Answer: The tidal forces exerted by the moon are directly associated with the earth's rotation. Due to the strong gravitational pull of the moon, the tidal bulging appears on both the sides on earth and these are region of high tide, and there is gradual rise and fall of sea level.
Because of these tidal effect, the earth is able to rotate only once in each of the orbital period.
Frictional force and Applied force has same “magnitude” and “opposite” direction.
Option: B
<u>Explanation</u>:
When a book is moved horizontally by applying “force” on the book, the frictional force is opposed to the book by the table. Here, this “frictional force” is opposing the book has the same force what we applied on the book but this frictional force and the applied force are opposite in direction. Always the “frictional force” is opposite to the “applied force” which stops the object to move. For example, if a force applied leftward to the object the frictional force is acted on the right side of the object.
When two objects are in contact they experience a "frictional force". This "frictional force" acts opposite to the force applied on to move the object.
Formula for "frictional force" is 
Where, 
is coefficient of friction and N is normal force.
Answer:
Explanation:
The same current flows through each part of a series circuit. The total resistance of a series circuit is equal to the sum of individual resistances. Voltage applied to a series circuit is equal to the sum of the individual voltage drops.
I = 0.33 A
= 330 mA
Capacity, P = I × t
= 2050/330
= 6.21 hours
Time, t = 6.21 hours.
The difference in the power required by the motor at start up and at operating speed is 9778.57
<h3>What is power? </h3>
This is defined as the rate in which energy is consumed. Electrical power is expressed mathematically as:
Power (P) = voltage (V) × current (I)
P = IV
Power = square voltage (V²) / resistance ®
P = V² / R
<h3>How to determine the power by the EMF</h3>
- Voltage (V) = 37 V
- Resistance (R) = 0.14 Ω
- Power by EMF (P₁) =?
P = V² / R
P₁ = 62² / 0.14
P₁ = 27457.14 watts
<h3>How to determine the power by the back EMF</h3>
- Voltage (V) = 62 V
- Resistance (R) = 0.14 Ω
- Power by back EMF (P₂) =?
P = V² / R
P₂ = 37² / 0.14
P₂ = 9778.57 watts
<h3>How to determine the power difference</h3>
- Power by EMF (P₁) = 27457.14 watts
- Power by back EMF (P₂) = 9778.57 watts
- Difference in power =?
Difference = P₁ - P₂
Difference in power = 27457.14 - 9778.57
Difference in power = 17678.57 watts
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