Answer: Scientists found evidence of Earths magnetic field reversal in rocks on the ocean floor at plate boundaries. These rocks have alternating polarity due to magnetization that occurred during their cooling period. Using radio metric dating, scientist estimate that reversals occur approximately every several hundred thousand years.
Explanation:
Combustion, also known as burning, is the basic chemical process of releasing energy from a fuel and air mixture. In an internal combustion engine (ICE), the ignition and combustion of the fuel occurs within the engine itself. The engine then partially converts the energy from the combustion to work.
Answer:B
Explanation:
Given
radius of Pulley is r
Pulley has a moment of inertia is I
Suppose mass is falling with an acceleration a and T be the Tension in string
And 
and Torque is 
Which is less than 
5.67 is the correct answer
That’s the correct answer on edg
Answer:
a) 282.8 m/s
b) 13812 revolutions
Explanation:
a) The aceleration(a) is the angular velocity(w) divide by the time. The disk had cosated for 12 s in a constant angular velocity, so it will be:
a = w/t
610 = w/12
w = 7230 rad/s
The angular velocity is related by the linear velocity:
V = w*r, where r is the radius of the circumference ( r = 0.08/2 = 0.04 m)
V = 7230*0.04 = 292.8 m/s
b) The number of revolutions is the frequency (f) of the moviment, which is related to the angular velocity as:
w = 2π*f
f = w/2π
f = 7230/6.28
f = 1151 revolutions/s
So, the total revolutions (n) is 12 s was:
n = 12*1151 = 13812 revolutions
