Answer:
Newton's law of cooling states that the rate of heat loss of a body is directly proportional to the difference in the temperatures between the body and its surroundings. The law is frequently qualified to include the condition that the temperature difference is small and the nature of heat transfer mechanism remains the same. As such, it is equivalent to a statement that the heat transfer coefficient, which mediates between heat losses and temperature differences, is a constant. This condition is generally met in heat conduction (where it is guaranteed by Fourier's law) as the thermal conductivity of most materials is only weakly dependent on temperature. In convective heat transfer, Newton's Law is followed for forced air or pumped fluid cooling, where the properties of the fluid do not vary strongly with temperature, but it is only approximately true for buoyancy-driven convection, where the velocity of the flow increases with temperature difference. Finally, in the case of heat transfer by thermal radiation, Newton's law of cooling holds only for very small temperature differences.
When stated in terms of temperature differences, Newton's law (with several further simplifying assumptions, such as a low Biot number and a temperature-independent heat capacity) results in a simple differential equation expressing temperature-difference as a function of time. The solution to that equation describes an exponential decrease of temperature-difference over time. This characteristic decay of the temperature-difference is also associated with Newton's law of cooling
Answer:c
Explanation:
it is given that Adam and Boby starts from same height so their total Energy at top is
Potential Energy of Adam
Potential Energy of boby
when they fall a height h their speed at bottom will be
which will be same for both Adam and Boby
Energy at bottom
Kinetic Energy of Adam
Kinetic Energy of boby
Since velocity is same therefore kinetic Energy is same for Adam and boby
thus option c is correct
Focuses light on the retina
The final speed of C is equal to that of B.
The travel time of A is less than that of B.
The final speed of B is equal to that of A.
The travel time of C is greater than that of B.
The final speed of A is equal to that of C.
The travel time of C is greater than that of A.
<h3>What is speed?</h3>
The speed of any moving object is the ratio of the distance covered and the time taken to cover that distance.
Consider the three inclines shown in the figure (attached below). The vertical line is an incline with a 90° angle. All three inclines are frictionless. Three small identical objects are released from the top of the inclines.
When the objects are at the same height, they travel with the same height. The travel time is directly proportional to the incline.
Thus, all the statements are completed.
Learn more about speed.
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Hey there mate ;)
Given PPT image question is attached.
For answers :-
☆ The spectators in the stand are like particles in a <em><u>solid</u></em><em> </em>because <em><u>the</u></em><em><u> </u></em><em><u>spectators</u></em><em><u> </u></em><em><u>are</u></em><em><u> </u></em><em><u>sitting</u></em><em><u> </u></em><em><u>very</u></em><em><u> </u></em><em><u>close</u></em><em><u> </u></em><em><u>to</u></em><em><u> </u></em><em><u>each</u></em><em><u> </u></em><em><u>other</u></em><em><u> </u></em><em><u>with</u></em><em><u> </u></em><em><u>no</u></em><em><u> </u></em><em><u>spaces</u></em><em><u> </u></em><em><u>in between</u></em><em><u> </u></em><em><u>them</u></em><em><u>,</u></em><em><u> </u></em><em><u>which</u></em><em><u> </u></em><em><u>is</u></em><em><u> </u></em><em><u>like</u></em><em><u> </u></em><em><u>a</u></em><em><u> </u></em><em><u>property</u></em><em><u> </u></em><em><u>in</u></em><em><u> </u></em><em><u>solids</u></em><em><u>. </u></em>
☆ The players in the pitch are like particles in a <em><u>gas</u></em><em> </em>because <em><u>there</u></em><em><u> </u></em><em><u>is</u></em><em><u> </u></em><em><u>a</u></em><em><u> </u></em><em><u>large</u></em><em><u> </u></em><em><u>amount</u></em><em><u> </u></em><em><u>if</u></em><em><u> </u></em><em><u>space</u></em><em><u> </u></em><em><u>in</u></em><em><u> </u></em><em><u>between</u></em><em><u> </u></em><em><u>the</u></em><em><u> </u></em><em><u>players</u></em><em><u>,</u></em><em><u> </u></em><em><u>which</u></em><em><u> </u></em><em><u>is</u></em><em><u> </u></em><em><u>like</u></em><em><u> </u></em><em><u>a</u></em><em><u> </u></em><em><u>property</u></em><em><u> </u></em><em><u>of</u></em><em><u> </u></em><em><u>gases</u></em><em><u>.</u></em>
☆ The spectators standing in the terraces are like particles in a <em><u>liquid</u></em> because <em><u>there is </u></em><em><u>little</u></em><em><u> space in between the spectators, which is like a property of liquid.</u></em>