Chang sees the following formula on a website about Newton’s second law. a = Sigma F over m.
2 answers:
Answer:
He needs to find the net force acting on the object in a direction.
Explanation:
The second law of motion gives the relationship between force, acceleration and mass of an object. Its mathematical expression is given by :
F represents the net force acting on the object. So, Chang needs needs to find the net force acting on the object in a direction. Hence, the correct option is (a).
You might be interested in
Answer:
Explanation:
Given:
- mass of the object on a horizontal surface,
- coefficient of static friction,
- coefficient of kinetic friction,
- horizontal force on the object,
<u>Now the value of limiting frictional force offered by the contact surface tending to have a relative motion under the effect of force:</u>
where:
normal force of reaction acting on the body= weight of the body
As we know that the frictional force acting on the body is always in the opposite direction:
So, the frictional force will not be at its maximum and will be equal in magnitude to the applied external force and hence the body will not move.
so, the frictional force will be:
The average power is 20.3 kW
Explanation:
First of all, we calculate the work done on the car: the work-energy theorem states that the work done on the car is equal to the change in kinetic energy of the car, so we have
where
W is the work done
are the initial and final kinetic energy of the car
is the mass of the car
u = 0 is the initial velocity
v = 18.0 m/s is the final velocity
Substituting,
Now we can find the average power developed by the car's engine, which is given by
where
is the work done
t = 12.0 s is the time taken
Substituting,
Learn more about power:
#LearnwithBrainly