Answer: c
Explanation:
Sound waves cannot travel through a medium
Which of the following is part of the cycle of violence? (Select all that apply)
A. period of calm
B. violent episode
C. making up
D. tension-building
Which of the following technologies would produce the most energy in light
waves?
A. Infrared sensor on a DVD player
B. Wireless communications transmitter
C. Microwave industrial drying equipment
D. Compact fluorescent lightbulb
Answer:
D. Compact fluorescent lightbulb
Explanation:
Compact fluorescent lightbulb
A compact fluorescent light bulb would produce the most energy in light
waves, therefore the correct option is D.
What is electromagnetic radiation?Electromagnetic radiation is a type of energy radiation produced by the propagation of electromagnetic waves that are produced for natural as well as anthropogenic reasons. This radiation does not need any kind of medium to propagate. The electromagnetic wave has components of light as well as heat in them.
Different kinds of electromagnetic radiation have varied levels of energy for example solar radiation is also a form of electromagnetic radiation and gamma radiation is electromagnetic radiation with very high energy.
Most energy in the form of the light wave is produced by the Compact fluorescent lightbulb, therefore the correct option is D.
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A surfer paddles to where the waves are sinusoidal with crests 14 m apart. He bobs a vertical distance 3.6 m from trough to crest, which takes 1.5 s. Find the wave speed, & describe the wave.
Answer:
v = 9.34 m/s
Explanation:
Given that,
The distance between crests, [tex]\lambda=14\ m[/tex]
The vertical distance from trough to crest = 3.6 m
Time taken, t = 1.5 s
The amplitude of wave = vertical distance from trough to crest /2
= 3.6/2
= 1.8 m
The speed of the wave is given by :
[tex]v=f\times \lambda\\\\=\dfrac{\lambda}{T}\\\\=\dfrac{14}{1.5}\\\\=9.34\ m/s[/tex]
So, the speed of the wave is 9.34 m/s.
A student that just received their driver’s license decides to buy a new car. He remembers from physics class that heat engines have a thermal efficiency that can be calculated. He asks the car dealer for a car that has a high thermal efficiency rating. The car dealer says he has a car that is 100% efficient.
Which law of thermodynamics best describes why the car cannot be 100% efficient?
Answer:
Second law of thermodynamics.
Explanation:
The second law of thermodynamics states that: "in all energy exchanges, if there is no energy entering or leaving the system, then it means the potential energy of that particular state will definitely be less than the potential energy it had at it's initial state."
Now, for a car to be 100% efficient, it means that there must be some form of heat transfer to the environment. However, this is a violation of the second law of thermodynamics and as such it can't be 100% efficient.
The law that best describes why the car cannot be 100% efficient is the second law of thermodynamics.
Thermodynamics is the study of heat. Heat is a form of energy that exists as a result of temperature difference between bodies.
According to the second law of thermodynamics, the conversion of energy from one form to another is not 100% efficient. As such, the thermal efficiency of the engine can be calculated.
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A boat has a porthole window, of area 0.00849 m^2, 6.25 m below the surface. The density of sea water is 1027 kg/m^3. The air inside the boat is at 1 atm. What is the net force on the window?
Answer:
[tex]325.65\ \text{N}[/tex] outward.
Explanation:
[tex]\rho[/tex] = Density of water = [tex]1027\ \text{kg/m}^3[/tex]
g = Acceleration due to gravity = [tex]9.81\ \text{m/s}^2[/tex]
h = Height of the water = 6.25 m
A = Area of the window = [tex]0.00849\ \text{m}^2[/tex]
[tex]P_i[/tex] = Internal pressure of the boat = [tex]1\ \text{atm}=101325\ \text{Pa}[/tex]
Pressure by the water on the window
[tex]P=\rho gh\\\Rightarrow P=1027\times 9.81\times 6.25\\\Rightarrow P=62967.9375\ \text{Pa}[/tex]
Net pressure on the window
[tex]P_n=P-P_i=62967.9375-101325=-38357.0625\ \text{Pa}[/tex]
Force is given by
[tex]F=P_nA\\\Rightarrow F=-38357.0625\times 0.00849\\\Rightarrow F=-325.651460625\ \text{N}[/tex]
Net force on the window is [tex]325.65\ \text{N}[/tex] outward.
Answer: 534.6 N
Explanation:
This answer works for Acellus!
A 5kg box is being pulled for a force of 20 n and is sliding with an acceleration of 2 m/s. Find the coefficient of friction
Answer:
Coefficient of friction = 0.5
Explanation:
Given:
Mass of box = 5 kg
Force applied = 20 N
Acceleration = 2 m/s²
Find:
Coefficient of friction
Computation:
Friction force = Mass x Acceleration.
Friction force = 5 x 2
Friction force = 10 N
Coefficient of friction = Friction force / Force applied
Coefficient of friction = 10 / 20
Coefficient of friction = 0.5
I need to find the total mechanical energy. I think the first one is correct but the second one is wrong
Answer:
di ko po alam ang sagot baka
po pang grade 9 po yan
Explanation:
sana po magets nyo po
Sometimes, a crackling sound is heard while taking off a sweater during winters. Explain
Answer:
it is somewhat frozen
Explanation:
Hell it’s due soon??
Explanation:
don't know don't know don't know
Calculate the force between two objects that have masses of 70 kilograms and 2,000
kilograms separated by a distance of 1 meter.
Answer:
1. 9.338×10¯⁶ N
2. 5.28×10¯¹⁰ N
Explanation:
1. Determination of the force
Mass of 1st object (M₁) = 70 Kg
Mass of 2nd object (M₂) = 2000 Kg
Distance apart (r) = 1 m
Gravitational constant (G) = 6.67×10¯¹¹ Mm²/Kg²
F = GM₁M₂ / r²
F = 6.67×10¯¹¹ × 70 × 2000 / 1²
F = 6.67×10¯¹¹ × 70 × 2000 / 1
F = 9.338×10¯⁶ N
2. Determination of the force.
Mass of 1st fruit (M₁) = 0.45 Kg
Mass of 2nd fruit (M₂) = 0.45 Kg
Distance apart (r) = sum of their radius = 0.08 + 0.08 = 0.16 m
Gravitational constant (G) = 6.67×10¯¹¹ Mm²/Kg²
F = GM₁M₂ / r²
F = 6.67×10¯¹¹ × 0.45 × 0.45 / 0.16²
F = 6.67×10¯¹¹ × 0.45 × 0.45 / 0.0256
F = 5.28×10¯¹⁰ N
A 10 kg dog runs across the ground and jumps onto an ice-covered pond at 5 m/s. If the force of friction acting on the dog is 8 N, how far will the dog slide before coming to rest?
Answer:
15.625m
Explanation:
Using the equation of motion
v² = u²+2as
u and v are the initial and final velocities
a is the acceleration
s is the distance
Get the acceleration
According to Newton's second law;
F = ma
8 = 10a
a = 8/10
a = 0.8m/s²
We are also given
v = 5m/s
u = 0m/s
Substitute into the formula above
v² = u²+2as
5² = 0²+2(0.8)s
25 = 1.6s
s = 25/1.6
s = 15.625m
Hence the dog will cover a distance of 15.625m before coming to rest
Fill in the blanks:
1. When a spring is pulled, the _____ is proportional to the ______ ( called ____ law.
2.Weight is the force of ____ on an object due to the pull of the _____
3. Weights and other forces are measured in ______
4. Here on Earth, the pull of gravity on a mass of 1 kg is ______ Newtons
5. Weight is measured by a _____ balance and _______ from place to place
6. Newton's first law says: every mass stays at _______ or moves at constant _______ in a _______ line unless a resultant _______ acts on it
7. To move in a _______ orbit, an object must have a _______ force on it
Answer:
st8tif7u
Explanation:
t996w4sia74a85e8srz
Complete the sentences to describe the difference between speed and velocity.
Speed describes how fast an object moves. Speed is described by
with
Velocity is described by
Tand time
and time. Velocity is speed
Answer:
velocity =displacement/time
and speed =distance/time
Answer:
a) Distance
b) Direction
c) Displacement
Explanation:
jus did it on edeg
A portable speaker is switched on. 600 J of energy is transferred from the chemical
store in the battery to the thermal store of surroundings; 250 J by heating and
some by radiation (sound). How much energy is transferred by radiation?
Answer:
350 J of energy is transferred by radiation.
Explanation:
Given that,
600 J of energy is transferred from the chemical store in the battery to the thermal store of surroundings.
Heat energy = 250 J
Sound energy = x
According to the conservation of energy,
600 = 250 +x
x = 600-250
x = 350 J
So, 350 J of energy is transferred by radiation.
A student passed a current of 0.6 A through copper sulfate solution for 300 s
Calculate the charge flow through the solution.
Please any one help me
Answer:
Which one are we supposed to do
Explanation:
please fast if you solve this you will get 20 point
define monsoon.....?
Answer:
A monsoon is traditionally a seasonal reversing wind accompanied by corresponding changes in precipitation but is now used to describe seasonal changes in atmospheric circulation and precipitation associated with the asymmetric heating of land and sea
Explanation:
A: How far did she travel?
B: How long did she take?
can someone help me please
Answer:
distance and time
Explanation:
like miles per hour, its the measure of how far something went durind a span of time, hours.
what is a work done on a body moving in a circular path
What might happen if the earth didn't have an atmosphere?
A Everything would go flying off into space.
B.
We wouldn't be able to breathe.
С
The earth's rotation would stop.
D
The seasons would be longer.
If the earth didn't have an atmosphere, we wouldn't be able to breathe. So, option B.
The atmosphere serves as a blanket, maintaining Earth's normal temperature. All of the gases required to support life on Earth are present in it. The ozone layer in the atmosphere shields the Earth from dangerous UV radiation.
Infrared radiation from the earth is reflected back to the surface by the lowest layers of the atmosphere. The atmosphere effectively traps the thermal radiation that the planet receives from the sun throughout the day.
The surface of the world would become too cold to support life if the atmosphere weren't present.
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Which does energy never do?
it never grows
it never disappears
it never lessens
it never changes
PLZZ answer With THE CHOICES PROVIDED THANKS!!!!
23. Give two examples of where dissipation occurs.
-solar energy into electrical energy inside solar panels
-during photosynthesis, solar energy is converted into chemical energy
Which vector has an x-component with a length of 3?
А. С.
B. d
C. a
D. b
Answer:
B.d
mark me as brainlist
Answer:
D. b
Explanation:
the endpoint of vector b is at 3, which means the length is 3
Laura puts her file cabinet on a small cart with wheels which will occur. A Laura will increase the amount of friction. B Laura will reduce the force she needs C Laura will decrease the amount of motion D Laura will increases the force she needs
Answer: b
Explanation:
Laura will increase the force she needs. When Laura puts her file cabinet on a small cart with wheels, the cart will experience less friction compared to the file cabinet directly resting on the ground. The correct answer is option D.
The presence of wheels reduces the contact area between the cart and the ground, leading to lower frictional forces. As a result, it becomes easier for the cart to move. However, the file cabinet still possesses its original mass, so to accelerate the cart (and the cabinet) to a certain speed or maintain a constant velocity, Laura will need to exert a greater force on the cart due to the reduction in friction. Therefore, the correct answer is D - Laura will increase the force she needs.
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Not affected by acids a physical or chemical?
How do you calculate the magnitude of a force?
A solution contained 0.05g of sodium hydroxide in 25 cm3 of water
What is the concentration of the solution in g/dm3?
Given :
A solution contained 0.05g of sodium hydroxide in 25 cm3 of water.
To Find :
The concentration of the solution in g/dm³.
Solution :
We know, 1 cm = 0.1 dm
So, 1 cm³ = 0.001 dm³
Now, 25 cm³ = 25 × 0.001 dm³
25 cm³ = 0.025 dm³
Now, concentration of the solution in g/dm³ is [tex]\dfrac{0.05\ g}{0.025\ dm^3} = 2 \ g/dm^3[/tex].
Therefore, the concentration of the solution is 2 g/dm³.
Who thinks this a ufo? The following images are from a rare footage.
Answer:
That might be a sled ngl but it looks like a ufo but it's definitely not
Answer:
the reptilians gave there tech to the nazis and the reptilians are currently living underground in Antarctica but id'k about that pic
Explanation: