If a 20 kg box is accelerating upward at 8 m/s^2 , what is the magnitude of the upward force
1 answer:
Answer:
356 N
Explanation:
Newton's second law of motion describes the relationship between an object's mass and the amount of force needed to accelerate it.
here there is a weight acting downwards on the object , yet it is accelerating upwards shows that there is a net force upwards
Applying Newtons second law of motion upwards ,
Force = mass *acceleration
Upward force - m*g = m *a
F_up= 20 *8 + 20 * 9.8
= 356 N
Upward force= 160 N
You might be interested in
The average speed of the plane is 875.999 m/s.
Average speed can be defined as the ratio of total distanced travelled by the object to that of total time taken to cover the distance.
Mathematically, Average speed = Av =
According to the question,
Speed of the plane away from its base V₁ = 730 m/s
Speed of the plane when it flies back V₂ = 1095 m/s
Plane flies the distance D = 404 km
Total Distance covered by the plane S = 404 * 2 km
(because the distance travelled by the plane when going away from the base and then flying back to the base is same)
Therefore S = 808 km = 808 ˣ 10³ m
Time taken by the plane while flying away from the base T₁ =
T₁ = = 553.425 s
Time taken by the plane while flying back to the base T₂ =
T₂ = = 368.949s
Total Time T = T₁ + T₂ = 922.375 s
Therefore Av =
= m/s
= m/s
= 875.999 m/s
The average speed of the plane will be 875.999 m/s.
To know more about Average speed,
#SPJ1