Answer:
λ = 397 nm
Explanation:
given,
Rydberg wavelength equation for Balmer series

R is the Rydberg constant, R = 1.097 x 10⁷ m⁻¹
n_i = initial energy level
n_f = final energy level
where as for Balmer series n_f = 2
n_i = 7




Hence, the wavelength is equal to λ = 397 nm
Answer:
<em>Answer: B. 49 N</em>
Explanation:
<u>Friction Force
</u>
When an object is at rest on a rough surface, it encounters a friction force that opposes motion.
The friction force when an object is moving on a horizontal surface is calculated by:

Where
is the coefficient of static friction and N is the normal force.
If no forces other then the weight and the normal are acting upon the y-direction, then the weight and the normal are equal in magnitude:
N = W = m.g
Thus, the friction force is:
We are given the coefficient of static friction
and the mass of the object m=10 Kg. The minimum force needed to make it start moving is the maximum friction force:
Fr=0.5*10*9.8
Fr = 49 N
Answer: B. 49 N
Answer:
You build up kinetic energy and you get shocked this happens because static has built up from the socks and the rug. This also happens when you rub a balloon on your head or shuffle across a trampoline with socks on.
Explanation:
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