Answer:
0.17
Explanation:
Draw a free body diagram. There are five forces on the box:
Weight force mg pulling down
Normal force Fn pushing up
Applied force 52 N pulling to the left
Applied force 125 N pulling to the right
Friction force Fnμ pulling to the left
Sum of the forces in the y direction:
∑F = ma
Fn − mg = 0
Fn = mg
Fn = (45)(9.8)
Fn = 441
Sum of the forces in the x direction:
∑F = ma
125 − 52 − Fnμ = 0
Fnμ = 73
μ = 73 / Fn
μ = 73 / 441
μ = 0.17
For all elastic collisions we have
also by momentum conservation we will have
since two cars are identical so we know that
now by solving two equations we will have
so the correct answer must be
It attains the same speed as the first car.
Answer:
Explanation:
Firstly finding
So,
Substitute
Exchange the values of x and y
Solving for y
Adding 5 to both sides
Dividing both sides by 10
Replace
For x = -4
Answer:
2 N/m²
Explanation:
Pressure is defined as the force acting on a unit area .
Therefore;
Pressure = Force /Area
Force = 4 N
Area = 2 m²
Therefore;
Pressure = 4 N/ 2m²
= 2 N/m²
Answer:
The answer is: Pressure increases linearly with the depth
Explanation:
In this case, the definition of pressure is:
where F = mg is the weight of the fluid over the body, and A is the area of the surface to which the force is exerted. If we consider , then
.
Volume can be expressed as V = A*h, where A is the cross section of the column of the fluid over the body and h is the height of the column, in other words, the depth.
So
,
which means that pressure increases linearly with the depth in a factor of .