
Where m = mass, a = acceleration
Also,
a = (v-u)/t......... Equation 3
Given: u = 0 m/s ( from rest), v = 12.87 m/s, t = 3.47 s
Substitute these values into equation 3
a = (12.87-0)/3.47
a = 3.71 m/s²
Also Given: m = 1612 kg
Substitute into equation 2
F = 1612(3.71)
F = 5980.52 N.
Finally,
Substitute into equation 1
P = 5980.52×12.87
P = 76969.29 W
Answer:
<em>a. ratio = 40</em>
<em>b. 4 houses can be supplied</em>
Explanation:
<u>Relations in a Transformer</u>
The pole-mounted transformers are mainly used to lower higher distribution voltages to residential-level voltages. It is done by using a combination of primary and secondary coils so the relation or ratio is correctly achieved.
a. The ratio between the number of turns in the primary coil to the secondary coil is
b. This ratio also applies to the primary and secondary currents, being the secondary current r times the primary current.
The ratio between the currents is given by
We can know the secondary current
Given each house requires 40 A rms, we can supply electricity to 160/40=4 houses
Here,
Load distance (Ld) = 30 cm
Effort distance (Ed) = 60 cm
Load (L) = 200N
Effort (E) = ?
Now, By using formula,
or, E * Ed = L * Ld
or, E * 60 = 200 * 30
or, E = 6000/60
◆ E = 100N
This is a Right answer...
I hope you understand...