Answer:
- A vibrating object
- a medium to travel
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Which of the following can cause the substance to change phase? Select all that apply
mchange in temperature
u change in mass
change of shape
I change in pressure
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Answer:
change in temperature
Explanation:
just like a rock, if it is put in different temperatures, the different substance you get.
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Red light has the wavelength of 6.55 X 10 ^-7m. What is its frequency in hertz.
1. 4.58 hz
2. 4.58x10^14hz
3.21.8 hz
4. 2.18x^10-15 hz
a. Does this graph represent an endothermic or an exothermic reaction? Explain your answer.
b. What is the enthalpy change, ΔH, for this reaction? Show your work.
c. What is the activation energy, Ea, for this reaction? Show your work.
2. In a particular chemical reaction, the energy of the reactants is 30 kJ and the energy of the products is 5 kJ. The maximum energy of the system is 40 kJ.
a. Sketch a potential energy diagram for this reaction. Make sure to label the energy of the reactants, the energy of the products, the activation energy, and the enthalpy change for the reaction.
b. What is the activation energy for this reaction?
c. What is the enthalpy change for this reaction?
d. Is this reaction endothermic or exothermic? Explain your answer in two ways: first, using the energy values, and second, by referring to the shape of the graph.
3. The coating on the head of a match is highly flammable. When it burns, it releases a great deal of energy. However, before the match can burn, it must gain a small amount of energy from a spark. That spark is typically produced by striking (rubbing) the match head against a rough surface. Sketch and describe a potential energy diagram that represents the striking and burning of the match. Remember to label the diagram with the energy changes that occur. Your answer must include the potential energy diagram and a written description. (Note: you do not have to use actual energy values.)
Answer:
Exothermic reaction
Explanation:
Exothermic reaction relases energy while endothermic absorbs energy.
Answer:
eeeeeeeeeee
exothermic
Both mechanical and electromagnetic waves
Answer:
transmit energy
Explanation:
hope this helps u stay safe
Which law says that the induced voltage is directly proportional to the magnetic flux? A. Ohm’s Law B. Faraday’s Law C. Ampere’s Law D. Gauss’ Law E. Edison’s Law
Answer:
The correct answer is B) Faraday's Law
B. is the correct answer, ur now 2 grades higher bro
Michal has a T-shirt that glows in the dark he holds his T-shirt up to light source and then turns off the light his T-shirt continues to glow. Explain this phenomenon?
Answer: Residual fluorescence.
Explanation:
The T-shirt is first kept in the light source for 10 to 15 minutes or more and then when it is taken to a dark place it glows.
This phenomenon is known as residual fluorescence.The t-shirt contains phosphors. It is a visible light which is seen after it is energized.
When the T-shirt is under a light source it is basically in a charging mode and then after some time in the dark it glows due to the phosphors mixed in the fabric.
This is also in some of the toys,watches and other stuffs that glows in the dark.
A 1.200 kg car travels at 20 m/s. What is its momentum? P=mv
A)24000 kg m/s
B)14000 kg m/s
C)8000 kg m/s
D)1220 kg m/s
Answer:
A
Explanation:
Answer:
Answer A
Explanation:
P = mv
P = 1200 kg × 20 m/s
P = 2400 kg m/s
So the answer would be A
Using the velocity versus time graph, what was the average acceleration of the object for the first five seconds?
A) 4 m/s/s
B) 5 ms/s
C) 10 m/s/s
D) 20 m/s/s
Answer:
4 m/s²
Explanation:
a = Δv / Δt
a = (20 m/s − 0 m/s) / (5 s − 0 s)
a = 4 m/s²
Acceleration of a moving body is the rate of change of its velocity. The average acceleration of the object for the first five seconds is 4 m/s².
What is acceleration?Acceleration of a body is the rate of change of its velocity. Acceleration is a vector quantity and have both magnitude and direction. The change in magnitude or direction or both of velocity changes results in acceleration of the object.
Acceleration is the ratio of change in velocity to the change in time. Thus, it can be written as :
a = ΔV/ΔT
Here, the time changes from 0 to 5 seconds and the velocity changes from 0 to 20 m/s. Hence, the average acceleration is calculated as follows:
a = 20 - 0 m/s / ( 5 - 0 s)
= 4 m/s²
Therefore, the average acceleration of the object in first 5 seconds is 4 m/s².
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Besides air pollution, the student was concerns about water/ocean pollution. They heard many recent issues of too much plastic in the ocean and other pollutants in the water. The pie chart below provides data on the sources and amounts of different pollutants entering the oceans.
first picture
The student read a news article that discussed the increase in amount of pollutants entering oceans and washing up on shores. The article included this image.
second picture
pick the answer
The greatest reduction in pollutants entering the ocean could be achieved if it were possible to reduce farm runoff/transportation/air pollutants/sewage/litter/ orindustry waste.
Answer:
Sewage
Explanation:
It has the greatest percentage out of the pie chart.
Farah is doing an experiment that involves calculating the speed of a longitudinal wave. What will most likely happen if she increases the temperature in the room?
The amplitude of the wave will increase.
The amplitude of the wave will decrease.
The speed of the wave will increase.
The speed of the wave will decrease.
Answer:
Explanation:
it will result in rise in frequency of the wave ...
so speed of the wave will increase...
If Farah increases the temperature in the room during the experiment, C. the speed of the wave will increase.
What is a longitudinal wave?A longitudinal wave is the opposite of a transverse wave and it can be defined as a type of wave that usually travel in the same direction of its oscillation.
Generally, there is a direct (linear) relationship between the speed of the wave and temperature.
This ultimately implies that, if Farah increases the temperature in the room during the experiment, the speed of the wave will increase due to an increase in its frequency.
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hii:) the last 2 paragraphs are confusing, I thought mass doesn’t change?
Answer:
It's true that mass doesn't change
but because of difference in gravitational force on earth and moon, the scale used for weighing weight gives different reading. If we use the scale used for measuring the mass then the reading will be same. I think this was confusing you
Andrew Haber is an astronaut in space, far away from gravitational and frictional forces. He throws a tennis ball. The ball will:
A) come back to him
B) gradually come to rest
C) continue to move in a straight line with uniform velocity
D) come to rest abruptly
Answer:
the answer is C.
Explanation:
continue to move in a straight line with uniform velocity.
Andrew Haber is an astronaut in space, far away from gravitational and frictional forces. He throws a tennis ball. The ball will continue to move in a straight line with uniform velocity. The correct option is C.
What are gravitational and frictional forces?Gravity always pulls things down, whether it's a desk, a book, or a person. As a result, gravity pulls you down to the ground as you jump. But friction doesn't drag things down. But friction doesn't drag things down.
The direction of the push used to move the body is the opposite of the direction of friction. Because of the increased force of friction, sliding a body across a surface becomes more difficult when gravity is strong.
Therefore, the correct option is C) continue to move in a straight line with uniform velocity.
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help me ASAP plzzzzzzzz!!!!!!
Answer:
A long handle
Explanation:
A spanner is basically a wrench, you would also want to use a long handled wrench in order to have more mechanical advantage and be able to apply more torque. This can be proven as well using a simple physics formula:
[tex]t = fd[/tex]
where the variables are:
t = torque
f = applied force
d = perpendicular distance from fulcrum to where the force is applied
It is clear that keeping the applied force constant, if you enlarge the perpendicular distance, d, you will be able to apply more torque and therefore have an easier time releasing this nut.
Does an apple, potato, and onion all taste the same if you eat them with your nose plugged?
A.) Yes
B.) No
Answer: A yes
Explanation:
Answer:
A) Yes
Explanation:
Majority of what we perceive as "taste" is actually due to our sense of smell.
If we remove the contribution of smell by plugging your nose, many people have reported that apples, potatoes and onions indeed do "taste" the same.
Help Plzzzzzzz I need help ASAP!!!!!!!
Answer: A spanner with a long handle
Explanation: The use of a spanner for opening the nut of a simple machine will employ the principle of moment.
The force apply to the nut is considered as load while the force applied to the spanner is considered to be effort.
Before the nut can be opened, the effort must overcome the load.
Since moment is the product of a force and the perpendicular distance, the spanner with a long handle will produce a higher moment.
Therefore, a spanner with a long handle will be preferred.
The Theory of General Relativity, proposed by Albert Einstein, has given scientists a way to
understand
_ as it relates to bodies in motion.
(1 point)
matter
entropy
gravity
energy
If you place small pieces of tissue paper near the balloon in Picture 2, they would probably stick to the
balloon. Explain why.
Answer:
The balloon has more negative charges than positive charges. The tissue paper has a neutral charge.The static electricity pulls on the tissue paper lifting it up.
People began to study classical thought wing the Renaissance to
Answer:
Explanation:
to better themselves and to be good educated people
Answer:
A. better themselves.
Explanation:
just did test edg2020
If you sit close to a campfire, the fire warms you. Describe how thermal energy is transferred from the fire to you.
Answer:
Explanation:
When you sit by a campfire, most of the heat you are receiving from the fire does not come from hot air. ... This radiation carries energy which is converted to heat when it hits another object and is absorbed. In contrast, conduction involves the direct movement of heat through an object.
Answer:
When you sit by a campfire, most of the heat you are receiving from the fire does not come from hot air. ... This radiation carries energy which is converted to heat when it hits another object and is absorbed. In contrast, conduction involves the direct movement of heat through an object.
Explanation:
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what is the mass of mr. thomson’s prius if his kinetic energy is 641300 J when he is driving at a velocity of 22 meters per second on the highway? please show work
Explanation:
It is given that
The kinetic energy of Mr. Thomson’s prius, K = 641300 J
He is moving with a velocity, v = 22 m/s
It is required to find the mass of Mr. Thomson’s prius.
Due to his motion, a kinetic energy will possess by him. The mathematical form of kinetic energy is given by :
[tex]K=\dfrac{1}{2}mv^2[/tex]
Solving for m
[tex]m=\dfrac{2K}{v^2}[/tex]
Plugging all the values, we get :
[tex]m=\dfrac{2K}{v^2}\\\\m=\dfrac{2\times 641300}{(22)^2}\\\\m=2650\ kg[/tex]
So, the mass of Mr. Thomson’s prius is 2650 kg.
An object has a forward force of 100N and a reverse force of 25N. What is the resultant force?
Given:
An object has a forward force = 100NAn object has a reverse force = 25NTo find out:
What is the resultant force?
Solution:
Resultant Force = Forward force + Reserve force
= 100 N + ( - 25 N )
= 75 N
Answer:
75 N
Explanation:
The resultant force can be found using the following formula:
F=forward force + reverse force.
The forward force is 100 N.
The reverse force is 25 N. Since it is a reverse force, it is actually equal to -25 N.
forward force=100 N
reverse force= -25 N
Substitute these values into the formula
F=100 N + -25 N
Add 100 and -25
F= 75 N
The resultant force is 75 Newtons.
A baby cow has a mass of 100 kg and chases its mother at a speed of 0.5
m/s. What is the magnitude of its momentum?
Answer: 50 kgm/s
Explanation:
Given that the
Mass M = 100kg
Velocity V = 0.5 m/s
Momentum can be defined as the product of mass and velocity. That is,
Momentum = MV
Substitute the values of M and V into the formula
Momentum = 100 × 0.5
Momentum = 50 kgm/s
Therefore, the magnitude of momentum is 50 kgm/s
Answer:
50 kg-m/s
Explanation:
This is how sodium appears in the periodic table. An orange box has N a at the center and 11 above. Below it says sodium and below that 22.99. A blue arrow points to 22.99. The arrow is pointing to sodium’s number of neutrons. number of valence electrons. combined number of neutrons and protons. combined number of electrons and protons.
Answer:
I believe it is answer C.
Explanation:
Answer:
C: atomic mass
Explanation:
what is the mass of mr. thomson’s prius if his kinetic energy is 641300 J when he is driving at a velocity of 22 meters per second on the highway? please show work
Answer:
Mass, m = 2650 kg
Explanation:
We have,
Kinetic energy of Mr. Thomson’s prius is 641300 J
He is moving with a velocity of 22 m/s
It is required to find the mass of Mr. Thomson’s prius.
Kinetic energy,
[tex]K=\dfrac{1}{2}mv^2[/tex]
Plugging all the values, we get :
[tex]m=\dfrac{2K}{v^2}\\\\m=\dfrac{2\times 641300}{(22)^2}\\\\m=2650\ kg[/tex]
So, the mass of Mr. Thomson’s prius is 2650 kg.
A block with mass 0.470 kg sits at rest on a light but not long vertical spring that has spring constant 85.0 N/m and one end on the floor. A second identical block is dropped onto the first from a height of 4.40 m above the first block and sticks to it. What is the maximum elastic potential energy stored in the spring during the motion of the blocks after the collision?
Answer: elastic potential energy = 20.27 J
Explanation:
Given that the
Mass M = 0.470 kg
Height h = 4.40 m
Spring constant K = 85 N/m
The maximum elastic potential will be equal to the maximum kinetic energy experienced by the block.
But according to conservative of energy, the maximum kinetic energy is equal to the maximum potential energy experienced by the block of mass M.
That is
K .E = P.E = mgh
Where g = 9.8m/s^2
Substitutes all the parameters into the formula
K.E = 0.470 × 9.8 × 4.4
K.E = 20.27 J
Where K.E = maximum elastic potential energy stored in the spring during the motion of the blocks after the collision which is 20.27J.
The maximum potential energy stored in the spring during the motion of the blocks is 20.39 J.
The given parameters;
mass of the block, m = 0.47 kgspring constant, k = 85 N/mThe extension of the spring is calculated as follows;
[tex]F =kx\\\\mg = kx\\\\x = \frac{mg}{k} \\\\x = \frac{0.47 \times 9.8}{85} \\\\x = 0.054 \ m[/tex]
The maximum potential energy stored in the spring during the motion of the blocks is calculated as;
[tex]P.E = \frac{1}{2} kx^2 \ + mgh\\\\P.E = \frac{1}{2} (85)(0.054)^2 \ + \ (0.47)(9.8)(4.4)\\\\P.E = 20.39 \ J[/tex]
Thus, the maximum potential energy stored in the spring during the motion of the blocks is 20.39 J.
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R1 -4.00
M
- V = 12.0 V
Т.
1. Using Ohm's Law, Calculate the current / flowing
through the circuit in Figure 1.
Show all work.
Answer: V = 12.0 V
Explanation:
Which question could be answered using the scientific method?
Why does my dog like to sit on the sofa?
Would Mars be a fun place to live?
Are butterflies happy?
Do vitamins help people stay healthy?
Answer:The vitamins one.
Explanation:
Answer:
d. do vitamins help people stay healthy
Explanation:
flvs
Help||| When a stringed instrument is out of tune, the player with tighten or loosen the string. If the instrument is initially flat, should they tighten or loosen the string? In the context of this experiment, explain your reasoning.
Answer:
So if its regular, you would always tighten it. Here's the reasoning:
"When you lower the pitch by releasing tension, there might be slack in the gears in the tuning machines, which might make the string go below the intended pitch. By going further down and approaching the target note from below, there will be force applied to the gears and when you've reached the correct pitch the gears have less potential to move. So your teacher is correct."
Therefore the answer is TighteningAnswer: So if its regular, you would always tighten it. Here's the reasoning: "When you lower the pitch by releasing tension, there might be slack in the gears in the tuning machines, which might make the string go below the intended pitch.
Explanation:
"When you lower the pitch by releasing tension, there might be slack in the gears in the tuning machines, which might make the string go below the intended pitch. By going further down and approaching the target note from below, there will be force applied to the gears and when you've reached the correct pitch the gears have less potential to move. So your teacher is correct."
Is this a scientific model? Use complete sentences to explain why or why not.
Answer:
it is a scientific model if you want to research where in the world is vegetation located.
suppose that two point charges, each with a charge of +1.00 C, are separated by a distance of 1.0m, will the chargers attract or repel?
Answer:
They would repel because they are opposites
Explanation:
The two point charges will repel each other with a force of 9×10⁹N because they both have the same nature of the charge.
Electrostatic force:Given two point charges with a charge of +1.00 C. Separated by a distance of 1 m.
So, q₁ = q₂ = 1C and distance r = 1m
Since the charges are alike, that is both of them are positive charges, they will repel each other with an electrostatic force given by:
F = kq₁q₂/r²
where k is Coulomb's constant.
F = 9×10⁹×1²/1²
F = 9×10⁹N
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