Many counties in Florida missed many school days in the fall of 2004 due to hurricanes that year. A solution for how to make up
1 answer:
Answer:
108 extended days
Explanation:
Regular school hours a day = 6 hr
No. of school days to make up by extending the regular hours = 3 days
Amount of time added to the regular hours of school = 10 min
No. of extended school days to make up the 3 school days by following the above mentioned criteria be x.
Time of school hours in 3 days =
are required to make up 3 days of school having 6 hours of regular timing with 10 minutes of add-on time each day.
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Given that force is applied at an angle of 30 degree below the horizontal
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now the friction force on the cart is given as
now if cart moves with constant speed then net force on cart must be zero
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so the force must be 199.2 N
Answer:
v = 12.1 m/s
Explanation:
- When at the top of the circle, there are two forces acting on the combined mass of the rider and the motorcycle.
- These are the force of gravity (downward) and the normal force, which is directed from the surface away from it, perpendicular to the surface.
- In this case, as the motorcycle runs in the interior of the circle, at the top point this force is completely vertical, and is also downward.
- Since the motorcycle is moving in a vertical circle, there must be a force, keeping the object moving around a circle.
- This force is the centripetal force, aims towards the center of the circle, and is just the net force aiming in this direction at any point.
- At the top point, this force is just the sum of the normal force and the weight of the mass of the rider and the motorcycle combined, as follows (we take the direction towards the center as positive):
- Now, we know that the centripetal force is related with the tangential speed at this point and the radius of the circle as follows:
- Since the normal force takes any value as needed to make (1) equal to (2), if the speed diminishes, it will be needed less force to keep the equality valid.
- In the limit, when the motorcyvle tires barely touch the surface, this normal force becomes zero.
- In this condition, from (1) and (2), we can find the minimum possible value of the speed that still keeps the motorcycle touching the surface, as follows: