Answer:
require a medium to propagate
Explanation:
this is because electromagnetic waves can travel through vacuum at the speed of 3.0 x 10^8 m/s
because they don't need particles to transfer energy
hope this helps
True or False
Chemical reactions in batteries produce a voltage difference between the positive
and negative terminals.
Answer:
true
Explanatiohope this helps
The formation of new elements through the process of fusion in a star’s core stops at iron. How are elements larger than iron formed?
Answer:
During a supernova, the star releases very large amounts of energy as well as neutrons, which allows elements heavier than iron, such as uranium and gold, to be produced. In the supernova explosion, all of these elements are expelled out into space.
hope this helps.
Explanation:
The mass of an object is the measure of what characteristic of the object?
O A. its volume
OB. the space it occupies
O c. the amount of matter it has
O D. its weight
please help asap
How is electric charge different than gravity? A. Electric charge has a smaller constant B. Gravitational force can only be positive C. Charges can be either positive or negative for electric charge D. The calculation of the radius is different
B and C are both true statements.
DC current is less than AC current
true\false
Answer:
False
Explanation:
.......................
Calculate the energy used by a 0.011 kW lightbulb in 1 minute. Use the formula: energy (J) = power (W) × time (s)
Answer:
660
Explanation:
0.011kW = 11W
energy = 11 x 60
= 660J
Mr. White drops a bowling ball and a feather from the top of the Washington Monument.
a) Which will hit the ground first? Why?
b) If Mr. White were to repeat this experiment inside a vacuum chamber, which would hit the ground first? Why?
If you can provide some explanation I would greatly appreciate it! :)
Answer:
A) The bowling ball will hit the ground first. It is heavier, which has greater density, allowing it to reach the ground first.
B) Feather. If you want to be able to blow a bowling ball in a vaccum cleaner, it's almost impossible since it's very heavy. If it's a feather, it would be easier as it's light and the air inside it is able to force it down.
Note: I haven't learnt physics at all yet, this is just an attempt. I'm in 7th grade currently and I will probably be taking physics sometime in 9th grade.
Write 3 things you want to learn about the ocean.
Answer: How it was created, The frequency of the waves, and is the water salty enough to kill someone.
Explanation:
Just from my brain.
Answer: the ecosystem , differnt species of fish, and ship wrecks
Explanation:
:)
is 468km per minute describing speed or velocity
pllllllllllllllllllssssssssss help me will give brainiest if correct
Answer:
I believe it is the same as before-Electrical energy is transformed into heat and light energy.
Explanation:
Hope this helps'-'
Chemical energy (in his muscles) ===> kinetic energy ===> electrical energy ===> light energy and a little bit of heat energy
can someone help me fill in the two boxes.
Answer:
Explanation:
I believe what you're looking for is :
Opposites
Density
Could be wrong but I think so.
Explain two negative effects of friction
disadvantages
Explanation:
releases heat when not required
opposes motion
Your teacher gives you samples of the following elements. Which sample is shiny but does not conduct heat and electricity well? (DOK 2)
A.
fluorine (F)
B.
silver (Ag)
C.
germanium (Ge)
D.
neon (Ne)
Fluorine is the sample which is shiny but does not conduct heat and electricity through it. The flow of electricity requires the flow of electrons or charged particles. Thus, the correct option is A.
What are conductors?
A conductor is a substance, chemical element, or a material which allows electricity and heat to flow through it. In a conductor, the electrical charge carriers which are usually electrons or positive and negative ions, move easily from one atom to another atom when a particular amount of voltage is applied.
Fluorine is a shiny element however it does not conduct heat and electricity through it. It is the most electronegative atom and is very reactive in nature. It only gains electrons and does not lose them. And because of this property of fluorine, it restricts the movement of electrons through it and fails to conduct electricity.
Therefore, the correct option is A.
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Find the following answer based on the image.
We are given:
Mass of Neptune = 1.03 * 10²⁶ kg
Distance from the center of Neptune (r) = 2.27 * 10⁷
now, computing the value of the acceleration due to gravity (g)
Finding g:
We know the formula:
g = G(mass of planet) / (r)²
g = [6.67 * 10⁻¹¹ * 1.03*10²⁶] / (2.27*10⁷) [since G is 6.67*10⁻¹¹]
g = (6.87 * 10¹⁵) / (5.15 * 10¹⁴)
which can be rewritten as:
g = (6.87 * 10¹⁵ * 10⁻¹⁴) / 5.15
g = (6.87 * 10¹⁵⁻¹⁴) / 5.15
g = (6.87/5.15) * 10
g = 1.34 * 10
g = 13.4 m/s² (approx)
Define work What is the unit for work? For Physics, thanks.
Answer:
Work, in physics, measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement
Explanation:
The rebounder in basketball has a vertical leap (that is, the vertical movement of a fixed point on their body) of 106 cm .
Answer:
[tex]u = 4.56m/s[/tex]
[tex]T = 0.94s[/tex]
Explanation:
See comment for complete question
Given
[tex]h = 106cm[/tex] --- Height
Solving (a): The initial speed
To do this, we make use of the third equation of motion
[tex]v^2=u^2+2ah[/tex]
In this case:
[tex]v = 0m/s[/tex] --- final velocity at the maximum height
[tex]a = -g = -9.8m/s^2[/tex]
[tex]h = 106cm[/tex]
Convert height to metres
[tex]h = 1.06m[/tex]
Substitute these values in [tex]v^2=u^2+2ah[/tex]
[tex]0^2 = u^2 +2 *(-9.8) * 1.06[/tex]
[tex]0^2 = u^2 -20.776[/tex]
Collect Like Terms
[tex]u^2 =20.776[/tex]
Take the positive square root of both sides
[tex]u =\sqrt{20.776[/tex]
[tex]u = 4.55806976691[/tex]
[tex]u = 4.56m/s[/tex] --- approximated
Hence, the initial velocity is 4.56m/s
Solving (b): Time spent in the air.
This will be solved using the first equation of motion.
[tex]v = u + at[/tex]
Where:
[tex]v = 0m/s[/tex] --- final velocity at the maximum height
[tex]a = -g = -9.8m/s^2[/tex]
[tex]u = 4.56m/s[/tex]
So, we have:
[tex]0 = 4.56 - 9.8t[/tex]
Collect Like Terms
[tex]9.8t = 4.56[/tex]
Make t the subject
[tex]t = \frac{4.56}{9.8}[/tex]
[tex]t = 0.46530612244[/tex]
[tex]t = 0.47s[/tex] --- approximated
The above is the time it reaches the maximum height.
The time it stays in the air is:
[tex]T = 2t[/tex]
This gives:
[tex]T = 2*0.47s[/tex]
[tex]T = 0.94s[/tex]
Change the following back to a standard number... (3.15 x 10-3)
Think about what you observed in the Sim and the information the lead chemist sent you about the soda can. Which substance in the Sim best represents water (substance B or C)? Explain your answer in the space below.
Answer:
Substance C.
Explanation:
Substance C changed phase by condense and melted faster than substance B, which best represents liquid.
What forces act to pull the poles of a magnet together, or to push them apart?
Answer:
Gravity,
I hope this correct
A pencil aapears bent when dippes partially in a beaker contaning water why?
i
the pencil appears to be bent when dipped in water because the reflected light ray from the immersed part of the pencil refracts when travels from water to air. however, it appears to be bent because our eyes expect light to travel in straight line
What is another name for the rare earth elements?
a.
Group 1
c.
Group 6
b.
Lanthanide
d.
Alkaline Earth
Explanation:
lanthanide is another name for the rare earth
elements.
Answer:
use common sense
Explanation:
An ocean wave has a frequency of 3 waves per second, and the waves are
5 meters apart. What is the speed of the wave?
Answer:
v = λf = (4 m)(3 Hz) = 12 m/s
Explanation:
What is elementary entities?
Answer:
Answer: Elementary Entities are any of several entities, such as electrons, neutrons, or protons, that are less complex than atoms and are regarded as the constituents of all matter.
Identify each part of this chemical equation that describes the burning of methane and oxygen. B (blue box): D (number): E (purple box):
Answer:
The correct answer is -
A (the entire green box): Chemical Equation
B (the blue box): Reactants
C (the arrow): Reacts to Form
D (the number): Coefficient
E (the purple box): Products
Explanation:
The chemical reaction of burning methane and oxygen is as follows;
Here, the green part A is the chemical equation that includes various parts that are reactants B, methane, and oxygen, C is an arrow that indicates the formation of products.
2 is here coefficient that indicates the moles of the oxygen which forms carbon dioxide and water in box E is products
Answers:
A (the entire green box): chemical equation
B (the blue box): reactants
C (the arrow): reacts to form
D (the number): coefficient
E (the purple box): products
Explanation:
As seen in the picture below,
Can someone please explain the conservation of momentum? I want to be a rocket scientist lol
will give brainliest
A 15 kg box sits still on a rough inclined plane (no math required here).
Why isn’t the box sliding down the hill?
Answer:
Explanation:
The force of friction equals the sine component of the force due to gravity
1. If two objects each with the mass of 2.0 x 10^2 kg, produce gravitational force between
them of 3.7 x 10^-6N , What is the distance between them ?
Answer:
r = 0.849 m
Explanation:
Given that,
The masses of two objects, [tex]m_1=m_2=2\times 10^2\ kg[/tex]
The force between the objects, [tex]F=3.7\times 10^{-6}\ N[/tex]
We need to find the distance between the masses. The force between two objects is given by the relation as follows :
[tex]F=G\dfrac{m_1m_2}{r^2}[/tex]
r is the distance between them
[tex]r=\sqrt{\dfrac{Gm_1m_2}{F}} \\\\r=\sqrt{\dfrac{6.67\times 10^{-11}\times (2\times 10^2)^2}{3.7\times 10^{-6}}} \\\\r=0.849\ m[/tex]
So, the distance between them is 0.849 m.
LOOK AT PICTURE FOR QUESTION
What is the second daughter element from the nuclear fission reaction shown below? (solve
for x) *
(3 Points)
Answer:Cs
Explanation: for this one 92-37 is 55
how jolibee mascot move their eyes?
Answer: i think they control the eyes to move them.
Explanation:
Which of the following is an example of physical change?
A. Mixing baking soda and vinegar together, and this causes bubbles and foam.
B. A glass cup falls from the counter and shatters on the ground.
C. Lighting a piece of paper on fire and the paper burns up and leaves ashes.
D. Baking a birthday cake for your mother.
B. A glass cup falls from the counter and shatters on the ground.
What is a physical change?A physical change is a change in which no new substance is formed after the change occurs
When a glass cup falls to ground , no new substance is formed, hence this change is a physical change
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