I'm assuming that's a typo, and the rock station is at 107.1 MHz .
The lower frequency radio waves, emanating from the opera
station, are longer.
Each photon of radiation with higher frequency, emanating from
the rock station, has more energy. But the total energy radiating
from each station depends on the power level of their transmitter,
not on their frequency.
Answer:
Metals conduct heat and reduce the kinetic energy within the components that need to remain cool
Answer:
visual basics
Explanation:
not suited for programming, slower than the other languages. hard to translate to other operating systems
Answer: v2 = -50.8m/s
Therefore, the speed of the baseball is 50.8m/s away from the bat. (Reverse direction)
Explanation:
Using the law of conservation of momentum:
The impulse of the bat = change in momentum of the baseball
Ft = ∆M
Ft = m1v1 - m2v2
Since m1 = m2 = m (the mass remains unchanged)
Ft = m(v1 - v2) .....1
Given:
Force F = 8900N
Mass m = 0.145kg
time t = 1.3 × 10^-3 s
Initial velocity v1 = 29m/s
Substituting into eqn 1
8900(1.3×10^-3) = 0.145(29-v2)
29-v2 = 79.79
v2 = 29 - 79.79 = -50.8m/s
v2 = -50.8m/s
Therefore, the speed of the baseball is 50.8m/s away from the bat.
Answer:
![4.32\cdot 10^5 J](https://tex.z-dn.net/?f=4.32%5Ccdot%2010%5E5%20J)
Explanation:
Power is related to energy by the following relationship:
![P=\frac{E}{t}](https://tex.z-dn.net/?f=P%3D%5Cfrac%7BE%7D%7Bt%7D)
where
P is the power used
E is the energy used
t is the time elapsed
In this problem, we know that
- the power of the fan is P = 120 W
- the fan has been running for one hour, which corresponds to a time of
![t = 1 h \cdot (60 min/h)(60 s/min)=3600 s](https://tex.z-dn.net/?f=t%20%3D%201%20h%20%5Ccdot%20%2860%20min%2Fh%29%2860%20s%2Fmin%29%3D3600%20s)
So we can re-arrange the previous equation to find E, the energy (in the form of thermal energy) released by the fan:
![E=Pt=(120 W)(3600 s)=4.32\cdot 10^5 J](https://tex.z-dn.net/?f=E%3DPt%3D%28120%20W%29%283600%20s%29%3D4.32%5Ccdot%2010%5E5%20J)