# Physics

posted by .

A pilot of mass 65 kg in a jet aircraft makes a complete vertical circle in mid-air. The vertical circle has a radius of 1.70 km at a constant speed of 215 m/s. Determine the force of the seat on the pilot at (a) the bottom of the loop and (b) the top of the loop. (Note that at the top of the loop, the aircraft is upside down.)
Okay, i know that first i will have to use 1700m as my radius.
Also, i know the equations i will have to work with (uniform circular motion
Centripetal Force= mass times velocity squared, all over radius.)
But, am i looking for the Fn (Normal Force) ..
and ifso,
Centripetal force will equal force of gravity plus the normal force in both situations, so how will the situations differ? like, is there something i'm missing?

• Physics -

It is very good that you have mentioned what you have already found, and what bothers you.

Basically, the centripetal force Fc=mv²/r will exert extra load on the seat. The extra load is radially outwards.

Therefore, when the pilot is at the bottom of the loop, Fc adds to gravity, which is mg. With the sign convention of positive upwards, it would be -Fc-mg.

When he is at the top of the loop, gravity is -mg (downwards), which is added to Fc. So the total force on the seat is Fc-mg (upwards).

Therefore you see that the two net forces on the seat are different when at the top and at the bottom of the loop.

## Similar Questions

1. ### ....anybody?

A jet pilot takes his aircraft in a vertical loop (Fig. 5-43). (a) If the jet is moving at a speed of 1900 km/h at the lowest point of the loop, determine the minimum radius of the circle so that the centripetal acceleration at the …
2. ### physics

a jet pilot takes his aircraft in a vertical loop. a) if the jet is moving at a speed of 2000 km/h at the lowest point of the loop, determine the minimum radius of the circle so that the centripetal acceleration at the lowest point …
3. ### Physics

A pilot of mass 65 kg in a jet aircraft makes a complete vertical circle in mid-air. The vertical circle has a radius of 1.70 km at a constant speed of 215 m/s. Determine the force of the seat on the pilot at (a) the bottom of the …
4. ### physics

A jet pilot takes his aircraft in a vertical loop.f the jet is moving at a speed of 1500 km/h at the lowest point of the loop, determine the minimum radius of the circle so that the centripetal acceleration at the lowest point does …
5. ### Physics

A fighter pilot dives his plane toward the ground at 345 m/s. He pulls out of the dive on a vertical circle. What is the minimum radius of the circle, so that the normal force exerted on the pilot by his seat never exceeds three times …
6. ### physics

the condition of apparent weightlessness for the passengers can be created for a brief instant when a plane flies over the top of a vertical circle. at a speed of 215 meters per second, what is the radius of the vertical circle that …
7. ### physics

A fighter pilot dives his plane toward the ground at 485 m/s. He pulls out of the dive on a vertical circle. What is the minimum radius of the circle, so that the normal force exerted on the pilot by his seat never exceeds three times …
8. ### Physics 6A

A jet pilot takes his aircraft in a vertical loop. If the jet is moving at a speed of 1100 at the lowest point of the loop: A)Determine the minimum radius of the circle so that the centripetal acceleration at the lowest point does …
9. ### PHYSICS 6A centripetal acceleration

A jet pilot takes his aircraft in a vertical loop. If the jet is moving at a speed of 1100km/h at the lowest point of the loop: A)Determine the minimum radius of the circle so that the centripetal acceleration at the lowest point does …
10. ### Physics

A pilot of mass m can bear a maximum apparent weight 7 times of mg.The aeroplane is moving in vertical circle.if the velocity of aeroplane is 210m/s while diving up from the lowest point of vertical circle, the minimum radius of vertical …

More Similar Questions