Answer:
9.801 m/s²
Explanation:
t = Time taken
u = Initial velocity
v = Final velocity = 39 ft/s
s = Displacement = 720 cm = 7.2 m
a = Acceleration
Converting to m/s
Equation of motion
Acceleration of the ball is 9.801 m/s²
Without friction, NO.
The speed at D depends only on the difference in height between A and D. Whatever happens between them doesn't matter.
First, you need to calculate the resultant force:
R = m · a
= (12.3 + 5.1) · 1.5
= 26.1 N
Then, you can calculate the force of friction:
R = F - Fₐ
Fₐ = F - R
= 33 - 26.1
= 6.9 N
Now, we know that:
Fₐ = μ·m·g
Therefore we can solve for μ:
μ = <span>Fₐ/mg
= 6.9 / (17.4 · 9.8)
= 0.40
The coefficient of dynamic friction is </span>μ = <span>0.40
</span>
Extraction of resources costs money.
Problems with usage: for example, coal, when burned, it produces pollution.
Different: The weak nuclear force is responsible for radioactive decay within an atom of a substance, while the electromagnetic force causes electrostatic force between charged particles.
Different: The weak force has a very small range of effectiveness (where the force can be felt) while the electromagnetic force has an infinite range.
Same: Both forces act within an nucleus, or on a nuclear level.
Same: The weak nuclear force is mediated by charged particles called bosons, and the electrostatic force is only present within charged objects
The last one may be a bit of a stretch but I hope this helped a bit!