A car with a mass of 1240kg starts from rest and accelerates to a speed of 19.4m/s in 10.2s. Assume that the force of resistance
1 answer:
Answer:
Power, P = 38459.16 W
Explanation:
Given that,
Mass of a car, m = 1240 kg
Initial speed, u = 0
Final speed, v = 19.4 m/s
Time, t = 10.2 s
The resistance force, R = 376 N
We need to find the average power developed by the car's engine. It is given by the formula as follows :
So, the required power is 38459.16 watts.
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Answer:
Parabolic motion
Explanation:
It is given that,
Speed with which a baseball is launched through the ar, v = 37 m/s
Angle of projection,
We know that when an object is projected with some initial speed having some angle of projection, the path followed by the object is called projectile motion. The object will act as a projectile here. As a result the shape of the trajectory will be parabolic.
The equation of parabolic path is given by :
It is similar to,
which is the equation of parabola
Hence, this is the required solution.
Answer:
By calculation, it can be shown that;
K =
Whereby for constant K, as increases, x also increases.
Explanation:
The experiment set up consisted of the use of a spring force to maintain the object in circular path.
The energy in the spring is given by
.
Rotational kinetic energy = ·I·ω²
Inertia, I = ·m·r²
ω =
Substituting gives
Rotational kinetic energy = ·
= ·m· v²
Equating both equations gives
K = =
Within the proportionality limit, x ∝ r
therefore we can write x = c·r which gives
=
Since = angular acceleration, α, then
m× = Angular force
Therefore K =
Therefore as Force, F increases, x also increases and the size of a spring force should be proportional to the amount of stretch in the spring.