Answer:
can you ask clear questions I did not understand your question
Work out the area of a rectangle with base, b=20mm and perimeter, p=50mm
Answer:
100mm²
Explanation:
the other side: (50 - 20 × 2) ÷ 2 = 5
5 × 20 = 100
Answer:
Subtract given lengths: 50 - 20 = 30
Divide by 2 since there are 2 missing sides that need a length: 30 divided by 2 = 15
With the given side lengths multiply all of them to get your area.
15 x 20 = 300 is your area I am pretty sure.
13.2.2 7+6 - 9(-2)+(-3)
Answer:
34.27 is the answer
What is the quality of the sound of an ambulance's siren when it moves toward a stationary hearer? What is the quality of the sound of an ambulance's siren when it moves away from a stationary hearer?
Answer:
A) As the ambulance's siren moves toward a stationary hearer, the quality of sound will have a higher pitch
B) As the ambulance's siren moves away from a stationary hearer, the quality of sound will have a lower pitch.
Explanation:
From Doppler effect, the closer the source of sound gets to the observer, the higher the frequency and in turn the higher the pitch.
Meanwhile, the farther a source goes from an observer, the lower the frequency of the sound and also the lower the pitch.
Thus, as the ambulance's siren moves toward a stationary hearer, the quality of sound will have a higher pitch.
As the ambulance's siren moves away from a stationary hearer, the quality of sound will have a lower pitch.
Answer:
a. The quality of the sound would have a high pitch and thus be loud.
b. The quality of the sound would have a low pitch and thus would have a lower volume than the sound from the source.
Explanation:
Using the formula for Doppler shift f' = (v ± v')f/(v ± v") where v = speed of sound in air, v'= speed of hearer = 0 m/s (since he is stationary), v" = speed of ambulance and f = frequency of sound from ambulance
So, f' = (v ± v')f/(v ± v")
f' = (v ± 0)f/(v ± v")
f' = vf/(v ± v")
a. What is the quality of the sound of an ambulance's siren when it moves toward a stationary hearer?
Since the source (ambulance) moves towards the detector, (hearer), we would get an upwards shift in frequency. (Since our denominator has to be a minimum, so we use the minus sign for v"). So, the quality of the sound would have a high pitch and thus be loud.
b. What is the quality of the sound of an ambulance's siren when it moves away from a stationary hearer?
Since the source (ambulance) moves away the detector, (hearer), we would get a downward shift in frequency. (Since our denominator has to be a maximum, so we use the plus sign for v"). So, the quality of the sound would have a low pitch and thus would have a lower volume than the sound from the source.
Explain why sounds are fainter at high mountains than sea level
A closed system consists of a pendulum that is swinging back and forth. If the kinetic energy of the pendulum INCREASES, what else must happen to the energy of the system?
A. Its gravitational potential energy must decrease.
B. Its total mechanical energy must decrease.
C. Its gravitational potential energy must increase.
D. Its total mechanical energy must increase..
Answer:
Both C and D are true.
Energy goes from total kinetic to total gravitational
If Kinetic energy increases then the gravitational energy at its maximum displacement will also increase.
E (total) = PE + KE at any point of the motion
Answer: it’s A
Explanation: I just took the test
What is the amount of electrical potential is measured by?
A. ampere
B. watt
C. volts
Answer:
voltmeter (C. Volts)
Explanation:
The amount of electrical potential is measured by voltmeter. Electrical potential is the amount of work needed to move a unit electric charge from a reference point to the specific point in an electric field. The SI unit of electrical potential is Volt.
brainliest?
Answer:
Volts
Explanation:
If an object is sitting motionless on table, the normal force is...
A. Not present
B. the same forest as the force of the table pushing up on the object of interest
C. an extra force in addition to the force that the table applies to the object
Answer:
B. the same forest as the force of the table pushing up on the object of interest
can an object emit different portions of the electromagnetic spectrum at the same time?
Answer:
i don't really know but i think yes sorry if it is wrong
A person starts running from 2 m/s to 6 m/s in 2 seconds.
Calculate the person's acceleration.
Var
Variables:
Solve:
F
Formula:
Answer:
2 m/s²
Explanation:
From the question given above, the following data were obtained:
Initial velocity (u) = 2 m/s
Final velocity (v) = 6 m/s
Time (t) = 2 s
Acceleration (a) =?
The acceleration of the person can be obtained as follow:
v = u + at
6 = 2 + (a×2)
6 = 2 + 2a
Collect like terms
6 – 2 = 2a
4 = 2a
Divide both side by 2
a = 4 / 2
a = 2 m/s²
Therefore, the acceleration of the person is 2 m/s²
how can we improve natural resources
Answer:
reduce, reuse, and recycle paper,plastic, electricity, glass, fiber
A mass of 3.6 kg oscillates on a horizontal spring with a spring constant of 160 N/m. When the mass passes the equilibrium point its speed is 5.2 m/s. d. What is the maximum displacement of the mass?
Answer:
x = 0.78 m = 78 cm
Explanation:
Applying the law of conservation of energy to the spring-mass system, we can write the following equation:
[tex]Kinetic\ Energy\ at\ Mean\ Position= Potential\ Energy\ at\ extreme\ position\\\frac{1}{2}mv^2 = \frac{1}{2}kx^2\\\\x^2 = \frac{mv^2}{k}\\\\x = \sqrt{\frac{mv^2}{k} }[/tex]
where,
x = maximum displacement = ?
m = mass = 3.6 kg
v = speed at mean position = 5.2 m/s
k = spring constant = 160 N/m
Therefore,
[tex]x = \sqrt{\frac{(3.6\ kg)(5.2\ m/s)^2}{160\ N/m} }\\\\[/tex]
x = 0.78 m = 78 cm
A wave with a frequency of 20 Hz has a wavelength of 4 meters. At what speed will this wave travel?
Answer: v= 80 m/s
Explanation: speed = wavelength×Frequency
When ___ attacks the surface of a metal, it becomes tarnished.
Answer:corrosion (i believe)
Explanation:
Answer
Mix baking soda and salt with hot water and cover everything with it. The proportions are not crucial, but about 1 tablespoon of salt and 1 tablespoon of baking soda to 3 dl water should do the trick. Lightly tarnished objects should clean up in a few minutes, and you just rinse them of and dry them.
Explanation:
Select the correct answer. What step can an organization take to improve its culture? A. conduct regular development programs for employees B. employ people belonging to a certain age group only C. keep its number of employees to a minimum D. employ people with similar financial backgrounds
Answer:
A
Explanation:
you can keep all current employees and improve culture
Sound and light are both found as _____, with a variety of ____. The sun, a source of light waves specifically, releases a type of _____. It can be found as UVA or UVB types. These lights give off different levels of _____, some of wich can be harmful. The word bank is Electromagnetic energy Waves Wavelength Radiation Ultraviolet light
Answer:
Waves; wavelength; electromagnetic energy; ultraviolet light.
Explanation:
Sound are mechanical waves that are highly dependent on matter for their propagation and transmission.
Sound travels faster through solids than it does through either liquids or gases.
Light wave can be defined as an electromagnetic wave that do not require a medium of propagation for it to travel through a vacuum of space where no particles exist.
Hence, sound and light are both found as waves, with a variety of wavelength. The sun, a source of light waves specifically, releases a type of electromagnetic energy. It can be found as UVA or UVB types. These lights give off different levels of ultraviolet light, some of wich can be harmful.
Additionally, the ultraviolet spectrum is divided into three categories and these are; UVA, UVB and UVC.
Following are the response to the fill in the blanks:
Sound is a mechanical wave that is strongly dependent on material for development and conveyance. It moves faster through solids instead of through liquids or gases. The light wave is electromagnetic radiation that does not require a medium of propagation to pass through a void of space in which no particles exist. Both 'sound and light' can be found as waves having varying wavelengths. Light waves, in particular, emit a form of radiant waves, which is available in UVA and UVB varieties. The lights emit varying degrees of UV light, many of which are dangerous. In addition, the UV spectrum is classified into three categories: UVA, UVB, and UVC.Therefore, the answer is "Waves, wavelength, electromagnetic energy, ultraviolet light".
Learn more:
brainly.com/question/13695751
50 POINTS!!! PLEASE ANSWER CORRECTLY!
Who patented the first radio transmitter?
A.) Maxwell
B.) Hertz
C.) Tesla
D.) Watson-Watt
(This is so stu.pid because Marconi invented it but my science teacher doesn't uNdErStAnD that -.-)
What do oxygen and bromine have in common ?
Answer:
oxygen and bromine are both highly reactive. they are also both nonmetals
Why are fats and waxes solid at room temperature?
Answer:
Fats and waxes are solid at room temperature because they are made of saturated fatty acids. In contrast, oils are mostly unsaturated fatty acids. ... In contrast, unsaturated fatty acids have several kinks in their structure and therefore, are liquid at room temperature.
Delphina and Oribus are the same distance from the equator, and they are both near the ocean. Using the information in the map, what is likely to be true about the air temperature of the two places? Why?
The image of the map is missing, so i have attached it.
Answer:
The air temperature at oribus is warmer than the air temperature at Delphina.
Explanation:
Looking at the map, we can say that he wind will push ocean water that is turning and passing the coasts. Now, as a result, Energy will be transferred from the ocean to the air at Oribus and whereas energy is transferred from the air to the ocean at Delphina. Thus, the air temperature at Oribus will be warmer than that at Delphina.
calculate the magnitude of distance and displacement of a body moving in a complete circle
Answer:
Total distance = 2πr
Total displacement = 0
Explanation:
To Calculate the magnitude of distance and displacement of a body moving in a complete circle, we must come to these facts that:
The distance = circumference of the circle which is equal to the product of 2 ,pi and radius r
That is
Circumference = 2πr
Since velocity is changing and not constant, it is a vector quantity. Likewise displacement is a vector quantity.
The total displacement will be equal to zero.
Therefore, total distance is equal to the circumference of a circle while total displacement is equal to zero.
How will a ray of light traveling parallel to the principle axis of a concave mirror be reflected back
Answer:
It will be reflected to the principal focus of the concave mirror
Explanation:
This is because all rays parallel and close to the principal axis of a concave mirror get reflected to the principal focus of the mirror.
For a ray to be parallel to the mirror, it must be coming from an infinite distance.
So, using the mirror formula,
1/u + 1/v = 1/f where u = object distance from mirror, v =image distance form mirror and f =focal length of mirror.
Since u = infinite distance = ∞
1/u + 1/v = 1/f
1/∞ + 1/v = 1/f
0 + 1/v = 1/f
1/v = 1/f
v = f
So, the image is at the principal focus.
So, the ray of light parallel to the principal axis of the concave mirror is reflected to the principal focus of the concave mirror.
what is the order of magnitude for 3.9×10¹²
name three elements that have similar chemical properties to oxygen. (dont send me a link please)
after a meal.
6. Exercise for the diabetic should occur
a. Immediately
b. 1-3 hours
c. 5 hours
d. a day
Answer:
B.
1-3hours
Explanation:
This is because a diabetic patients have increased blood sugar or glucose concentration. After eating a meal, the blood glucose concentration will be increased as it is been accumulated . Therefore it is best diabetic patient exercise at that hour to reduce it's blood glucose concentration.
When setting your schedule, it is sometimes necessary to tell people "No." Please select the best answer from the choices provided. t or f
Answer:
True Edg2020
Explanation:
Answer: true
Explanation:
because I say so :P
A metal sphere of radius 10 cm carries a charge of 2.0 MicroCoulomb.What is the magnitude of the electric field 5.0 cm from the sphere's surface?
Answer:
E = 7200 J = 7.2 KJ
Explanation:
The electric field due to a sphere is similar to the electric field due to a point charge. It is calculated by the use of the following formula:
[tex]E = \frac{kq}{r^2}\\[/tex]
where,
E = Electric Field = ?
k = Coulomb Constant = 9 x 10⁹ Nm²/C²
q = charge on sphere = 2 μC = 2 x 10⁻⁶ C
r = distance from the center of the sphere to the location = 5 cm = 0.05 m
Therefore,
[tex]E = \frac{(9\ x\ 10^9\ Nm^2/C^2)(2\ x\ 10^{-6}\ C)}{(0.05\ m)^2}[/tex]
E = 7200 J = 7.2 KJ
what is a magnetic field? how could you visualize one?
Answer:
A magnetic field is what causes gravity basically
Explanation:
To visualize a magnetic field think of 2 ovals on the opposite side of each-other, like one oval on the top of a circle and one on the bottom, that's how id visualize it
A ball starts from rest and accelerates at a constant rate of 1.0m/s to a final velocity of
5.5m/s. How long did it take for this ball to reach its final velocity?
Answer:
Time taken to reach final velocity = 5.5 second
Explanation:
Given:
Initial velocity (Starting from rest)(u) = 0 m/s
Acceleration of ball (a) = 1 m/s²
Final velocity (v) = 5.5 m/s
Find:
Time taken to reach final velocity
Computation:
Using first equation of motion;
v = u + at
where,
v = final velocity
u = initial velocity
a = acceleration
t = time taken
5.5 = 0 + (1)(t)
5.5 = t
Time taken to reach final velocity = 5.5 second
PLEASE HELP ME :( I've tried solving it many times but my teacher keeps saying its wrong i really need help
Answer:
The charge on each end of the wire produces what we call an electric field. The electric field makes negative electrons want to travel towards the positive end of the wire (the end with not enough electrons).
the answer is d because it's going to positive.
is am alright? let me know.
Imagine that you drop a shot put from a tower on the moon. How much
will the drop time change if the shot put is dropped from a tower on the
earth that is four times as high as the tower used on the moon? The
acceleration of gravity on earth is about 6 times the acceleration due to
gravity on the moon. An equation that may be of interest is found in the
image below.
y = yo + Vyot + ayt?
Answer: y = yo + Vyot + ayt = =2ay y− yo . 5. vy. 2. −voy. 2. =−2 g y− yo
Explanation: since both the displacement and acceleration are negative, they cancel each other when divided, so the result is positive. ... As you can see, as the height displacement (height) increases, the longer it takes for the robocopter to fall.