A novice scuba diver practicing in a swimming pool takes enough air from his tank to fully expand his lungs before abandoning th
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Answer:
The true statement is:
"(C) The magnitude of the average velocity is equal to 30 m.p.h."
Explanation:
Given that a car travels 30 miles in 1 hour on a winding mountain road.
Let' check all the statements one by one:
(A) The magnitude of the total displacement is larger than the distance traveled.
Since the entire motion of the car is not exactly given in the question, so it is not possible to tell whether the magnitude of the total displacement is larger than the distance traveled or not.
Thus, this statement is not true.
(B) The magnitude of the average velocity is greater than 30 m.p.h.
The average velocity of an object is defined as the total displacement covered by the particle divided by the total time taken in covering that displacement.
Total distance covered by the car = 30 miles.
Total time taken by the car to cover this distance = 1 hour.
Therefore, the average velocity of the car for this time interval =
Thus, this statement is also not true.
(C) The magnitude of the average velocity is equal to 30 m.p.h.
As is cleared in part (B) section above, the average velocity of the car in the given time interval is 30 m.p.h.
Thus, this statement is true.
(D)The magnitude of the average velocity is less than to 30 m.p.h.
Since. the average velocity of the car is 30 m.p.h.
Thus, this statement is not true.
(E)The car traveled with a constant speed of 30 m.p.h.
The motion of the car on the mountain road is not thoroughly given in the question, so again it is not possible to tell whether the car traveled with a constant speed of 30 m.p.h. or not.
Thus, this statement is also not true.
The static friction exerted on the block by the incline is .
The given parameters;
- <em>mass of the block, = M</em>
- <em>coefficient of static friction in section 1, = </em>
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- <em>angle of inclination of the plane, = θ</em>
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The normal force on the block is calculated as follows;
Fₙ = Mgcosθ
The static friction exerted on the block by the incline is calculated as follows;
Thus, the static friction exerted on the block by the incline is
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