Answer:
Explanation:
work done by gravitational force during fall of distance d = mgd
work done by drag = w ( let )
mgd - w = 1/2 m v²
w = m g d - 1/2 m v²
so work done by drag force
= m g d - 1/2 m v²
b ) when terminal velocity is reached , drag force = mg
power supplied by drag force = force x velocity
= mg x v
P_d = mgv
Subductions occur at convergent boundaries. Its where one tectonic plate moves under another.
-Steel jelly
Answer:
3. relatively high temperature, about 10,000 K, so that significant numbers of electrons are excited from the ground state, n = 1, to the first excited state, n = 2, but not too many of them have been ejected completely from the atoms
Explanation:
If hydrogen absorption lines are very strong in the visible spectrum of a particular star that means the population of electron in n = 2 is very high so on being exited they absorb radiation in Balmer series and give rise to absorption spectrum. The average temperature required to excite electron in hydrogen atom from n=1 to n = 2 is 10000K .
Answer:
The no of revolutions rotor turn before coming to rest is 1,601.1943 and time taken is equal to 19.21 seconds
Explanation:
here we know that torque = I×α
α= angular acceleration
I = moment of inertia of hollow disc = m×
given that m=4.37kg
k=0.0710m
torque=1.2Nm
from the above equation we can calculate the angular acceleration of the hollow disc .
since 
from this above equation 
no of revolutions = 
= 1,601.1943.
Now to calculate time we know that time = 
so upon calculating we will be getting t=19.21 seconds
Many ways for example they look up related things and study them or they can test it and see what happens
