Who first arranged the elements according to atomic mass and noticed a periodic recurrence of their physical and chemical properties?A. Henry Moseley
B. Antoine Lavoisier
C. John Dalton
D. Dmitri Mendeleev
Answers
Related Questions
Under which conditions will the volume of a gas be greatest?A. T=300K and P=0.25 atmB. T=273K and P=0.25 atmC. T=300k and P=2 atmD. T=273K and P=2 atm
Flatworms can be cut in half, creating two new individuals, by _____.binary fissionmultiple fissionfragmentationbudding
A student measured the specific heat of water to be 4.29 J/g.Co. Theliterature value of the specific heat of water is 4.18 J/g.Co. What was thestudent's percent error? *A) .0256%B) 2.56%C) 2.63%D) .0263%
Polychlorinated biphenyls (PCBs) have been banned because they are an environmental hazard. Which of the following was NOT a reason for banning them?
concrete
wood
gold
Answers
The answer would be ~ Gold. All metals are good conductors. But some however may be slower than others. Gold is not that great of a conductor, but is the best choice on here.
Hope this helps!
~DL
Answers
Heat transfer is the flow of heat due to temperature difference.
The rate of increase in the energy content of the room is 1560 W.
What is heat transfer?
Heat transfer is the flow of heat due to temperature difference. The heat flow from higher temperature to the lower temperature.
Given information-
Initial temperature of the room is 20 degree Celsius.
The room contains a 40-W light bulb, a 110-W TV set, a 300-W refrigerator, and a 1110-W iron.
The rate of increase in the energy of the room is the difference of energy increasing in the room and the energy leaving to the room.
Thus the rate of increase
Energy inside the room is the sum of all the energies increasing as,
As there is no heat transfer through the walls. Thus the energy leaving to the room is,
Thus put the values in the first equation as,
Thus the rate of increase in the energy content of the room is 1560 W.
Learn more about the heat transfer here;
Final answer:
The rate of increase of the energy content of the room when all electric devices are on is 1560 W.
Explanation:
To determine the rate of increase of the energy content of the room, we need to calculate the total power consumption of the electric devices. Adding up the power ratings, we have:
Total power = 40 W + 110 W + 300 W + 1110 W = 1560 W
Therefore, the rate of increase of the energy content of the room when all of these electric devices are on is 1560 W.
Learn more about Power consumption here:
#SPJ3
a triple beam balance
a mass meter
all of the above
Answers
Answer;
-A triple beam balance
Explanation;
-Mass is the amount of matter in an object. Move to a different planet and an object's weight will change, but its mass will be the same. There are a couple of ways to measure mass. The Mass of an object doesn't change when an object's location changes. Weight, on the other hand does change with location.
-Mass is measured by using a balance comparing a known amount of matter to an unknown amount of matter. Weight is measured on a scale.
Mass is measured using scales, a triple beam balance, or a mass meter.
What are scales used for?
Scales are commonly used for everyday measurements, where an object's weight is indirectly measured by the force it exerts on a spring or load cell.
A triple beam balance is a type of mechanical balance that uses a combination of sliding weights to determine mass.
Read more about mass here:
#SPJ6
Answers
90 watts = 0.09 KW
Energy = (power) x (time) =
(0.09) x (24) KWh
Cost = (energy) x (unit price) =
(0.09 x 24) x ($0.51) = $1.10 per day (rounded)
(Those are very expensive kWh's.)
Answers
Final answer:
Gravity is present when a block hangs at rest from a piece of rope. The block remains in equilibrium, suspended by the tension in the rope which is equal and opposite to the gravitational force acting on the block.
Explanation:
In the scenario where a block hangs at rest from the ceiling by a piece of rope, gravity is indeed present. The force of gravity, often referred to as weight, acts downwards on the block. However, the block is not falling because there is an equal and opposite upward force - this is the tension in the rope. According to Newton's second law, the tension in the rope must be equal to the weight of the block for it to remain in equilibrium and not move. The tension in the rope and the gravitational force on the block are equal in magnitude but opposite in direction, which sums up to zero net force, hence the block is at rest.
Learn more about Physics of Gravity and Tension here:
#SPJ11
B. the first law of thermodynamics
C. the second and third laws of thermodynamics
D. the third law of thermodynamics
Answers
Answer:
D. the third law of thermodynamics
Explanation:
As per third law of thermodynamics we know that entropy of a perfect crystal comes to zero when the temperature of the crystal reaches to absolute zero.
So as per the theory of entropy we know that entropy of a system cannot be zero as it will reach zero then system will not exist.
So here we can say that
As per third law it is not possible to achieve zero kelvin or absolute zero temperature because at that temperature the entropy will become zero and then the system will not exist in that case.
So here we can say the correct answer will be
D. the third law of thermodynamics