Physics Questions?

Question

1. An Airplane has a mass of 3.1 x 10^4 kg and takes off under the influence of a constant net force of 3.7 x 10^4 N. What is the net force that acts on the plane's 78 kg pilot?

2. An amusement park ride accelerates a car and it's riders from rest to 45 m/s in a time of 7.0 seconds. The mass of the car and riders is 5.5 x 10^3 kg. Find the average net force exerted on the car and riders.

3. A 15 gram bullet is fired from a rifle. It takes 2.5 x10^-3 secondsfor the bullet to travel the length of the barrel and it exits the barrel with a speed of 715 m/s. Assuming that the acceleration of the bullet is constant, find the average net force exerted on the bullet.

4. A bowling ball (mass of 7.2 kg and a radius of 11 meters) and a billiard ball ( mass of 0.38 kg and a radius of 0.028 meters) may each be treated as uniform spheres. What is the magnitude of the maximum gravitational force that each can exert on the other?

Simo · Accepted Answer

1)
F = m x a
a (of plane) = F/m
= 3.7 x 10^4 /3.1 x 10^4
= 1.1935 ms^-2

F (pilot) = m x a
= 78 x 1.1935
= 93.1 N

2) a = (V - Vo)/t
= (45 - 0)/7
= 6.4286

F = m x a
= 5.5 x 10^3 x 6.4286
= 35357.1 N

3) F = m x a
= 0.015 x (715/2.5 x 10^-3)
= 4290N

4) Not sure...

5) 5. A 35 kg crate rests on a horizontal floor and a 65kg person is standing on a crate. Determine the magnitude of the normal force that a.) the floor exerts on the crate and b.) the crate exerts on the person.

a) 35 x 9.8 = 343N

b) 65 x 65 = 637N

Ahcai · Answer

5.
a) The reaction force by floor on crate, R = (65 + 35)(10) = 1000N

b) Reaction force by crate on person, R = (65)(10) = 650 N

kinlen · Answer

Crateandb

Hannah · Answer

A force of 1.2 N is exerted on a 7.2 g rifle bullet. What is the bullet s acceleration?

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Physics Questions?

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