Answer:
What are Newton's laws of motion? Newton's laws of motion relate an object's motion to the forces acting on it. In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration.
why alloys
are useful to someone with no science
knowledge
Will give Brainiest
Answer:
The key idea behind the synthesis, processing and application of alloys consist in combining desire qualities from each mineral component in the form of a material.
Explanation:
The key idea behind the synthesis, processing and application of alloys consist in combining desire qualities from each mineral component in the form of a material. For example, steel is the combination of iron, which is ductile but prone to rusting in wet environments, and carbon, which offers high hardness and additional resistence to rusting in wet environments, but is fragile. Hence, steel is more resistant to rusting, ductile as iron and more resistant than iron.
A lift motor transfers 24 000J of energy in 1 minute travelling between floors. Calculate the power of the motor.
Answer:
400W
Solution :
power (w) = work done (J) ÷ time(s)
x= 24000J ÷ 60s = 400W
Dave runs a 400 m race with a speed of 4 m/s. What time will it take him to finish the
race?
Answer:
The answer should be 100 if not try 200
Explanation:
d=v x t
400m=4m/s x t
/4 /4
100=t
What do scientists hope to find? Why would that sort of thing be found inside Earth?
Answer:
Scientists will hope to find a lot of things. Such as lava, fossils, and landmarks.
Explanation:
i farted
20points, ill give brainliest. Its important pls
The moon orbits the Earth at 384,400,000 meters. Earth has a mass of 6x1024kg. How fast does the moon orbit the earth?
A 2 kg rock is at the edge of a cliff 20 meters above a lake The rock becomes loose and falls toward the water below. Calculate its potential and kenetic energy when its at the top and when its halfway down. Its speed is14 m/s at the halfway point
Answer:
The potential energy (P.E) at the top is 392 J
The kinetic energy (K.E) at the top is 0 J
The potential energy (P.E) at the halfway point is 196 J.
The kinetic energy (K.E) at the halfway point is 196 J.
Explanation:
Given;
mass of the rock, m = 2 kg
height of the cliff, h = 20 m
speed of the rock at the halfway point, v = 14 m/s
The potential energy (P.E) and kinetic energy (K.E) when its at the top;
P.E = mgh
P.E = (2)(9.8)(20)
P.E= 392 J
K.E = ¹/₂mv²
where;
v is velocity of the rock at the top of the cliff = 0
K.E = ¹/₂(2)(0)²
K.E = 0
The potential energy (P.E) and kinetic energy (K.E) at the halfway point;
P.E = mg(¹/₂h)
P.E = (2)(9.8)(¹/₂ x 20)
P.E = 196 J
K.E = ¹/₂mv²
where;
v is velocity of the rock at the halfway point = 14 m/s
K.E = ¹/₂(2)(14)²
K.E = 196 J.
The potential energy (P.E) at the top is 392 J
The kinetic energy (K.E) at the top is 0 J
The potential energy (P.E) at the halfway point is 196 J.
The kinetic energy (K.E) at the halfway point is 196 J.
Calculation of the potential energy and kinetic energy:
Since
mass of the rock, m = 2 kg
height of the cliff, h = 20 m
speed of the rock at the halfway point, v = 14 m/s
We know that
P.E = mgh
P.E = (2)(9.8)(20)
P.E= 392 J
Now
K.E = ¹/₂mv²
here.
v is velocity of the rock = 0
K.E = ¹/₂(2)(0)²
K.E = 0
Now
The potential energy (P.E) and kinetic energy (K.E) at the halfway point;
P.E = mg(¹/₂h)
P.E = (2)(9.8)(¹/₂ x 20)
P.E = 196 J
K.E = ¹/₂mv²
Here,
v is the velocity of the rock= 14 m/s
K.E = ¹/₂(2)(14)²
K.E = 196 J.
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Energy Transformation Crossword
I need someone to do number 1, I can’t figure it out.
How is social media changing the world as we know it?
Answer:
Social media has helped many businesses grow and promote itself, and has helped people find a better way to connect and communicate with one another. On the other hand, it's also provided many people with problems involving mental health, emotional insecurities, and waste of time
Explanation:
what they said is correct
What is the power of a motor that transfers 450 J of energy in 9s?
Answer:
50
Explanation:
power= work/time
450J/9s
50J/s
Is this statement true or false?
A full moon occurs approximately three weeks after a new moon.
It would really help me if you would say why the answer is either true or false!
I think that it is true, but I'm not exactly sure. :)
Which two statements describe how ultrasound technology produces an image of a baby before it is born?
A. An image is created based on the frequency of reflected X-rays.
B. Body tissues absorb high-frequency sound waves, producing an image.
C. An image is created based on the amount of time it takes for a sound wave to return.
D. Tissues in the baby's body reflect high-frequency sound waves.
Answer:
C,D
Explanation:
an image is created based on the amont of time it takes for a sound wave to return
Tissues in the babys body reflect high-frequency sound waves
In ultrasound scanning, an image of internal organs is created based on the amount of time it takes for a sound wave to return.Thus, option C is correct.
What is ultrasound scanning?High-frequency sound waves are used in ultrasound imaging, also known as sonography, to view within the body. Real-time ultrasound imaging allows for the display of blood flowing via blood vessels as well as movement of the body's internal organs.
Contrary to X-ray imaging, ultrasonic imaging does not expose patients to ionizing radiation.A transducer (probe) is positioned either on the skin or inside a bodily orifice during an ultrasonic examination.
To allow the ultrasonic waves from the transducer to pass through the gel and into the body, a small coating of gel is placed to the skin.
To find more on ultrasound scanning, refer here:
https://brainly.com/question/29439731
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Why do the north and south poles of these magnets attract each other? A. The magnetic fields of the two magnets repel each other.
O O O
B. They have two different magnetic fields.
C. The opposite magnetic poles of the two magnets face each other.
D. They have opposite electrical charges.
Answer:
D makes the most sense to me.
The force causes the car to move at a constant speed of 3 m/s. What will happen if the force is changed to 35 N?
The question is incomplete, the complete question is;
A car is moving at a constant speed of 3 m/s when a force of 25N is acting on it. What will happen if the force is changed to 35N?
The car will move at a constant speed of 13 m/s
The speed of the car will not change.
The speed of the car will increase.
The speed of the car will decrease to 1 m/s
Answer:
The speed of the car will increase.
Explanation:
When a the force acting on an object moving at constant velocity is changed, its velocity changes accordingly.
The question said that the car was moving at a constant velocity of 3m/s when a 25 N force is applied, then the car must move faster than 3 m/s when a 35 N force is applied since the 35N force is greater than the 25 N force.
Hence the answer above.
which planets are in the habitable zone?
planets
Explanation:
kelper-174dkelper-443 bFlies 876 c16 Cygnus BbA car covers 100 km in 2 h , what is the speed of the car.
A cart with mass m rolls along a track to the right with a speed vo. It strikes a bumper and rebounds with speed of vo/2. a) Use the impulse-momentum to write an equation for the
system which is the cart only. b) If the time during which the bumper exerts a force on the cart is t, write an expression for the force F exerted on the cart in terms of the given variables.
Answer:
a. I = -3mv₀/2 b. F = -3mv₀/2t
Explanation:
a. Use the impulse-momentum to write an equation for the system which is the cart only.
We know Impulse , I = Δp where Δp = change in momentum.
Now, Δp = m(v - u) where m = mass of cart, u = initial velocity of cart = v₀ and v = rebound velocity of cart = -v₀/2 (negative since it moves in the opposite direction to u)
So, I = Δp = m(v - u)
Substituting the values of the variables into the equation, we have
I = m(-v₀/2 - v₀) = -3mv₀/2
So, I = -3mv₀/2
b. If the time during which the bumper exerts a force on the cart is t, write an expression for the force F exerted on the cart in terms of the given variables.
We know impulse I = Ft where F = force exerted on the cart and t = time force acts
Also, I = -3mv₀/2
So, Ft = -3mv₀/2
F = -3mv₀/2t
I NEED HELP ASAP IM ON TIMER !!!!!!!!
Average speed and average velocity are always the same.
Please select the best answer from the choices provided
T
F
Average speed and average velocity are always the same.
Please select the best answer from the choices provided
T
F
Answer:
F
Explanation:
The average velocity is the ratio of total displacement and time.The average speed is the ratio of total distance and time.Therefore the average speed and average velocity are equal if the total displacement is equal to the total distance that is if the body travels along a straight line without changing the direction.
I need help plzzzzz!!
Explanation:
can u tell me which language is that
a person brings his face close to a mirror . h e finds that the image of his face is magnified write the name of the mirror used with reason
Answer:
Spherical concave mirrors
Explanation:
Like spherical convex mirrors, spherical concave mirrors have a focus. If the object is closer to the mirror than the focal point is, the image will be virtual, like we talked about before for the plane mirror and the convex mirror.
Concave mirrors, on the other hand, can have real images. If the object is further away from the mirror than the focal point, the image will be upside-down and real---meaning that the image appears on the same side of the mirror as the object.
The closer the object comes to the focal point (without passing it), the bigger the image will be.
You can try this yourself by looking into the concave side of a shiny spoon. If you look into the spoon while holding it at arm’s length, you’ll see an extremely magnified, upside-down image of your face. But as you bring the spoon closer to your eyes, the image will get bigger and bigger.
- Hope this helps! <3
Whailt's magnification
?
Answer:
Magnification is the degree to which an object is multiplyed to get it's image.
For example if an object size is 10cm an it's image size is 20cm then the magnification is 2, that is the image is twice the size of the object.
Hope that helps
PLZ HELP
The muscle that is directly in front of the Tircep is called what:
a
Bicep
b
Quad
c
Obliques
Question 2 (50 points)
The reason the muscle is called the Tricep, is that it contains three different muscles.
True
False
The temperature is directly proportional to the speed of sound. Why?
First, we need to understand what we mean by sound and temperature. Sound is the vibration of particles traveling as a wave. Temperature is a measure of energy in a system of particles. A higher temperature means the particles have a higher energy, higher energy means they're moving around faster, and that faster motion makes them more capable of carrying sound waves.
Robins are birds that sing to attract mates two male robins robin A and Robin B are both singing to attract females robin A had more songs which the females find more attractive which option is likely to happen
Answer:
The female birds find more attractive which option is likely to happen is discussed below in detail.
Explanation:
All About Robins and How to Attract Them - Natural Birds Unlimited | Wild Birds Unlimited. These birds are interested to inaugurate grasslands and gardens with seasoned underbrush and trees. While they consume a variety of pests and grains or seeds, it has been remarked that they can consume up to 5 meters of earthworms in a day.
Which describes how electromagnetic waves travel?
Answer:
Travels through solid materials, and air.... but it can also travel through the vacuum of space
Explanation:
You drive 10 meters backwards and then 20 more meters backwards in 30 seconds. What is your average velocity?
Answer:
Average velocity= 1 m/s
Explanation:
Step one:
given data
total distance covered = 10 meters backwards+ 20 more meters backwards
toatal distance= 10+20= 30 meters
time taken = 20 seconds
Required
The average velocity
Step two:
the expression for the average velocity is
Average velocity= total distance/total time taken
Average velocity= 30/30
Average velocity= 1 m/s
Ocean waves are hitting a beach at a rate of 3.2 Hz. What is the period of the waves? (2 decimal places)
Answer:
0.31s
Explanation:
Given parameters:
Frequency of the ocean waves = 3.2Hz
Unknown:
Period of the waves = ?
Solution:
The period of a wave is the inverse of the frequency of a wave;
Period = [tex]\frac{1}{Frequency}[/tex]
Now insert the parameters and solve;
Period = [tex]\frac{1}{3.2}[/tex] = 0.31s
The period of the wave is 0.31 s.
The question above can be solved using the relationship between period and frequency (T = 1/F).
Frequency: This can be defined as the number of complete oscillations performed by a wave in one second.
Period: This is the time required by a wave to complete one oscillation.
The relationship between period and frequency
Formula:
T = 1/F....................... Equation 1
Where:
T = Period of the waveF = Frequency of the waveFrom the question,
Given:
F = 3.2 HzSubstitute this value into equation 1
T = 1/3.2T = 0.3125 sT = 0.31 sHence, the period of the wave is 0.31 s.
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The surface area of a postage
stamp is 0.00600 m^2, and the air exerts 1.00 atm of pressure on it. How much force does it exert on the stamp?
Answer:
608
Explanation:
Trust me
Answer:
608
Explanation:
I only answer after making sure the answer is correct and I get the green tick, not the red cross (Acellus)
What kind of physical quantity is force?
a. Force is a scalar quantity.
b. Force is a vector quantity.
c. Force is both a vector quantity and a scalar quantity.
d. Force is neither a vector nor a scalar quantity.
4 A magnet can exert a force of attraction or a force of repulsion on another magnet.
Which of these forces is a push and which is a pull?
please explain too thanks!
Answer:
Push -repulsion
Pull - attraction
Explanation:
When two magnets are brought together, a push happens when a force of repulsion is experienced where the magnets move away from each other. This means their polarity is the same and this will cause the magnet to push away from each other.
When two magnets are brought together , a pull happens when a force of attraction is experienced where the magnets move close to each other. This means their polarity is different and thus causes the magnets to pull closer to each other.
Name the force between the brakes and the wheels that does work to slow down the vehicle when the brakes are applied.
Answer:
Friction
Explanation:
Because the brake pad is rubbing alongside the wheel to slow the body of the car down