PHYSICS HIGH SCHOOL

As you move toward a warning siren, the pitch _____.increases
decreases
stays the same
disappears

Answers

Answer 1
Answer:

Answer: Increases.

Explanation:

Warning siren is generally used to make people alert of danger. Danger can be anything associated with the health and hazard.

Warning siren can be due to tsunami, earthquake, fire, flood, et cetera. The pitch of siren is low when a person is afar from the siren.

As the person moves close to the siren, the pitch of siren increases.
Answer 2
Answer:

Answer:

As you move toward the siren the pitch should get louder

Explanation:

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A car with a mass of 1800 kilograms is traveling at a speed of 29 m/s on a horizontal flat road. Calculate the radius of its path. Which formula must be used to solve this?

Answers

Answer:

Explanation:

r = v^2 / g

where:

r is the radius of the path (in meters)

v is the speed of the car (in meters per second)

g is the acceleration due to gravity (in meters per second squared)

In this case, v = 29 m/s and g = 9.81 m/s^2. Therefore, the radius of the car's path is:

r = 29^2 / 9.81 = 82.5 meters

So the answer is 82.5

I need help ASAP.The average time that it takes for the car to travel the first 0.25m is_____

The average time to travel just between 0.25m and 0.50m is_____

Given the time taken to travel the second 0.25m section, the velocity would be____m/s

Answers

1. Average time for the first 0.25 m: 2.23 s

Explanation:

The average time that it takes for the car to travel the first 0.25 m is given by the average of the first three measures, so:

t=(2.24s+2.21s+2.23s)/(3)=2.227 s=2.23 s

2. Average time to travel between 0.25 m and 0.50 m: 0.90 s

Explanation:

First of all, we need to calculate the time the car takes to travel between 0.25 m and 0.50 m for each trial:

t1 = 3.16 s - 2.24 s = 0.92 s

t2 = 3.08 s - 2.21 s = 0.87 s

t3 = 3.15 s - 2.23 s =  0.92 s

So, the average time is

t=(0.92 s + 0.87 s + 0.92 s)/(3)=0.903 s=0.90 s

3. Velocity in the second 0.25 m section: 0.28 m/s

Explanation:

The average velocity in the second 0.25 m section is equal to the ratio between the distance covered (0.25 m) and the average time taken (0.90 s):

v=(d)/(t)=(0.25 m)/(0.90 s)=0.28 m/s

Answer:

1. 2.23

2. 0.90

3. 0.28

What is the correct formula for work?a. Work = force / time
b. Work = force * distance
c. Work = force / distance
d. Work = mass * acceleration

Answers

The correct formulafor work is option B. Work = force * distance.

What is Work and what is its formula?

  • In physics, the term "work" has a specific meaning.
  • Work, in physics, occurs when a force acts on an object to move it some distance from the start point (also called displacement).
  • Work is calculated as the force times the distance.
  • In other words, work is equivalent to the application of a force over a distance.
  • The amount of work a force does is directly proportional to how far that force moves an object.
  • The work formula is w  = F × d.
  • F is the force, d is the distance, and w is the work.

To know more about work, refer to: https://brainly.in/question/18131759

#SPJ2

Answer:

The answer is B.

Explanation:

The formula for work is force times distance.

The first thing to focus on when creating a workout plan isdetermining the frequency of the activity
choosing the intensity level
watching others complete the activity
selecting an activity you enjoy

Answers

I think the best answer is option one. The first thing to focus on when creating a workout plan is determining the frequency of the activity. It is important took look at how much time do you have to do things in order to manage your tasks daily and you can give enough time for each activity.
Key points you need remember while doing workout are:

1. Frequency
2. Intensity
3. Time
4. Type.

As you may expect, this refers to however typically you may exercise. Once any sort of exercise is performed your body completes a method of reconstruction and repairing. So, decisive the frequency of exercise is vital so as to search out a balance that has simply enough stress for the body to adapt and conjointly permits enough rest time for healing.
Therefore, the first thing to focus on when creating a workout plan is determining the frequency of the activity. It is important to take a look at how much time do you have to do things in order to manage your tasks daily and you can give enough time for each activity.

Hardness is indirectly related to: specific gravity surface roughness strength of chemical bonds weight

Answers

The strength of chemical bonds would be the best answer to this question. Hardness is indirectly related to the strength of chemical bonds. Hardness is the resistance from the destruction of an object itself from a material. Hardness does not need to strength of chemical bonds in order to have this resistance.
Hardness is indirectly related to: strength of chemical bonds.

A truck on a straight road starts from rest, accelerating at 2.00 m/s2 until it reaches a speed of 20.0 m/s. Then the truck travels for 20.0 s at constant speed until the brakes are applied, stopping the truck in a uniform manner in an additional 5.00 s. (a) How long is the truck in motion? (b) What is the average velocity of the truck for the motion described?

Answers

You can use the equation
V_xf = V_xi + a_x(t)

V_xf = 20.0m/s
V_xi = 0m/s
ax = 2.0t

Thus, solve for t and get 10secondsand then take 5 seconds to break after 20 seconds of drivingso for

a) 10 + 20 + 5 = 35 seconds

for part b)
You can use the formula
Delta x/Delta t = average velocity
 
Need to find xf, knowing xi = 0

Thus, use the formula
 x_f = x_i + V_xi(t) + (1/2)a_x(t)^(2)
x_f = 0 + 0(10) + (1/2)(2.0)(10)^(2)
 x_f = 100m
 
so for the first 10 seconds the truck traveled 100msAt a speed of 20m/s

20m/s = xm/20s20*20 = x
x = 400
 
thus we have 100+400 = 500mthen it slows down from 500m to x_f
 
thus I use the equation
x_f = x_i + (1/2)(V_xf + V_xi)t
x_f = 500 + (1/2)(0 + 20)(5)x_f = 500 + 50
x_f = 550
 
therefore the total distance traveled is 550m

to calculate average velocity
550/35 = 16m/s

thusV_xavg = 16m/s
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