Answer:
Radius of the track is 3376.40 n
Explanation:
We have given speed v = 75.75 km/hr = 
Mass is given m = 92 kg
Centripetal force is given F = 12.8 N
We have to find the radius of the curve
Centripetal force is equal to 
So 
r = 3376.40 m
So radius of the circular track is 3376.40 m as the SI unit is m so it will be 3376.40 m
The direction of the vector with respect to the x-axis
is the angle whose tangent is (4/5) .
Arctan(4/5) = 38.7° counterclockwise from the x-axis.
Answer: Option A
Explanation:
Acceleration is defined as the rate of change of the vellocity.
Then, if the acceleration is equal zero, the object has a constant velocity or a velocity equal to zero (also constant, of course)
Then, te correct option would be option A; resting, because an object resting has instantaneuos acceleration of zero.
The correct answer that would best complete the given statement above would be the second option. A screw is an inclined plane wrapped around a cylinder. <span>The efficiency of a screw is low because there is more input than output. In other words, it is because of friction. Hope this answer helps.</span>