Answer:
I think kilogram.
Explanation:
If you refer to science book you can find.
calculate the efficiency of a light bulb that had an input of 400 j transfers 100j as a light and 300j as heat.
The SI unit of refractive index is ___
a)km/s. b)m/s. c)sec. d)no unit
Answer:
d)no unit
Explanation:
refractive index is a unit less quantity.
Light waves are:
O Mechanical Waves
o Electromagnetic Waves
electromagnetic
all electromagnetic waves move at the speed of light.
so yes, light waves are electromagnetic waves :)
i hope this 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
A car covers 100 km in 2 h , what is the speed of the car.
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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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.
Carly has discovered a new radioactive isotope: unicornium-210. Based on atomic mass alone, into which of the following elements could 210Ui not decay?
A. 238U
B. 90Sr
C. 115Eu
D. 151Sm
Answer:
A
Explanation:
The element that unicornium-210 (210Ui) could not decay into based on atomic mass alone is 90Sr.
What is radioactive isotope?A radioactive isotope is a type of atom that has an unstable nucleus that spontaneously decays or disintegrates, emitting radiation in the form of particles or electromagnetic waves. This process is known as radioactive decay.
The unstable nature of the nucleus arises from having too many or too few neutrons compared to the number of protons in the atom, which affects the stability of the atomic nucleus. The decay of radioactive isotopes can have practical applications in fields such as nuclear medicine, energy production, and environmental monitoring, but can also pose health and safety risks if not handled properly.
Learn more about radioactive isotope, here;
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what else is produced when sodium carbonate decomposes
Answer:
The chemical symbol for sodium carbonate is . The decomposition of sodium carbonate is: The decomposition of sodium bicarbonate, will result in the formation of sodium oxide, and carbon dioxide, . Hence, carbon dioxide, will produce with sodium oxide, on decomposition of
Hope this will help you
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.
The force of gravity between two objects follows an----- square law with regard to the distance between them what word completes the sentence
Answer:
Inverse
Explanation:
The force of gravity between two objects follows an inverse square law with regard to the distance between them.
The inverse square law refers to any law that stipulates that a particular quantity varies inversely to the square of the distance to its source and according to the law of universal gravitation, the gravitational force of attraction between two objects is inversely proportional to the square of the distance separating the two objects.
Hence, the law of universal gravitation obeys the inverse square law.
Explain why an object floats on water. Use terms like buoyancy force and gravitational
force.
Answer:
If an object pushes out an amount of water equal to its own weight, the upward force acting on it will be equal to gravity - and the object will float.
Explanation:
The buoyant force has an impact on the object in the water and equals the weight of the water displaced by the object. Every object placed in water has some buoyancy force that pushes it against the gravitational force, and this means that any object loses weight in the water.
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
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
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
The coach has not seen improvement as expected in his team and plans to change practice session. To help the players he changes the Frequency, Intensity, Time and Type of their exercise and uses the fitness principle of frequency
overload
progression
reversibility
Answer:
progession
Explanation:
Energy Transformation Crossword
I need someone to do number 1, I can’t figure it out.
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.
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.
1 Newton = 1 ___?
A) kg*m/s
B)kg/m
C)m/s^2
D)kg*m/s^2
Answer:
D) kg*m/s^2
Explanation:
One newton is the force needed to accelerate one kilogram of mass at the rate of one metre per second squared in the direction of the applied force.
A car covers 100 km in 2 h , what is the speed of the car. {I want full answer}
Answer:
52.8 km/h.Explanation:
The average speed of the car is 52.8 km/h.A car covers a distance of 100 km in first two hours and 32 km in next half an hour. Average speed is equal to total distance divided by total time taken. It is given by : So, the average speed of the car is 52.8 km/h.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.
715 J of heat are transferred from
a 1.30 kg aluminum block to a
0.800 kg iron block. Find the
temperature change for the
aluminum
Aluminum
Iron or steel
c = 900 J/(kg*c)
c = 452 J/(kg"C)
(Unit = degrees C)
Answer:0.61
Explanation:
the answer is 0.61 because i just typed it into acellus abs it was right
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)
PLEASE PLEASE HELP ME ILL GIVE U BRAINLIEST JUST FILL IN THE BLANKS
Answer:
38 kg.m/s
Explanation:
Momentum
Momentum is often defined as "mass in motion".
Since all objects have mass, if it's moving, then it has momentum. The momentum is a vector and It can be calculated as the product of the mass by the velocity of the object:
[tex]\vec p = m\vec v[/tex]
If only magnitudes are considered:
p = mv
We are given that an m=9.5 kg turkey is running at v=4 m/s. Below is the formatted data:
p = ?
m = 9.5 kg
v = 4 m/s
Formula
p = m v
[tex]p = 9.5 \cdot 4[/tex]
p = 38 kg.m/s
The filled table is included below
please help!!! zoom in to read it clearly
Answer:
imma try nd help cuz i havent seen anybody answer so
1.sara
2.same for both
3.tom
Explanation:
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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Which describes how electromagnetic waves travel?
Answer:
Travels through solid materials, and air.... but it can also travel through the vacuum of space
Explanation:
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