Answer:
They take a little bit to adjust to the light.
Explanation:
Because being in the dark cinema for so long, out eyes had gotten used to it being that dark while watching the movie. When we leave or go outside from it, it is a lot brighter out and our eyes arent adjusted.
Questions #7 and 8:
Part 1 of 2: An ideal gas, initially at a volume of 6.22222 L and pressure of 9 kPa, undergoes isothermal expansion until its volume is 8 L and its pressure is 7 kPa. Calculate the work done by the gas during this process. Answer in units of J.
Part 2 of 2: Find the heat added to the gas during this process. Answer in units of J.
(a) The work done by the ideal gas during the isothermal exapnsion process is -3.556 J.
(b) The heat added to the gas during this process is 3.556 J.
Work done by the ideal gas
The work done by an ideal gas in isothermal expansion is change in pressure and volume of the gas. The change in the internal energy of the gas is zero.
The work done by the given ideal gas is calculated as follows;
W = ΔPV
where;
ΔP is change in pressure of the gasΔV is change in volume of the gasW = (P₂ - P₁)(V₂ - V₁)
W = (7kPa - 9kPa)(8L - 6.222L)
W = -3.556 kPa.L
1 kPa.L = 1 J
W = -3.556 J
Heat added to the processΔU = q + w
where;
ΔU is change in internal energy = 00 = q + (-3.556)
q = 3.556 J
Learn more about isothermal expansion here: https://brainly.com/question/15447045
use convention factors to convert
20kHz to Hz
Answer:
20kHz = 20000Hz
Explanation:
The frequency in hertz (Hz) is equal to the frequency in kilohertz (kHz) times 1000
If a bullet of mass 50 gm is moving with the velocity of 720 km/hr. Calculate its kinetic energy. Ans: here, mass (m)= 50 gm = 50/1000 kg = 0.05 kg velocity (v) = 720 km/hr= 720×1000/60×60=200m/s kinetic energy = ? We know, K.E.= 1/2 mv^2 = 1/2 × 0.05×(200)^2 = 0.05×40000/2 = 1000j ans. Is it correct???????
Answer:
yes 1000 j as I posted on the same Q elsewhere
Explanation:
The photograph shows a kettle made of the element copper. Which statement describes a chemical property of copper?
A. Copper forms a patina when it interacts with air.
B. Copper is a solid at room temperature.
C. Copper is a good conductor of electric current.
D. Copper can be re-shaped when hit with a hammer.
Which is an example of measurement that considers velocity? A the size of a standard basketball B the speed of baseball pitch C the placement of players on a field D the study of how records get broken
Answer: B, the speed of baseball pitch
Explanation:
The speed of a baseball pitch is an example of a measurement that considers velocity, therefore the correct answer is option B.
What is speed?The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object. The unit of speed is a meter/second.
average speed = total distance /Total time
The speed of the baseball pitch is an example of the measurement of velocity.
The size of a standard basketball is an example of the measurement of length.
similarly, option C and option d are unrelated to the measurement of the velocity.
The correct response is option B since a baseball pitch's speed is an example of a measurement that takes velocity into account.
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Without using a micrometer screw gauge, how do I find the average diameter of a long piece of thin wire using a metre rule and a uniform glass rod?
Answer:
Wind the long piece of thin wire around the uniform glass rod multiple times, find the length of the total diameters using the metre ruler, and divide by the number of times you wound it around the rod.
Explanation:
Since the diameter of one long piece of thin wire is too thin to be measured by a metre ruler, you can wind it multiple times and push it side by side to get a length you can measure.
For example, if you wound it around 20 times and the total length of 20 diameters of the wire side-by-side is 2.0 cm, one winding, which is the diameter would be 2.0cm ÷ 20 = 0.10cm or 1mm.
A particle moves in the xy plane in a circle centered on the origin. at a certain instant the velocity and acceleration of the particle are 6. 0 m/s and (3. 0 + 4. 0) m/s2. what are the x and y coordinates of the particle at this moment?
The x and y coordinates of the particle at this moment is (6x + 4.5y) m.
Position of the particleThe position of the particle at any instant is determined from the velocity and acceleration of the particle as shown below.
v² = u² + 2as
where;
v is the final velocity of the particleu is the initial velocitya is the acceleration of the particles is the position of the particlev² = 0 + 2as
v² = 2as
s = v²/2a
X and y - coordinates of the particle[tex]s_x = \frac{v^2}{2a_x} = \frac{6^2}{2(3)} = 6\ m\\\\s_y = \frac{v^2}{2a_y} = \frac{6^2}{2(4)} = 4.5 \ m\\\\s = (6 x \ + 4.5y)m[/tex]
Thus, the x and y coordinates of the particle at this moment is (6x + 4.5y) m.
Learn more about position of a particle here: https://brainly.com/question/2560794
Why do the wavelengths of the absorption and emission lines match?.
a 65 kg climber on top of Mount Everest (8800 m high). what is the gravitational potential energy?
Answer:
He has 5,609,404 J of potential energy
Explanation:
P.E. = M*G*H
65 * 9.8^2 * 8800
The potential energy of the climber whos weight is 65 kg at a height of 8800 m is 5.6 × 10⁶ Joules.
What is Potential energy?The potential energy of a body is defined as that generated by virtue of its position which is the form of energy stored in an object when it is at rest. When a body stops its motion, its kinetic energy is converted into potential energy.
Potential energy is related to the mass 'm' and height 'h' of the object from the ground and the acceleration due to gravity g is expressed as:
PE = m g h.
For above given information, mass of the climber = 65 Kg
Height of the mountain = 8800 m
g = 9.8 m/s²
Thus, PE = 65 kg × 8800 m × 9.8 m/s² = 5.6 × 10⁶ Joules.
Thus, the potential energy of the climber will be 5.6 × 10⁶ Joules.
Learn more about Potential energy, here:
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Help!!
Hurry!!!?!?!?
I don't know!!!!!
Answer:
KE = 1/2 M V^2 = 35 kg / 2 * (10 m/s)^2
KE = 17.5 * 100 kg m^2 / s^2 = 1,750 Joules
(B) is the correct answer
What are some downsides to fossil fuels? (Select all that apply.)
They release large amounts of carbon dioxide when burned.
They are in a limited supply.
They are expensive to extract compared to other forms of energy.
They do not replenish themselves.
Answer:
They release large amounts of carbon dioxide when burned.
They are expensive to extract compared to other forms of energy.
They do not replenish themselves
Explanation:
A hiker, weighing 560 newtons, takes 140 seconds to walk to the top of a hill with a height of 60 meters. How much power does the hiker develop?
A. 240 W
B. 1300 W
C. 2400 W
D. 78,000 W
Answer:
A -- 240
Explanation:
It takes around 270 to cycle more newtons up a hill
How to prepare for physics ATP exam o'levels?
Spend time on this subject. Physics may have some concepts which are difficult for students to understand in some cases. A key example is electricity and magnetism. Spend extra time on topics you find difficult and most of all, remember to do PAST PAPERS. These will be your light in the dark, your teachers, your friends. Continue to do them, and remember to leave one unsolved before your examinations. This will orient your mind for the examination and let you achieve the maximum marks possible.
About how long does light take to cross the milky way galaxy?.
Answer:
100,000 to 200,000 years to cross the milky way.
Explanation:
Under what circumstances can differentiation occur in a planet?.
conventionally anti clock wise torque is taken as?
Answer:
An anti-clockwise movement is taken as a positive and a clockwise moment is taken as a negative.
give any 2 evidence of the unsual expansion of water
Answer:
The anomalous expansion of water is an abnormal property of water whereby it expands instead of contracting when the temperature goes from 4o C to 0o C, and it becomes less dense.
Explanation:
The density is maximum at 4 degree centigrade and decreases below that temperature as shown in graph.
An ideal single movable pulley requires an input force that is one-half the ouput force.
True False
where are metamorphic rocks formed? And how are they formed
6th Grade Earth science
Answer:
Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors. Conditions like these are found deep within the Earth or where tectonic plates meet.
what does goin to get da milk mean
Answer:
going to get the milk
Explanation:
mark me as brainiest
During which month will the pointer stars of the Big Dipper point directly upward, away from the horizon?
Pls helppp
Answer:
April
Explanation:
You need to move a large refrigerator. It has a mass of 300 kg. You want to accelerate it at a rate of 3 m/s/s. What force must you apply?
Answer:
900 N
Explanation:
F = ma
= 300 (3) = 900 N
why do we see optical illusion?
Optical illusions occur because our brain is trying to interpret what we see and make sense of the world around us. Optical illusions simply trick our brains into seeing things which may or may not be real.
A sample of helium behaves as an ideal gas as it is heated at constant pressure from 273 K to 388 K. If 80 J of work is done by the gas during this process, what is the mass of the helium sample? The universal gas constant is 8.31451 J/mol · K. Answer in units of g
The mass of the helium gas sample after the work is done by the gas during the process is 0.099 g.
Number of moles of the helium gasThe number of moles of the helium gas is calculated as follows;
W = nRT
where;
n is the number of molesW is the work doneR is universal gas constant = 8.31451 J/mol · KT is the final temperature = 388 K273 K = 0⁰C and 388 K = 115⁰ C
from 0⁰C to 115⁰C = 115 - 0 = 115⁰ C
115⁰ C = 388 K
The number of moles is calculated as follows;
n = W/RT
[tex]n = \frac{80}{8.315 \times 388} \\\\n = 0.0248 \ mol[/tex].
Mass of the helium sampleMass of the helium sample is calculated as follows;
m = Mn
where;
M is the molar mass of helium gas = 4 g/molm = 4 g/mol x 0.0248 mol
m = 0.099 g
Thus, the mass of the helium gas sample after the work is done by the gas during the process is 0.099 g.
Learn more about helium gas here: https://brainly.com/question/3094665
Use the passage to answer the question.
Light can be passed through two slits and projected onto a screen. The light from the two light sources produces a pattern of dark and light spots on the screen. The spots can be the result of interference, which happens with waves but not particles. This shows that the wave explanation is best for explaining the spots.
What is the reasoning in this passage?
(1 point)
Light can be passed through two slits and projected onto a screen.
The light from the two light sources produces a pattern of dark and light spots on the screen.
The spots are the result of interference, which happens with waves but not particles.
This shows that the wave particle is best for explaining the spots.
The reasoning in the passage is : ( C ) The spots are the result of interference, which happens with waves but not particles
Light wavesLight passed through a slit and projected onto a screen will form a pattern which is very visible and the pattern might have dark spots if there is some form of interference. Interference is present in waves and not particles.
Hence we can conclude that the reasoning in the passage is The spots are the result of interference, which happens with waves but not particles
Learn more about light waves : https://brainly.com/question/25847009
how can magnets cause objects to have kinetic energy?
please help asap
1. What is the approximate age of the fossil described in the activity?
1.8 million years
18 million years
.9 million years
90 million years
Answer:
B.
Explanation:
It should be B. 18 million years ago.
I apologize if it is incorrect-
I hope it helps! Have a great day!
Anygays-
Answer:
B. 18 million years
Explanation:
The answer is B. 18 million years
I hope it helps! Have a great day!
Muffin ^^
What is the frequency of a wave that has a period of 5 seconds
Answer:
0.20 Hz
Explanation:
Frequency is the reciprocal of the period. The period is 5 seconds, so the frequency is 1/(5 s) = 0.20 Hz.
The electromagnetic spectrum is the complete range of electromagnetic radiation ranging from radio waves to gamma rays. Which type of radiation in this spectrum is associated with observable colors such as red, green, and blue?.
5. The amount of energy provided by a battery in a circuit is
the amount of energy consumed in the circuit.
A. Equal to
B. Less than
C. Greater than
D. Not related to
