A flight attendant pulls her 69.1 N flight bag
a distance of 280 m along a level airport floor
at a constant velocity. The force she exerts is
32.7 N at an angle of 50.2◦ above the horizon-
tal.
a) Find the work she does on the flight bag.
Answer in units of J.
b) Find the work done by the force of friction
on the flight bag. Answer in units of J.
c) Find the coe�cient of kinetic friction be-
tween the flight bag and the floor.
0.668 g need in order to have the same kinetic
energy as the automobile? Answer in units of
m/s.
I am sorry. I did these when I took the course in 1955. I am willing to help if you get stuck on something but I am not going to do all the problems I did in 1955 over again so that you do not have to do them.
a) To find the work done by the flight attendant on the flight bag, we can use the formula:
Work (W) = Force (F) * Displacement (d) * cos(theta)
where F is the force, d is the displacement, and theta is the angle between the force and the displacement.
In this case, the force exerted by the flight attendant is 32.7 N and the displacement is 280 m. The angle between the force and the displacement is 50.2 degrees. Plugging in these values, we get:
W = 32.7 N * 280 m * cos(50.2 degrees)
Using a calculator, we can calculate the cosine of 50.2 degrees, and then multiply it by the other values:
W = 32.7 N * 280 m * 0.641
W ≈ 5804.596 J
Therefore, the work done by the flight attendant on the flight bag is approximately 5804.596 J.
b) To find the work done by the force of friction on the flight bag, we can use the formula:
Work (W) = Force (F) * Displacement (d)
In this case, the force of friction is opposing the motion, so it acts in the opposite direction to the displacement. Therefore, the angle between the force of friction and the displacement is 180 degrees.
The force of friction can be calculated using the equation:
Force of friction = coefficient of friction * Normal force
where the normal force is the force exerted by the floor on the flight bag, which is equal to the weight of the flight bag.
Given that the flight bag is pulled along a level floor, the normal force is equal to the weight of the flight bag, which can be calculated using:
Weight = mass * gravity
The mass of the flight bag is not given, so we cannot calculate the coefficient of kinetic friction or the work done by the force of friction without this information.
c) Without the given mass of the flight bag, we cannot calculate the coefficient of kinetic friction.