One of the major effects of heat transfer is temperature change: heating increases the temperature while cooling decreases it. We assume that there is no phase change and that no work is done on or by the system. Experiments show that the transferred heat depends on three factors—the change in temperature, the mass of the system, and the substance and phase of the substance.
Figure a shows a copper-colored cylinder of mass m and temperature change delta T. The heat Q, shown as a wavy rightward horizontal arrow, is transferred to the cylinder from the left. To the right of this image is a similar image, except that the heat transferred Q prime is twice the heat Q. The temperature change of this second cylinder, which is also labeled m, is two delta T. This cylinder is surrounded by small black wavy lines radiating outward. Figure b shows the same two cylinders as in Figure a. The left cylinder is labeled m and delta T and has a wavy heat arrow pointing at it from the left that is labeled Q. The right cylinder is labeled two m and delta T and has a wavy heat arrow pointing to it from the left labeled Q prime equals two Q. Figure c shows the same copper cylinder of mass m and with temperature change delta T, with heat Q being transferred to it. To the right of this cylinder, Q prime equals ten point eight times Q is being transferred to another cylinder filled with water whose mass and change in temperature are the same as that of the copper cylinder.
(a) The angular speed of the rotation is 12.57 rad/s
(b) The period of the rotation is 0.5 s.
(c) The speed of the tip of your finger is 15.08 m/s.
<h3>
Angular speed of the rotation</h3>
The angular speed of the rotation is calculated as follows;
ω = 2πN
where;
- N is number of revolutions
ω = 2π x (2) = 4π = 12.57 rad/s
<h3>Period of rotation</h3>
<h3>Speed of your finger</h3>
v = ωr
v = 12.57 x 1.2
v = 15.08 m/s
Learn more about angular speed here: brainly.com/question/6860269
<span>The answer to your question: <span>The
sun emits shortwave radiation, but it is radiated back off of planetary bodies
as longwave radiation. </span></span>
<span>
Explanation: The sun emits shortwave
radiation, wherein it’s extremely hot and is filled with more energy compared
to the radiation emitted by planets. This also comes in the form of light. However, once this becomes absorbed by planetary bodies, it turns into longwave radiation. A good example is the earth’s atmosphere emitting energy
(longwave radiation), which is energy originally coming from the sun (shortwave radiation).</span>
Answer:
28 J
Explanation:
Mechanical energy is the sum of kinetic and potential energy in an object that is used to do work. In other words, it is energy in an object due to its motion or position, or both.
In physics, mechanical energy (Emech) is the energy associated with the motion and position of an object usually in some force field.
Therefore:
ME = KE + PE = 25 + 3 = 28 J
