In which situation is the object experiencing unbalanced forces?
1 answer:
B. A car slowing as it reaches a stop light
Explanation:
According to Newton's second law, the net force exerted on an object is equal to the product between its mass and its acceleration:
where
F is the net force
m is the mass of the object
a is its acceleration
This means that when an object is experiencing unbalanced forces (), it must have a non-zero acceleration. Therefore, let's analyze the different options:
A. A box resting on a horizontal floor --> FALSE. Here the acceleration is zero, so no unbalanced forces.
B. A car slowing as it reaches a stop light --> TRUE. Since the car is slowing down, its velocity is changing, so the acceleration is non-zero and there are unbalanced forces.
C. A car with its cruise control set to 50 mph --> FALSE. Here the velocity is constant, so no acceleration and no unbalanced forces.
D. A rocket sitting on the launch pad --> FALSE. Here the rocket is stationary, so no acceleration, and no unbalanced forces.
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Answer:
B ) 1.5 m/s
Explanation:
For the apparent frequency reflected by enemy submarine , the Doppler effect formula is
F = F₀ ( V + v) / (V - v)
F anf F₀ are real and apparent frequency , V and v are velocity of sound and velocity of enemy submarine respectively.
ΔF / F₀ =
Put ΔF = 200; F₀ = 100000 and V = 1482
200 / 100000 =
v = 1.5 m s⁻¹ .