The force of friction between the pavement and the tires
Answer:
Microwave takes 13.67μs to travel from cell phone to tower
Explanation:
Given data:
Distance traveled by microwave from cell phone to tower = ![\frac{4100 m}{3 x 10^{8} m/s}](https://tex.z-dn.net/?f=%5Cfrac%7B4100%20m%7D%7B3%20x%2010%5E%7B8%7D%20m%2Fs%7D)
We know that the microwave is an electromagnetic wave and the velocity v of electromagnetic wave is 3 x
m/s.
In general, to determine time of travel from distance and velocity given, we divide distance traveled by velocity. That is
Velocity = ![\frac{distance}{time}](https://tex.z-dn.net/?f=%5Cfrac%7Bdistance%7D%7Btime%7D)
Hence, time = ![\frac{distance}{velocity}](https://tex.z-dn.net/?f=%5Cfrac%7Bdistance%7D%7Bvelocity%7D)
Therefore, time of travel of microwave = ![\frac{4100 m}{3 x 10^{8} m/s }](https://tex.z-dn.net/?f=%5Cfrac%7B4100%20m%7D%7B3%20x%2010%5E%7B8%7D%20m%2Fs%20%7D)
= ![\frac{4100 m}{300 x 10^{6} m/s }](https://tex.z-dn.net/?f=%5Cfrac%7B4100%20m%7D%7B300%20x%2010%5E%7B6%7D%20m%2Fs%20%7D)
= 13.67 x
s
= 13.67 μs (μs is microseconds)
Hence microwave takes 13.67μs to travel from cell phone to tower.
Distance can be equal to displacement ... if the motion is all in a straight line ... but distance can never be greater than displacement.
Answer:
![m=454.73 kg](https://tex.z-dn.net/?f=m%3D454.73%20kg)
Explanation:
To convert the energy of the cereal to know the weight:
![m*g*h=Q'](https://tex.z-dn.net/?f=m%2Ag%2Ah%3DQ%27)
![Cal=0.0179*113 Cal=2.0227Cal](https://tex.z-dn.net/?f=Cal%3D0.0179%2A113%20Cal%3D2.0227Cal)
![Q'=2.0227Cal*\frac{4186J}{1Cal}](https://tex.z-dn.net/?f=Q%27%3D2.0227Cal%2A%5Cfrac%7B4186J%7D%7B1Cal%7D)
![m*g*h=8467.02J](https://tex.z-dn.net/?f=m%2Ag%2Ah%3D8467.02J)
![m*g=\frac{Q'}{h}=\frac{8467.02J}{1.90m}](https://tex.z-dn.net/?f=m%2Ag%3D%5Cfrac%7BQ%27%7D%7Bh%7D%3D%5Cfrac%7B8467.02J%7D%7B1.90m%7D)
![m*g=4456.33 N](https://tex.z-dn.net/?f=m%2Ag%3D4456.33%20N)
Supuse the gravity as a g=9.8m/s^2
![m=\frac{4456.33N}{9.8m/s^2}](https://tex.z-dn.net/?f=m%3D%5Cfrac%7B4456.33N%7D%7B9.8m%2Fs%5E2%7D)
![m=454.73 kg](https://tex.z-dn.net/?f=m%3D454.73%20kg)
2a) moment = 1.5P
2bi) 210*1 = 210Nm
2bii) 140N
2biii) 70 N