g PRACTICE ANOTHER Two trains approach each other on separate but adjacent tracks. Train 1 is traveling at a speed of 30.3 m/s a
1 answer:
Answer:
f'= 607.8 Hz
Explanation:
This is a Doppler effect exercise due to the relative velocity of the sound source and the observer.
By the time the source and the observer are getting closer the expression is
f ’=
where vs is the speed of the source, vo is the speed of the observer, if the bodies move away the signs are exchanged
in this case, train 1 emits sound, so its speed is v_s = 30.3 m / s and train 2 is the receiver of the sound v₀ = 22.5 m / s
let's calculate
f ’= 520 (343+ 22.5 / 343 - 30.3)
f'= 607.8 Hz
You might be interested in
The conservation of energy and Newton's second law allows us to find the results about Jason's falling motion are;
- The energy when reaching the water is K = 13720 J
- The average force of the water to stop it is: F = 2744 N
The conservation of energy is one of the most important principles of physics, stable that if there is no friction force, mechanical energy is conserved at all points.
Mechanical energy is the sum of kinetic energy plus potential energy.
Let's look for the energy at two points
Starting point. Get higher.
Em₀ = U = 13720 J
Final point. Lower down.
= K
Friction in the air is negligible, so energy is conserved.
K = 13720J
<h3>Kinematics and Newton's law.</h3><h3> </h3>
They indicate that it stops 5m under the water, if we assume that the water acts with a constant force, we can use kinematics and Newton's second law to find this force.
The kinematics expression to find the acceleration is
v² =v₀² – 2ay
When it stops the speed is zero.
Newton's second law is:
F = ma
F = m ( )
The expression for the kinetic energy is:
K = ½ m v₀²
Let's substitute.
F =
Let's calculate.
F=
F = 2744N
In conclusion using conservation of energy and Newton's second law we can find the results about Jason's falling motion are;
- The energy when reaching the water is K = 13720 J
- The average force of the water to stop it is: F = 2744 N
Learn more about energy here: brainly.com/question/14274074
Answer:
doubles
Explanation:
The relationship between angular speed and linear speed in case of a circular motion is the following:
where
v is the linear speed
is the angular speed
r is the distance from the centre of the circular path
In this proble, the pet hamster moves to a point twice as far from the center; this means that its distance from the centre, r', is doubled:
While the angular speed remains the same. Therefore, the new linear speed is
So, the correct answer is
the linear speed doubles