What is the time required for sound to travel 1.75 km if the temp of the air is 20 C°?
Answer:
Explanation:
The 2 equations we need for this are
[tex]v=331.5+.606T[/tex] and
d = rt. First we need to find the velocity using the first equation, then we will plug it into the distance equation as the rate to find the time.
v = 331.5 + .606(20.0) I used 3 sig figs for the temp instead of the 1 found in 20.
v = 331.5 + 12.1 so
v = 343.6 m/s
Now, before we can find the time in seconds, we need to convert the distance to meters.
1.75 km = 1750 m:
1750 = 343.6t so
t = 5.09 seconds
What is biomass energy?
a. Energy harvested from plant material
b. Energy harvested from recycled petroleum O c. Energy harvested from synthetic oil
d. Energy harvested from wind
Answer:
A.
Explanation:
Biomass energy can be harvested from plants, wood, waste, and living or once living organisms.
~ LadyBrain
Which of the following does not use analog signals?
Am radio
VGA connected monitor
iPod
Clock with a second hand
Answer:
iPod does not use analog signals
Explanation:
Two sound waves (speed 343 m/s) have different wavelengths. The first has a wavelength of 5.72 m, and the second a wavelength of 11.44 m. What beat frequency do you hear from these two waves?
Answer:
The beat frequency is 30 Hz
Explanation:
Given;
velocity of the two sound waves, v = 343 m/s
wavelength of the first wave, λ₁ = 5.72 m
wavelength of the second wave, λ₂ = 11.44 m
The frequency of the first wave is calculated as follows;
F₁ = v/λ₁
F₁ = 343 / 5.72
F₁ = 59.97 HZ
The frequency of the second wave is calculated as follows;
F₂ = v/λ₂
F₂ = 343 / 11.44
F₂ = 29.98 Hz
The beat frequency is calculated as;
Fb = F₁ - F₂
Fb = 59.97 HZ - 29.98 Hz
Fb = 30 Hz
Processing Questions:
Directions: Answer the questions below on a clean sheet of paper.
1. How was the result of your physical fitness test in Flexibility and muscular
strength compared to your previous assessments?
2. Did you notice some improvements? If no, what do you need to do to improve
it?
Answer:
How was the result of your physical fitness test in Flexibility and muscular
strength compared to your previous assessments?
Explanation:
Match Key Nutrient with approx serving
Answer:
Use Measuring Cups?
Explanation:
A mechanical machine requires 210 J of work to do 115 J of work in lifting a crate. What is the efficiency of the machine?
Answer:
efficiency is equal to work output over work input times 100 ÷ so the answer for this question is 54.7 percent
Una placa de cobre a 20°C tiene unas dimensiones de 65cm x 78 cm. Encuentra el área de la placa a 400°C; Coeficiente de dilatación del cobre es (17x10^-6 )1/°C
Answer:
El área de la placa es aproximadamente 5102.752 centímetros cuadrados.
Explanation:
Asumamos que el cambio dimensional como consecuencia de la temperatura es pequeña, entonces podemos estimar el área de la placa de cobre en función de la temperatura mediante la siguiente aproximación:
[tex]A_{f} = w\cdot l \cdot [1 + 2\cdot \alpha\cdot (T_{f}-T_{o})][/tex] (1)
Donde:
[tex]w[/tex] - Ancho de la placa, en centímetros.
[tex]l[/tex] - Longitud de la placa, en centímetros.
[tex]\alpha[/tex] - Coeficiente de dilatación, en [tex]\frac{1}{^{\circ}C}[/tex].
[tex]T_{o}[/tex] - Temperatura inicial, en grados Celsius.
[tex]T_{f}[/tex] - Temperatura final, en grados Celsius.
Si sabemos que [tex]w = 65\,cm[/tex], [tex]l = 78\,cm[/tex], [tex]\alpha = 17\times 10^{-6}\,\frac{1}{^{\circ}C}[/tex], [tex]T_{o} = 20\,^{\circ}C[/tex] and [tex]T_{f} = 400\,^{\circ}C[/tex], entonces el área de la placa a la temperatura final:
[tex]A_{f} = (65\,cm)\cdot (78\,cm)\cdot \left[1+\left(17\times 10^{-6}\,\frac{1}{^{\circ}C} \right)\cdot (400\,^{\circ}C-20\,^{\circ}C)\right][/tex]
[tex]A_{f} = 5102.752\,cm^{2}[/tex]
El área de la placa es aproximadamente 5102.752 centímetros cuadrados.
What is mean by biodiversity???
Answer:
Biodiversity is the biological variety and variability of life on Earth. Biodiversity is a measure of variation at the genetic, species, and ecosystem level. Terrestrial biodiversity is usually greater near the equator, which is the result of the warm climate and high primary productivity.
Answer:
Bio means life
Explanation:
Biodiversity means life on earth.
[tex]what \: is \: plane \: mirror \: \: \: {?} [/tex]
>>> A plane mirror has a reflective surface that is flat (planar). The angle of reflection equals the angle of incidence for light rays striking a planar mirror. A virtual picture is a representation of an object created at the spot where light rays appear to originate.
Hope it helps
Answer:
any smooth surface which can return back the rays of light in to the same medium is called a plane mirror.
hope it helps
.
A sample of an ideal gas is contained at initial volume 34 L, temperature 450 K, and pressure 7.7 × 104 Pa. It then is allowed to expand to a volume of 40 L. To calculate the work involved in the expansion, which additional information, if any, must be known about the gas? Assume that known information includes the values of physical constants, such as the ideal-gas constant R.
A.the final pressure of the gas
B.The path of the change from initial to final conditions
C. the final temperature of the gas
Answer:
it have to be a
Explanation:
A scientist wants to learn about Earth's oceans. Which of the following
spheres should she most directly study? (2 points)
Oa
Atmosphere
Ob
Cryosphere
Oc
Geosphere
Od
Hydrosphere
The universe could be considered an isolated system because
many people think that no energy or matter exists outside the universe
energy and matter are created in the universe and flow freely into and out of the universe
energy is created outside the universe and matter is created within the universe
energy is created in the universe and matter is transferred out of the universe
Answer:
A(many people think that no energy or matter exists outside the universe)
Explanation:
En los sistemas que figuran acontinuación,indica de donde te parece que proviene la energía que usan y aclara si sólo utilizan o la que pueden acumular
Answer:
¿Qué sistemas? ¿Hubo otra parte de la pregunta que quizás hayas olvidado hacer?
Explanation:
In english:
(question) In the systems listed below, indicate where you think the energy they use comes from and clarify whether they only use or can accumulate
(answer) What systems? Was there another part of the question you might've forgotten to put?
If the mass of an object is 5 kg, the gravitational field strength is 2 and the change in height is 5 m, what is the change in gravitational potential energy stored?
Answer:
50joules
Explanation:
See the explanation from the image I have provided above.
Answer:
50j
Explanation:
the energy of a water wave is most closely related to its
Please answer as if you're teaching someone who has no knowledge of the subject, thank you.
Answer:
(C) 700 N
Explanation:
The given parameters are;
The mass of the mountain climber, m = 100 kg
The angle formed by the rope with the horizontal, θ = 45°
The gravitational field strength, g = 10 N/kg
The weight of the man, W = m × g
∴ W = 100 kg × 10 N/kg = 1,000 N
At equilibrium, we have;
The downward force, the weight of the man, W = The upward force, the vertical component of the tension on the two halves of the rope
We have;
W = T × sin(θ) + T × sin(θ)
∴ 1,000 N = 2 × T × sin(45°)
Therefore, we have;
T = 1,000 N/(2 × sin(45°)) = 707.106781 Newtons
Therefore, the tension in the rope is closest to (approximately) 700 N.
weathering can be either chemical or physical process that action of water causes physical weathering rocks which examples
Frost wedging is a type of physical weathering of rock.
Explanation:
Physical or mechanical weathering affects the rock structurally but does not change the chemical composition. Mechanical forces will rub, break or shatter the rock surfaces. Wedging, abrasion, exfoliation are different types of physical weathering.
Water is one of the main sources which alter the structure of the rocks physically.
Frost wedging occurring due to flow of freezing water over the rocks. This frozen water enters the rock through the cracks and crevices on the rock surface, and will expand inside and makes the rocks to crack further and breaks it apart.
Please mark brainliest
Plz someone help me Asap
Answer:
all I know is C
are there more questions? anyone?
-KARL IS STOOPID
Explanation:
Which are examples of a medium?
Answer:
One example of a medium is air.
Explanation:
Answer:
An example? I mean if we're going for an example, I'd say middle, Or balanced.
the energy of a water wave is most closely related to its
i believe the awnser is Amplitude
A vector has an x-component
of 19.5 m and a y-component
of 28.4 m.
Find the magnitude of the
vector.
Answer:
34.45m
Explanation:
Magnitude of a vector is equal to the square root of sum of squares of x & y vectors.
Magnitude = [tex]\sqrt({x^2} + {y^2})[/tex]
= [tex]\sqrt({19.5^2} + {28.4^2})[/tex]
=34.45m
Which of the following are steps for balancing chemical equations?
A. Add all the elements together.
B. Count the atoms in each substance in the reactants and products.
C. Subtract the total amount of elements from the products.
D. Write the chemical equation using formulas and symbols.
Discuss advantages and disadvantages of tissue culture.
Answer:
Explanation:
ADVANTAGES OF TISSUE CULTURE
There are several advantages to using the tissue culture process. We already mentioned its effectiveness in helping developing countries to increase food production, but what are some other advantages that may be relevant to you?
The new plantlets can be grown in a short amount of time.
Only a small amount of initial plant tissue is required.
The new plantlets and plants are more likely to be free of viruses and diseases.
The process is not dependant on the seasons and can be done throughout the year.
You need only a relatively small space to perform the process (ten times the plants in one-tenth of the space).
On a larger scale, the tissue culture process helps to supply the consumer market with new subspecies and variety.
People looking to cultivate challenging plants such as specific breeds of orchid find more success with the tissue culture process than traditional soil.
DISADVANTAGES OF TISSUE CULTURE
Tissue Culture can require more labor and cost more money.
There is a chance that the propagated plants will be less resilient to diseases due to the type of environment they are grown in.
It is imperative that, before being cultured, the material is screened; failure to pick up any abnormalities could lead to the new plants being infected.
While the success rate is high if the correct procedures are followed, success with the tissue culture is not a guarantee. There is still a chance that the process triggers a secondary metabolic chemical reaction, and the new explants or cells' growth gets stunted, or even die off.
13. An object, travelling along a straight path, covers 35 m distance in 4 seconds. In next 6
seconds, it covers 50 m distance. What is the average speed of the object?
(1) 3.5 m/s
(2) 4.5 m/s
(3) 7.5 m/s
(4) 8.5 m/s
Answer:
(4) 8.5 m/s
Explanation:
You add both the meters together and both the seconds together and then divide them both.
Answer:
(4) 8.5 m/s
Explanation:
Total distance = 35 + 50 = 85m
Total time = 4 + 6 = 10sec
average speed = total distance/ total time
ave. speed = 85/10 = 8.5 m/s
An electron in a hydrogen atom drops from the n= 3
energy level to the n=2 energy level. The energy of
the emitted photon is
A) 1.89 eV
C) 1.51 eV
B) 3.40 eV
D) 4.91 eV
Answer: D) 4.91 eV
Explanation:
Which of the following is true concerning hurricanes?
a. They tend to deposit more sediment than they remove.
b. Their storm surges cause widespread flooding.
c. They have fast, but generally weak wind gusts.
d. They do not alter landscapes significantly.
Answer:
B.
Explanation:
B. is correct because every time usually when a hurricane hits it causes flooding causing multiple homes to be ruined. It is a known fact that usually hurricanes start close or in along with tornadoes, the water, meaning once they hit land they have some water to flood that land with.
C. is absolutely false hurricanes have VERY strong wind gusts.
D. is absolutely wrong they do alter landscapes by ripping trees and plants and houses out of the ground making the landscapes look different.
A. is wrong they tend to deposit and remove sediment evenly.
~ LadyBrain
Answer:
B
Explanation:
A mountain climber increases their height from 200 meters to 400 meters. What affect will this have on their potential energy?
Answer:
At 400 m the potential energy of the mountain climber doubled the initial value.
Explanation:
Given;
initial height of the mountain climber = 200 m
final height of the mountain climber, = 400 m
The potential energy of the mountain climber is calculated as;
Potential energy, P.E = mgh
At 200 m, P.E₁ = mg x 200 = 200mg
At 400 m, P.E₂ = mg x 400 = 400mg
Then, at 400 m, P.E₂ = 2 x 200mg = 2 x P.E₁
Therefore, at 400 m the potential energy of the mountain climber doubled the initial value.
A potato cooks in a microwave oven. Microwaves are invisible waves that contain energy. How is heat being added to the potato?
the engery from the microwave is asorbed by the potato
The dice in a backgammon set are cubes with each side measuring 10 mm. What is the volume of these dice
Answer: 1*10^3 mm^3
That’s it
