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30.10.2020 •
Physics
Find the magnitude of the Sun's gravitational force on the Earth when the Earth is at perihelion and at aphelion. The perihelion and aphelion distances are 1.48 ✕ 1011 m and 1.52 ✕ 1011 m, respectively.
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Ответ:
Explanation:
Force F = GMm / R²
mass of the sun M = 1.99 x 10³⁰ kg
mass of the earth = 5.97 x 10²⁴ kg
value of G = 6.67 x 10⁻¹¹
for perihelion point R = 1.48 x 10¹¹ m
Force = 6.67 x 10⁻¹¹ x 1.99 x 10³⁰ x 5.97 x 10²⁴ / ( 1.48 x 10¹¹ )²
= 36.17 x 10²¹ N
for aphelion point R = 1.52 x 10¹¹ m
Force = 6.67 x 10⁻¹¹ x 1.99 x 10³⁰ x 5.97 x 10²⁴ / ( 1.52 x 10¹¹ )²
= 34.29 x 10²¹ N
Ответ:
(A-) Number of turns in secondary coil will be less than 125.
(B-) EXPLAIN- The voltage is to be lowered. The voltage will be reduced from 120 to 9 volts. As a result, a step down transformer will be used, indicating that the secondary coil's number of turns would be less than 125.
(C-) The number of turns on the secondary coil is 12.5
Explanation:
STEP DOWN TRANSFORMER - A step-down transformer transforms high voltage (HV) and low current from the transformer's primary side to low voltage (LV) and high current on the secondary side. A phase down transformer is the opposite of this.In electrical networks and transmission lines, a step-down transformer can be used in a number of ways.
Step down transformer formula-
We are given with the -
Primary voltage = 120V
Secondary voltage
Number of primary turns
To calculate the number of turns on the secondary coil -Since , the transformer ratio is given as -
So, the number of turns on the secondary coil is -
Putting , the given values -:
= 12.5
Therefore , the number of turns on secondary coil is 12.5 .