Answer:
A, B, D.
Explanation:
If Jamy pushes on Anita, then by Newton's 3rd Law there will be a reaction force equal in magnitude and opposite in direction. This means that A and D are correct, while C, E, F and G are incorrect. Since the magnitude of any of these forces can be calculated with Newton's 2nd Law, F=ma for either Jamy or Anita, this means that B is correct.
Answer:
Wavelength = 3.74 m
Explanation:
In order to find wavelength in "metres", we must first convert megahertz to hertz.
1 MHz = 1 × 10⁶ Hz
80.3 Mhz = <em>x</em>
<em>x </em>= 80.3 × 1 × 10⁶ = 8.03 × 10⁷ Hz
The formula between wave speed, frequency and wavelength is:
v = fλ [where v is wave speed, f is frequency and λ is wavelength]
Reorganise the equation and make λ the subject.
λ = v ÷ f
λ = (3 × 10⁸) ÷ (8.03 × 10⁷)
λ = 3.74 m [rounded to 3 significant figures]
(1×10^-5)/(1.6×10^-19)= 6.25×10^13 electrons(ans)
Notice that the charge of a sphere is very larger than charge of electron obviously, so each electron on the sphere is made of 1.6×10^-19 charge, so you found how many of these charges are required for you to make a charge of 1×10^-5
for Example: your electron has charge 2 on it
and the sphere has charge 200 on it, then the number of electrons that make up that charge will be
200/2 = 100 electrons.
Answer:
the answer is Transitional metals
Explanation:
they are hard and have a high density