FEMA stands for <span>Federal Emergency Management Agency</span>
Answer:
True.
Explanation:
A more practical use of constellations was for agriculture. Before calendars were invented farmers relied on the stars to determine when to sow and harvest their crops. Constellations made the patterns of the stars easy to remember. ... Constellations allowed farmers to plan ahead.
Answer:
8.4 m/s
Explanation:
The toy completes 10 circle in 30 seconds. So its frequency of revolution is
![f=\frac{10}{30 s}=0.33 Hz](https://tex.z-dn.net/?f=f%3D%5Cfrac%7B10%7D%7B30%20s%7D%3D0.33%20Hz)
The periof of revolution is the reciprocal of the frequency, so
![T=\frac{1}{f}=\frac{1}{0.33 Hz}=3 s](https://tex.z-dn.net/?f=T%3D%5Cfrac%7B1%7D%7Bf%7D%3D%5Cfrac%7B1%7D%7B0.33%20Hz%7D%3D3%20s)
The radius of the circular path is
r = 4.0 m
So the total distance covered by the toy in one circle is the length of the circumference:
![2\pi r](https://tex.z-dn.net/?f=2%5Cpi%20r)
And so the average speed is
![v=\frac{2\pi r}{T}=\frac{2\pi (4.0 m)}{3 s}=8.4 m/s](https://tex.z-dn.net/?f=v%3D%5Cfrac%7B2%5Cpi%20r%7D%7BT%7D%3D%5Cfrac%7B2%5Cpi%20%284.0%20m%29%7D%7B3%20s%7D%3D8.4%20m%2Fs)
Answer:
Explanation:
There is electric field between the plates whose value is given by the following expression
electric field E = V /d where V is potential between the plates and d is distance between them
E = 300 / 5 x 10⁻³
= 60 x 10³ N/c
Force on electron = q E where q is charge on the electron
F = 1.6 X 10⁻¹⁹ X 60 X 10³ = 96 X 10⁻¹⁶ N.
Acceleration a = force / mass
a = 96 x 10⁻¹⁶/ mass = 96 x 10⁻¹⁶ / 9.1 x 10⁻³¹
= 10.55 x 10¹⁵ m / s²
For midway , distance travelled
s = 2.5 x 10⁻³ m
s = 1\2 a t²
t = ![\sqrt{\frac{2s}{a\\ } }](https://tex.z-dn.net/?f=%5Csqrt%7B%5Cfrac%7B2s%7D%7Ba%5C%5C%20%7D%20%7D)
= ![\sqrt{\frac{2\times2.5\times10^{-3}}{ 10.55\times10^{15}}](https://tex.z-dn.net/?f=%5Csqrt%7B%5Cfrac%7B2%5Ctimes2.5%5Ctimes10%5E%7B-3%7D%7D%7B%2010.55%5Ctimes10%5E%7B15%7D%7D)
t = .474 x 10⁻¹⁸ s
For striking the plate time is calculated as follows
t =
[/tex]
t = 0.67 x 10⁻¹⁸ s
Answer:
it was given the name Newton (N). from this, the derived unit of energy (or work) is defined ,as the work produced when the unit of force causes a displacement equal to the unit of length of its point of application along its direction . It was given the name Joule (J).
Explanation: