<em>The y-intercept of a position-time graph of an object gives the average velocity of the object is False.</em>
<u>Answer:</u> <em>False.
</em>
<u>Explanation:</u>
The initial position of the object can be obtained by calculating the Y intercept of a position-time graph. In a position-time graph, the independent variable is time and dependent variable is position. Y axis is the position axis and x axis is the time axis.
The equation of the graph is given by
. m is the slope of the graph and c is the y intercept. When a particle starts from the origin its y intercept is zero.
The nature of the graph gives us an idea about velocity. When the velocity is positive, the position- time graph has positive slope and when the velocity is positive the graph has negative slope.
Explanation:
It is known that wave intensity is the power to area ratio.
Mathematically, I = ![\frac{P}{A}](https://tex.z-dn.net/?f=%5Cfrac%7BP%7D%7BA%7D)
As it is given that power is 28.0 W and area is
.
Therefore, sound intensity will be calculated as follows.
I = ![\frac{P}{A}](https://tex.z-dn.net/?f=%5Cfrac%7BP%7D%7BA%7D)
= ![\frac{28.0 W}{4 \times 3.14 \times 7 \times 10^{-5} m^{2}}](https://tex.z-dn.net/?f=%5Cfrac%7B28.0%20W%7D%7B4%20%5Ctimes%203.14%20%5Ctimes%207%20%5Ctimes%2010%5E%7B-5%7D%20m%5E%7B2%7D%7D)
= ![0.318 \times 10^{5} W/m^{2}](https://tex.z-dn.net/?f=0.318%20%5Ctimes%2010%5E%7B5%7D%20W%2Fm%5E%7B2%7D)
or, = ![3.18 \times 10^{4} W/m^{2}](https://tex.z-dn.net/?f=3.18%20%5Ctimes%2010%5E%7B4%7D%20W%2Fm%5E%7B2%7D)
Thus, we can conclude that sound intensity at the position of the microphone is
.
Answer:
The following components shall be used in given order:
1. Step Down Transformer 2. Diode as Rectifier 3. Capacitor
Explanation:
The following components shall be used in given order:
1. Step Down Transformer 2. Diode as Rectifier 3. Capacitor
1.<u>STEP DOWN TRANSFORMER</u>:
The step down transformer is first used to convert the 120 V AC signal into 12 V AC signal. Because the output required is of 12 V.
2.<u>DIODE AS RECTIFIER</u>:
Now, the PN Junction diode is used as a rectifier to convert the 12 V AC signal to 12 V DC signal.
3.<u>CAPACITOR</u>:
Now, the output is in waveforms. So, in order to linearize it in the form of DC current, we use capacitor. The main function of capacitor is to smoothen the signal into a straight line.
Use the Formula PE=mgh to solve for height.
Answer: The minimum kinetic energy Kmin is 1.3 × 10^-13 J
Explanation: Please see the attachments below