1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Katena32 [7]
4 years ago
7

A truck is traveling 70.0 kph away from you. The driver is blowing the horn, which has a frequency of 400 Hz. The air temperatur

e is 25ÁC. What is the observed frequency of the horn?
Physics
1 answer:
mr_godi [17]4 years ago
4 0
There are several information's already given in the question. Based on those information's the answer can be easily deduced.
Speed of the truck = 70 kph
                              = 19.44 m/s
Speed of sound = 343 m/s
Then
Observed frequency = 400 Hz ∗ 343 m/s/<span>19.44m/s + 343 m/<span>s
                                 = 378.54
                                 = 379 Hz</span></span>
You might be interested in
It usually takes more force to start an object sliding than it does to keep an object sliding because static friction is usually
labwork [276]
The answer is already in the blank for, its was greater
5 0
4 years ago
Which statements describe projectile motion? Check all that apply.
miv72 [106K]

In projectile motion we can say initial components of velocity is

v_x = v_0 cos\theta

v_y = v_0 sin\theta

now here horizontal motion is uniform motion as there is no force in this direction while in vertical direction due to gravity it will accelerate

so we have

x = v_0 cos\theta * t

y = v_0 sin\theta * t - \frac{1}{2}gt^2

so here we have x and y coordinates are related to each other as it will take same time to move the positions

so here correct options are

<em>Projectile motion is a combination of horizontal and vertical motion. </em>

<em>The horizontal and vertical motions of a projectile are dependent on each other.</em>

5 0
3 years ago
Read 2 more answers
During a lab investigation, students added four 50 g masses to two boxes and arranged the boxes so that they were motionless on
IceJOKER [234]

When the resultant force is not equal to zero termed an unbalanced force. By procedures 4 and 5 students observe an unbalanced upward force on Box 1. Hence option 1 is right for the problem.

<h3>What is an unbalanced force?</h3>

The forces operating on a body are known as unbalanced forces when the resulting force exerted on it is not equal to zero.

Unbalanced forces acting on the body, causing it to modify its state of motion. To further grasp the nature of imbalanced forces.

<h3 />

The following reasons by which we can understand the unbalanced force caused by the box.

Due to these two reasons, books will move up.

By adding another mass to box 2. The box becomes lighter. As the box becomes lighter the gravity force acting on the box will be less due to which the box easily can move up.

By removing the two masses from box 1. Due to which other become heavier other becomes heavier pulling it down causing box 1 one to go up.

Hence by procedures 4 and 5 students observe an unbalanced upward force on Box 1. Hence option 1 is right for the problem.

To learn more about the unbalanced force refer to the link;

brainly.com/question/227461

3 0
3 years ago
How physical properties are important for identifying unknown substances
dmitriy555 [2]

Answer:

Every characteristic property is unique to one given substance. Scientists use characteristic properties to identify an unknown substance. Characteristic properties are used because the sample size and the shape of the substance does not matter.

Explanation:

A characteristic property is a chemical or physical property that helps identify and classify substances. The characteristic properties of a substance are always the same whether the sample being observed is large or small. Examples of characteristic properties include freezing/melting point, boiling/condensing point, density, viscosity and solubility.

6 0
4 years ago
Ch 14:42
Alisiya [41]

Answer:

1000m3

Explanation:

12000=mass*gravity, considerinh gravity 10

12000=mass*10 then mass=1200Kg

With density 1.2Kg/m3

1.2Kg ... 1m3

1200Kg ... 1000m3

End

4 0
3 years ago
Other questions:
  • Which of these statements is true?
    11·2 answers
  • How much work does the electric field do in moving a proton from a point with a potential of +175 v to a point where it is -55 v
    8·1 answer
  • Without the wheels, a bicycle frame has a mass of 8.29 kg. Each of the wheels can be roughly modeled as a uniform solid disk wit
    13·1 answer
  • A gasoline engine transform approximately 34 percent of the fuel's chemical energy into mechanical energy. if energy is conserve
    15·1 answer
  • Jack tries to place magnets on his refrigerator at home, but they won’t stick. What could be the reason?
    13·1 answer
  • 12. One object has half the mass of another object. The first object also has half the ---.
    7·1 answer
  • Most soda has a lot of sugar and no nutritional benefit. True or False ​
    7·2 answers
  • Which has a greater momentum: a ship weighing kg that is tied to a dock or a raindrop weighing kg that is falling from a cloud?
    12·1 answer
  • The circuit below shows a silicon based transistor incorporated with a potential decider circuit to control the transistor. Dete
    7·1 answer
  • A(n) __________ __________ is made with an electromagnet that is free to spin between two permanent magnets
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!