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3 years ago

WILL MARK BRAINLY

Physics

2 answers:

const2013 [10]3 years ago

6 0

Answer:

They accelerate.

Explanation:

whether an object is ar rest or in motion, when external, unbalanced forces act on it, the object accelerates, as stated in Newton's second law:

$F=ma$

where F is the net force acting on the object, m is its mass, and a its acceleration. Therefore, if there are unbalanced forces acting on the object, the object will accelerate. This means that an object at rest will start moving (in the direction of the net force), while an object already in motion will increase (or decrease, depending on the direction of the force) its velocity.

pochemuha3 years ago

6 0

Answer:

uy45jxyrjdf

Explanation:

vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvdddddddddddddd

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3 years ago

A police car chases a speeder along a straight road towards a cliff both vehicles move at 160km/h the siren on the police car pr

natta225 [31]

Answer:

f ’= 97.0 Hz

Explanation:

This is an exercise of the doppler effect use the frequency change due to the relative movement of the fort and the observer

in this case the source is the police cases that go to vs = 160 km / h

and the observer is vo = 120 km / h

the relationship of the doppler effect is

f ’= f₀ (v + v₀ / v- $v_{s}$ )

let's reduce the magnitude to the SI system

v_{s} = 160 km / h (1000 m / 1km) (1h / 3600s) = 44.44 m / s

v₀ = 120 km / h (1000m / 1km) (1h / 3600s) = 33.33 m / s

we substitute in the equation of the Doppler effect

f ‘= 100 (330+ 33.33 / 330-44.44)

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