What kind of gas cloud is most likely to give birth to stars? what kind of gas cloud is most likely to give birth to stars? a cold, dense gas cloud a hot, dense gas cloud a hot, low-density gas cloud a cold, low-density gas cloud?
Why does the total amount of energy before and after any energy transformations remain the same?
answer : Because energy cannot be created or destroyed, the total input is equal to the total output. The total amount of energy remains the same even though it may change forms.
Energy cannot be created nor be destroyed. But it can change from on from one form to the other. The total energy in a system always remains a constant.
What is conservation of energy?
According to the law of conservation of energy, energy can neither be created nor be destroyed. Therefore, the total energy of a system remains constant.
However, one form of energy can be converted to other form. There are different kinds of energy generating from different sources. Kinetic energy, potential energy, nuclear energy, gravitational energy, thermal energy, chemical energy, light energy etc. are different forms of energy.
In battery or cell the chemical energy is converted to electrical energy. Similarly in a solar cell light energy is converted to electrical energy. Whereas, in all electrical devices such as fan, motors, etc electrical energy is converted to the mechanical energy.
In this way the total energy of the system is always maintained on itself without any loss or gain in amount. Therefore, the total amount of energy before and after any energy transformations remain the same to balance the system.
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9. How does the length of the hypotenuse in a right triangle relate to the lengths of the legs? (2 points)
Open ended/Short answer question
Answer:
hypotenuse² = base² +height²
Explanation:
Let us suppose a right angled triangle having b as base, h as hypotenuse and p as perpendicular distance.
The relation between the length of legs, the base and the hypotenuse is called Pythagoras theorem. It is given by :
[tex]h^2=b^2+p^2[/tex]
or
hypotenuse² = base² +height²
Answer:
The relation between the length of the hypotenuse in a right triangle and lengths of the legs is [tex]H^{2} = p^{2}+b^{2}[/tex].
Explanation:
The legs of right angled triangle is also known as perpendicular and base respectively.
Let p be length of perpendicular and b be the length of base. Then by Pythagoras theorem,
[tex]H^{2} = p^{2}+b^{2}[/tex]
here, H is the length of Hypotaneous.
Thus, relation between the length of the hypotenuse in a right triangle and lengths of the legs is [tex]H^{2} = p^{2}+b^{2}[/tex].
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Two circuits have identical voltage sources. The only other elements in the circuits are resistors. The resistor in circuit A has a resistance that is four times as large as the resistance of the resistor in circuit B (RA = 4RB ). Which statement below best describes the current flowing through the two circuits? (Ohm's law: V = IR) A. The current flowing through circuit A is as large as the current flowing through circuit B. B. The current flowing through circuit A is 2 times as large as the current flowing through circuit B. C. The current flowing through circuit A is 4 times as large as the current flowing through circuit B. D. The current flowing through circuit A is as large as the current flowing through circuit B.
Final answer:
According to Ohm's law, since circuit A has a resistor four times larger than circuit B and both have identical voltage sources, the current in circuit A is one fourth as large as in circuit B.(Option D)
Explanation:
If two circuits have identical voltage sources and resistors and the resistance in circuit A is four times as large as the resistance in circuit B (RA = 4RB), we can apply Ohm's law (V = IR) to determine the relationship between the currents in each circuit. Since the voltage (V) across both circuits is the same, and the resistance (R) is four times higher in circuit A compared to circuit B, the current in circuit A will be four times smaller than the current in circuit B. Ohm's law rearranged to solve for current (I) is I = V/R.
Therefore, with a higher resistance in circuit A, the current is inversely proportional to the resistance. Hence, the correct statement is:
The current flowing through circuit A is one fourth as large as the current flowing through circuit B (Option D).
An automobile engine delivers 47.4 hp. how much time will it take for the engine to do 6.82 × 105 j of work? one horsepower is equal to 746 watts. answer in units of s.
Match the boundary with its characteristic
1. Convergent
2. Divergent
3. Transform
A. Along strike-slip faults
B. Along ocean ridges
C. Compression,
A certain instant camera determines the distance to the subject by sending out a sound wave and measuring the time needed for the wave echo to return to the camera. how long would it take the sound wave to return to the camera if the subject were 3.42 m away? the speed of sound is 343 m/s. answer in units of s.
The time it would take for the sound wave to travel to a subject 3.42m away and back, with a sound speed of 343 m/s, is approximately 0.01995 seconds.
Explanation:The time it takes for the sound wave to return to the camera can be found by applying the equation distance = speed * time. This principle is often utilized in technologies such as sonar and ultrasound imaging. Here the distance is doubled since the sound has to travel to the subject and back to the camera. If the subject is 3.42 m away, the total distance covered by the sound wave is 3.42m * 2 = 6.84m. Given that the speed of sound is 343 m/s, we can rearrange the equation to solve for time: time = distance/speed. Hence, time = 6.84m / 343 m/s = 0.01995 s, rounded to 5 decimal places.
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It takes 0.02 seconds for the sound wave to return to the camera if the subject were 3.42 metres away.
The given question can be solved by simple use of kinematic equations. It is given that the camera determines the distance to the subject by sending out a sound wave. The speed of the sound wave is v = 343 m/s
Now, for a subject at a distance of 3.42 metres away the sound wave has to travel to the subject and travel back to the camera as well. Therefore the total distance covered by the sound wave will be twice the distance of the subject from the camera.
d = 2 × 3.42 m = 6.84 m
From the kinematic equation;
[tex]v = \frac{d}{t}[/tex], where t = time taken
rearranging for t, we get:
[tex]t = \frac{d}{v}[/tex]
substituting the values,
[tex]t = \frac{6.84 m}{343 m/s}[/tex]
or, t = 0.019 s ≈ 0.02 s
Two point charges of equal magnitude are
7.5 cm apart. At the midpoint of the line
connecting them, their combined electric field
has magnitude of 45 N/C. Find the magnitude
of the charges.
Pls show me the complete calculation,
Which of the following best describes magnetic fields?
A. Magnetic fields need a conductor.
B. Magnetic fields are always found in insulators.
C. Magnetic fields have north and south magnetic poles.
D. Magnetic fields must have only positive charges.
Answer:
C
Explanation:
Because the north and the south pole are like the earth if they didn't attracted we would all die.
Magnetic fields have north and south magnetic poles. This statement best describes magnetic fields. So, option(C) is correct.
What is magnetic field?In the presence of a magnet, an electric current, or a shifting electric field, there is a vector field called a magnetic field where magnetic forces can be seen.
Electric charges in motion and the intrinsic magnetic moments of elementary particles connected to the fundamental quantum characteristic known as spin create a magnetic field.
As parts of the electromagnetic force, one of the four fundamental forces of nature, magnetic field and electric field are interdependent.
In magnetic field, there always be a north pole and a south pole because magnetic monopole doesn't exists. So, option (C) is correct.
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30 points please help a girl out!
A political action group that wants to overturn the Montreal Protocol monitors stratospheric ozone across the South Pole over a 10-year period. They compare changes in the ozone layer to increases in the average global temperature and find no correlation. Because of this, they claim that ozone layer depletion is a myth. What is the major flaw in their reasoning?
a. Global warming is not observable at the South Pole.
b. Only tropospheric ozone will correlate to global warming.
c. The loss of stratospheric ozone is not connected to global warming.
d. The effects of the Montreal Protocol will not be fully realized until 2050.
e. Ten years is too short a time period for meaningful data to be acquired.
Answer:
i think it's b
Explanation:
The group incorrectly assumes that ozone layer depletion is connected to global warming when they are separate issues. Ozone depletion is about the loss of stratospheric ozone that protects from ultraviolet radiation, while global warming concerns the greenhouse gas effect and climate change.
Explanation:The major flaw in the reasoning of the political action group that wants to overturn the Montreal Protocol is c. The loss of stratospheric ozone is not connected to global warming. There is a common misconception that ozone layer depletion and global warming are directly related, but they are in fact separate phenomena resulting from different processes in the atmosphere. The ozone layer, consisting of ozone (O3) molecules, is crucial for absorbing harmful ultraviolet radiation from the sun and thereby protecting living organisms. The Montreal Protocol aimed to reduce the production and release of industrial chemicals like chlorofluorocarbons (CFCs), which were proven to contribute to ozone depletion. While the protocol led to a significant reduction in CFCs and a gradual recovery of the ozone layer, this effort is different from initiatives like the Kyoto Protocol, which address greenhouse gas emissions and aim to mitigate global warming.
Which activity involves using fossil fuels directly or indirectly? 1)eating fresh fruit for a snack 2)cooking hot dogs on a campfire 3)using crayons to color 4)walking to school
Two vectors A and B have precisely equal magnitudes. In order for the magnitude of A+ B to be 110 times larger than the magnitude of A-B , what must be the angle between them?,
Due to the magnitudes, as mentioned in the problem, being equal, B has components Acos(θ)x along the x-axis and Asin(θ) along the y-axis.
The solution is as follows:
A+B has:
total x-component = A + Acos(θ) = A(1+cos(θ))
total y-component = 0 + Asin(θ) = Asin(θ)
Resultant = √[( A(1+cos(θ)))² + (Asin(θ))²]
= A√[1 + 2cos(θ) + cos²(θ) + sin²(θ)]
=A√[2 + 2cos(θ)]
A-B has:
total x-component = A - Acos(θ) = A(1-cos(θ))
total y-component = 0 - Asin(θ) = -Asin(θ)
Resultant = √[( A(1-cos(θ)))² + (-Asin(θ))²]
= A√[1 - 2cos(θ) + cos²(θ) + sin²(θ)]
=A√[2 - 2cos(θ)]
A+B/A-B = [A√[2 + 2cos(θ)]] / A√[2 - 2cos(θ)]
= [√[2 + 2cos(θ)]] / [√[2 - 2cos(θ)]]
110 = [√[1 + cos(θ)]] / [√[1 - cos(θ)]]
12100 = [1 + cos(θ)] / [1 - cos(θ)]
12100 - 12100cos(θ) = 1 + cos(θ)
12101cos(θ)] = 12099
cos(θ)= 0.999834724
θ = 1.04º
What’s the units of specific heat
Final answer:
The units of specific heat, which indicate the amount of energy needed to raise the temperature of 1 g of a substance by 1°C, are joules per kilogram Kelvin (J/(kg·K)) or joules per kilogram degree Celsius (J/(kg·°C)) in the SI system, and calories (cal) in non-SI units.
Explanation:
The units of specific heat are an important aspect in understanding how much energy is required to change the temperature of a substance. The specific heat of a substance is the amount of energy needed to increase the temperature of 1 gram of the substance by 1°C. In the International System of Units (SI), the unit of specific heat is joules per kilogram Kelvin (J/(kg·K)) or joules per kilogram degree Celsius (J/(kg·°C)). Additionally, the non-SI unit called the calorie (cal) is sometimes used, where 1 calorie is the energy required to raise the temperature of 1 gram of water by 1°C.
It's important to note that the value of specific heat remains the same whether measured in J/(kg·K) or J/(kg·°C), since the temperature change is the same whether expressed in Kelvin or degrees Celsius. For practical and historical reasons, other units like the calorie and the kilocalorie (kcal) are also used, particularly in contexts like food energy where 'calories' commonly refer to kilocalories.
A climate which changes with altitude is called a(n) climate.
Many of our behaviors are adopted as a product of our _____.
A TV shows
B radio
C environment
D friends
a bicyclist in the Tour De France crests a mountain pass as he moves at 15km/h. At the bottom 4km/h farther, his speed is 75km/h. What is his average acceleration(m/s^2) while riding down the mountain?,
What is the mass of a rock that weighs 49 newtons?
The mass of the rock is equal to 5 Kg when its weight is 49 N.
What is the weight of the object?The weight of a body can be described as the force acting on the body due to gravity. Weight can be described as a vector parameter if gravity is acting on the object.
The S.I. unit for measurement weight is of force, which S.I. is the newton (N). A body with a mass of 1 kg has a weight of about 9.8 Newton on the surface of the Earth, and about 1/6 as much on the Moon.
The mathematical expression to find the weight of an object is written as follows:
W = mg
Given the weight of the rock, W = 49 N
The acceleration due to gravity on the rock, g = 9.8 m/s²
The mass of the rock on the earth will be equal to:
49 = m × 9.8 m/s²
m = 5 kg
Therefore, the mass of the rock is equal to 5 kg.
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About how often does a 1-kilometer object strike the earth? about how often does a 1-kilometer object strike the earth? every year every million years every billion years
on the surface of planet x a body with a mass of 10 kilograms weighs 40 newtons. The magnitude of the acceleration due to gravity on the surface of planet X is
The cube has a mass of 72.9 g. What substance is this cube composed of?
On a fishing trip, Rebecca catches a fish that she has never seen before. What characteristics should she look at to determine which of the three main groups of fish her catch belongs to? What would she find if the fish is a bony fish?
Force = mass x acceleration
What force would be required to accelerate a 40 kg mass by 4 m/s2?
160
160 N
10 N
10
A 33.0 g iron rod, initially at 22.7 ∘c, is submerged into an unknown mass of water at 63.3 ∘c, in an insulated container. the final temperature of the mixture upon reaching thermal equilibrium is 58.5 ∘c. part a what is the mass of the water? express your answer to two significant figures and include the appropriate units.
What are some possible sources of error when using the modified mercalli scale to locate the epicenter of an earthquake?
The Modified Mercalli scale is used measures the amount of damage done during an earthquake. This helps to locate the epicenter of the earthquake. It depicts the intensity of the earthquake based on the damage occurred due to the earthquake. The responses from many people who experienced the earthquake are collected by the scientists, assigned a value and plotted on a map
The plotted number can change with the reference place within the region of disturbance. It depends on the location of the observer with reference to the epicenter of the earthquake. The reporting depends on the witness. Some can exaggerate the extent of damage caused. All the above mentioned are possible sources of error when using the Modified Mercalli scale to locate the earthquake's epicenter.
A piano tuner stretches a steel piano wire with a tension of 1000 n. the wire is 0.5 m long and has a mass of 5 g. what is the number of the highest harmonic that could be recorded by a computer that is capable of sensing frequencies up to 10,000 hz
Answer: 1. B) 720 N
2. D) 2500 m
3. D) 408 Hz
4. C) 4m
5. A) 246 hz
6. D) 31st
7. B) the frequency of the sound is 100 Hz
8. C) 0.78 m
9. B) 16 Hz
10. B) 311 m/s
You and friend run up a fight of stairs that is 30 m high. Both of you reach the top in 12 seconds. Your weight is 570 N and your friend weights 620 N. Which of you has more power? Show all work
What is the strength of an electric field that will balance the weight of a 8.2 g plastic sphere that has been charged to -3.3 nC? Answer in N/C.
Approach: I know that the forces need to balance out, and that F=mg (mass*gravity) and that F=q*E (charge* electric field).
mg=qE
E=mg/q
Plugging in the numbers:
m = 8.2*10^-3 kg
q = -3.3*10^-9 C
g = 9.8*10^-3 N/g
And I get -24351.5152, but it's wrong. I know there is some error with the units, could someone show me what I am doing wrong?
Which part of the carbon cycle is leading to coral bleaching? photosynthesis in plants respiration in plants absorption of carbon dioxide into the oceans
Answer: Option C
Explanation: The carbon dioxide is major green house gas that traps heat. But due to global warming the amount of carbon dioxide in the environment is increasing day by day.
The carbon dioxide gets in the ocean water and harms the organisms present in the ocean water. The coral present inside the water covers a very large area and is a major part of the marine ecosystem.
The carbon dioxide in excess leads to coral bleaching. This is a phenomenon in which the algae that is found inside the coral leaves the coral due to stress condition.
Thus, carbon dioxide in water increase the acidification in ocean which leads to coral bleaching.
A certain radio wave has a frequency of 2.0 x 10^6 Hz. What is its wavelength?
Can someone help me solve this??
An element's atomic number is 16. How many electrons would an atom of this element have?