Answer:
6 second
Explanation:
initial velocity of ball, u = 60 m/s
g = 10 m/s^2
Let the ball takes time t to reach at the maximum height
We know that at maximum height, the velocity of ball is zero.
v = 0 m/s
Use first equation of motion
v = u + gt
0 = 60 - 10 x t
t = 6 second
Thus, the ball takes 6 second to reach to maximum height.
Answer:
387 volts
Explanation:
Ohm's law is used to relate voltage, current and resistance.
The formula is as follows:V = I * R
where:
V is the applied voltage (measured in volts)
I is the current flowing (measured in amperes)
R is the resistance (measured in ohm)
In the given, we have:
current (I) = 9 amperes
resistance (R) = 43 ohm
Substitute with the givens in the above formula to get the voltage as follows:
V = 9 * 43
V = 387 volts
Hope this helps :)
Answer:
B. 2.3 x 10⁶
Explanation:
To calculate scientific notation for the number 2,300,000, we have to follow this notation
<u>Step 1 :</u>
To find a we have to write the non-zero digits placing a decimal after the first non-zero digit.
<u>Step 2 :</u>
Now, to find b count how many numbers of digits are there to the right of the decimal.
Hence, there are 6 digits to the right of the decimal.
<u>Step 3 :</u>
Since, we had found the value of a and b, we can now reconstruct the number into scientific notation.
a = 2.3
b = 6
<u>Therefore</u><u>,</u><u> </u><u>option </u><u>b </u><u>is </u><u>correct</u><u>.</u>
Answer:
N₂ / N₁ = 13.3
Explanation:
A transformer is a system that induces a voltage in the secondary due to the variation of voltage in the primary, the ratio of voltages is determined by the expression
ΔV₂ = N₂ /N₁ ΔV₁
where ΔV₂ and ΔV₁ are the voltage in the secondary and primary respectively and N is the number of windings on each side.
In this case, they indicate that the primary voltage is 9.0 V and the secondary voltage is 120 V
therefore we calculate the winding ratio
ΔV₂ /ΔV₁ = N₂ / N₁
N₂ / N₁ = 120/9
N₂ / N₁ = 13.3
s good clarify that in transformers the voltage must be alternating (AC)
