How much gravitational potential energy does the block have
when it gets to the top of the ramp ?
(weight) x (height) = (15 N) x (0.2 m) = 3 Joules .
If there were no friction, you would only need to do 3 Joules of work
to lift the block from the bottom to the top.
But the question says you actually have to do 4 Joules of work
to get the job done.
Friction stole one of your Joules along the way.
Choice-4 is not the correct one.
Choice-1 is the correct one.
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Notice that the mass of the block is NOT 15 kg , and you
don't have to worry about gravity to answer this question.
The formula for potential energy is (m)·(g)·(h) .
But (m·g) is just the WEIGHT, and the formula
is actually (weight)·(height).
The question GIVES us the weight of the block . . . 15 N .
So the potential energy at the top is just (15N)·(0.2m) = 3 Joules.
<h2>Answer with Explanation</h2>
A biozone is a portion of a layer of Earth’s crust where fossils are found. Biozones help scientists to excavate the fossils and help trace the path of evolution over time as it is a stratigraphic unit which is defined by its fossil content. There are several different ways in which biozones can be designated in terms of the zone fossils that they contain and often, some environmental factors that take place to consider the definition and interpretation of biozones.
The position vector of the bullet has components
The bullet hits the ground when , which corresponds to time :
The bullet travels 168 m horizontally, which would require a muzzle velocity such that
Explanation:
<h3>Answer in the figure </h3>
<h3>Hope it helps you </h3>
Answer:
m = 0.164 kg
Explanation:
T (period)
k (force/spring constant)
m (mass)
T = 2*Pi*sqrt(m/k)
T/(2*Pi) = sqrt(m)/sqrt(k)
(T/(2*Pi))*sqrt(k) = sqrt(m)
m = ((T/(2*Pi))*sqrt(k))^2
m = 4.5*((1.2/(2*Pi)))^2
m = 0.1641403175