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Effectus [21]
3 years ago
10

If a fast-moving car making a loud noise approaches and moves past the person, what will happen as the distance between the two

increases?
A. The pitch of the sound being heard by the person will appear to be higher than the pitch of the source.
B. The frequency of the sound waves reaching the person's ear will be greater than the frequency of the waves leaving the car.
C. The pitch of the sound being heard by the person will appear to be lower than the pitch of the source.
D. The pitch and frequency of the sound waves reaching the person's ear will remain unchanged.
Physics
2 answers:
densk [106]3 years ago
5 0
C.  The Pitch of the sound being heard by the person will appear to be lower than the pitch of the source.  I hope this is right

vladimir2022 [97]3 years ago
3 0
The answer is B.
The frequency will be greater


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If no friction acts on a diver during a dive, then which of the following statements is true? A) The total mechanical energy of
EleoNora [17]
If no frictional work is considered, then the energy of the system (the driver at all positions is conserved.

Let
position 1 = initial height of the diver (h₁), together with the initial velocity (v₁).
position 2 = final height of the diver (h₂) and the final velocity (v₂).

The initial PE = mgh₁ and the initial KE  = (1/2)mv₁²
where g = acceleration due to gravity,
m = mass of the diver.
Similarly, the final PE and KE are respectively mgh₂ and (1/2)mv₂².
PE in position 1 is converted into KE due to the loss in height from position 1 to position 2.
 
Therefore
(KE + PE) ₁ = (KE + PE)₂

Evaluate the given answers.
A) The total mechanical energy of the system increases.
     FALSE

B) Potential energy can be converted into kinetic energy but not vice versa.
     TRUE

C) (KE + PE)beginning = (KE + PE) end.
     TRUE

D) All of the above.
     FALSE

4 0
3 years ago
Read 2 more answers
If a semi-truck decreases its speed from 10 m/s to 5 m/s, its new kinetic energy is:
Otrada [13]
Answer is: <span>1/4 its old kinetic energy .
</span>V₁ = 10 m/s.
V₂ = 5 m/s.
m₁ = m₂ = m.
E₁ = 1/2 · m₁ ·  V₁², E₁ = 1/2 · m · (10 m/s)² = 50 · m.
E₂ = 1/2 · m₂ · V₂², E₂ = 1/2 · m · (5 m/s)² = 12,5 · m.
E₂/E₁ = 12,5m / 50m = 0,25.
V - speed of semi-truck.
m - mass of semi-truck.
E - kinetic energy of semi-truck.

5 0
3 years ago
Read 2 more answers
If two point sources of light are being imaged by this telescope, what is the maximum wavelength λ at which the two can be resol
Alex

This question is incomplete.Here is complete one

Consider a telescope with a small circular aperture of diameter 2.0 centimeters. If two point sources of light are being imaged by this telescope, what is the maximum wavelength (lambda) at which the two can be resolved if their angular separation is 3.0x10^-5 radians? Express your answer in nanometers

Answer:

λ =492nm

Explanation:

Given Data

diameter=2.0 cm

angular separation=3.0x10^-5 radians

λ=?

Solution

sin(theta) = 1.22 x λ /D

λ=(0.02×sin(3.0×10⁻⁵))/1.22

λ=492nm

6 0
3 years ago
Starting from rest at a height equal to the radius of the circular track, a block of mass 24 kg slides down a quarter circular t
LekaFEV [45]

Answer:

The work done against friction is 372 joules

Explanation:

It is given that,

Mass of block, m = 24 kg

Radius of the track, r = 15 m

Acceleration due to gravity, a=9.8\ m/s^2

If the kinetic energy of the block at the  bottom of the track is, 3900 J

Let P is the work done against friction. It is given by :

P=mgh

Here, h = r

P=24\ kg\times 9.8\ m/s^2\times 15\ m

P = 3528 J

Since it ends up with 3900 J, the work done is given by or the lost in energy will be :

W = 3900 - 3528

W = 372 joules

So, the work done against friction is 372 joules. Hence, this is the required solution.

6 0
2 years ago
Which state of matter typically has the highest density
gtnhenbr [62]

Answer:solid

Explanation:

as there is less molecular spacing, solids have more density when compared to that of liquid and gas

8 0
3 years ago
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