Answer:
Friction between the box and the floor is 25N to the left
Explanation:
There are two forces acting on the box along the horizontal direction:
- The force of push applied by the worker, in the forward direction, F
- The force of friction,
, acting in the opposite direction (backward)
So the net force acting on the box is

According to Newton's second law of motion, the net force on an object is equal to the product between its mass (m) and its acceleration (a), so we can write:

And so

However, in this case the box is moving at constant speed; this means that its acceleration is zero:

Therefore we have:

Which means

And since we are told that

This means that the force of friction is also 25 N:

Answer:

Explanation:
Given data
Mass m=1.2 g=0.0012 kg
diameter d=0.76 m
Friction Force F=3.6 N
To find
Velocity v
Solution
From the Centripetal force we know that

Where m is mass
v is velocity
r is radius
Substitute the given values to find velocity v
So

Answer:
4523.17365 Pa
Explanation:
m = Mass of plane = 77000 kg
F = Force = Weight = 
g = Acceleration due to gravity = 9.81 m/s²
A = Total area of wings = 167 m²
The pressure difference would be

The pressure difference required to keep the plane aloft is 4523.17365 Pa
Answer:
Hello! It should be 3.50m/s! Hope it helps.
Explanation:
Answer:
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Explanation:
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