Molecular formula for ammonia is
NH3... Structural formula for ammonia is see the pic. 107.3°
is the bond angle between H-N-H. A pair of dots above N are called lone pair of electrons and are responsible for the basicity of NH3.
Answer:
Charge on Moon and Earth is 5.43x10¹³ C .
Explanation:
Gravitational force is the force of attraction between any two bodies having mass while Electrostatic force is the force experienced by two charge bodies. Electrostatic force can be attractive or repulsive.
Let M and m be the mass of Earth and Moon respectively, d is the distance between Earth and Moon and q be the charge on Earth and -q be on the Moon.
Gravitational force, F₁ =![\frac{G\times{m}\times{M}}{d^{2} }](https://tex.z-dn.net/?f=%5Cfrac%7BG%5Ctimes%7Bm%7D%5Ctimes%7BM%7D%7D%7Bd%5E%7B2%7D%20%7D)
Here G is gravitational constant.
Electrostatic force, F₂ = ![\frac{k\times{q}\times{q}}{d^{2} }](https://tex.z-dn.net/?f=%5Cfrac%7Bk%5Ctimes%7Bq%7D%5Ctimes%7Bq%7D%7D%7Bd%5E%7B2%7D%20%7D)
Here k is Coulomb constant.
According to the problem, the gravitational force between Earth and Moon is equal to the electrostatic force between them.
F₁ = F₂
= ![\frac{k\times{q}\times{q}}{d^{2} }](https://tex.z-dn.net/?f=%5Cfrac%7Bk%5Ctimes%7Bq%7D%5Ctimes%7Bq%7D%7D%7Bd%5E%7B2%7D%20%7D)
= ![q^{2}](https://tex.z-dn.net/?f=q%5E%7B2%7D)
Put 6.07x10⁻¹¹ N m²/kg² for G, 5.97x10²⁴ kg for M, 7.34x10²² kg for m and 9x10⁹ N m²/C² in the above equation.
= q²
q = ![\sqrt{2.95\times{10^{27} }}](https://tex.z-dn.net/?f=%5Csqrt%7B2.95%5Ctimes%7B10%5E%7B27%7D%20%7D%7D)
q = 5.43x10¹³ C
Answer:
2) τ = F x torque increases, 3) troque decreases,
4) man approaches the pivot and the child must move away
5) Σ τ = 0
Explanation:
2) when the man moves away from the pivot his torque increases significantly, since his distance increases
τ = F x
τ = m g x
therefore the system rotates faster
3) when the child approaches the pivot, his troque decreases, because the distance decreases
τ = f x
therefore the system must spin slower
4) If we place the man and the child on the side of a scale, the movement must be the man approaches the pivot and the child must move away, so that the torque is the same and the system can reach a balance
5) the rotational equilibrium expression
Σ τ = 0
is the one that describes the equilibrium of a system with several forces
Answer: Microwaves
Explanation:
RADAR stands for radio detection and ranging. Radio waves range from 300 GHz to 30 Hz. Modern radar uses higher frequency of waves for detection. These waves are microwaves (300 MHz-300 GHz). Microwaves are types of radio waves and are used in the radar detection.
The electromagnetic wave which has highest frequency is gamma wave but it is not used for radar detection.
Hence, the correct answer is microwaves are the type pf radio waves which have the highest frequency and are used in radar detection.