(URGENT)
Which describes increasing the efficiency of an energy resource?
A>Making cars that get better gas mileage
B>Using biomass instead of coal
C>Turning off the lights when leaving a room
D>Switching from coal to solar
Answer:
A Making cars that get better gas mileage
Explanation:
Getting cars that gets better gas mileage are increasing the efficiency of fossil fuels.
Efficiency is the tendency to avoid wastage of resources. When the most value is gotten from a resource, the efficiency is high. A better car engine and other electrical components of the car that reduces the wastage of fuel helps fuel efficiency.worth brainliest!! help me on both and explain I will spam ur questions if u answer something dumb
Answer:
Answers are below hopefully they're correct and what u need
Explanation:
1. Step 1: Given
The distance is 600 km, since 100(speed) x 6 (time) = 600
2. Step 2: Formula
s = d/t
d = t x s
t = d/s
3. Step 3: Substitue
s = 600/6
d = 100 x 6
t = 600/100
4. Step 4: Solve
600/6 = 100
100 x 6 = 600
600/100 = 6
Step 5: Answer
Therefore, the distance is 600km, the speed or rate is 100 km/hr, and the time is 6hrs.
NUMBER 2
1. Step 1: Given
Distance = 200 m
Rate or speed = 8m/s
Time = ?
2. Step 2: Formula
s = d/t
d = t x s
t = d/s
3. Step 3: Substitue
t = 200/8
s = 200/25
d = 25 x 8
4. Step 4: Solve
200/8 = 25
25 x 8 = 200
200/25 = 8
5. Step 5: Answer
Therefore, the time is 25sec, distance is 200m, and speed or rate is 8m/s
Answer:
vivi I is here and I will come up was wondering what do you think about this I don't know
The table below describes some processes in which food is changed as it travels through the digestive system.
Which of the processes describe only physical changes in the food particles?
Processes 1, 2, 3, and 4
Processes 1, 3, and 6
Processes 2, 5, and 6
Processes 1, 3, and 4
Answer:
processes 1,3, and 4
Explanation:
i think
Teeth tear the food, the tongue reforms the food, and the stomach muscles break the food into small pieces are physical changes. Therefore, option (4) is correct.
What is a physical change?A physical change can take place when the identity of the matter does not but some of the characteristics of the matter change. Physical changes of matter are categorized as reversible and irreversible in nature. For example, the freezing of water is a reversible physical change since the ice cube can melt again.
Physical change can be described as a kind of change where only the physical properties of substances such as solubility, color, odor, etc. can change. During physical changes, no chemical bonds are formed or broken between atoms.
The chemical nature and chemical composition of the matter remain unchanged during a physical change.
In the digestive system, the breaking of food by teeth, tongue, and stomach muscles is a physical change. The food mixed with acids and broken by enzymes is a chemical change.
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Imagine you are a water molecule, carbon atom, or nitrogen atom that is inside a cow. Write a brief explanation of how you got from the atmosphere (the air) into the biosphere (the living cow). *
Answer:
Explanation:
The processes involved in each of the molecules involved are different.
For example, water molecules that have condensed in the atmosphere (in the cloud) return back to the earth through precipitation in the form of rain water. These cows drink these water from various water bodies around them. This is one process in which water molecules move from the atmosphere into the living cow.
In the case of carbon and nitrogen atoms; the air the cow breath in consists of nitrogen, oxygen, carbon dioxide and some other gases. These gas molecules move (from the atmosphere) into the cow through the process of respiration.
How long does it take for an 8 kg pumpkin to hit the ground if dropped from a height of 55 m.
Answer:
t = 3.35 s
Explanation:
It is given that,
Mass of a pumpkin, m = 8 kg
It is dropped from a height of 55 m
We need to find the time taken by it to hit the ground.
Initial velocity of the pumpkin, u = 0
Using second equation of motion to find it as follows :
[tex]h=ut+\dfrac{1}{2}at^2\\\\t=\sqrt{\dfrac{2h}{g}} \\\\t=\sqrt{\dfrac{2(55)}{9.8}} \\\\t=3.35\ s[/tex]
So, it will take 3.35 seconds to hit the ground.
A 3.0 kg block is pushed 2.0 m at a constant velocity up a vertical wall by a constant force applied at an angle of 28.0. with the horizontal, as shown in the figure.
The acceleration of gravity is 9.81 m/s^2. If the coefficient of kinetic friction between
the block and the wall is 0.40, find
a) the work is done by the force on the block.
Answer in units of J.
b) the work done by gravity on the block.
b) the work done by gravity on the block.
Answer:
a) [tex]w_{Fy} = 237.61713[/tex]J
b) [tex]w_{g}=-58.86[/tex] J
c) [tex]N=223.44641[/tex]N
Explanation:
Key: theta = θ kinetic friction = μ α = 180°
a) Work of Force put on block
Remember that you need both sides x & y
Equations:
[tex]w_{F}=F_{x} cos[/tex] | [tex]w_{F}=F_{y} sin[/tex]θ[tex]_{net} F_{x} =0[/tex] | [tex]_{net} F_{y} =0[/tex] [tex]N=Fcos[/tex]θ | [tex]F_{y} sin[/tex]μ[tex]N-mg=0[/tex] | [tex]F_{y} sin[/tex][tex]F_{y} =\frac{mgd sin(theta)}{sin(theta)-(kinetic friction)cos(theta)}[/tex]-μ[tex]Fcos[/tex]θ[tex]=mg[/tex] |[tex]w_{Fy} =Fdsin[/tex]θ | [tex]w_{Fy} =\frac{(3*9.81)sin(28)}{sin(28)-(0.40)cos(28)}[/tex] | [tex]w_{Fy} = 237.61713[/tex]Jb) Work of Gravity on block
[tex]w_{g} =F_{g}dcos[/tex]α [tex]w_{g} =mgdcos[/tex]α [tex]w_{g}=(3)(9.81)(2)cos(180)[/tex] [tex]w_{g}=-58.86[/tex]Jc) Magnitud of Normal Force
[tex]F=\frac{mg}{sin(theta)-(kinetic friction)cos(theta)}[/tex][tex]F=\frac{3*9.81}{sin(28)-(0.40)cos(28)}[/tex][tex]F = 253.06871[/tex][tex]N=Fcos[/tex]θ[tex]N=(253.06871)cos(28)[/tex][tex]N=223.44641[/tex]NHope it helps
What would be the daughter product of the beta decay of lead-212 and what would be the daughter product of the alpha decay of polonium-216?
Answer:
lead with Z = 82 is transformed into Bismuth with Z = 73
The Po with Z = 84 becomes Pb with Z = 82
Explanation:
Beta decay occurs when a neutron emits an electron and an anti neutrino from the atomic nucleus, therefore the atomic number of the material increases by one unit.
Pb + e + ν → Bi
lead with Z = 82 is transformed into Bismuth with Z = 73
In alpha decay, a helium nucleus is emitted from the nucleus of the atom, therefore the atomic number decreases by two units.
Po +α → Pb
The Po with Z = 84 becomes Pb with Z = 82
1 kg ball and a 9 kg ball have the same Ex. Compare
their speeds.
Answer:
The speed of 1 kg ball is 3 times of the speed of 9 kg ball.
Explanation:
It is given that, 1 kg ball and 9 kg ball have the same kinetic energy.
We need to compare their speeds.
The kinetic energy of an object is given by :
[tex]K=\dfrac{1}{2}mv^2[/tex]
Where
m is mass and v is speed
As kinetic energy is same. So,
[tex]m_1v_1^2=m_2v_2^2\\\\\dfrac{v_1^2}{v_2^2}=\dfrac{m_2}{m_1}\\\\\dfrac{v_1^2}{v_2^2}=\dfrac{9}{1}\\\\\dfrac{v_1}{v_2}=\dfrac{3}{1}\\\\v_1=3v_2[/tex]
So, the speed of 1 kg ball is 3 times of the speed of 9kg ball.
Answer the following
Answer: There is nothing here
Explanation: Could you please add a picture or something
A 25 N force is used to push a box across a floor against a frictional force of 14 N. The box accelerates from rest to a speed of 4 m/s in 16 s. What is the mass of the box?
todjghozjfh-xjdfg .FExplanation:dthgzdfhsfhfh
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If the 5-N force and the 12-N force form a 90 degree angle, what is the magnitude of the force acting in the direction of the dashed arrow
Answer:
13NExplanation:
Kindly see attached file for your reference
Step one:
given data
the horizontal component of the force= 12N
the vertical component of the force= 5N
The dashed arrow represents the hypotenuse of the triangle, hence the resultant of the force system.
By implication of this, we will use the Pythagoras theorem to solve for the resultant force
Step two:
[tex]F_R=\sqrt{F_H^2+F_V^2}\\\\F_R= \sqrt{12^2+5^2}\\\\F_R=\sqrt{144+25}\\\\F_R=\sqrt{169}\\\\F_R=13N[/tex]
NEED HELP ASAP, WILL GIVE BRAINLIEST
Which phrase describes air pressure?
decreases with denser air
decreases as altitude decreases
equals mass divided by volume
decreases as a result of fewer air particles pushing down
Answer:
decreases with denser air
Answer:
b) decreases as altitude decreases
Explanation:
What is the water pressure at a depth of 30m in pascals?
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The water pressure at depth h from the water surface is obtained from the following equation.
[tex]Pressure = (density) \times (gravity \: \: acceleration) \times (depth \: \: from \: \: the \: \: water \: \: surface) \\ [/tex]
[tex]density = 1000 \: \: \frac{kg}{ {m}^{3} } [/tex]
[tex]gravity \: \: acceleration = 10 \: \: \frac{m}{ {s}^{2} } [/tex]
[tex]depth \: \: from \: \: the \: \: the \: \: water \: \: surface = 30 \: \: m \\ [/tex]
______________________________________
[tex]P = 1000 \times 10 \times 30[/tex]
[tex]P = 300,000 \: \: pascals[/tex]
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I NEED THIS ASAP
The labeled images each represent the wave patterns found in the electromagnetic wave spectrum.
Which image is correctly labeled for frequency, wavelength, and radiant energy?
Answer:
Srry !!!
Explanation:
Image is not clear.
Hi thanks to whoever answers thanks! will give brainliest
What is the difference in degrees
Celsius between the hottest stars and the
coolest stars?
A 20-kg dog on ice skates is accelerating at 2 m/s2. What is the net
force on the dog?
Answer:
22
Explanation:
please help!!!!!!!!!!
Answer:
the line b aka the option d
Explanation:
Water is boiled. The resulting steam is blown again huge turbine blades. The turbine blades spin in a magnetic field, producing electricity. The electricity is used to light a lamp. Describe the energy conversions involved.
Answer:
Explanation:
A turbine is a mechanical device that can be used for the conversion of one form of energy into another.
The boiled water generates thermal energy which is blown against a huge turbine blades. The thermal energy is converted to mechanical energy (which drives the blades of the turbine), and sound energy in the turbine. The spinning blades thereby cut the magnetic field as they rotates inducing electric current (Fleming's left hand rule), thus electrical energy is produced.
The electrical energy is now converted to light energy and heat energy by the lamp.
Let's assume you have a mass of 75 kg and your jeep has a mass of 1500 kg. How much greater is the force of gravity on the jeep?
A. 0.05 times
B. 20 times
C. 1500 times
Answer:
20 times
Explanation:
75kg × 20 = 1500kg
Amount of time greater is the force of gravity is 20 times
Given:
Mass of person = 75 kg
Mass of jeep = 1500 kg
Find:
Amount of time greater is the force of gravity
Computation:
Amount of time greater is the force of gravity = Mass of jeep / Mass of person
Amount of time greater is the force of gravity = 1500 / 75
Amount of time greater is the force of gravity = 20 times
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can someone help please
A 2kg ball is thrown with an acceleration of 15m/s2. A 2kg ball is thrown with an acceleration of 10m/s2. Which ball
will have a greater net force? Calculate the net force of both balls to justify your answer.
If a car has a constant acceleration of 4 m/s², starting from rest, how far has it traveled after 5 seconds?
Answer:
100 meters
Explanation:
d=at^2 correct? So you plug in acceleration and time. d=(4)(5)^2 which when using pemdas turns out to 100 meters.
What has occurred when a solid forms out of the mixing of two liquids in a chemical reaction?
O melting
O gas formation
O combustion
O precipitate formation
Answer:
D is the correct answer
Explanation:
solid is a new substance, and it's called a precipitate.
The precipitate formation is occurred when a solid forms out of mixing two liquids. Hence, precipitate formation is the correct option.
The given problem is based on the chemical reactions and substances formed due to the chemical reactions. The given question says that some solid substance forms out of mixing two liquid substances in a chemical reaction. Now, let us analyze the options:
Melting is the process of conversion of solid substance into liquid substance upon the absorption of heat. Since some solid substance as per the given problem. So clearly melting is not correct option.The gas formation clearly highlights that some gaseous substance is forming. So despite of formation of solid substance in the problem, the gas formation is not the correct option. Combustion involves the production of heat and light, which are not under the category of solid substance. Hence, combustion is not the correct option.Precipitates are the solid substances that are formed in a chemical reaction between the reactants (liquids). Hence, this justifies the given problem and precipitate formation is a correct option.Thus, we can conclude that precipitate formation is occurred when a solid forms out of mixing two liquids.
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Pls help! What would be considered an antonym for law of superposition??
Answer:
do you have any pictures or any answers we can choose from?
Explanation:
This is an incomplete question.
What is the momentum of an 18-kg object moving at 0.5m/s
Answer:
Momentum = 9kgm/s
Explanation:
Given the following data;
Mass = 18kg
Velocity = 0.5m/s
Momentum can be defined as the multiplication (product) of the mass possessed by an object and its velocity. Momentum is considered to be a vector quantity because it has both magnitude and direction.
Mathematically, momentum is given by the formula;
[tex] Momentum = mass * velocity [/tex]
Substituting into the equation, we have;
Momentum = 18 * 0.5
Momentum = 9kgm/s
Therefore, the momentum of the object is 9kgm/s.
What is the power of a crane that does 5.60 kJ of work in 2.80 s?
Answer:
2000 WExplanation:
The power of the crane can be found by using the formula
[tex] p = \frac{ \orange{w}}{ \orange{t}} \\ [/tex]
w is the workdone
t is the time taken
From the question we have
[tex]p = \frac{5600}{2.8} \\ [/tex]
We have the final answer as
2000 WHope this helps you
There is a species of Darwin’s finch on the Galapagos Islands that can exert a force of 205N with its beak as it cracks open a seed case. If its beak moves through a distance of 0.40 cm during this operation, how much work does the finch do to get at the seed inside the case?
Answer:
0.82 J
Explanation:
We know that work done W = Fd where F = force and d = distance moved in the direction of the force.
Now, the finch on Galapagos Islands exerts a force of 205 N with its beak as it cracks open a seed case. So, F = 205 N. If the beak moves a distance of 0.40 cm during this operation, then d = 0.40 cm = 0.004 m.
We now compute W.
So, W = Fd
= 205 N × 0.004 m
= 0.82 J
So the finch does work of 0.82 J to get at the seed inside the case.
1. What is the wavelength of a sound wave with a frequency of 50 Hz, if the Speed of sound is 343 m/s.
2.A sound wave in a steel rail has a frequency of 620 Hz and a wavelength of 10.5 m. What is the speed of sound in steel?
3.A wave has a frequency of 10 Hz and a wavelength of 30m. What's its speed?
1.6.86
2.59.04
3.3
Thats the answer I think
If a body is sliding on a inclined plane of angle 30° angle of friction is
Answer: don´t know
Explanation:
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