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inessss [21]
3 years ago
15

. How much work in joules is done by a person who uses a force of 25 N to move a desk 3.0 m?

Physics
1 answer:
sergejj [24]3 years ago
7 0
We Know, W = F * s
here, F = 25 N
s = 3 m

Substitute it into the expression,
W = 25 * 3
W = 75 Joule

So, your final answer is 75 J

Hope this helps!

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A wheel of mass 4kg is pulled up a plane inclined at 30° to the horizontal by a force of 45N applied to the axle and parallel to
Len [333]

Answer:

v = 10 m/s

Explanation:

Let's assume the wheel does not slip as it accelerates.

Energy theory is more straightforward than kinematics in my opinion.

Work done on the wheel

W = Fd = 45(12) = 540 J

Some is converted to potential energy

PE = mgh = 4(9.8)12sin30 = 235.2 J

As there is no friction mentioned, the remainder is kinetic energy

KE = 540 - 235.2 = 304.8 J

KE = ½mv² + ½Iω²

ω = v/R

KE = ½mv² + ½I(v/R)² = ½(m + I/R²)v²

v = √(2KE / (m + I/R²))

v = √(2(304.8) / (4 + 0.5/0.5²)) = √101.6

v = 10.07968...

5 0
3 years ago
Calculate the kinetic energy of a dog,
Vanyuwa [196]

B: 20 j

Explanation. Because

6 0
3 years ago
there are two slides at the park between which you are deciding. Both start at the height of 6 meter. One is short and Steve whi
kumpel [21]

It doesn't matter.  If the slides are truly frictionless, then
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___________________________

The only way I can think of that it would make a difference
would be if the shallow slide were REALLY REALLY long,
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bottom, you'd need to be going a little bit faster.

But if it takes less than, say, two or three days, to go down the
long, shallow slide, then this effect would probably be too small
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