Answer:
19.6 m/s
Explanation:
The parameters given are:
Mass M = 20 Kg
Force F = 285 N
Angle Ø = 30 degree
Time t = 4 seconds
Coefficient of friction = 0.72
At the plane, the weight of the box will be mgsinØ
Resolving forces at the plane, we will have:
MgsinØ + Fr = F
Where Fr = frictional force.
Fr = F - mgsinØ
Substitute all the parameters into the formula
Fr = 285 - 20 × 9.8 sin30
Fr = 285 - 98
Fr = 187 N
But for the box moving toward the top of the plane,
F - Fr = ma
Where a = V/t
Substitute all the parameters involved into the formula
285 - 187 = 20 ( V/4)
98 = 5V
V = 98/5
V = 19.6 m/s
Therefore, the speed with which the box is moving is 19.6 m/s
Increasing a car's speed from 0 mph to 30 mph requires more work than that of 50 mph to 60 mph.
<h3>What is work?</h3>
Work is a measure of energy expended in moving an object. It is calculated by multiplying the force by the distance.
According to this question, work is required to move a car from one position to another.
The distance moved from 0 - 30mph is more than that moved from 50 - 60mph, therefore, increasing a car's speed from 0 mph to 30 mph requires more work than that of 50 mph to 60 mph.
Learn more about work at: brainly.com/question/19382352
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Answer:
The measure of angle B equals the measure of angle C.
Explanation:
When a ray of light falls on a smooth polished surface and the light ray bounces back, it is called the reflection of light.
There are two laws of reflection;
1) The incident ray and reflected ray and normal all lie in the same plane.
2) The angle of incidence is equal to angle of reflection.
Here angle of incidence is represented by B and angle of reflection is by C.
So according to law of reflection the measure of angle B equals the measure of angle C.
Answer:
i mean its asking what your favorite sport is..
Explanation:
