List five situations in which a lesser amount of friction would be beneficial. Overall, would a high or low coefficient of frict
2 answers:
Answer:
1). between parts of machine during Relative motion
2). Rowing a boat in water
3). moving heavy mass on the surface
4). Flying of aeroplane
5). Transfer of liquid through pipe
Explanation:
As we know that friction resist the relative motion of two surface with respect to each other.
So here we require less friction in all above cases as we would like to transfer surface on another surface
Here we know that friction force is given as
so here in order to reduce the friction we need to decrease the value of coefficient of friction.
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Answer:
94.13 ft/s
Explanation:
<u>Given:</u>
= time interval in which the rock hits the opponent = 10 s - 5 s = 5 s
= distance to be moved by the rock long the horizontal = 98 yards
= displacement to be moved by the rock during the time of flight along the vertical = 0 yard
<u>Assume:</u>
= magnitude of initial velocity of the rock
= angle of the initial velocity with the horizontal.
For the motion of the rock along the vertical during the time of flight, the rock has a constant acceleration in the vertically downward direction.
Now the rock has zero acceleration along the horizontal. This means it has a constant velocity along the horizontal during the time of flight.
On dividing equation (1) by (2), we have
Now, putting this value in equation (2), we have
Hence, the initial velocity of the rock must a magnitude of 94.13 ft/s to hit the opponent exactly at 98 yards.