All categories

2 years ago

Who discovered the law of conservation of energy?

Physics

2 answers:

BlackZzzverrR [31]2 years ago

6 0

Answer:

Julius Robert Mayer in 1842

Explanation:

weqwewe [10]2 years ago

5 0

Julius Robert Mayer discovered the Law of Conservation of Energy.

You might be interested in

A object of mass 33 is dropped from a height of 85 meters. Calculate the average power developed by the object in falling throug

DochEvi [55]

Power = Work done / Time taken.

Work done = mgh
Mass, m = 33kg ( Am presuming it is 33 kg).
h = 85 m.
Work done = 33 * 9.81* 85 = 27517.05 J.

Time taken.
Since object was dropped from height, it fell under gravity.
Using H = ut + (1/2) * gt^2. u = 0.
   H = 1/2 gt^2.
   t =   (2H/g) ^ (1/2)
   t = (2*85/9.81) ^ 0.5 = 4.1628 s.

Power = 27517.05 / 4.1628 = 6610.23 Watts.
   = 6610 W to 3 S. f.

3 0

2 years ago

A rectangular field is to be enclosed on four sides with a fence. Fencing costs $2 per foot for two opposite sides, and $3 per f

borishaifa [10]

<h2>Dimension for cheap enclose = 32.45 ft x 23.52 ft</h2>

Explanation:

Area of rectangular field, A = 830 ft²

Length = l

Width = w

So we have

l x w = 830

$l=\frac{830}{w}$

Fencing costs $2 per foot for two opposite sides, and $3 per foot for the other two sides.

Cost for fencing, C = 2 x 2 x w + 3 x 2 x l = 4 w + 6 l

$C=4w+6\times \frac{830}{w}$

For minimum cost we have derivative is zero

$dC=4\times dw-6\times \frac{830}{w^2}\times dw\\\\0=4\times dw-6\times \frac{830}{w^2}\times dw\\\\w^2=1245\\\\w=32.45ft\\\\lw=830\\\\l\times 32.45=830\\\\l=23.52ft$

Dimension for cheap enclose = 32.45 ft x 23.52 ft

8 0

2 years ago

Define the focus of a concave lens

Sophie [7]

Answer:

Principal focus of concave lens - 

★ The point at which rays parallel to principal axis coming from infinity appear to converge after being refracted from concave lens is called the principal focus of concave lens.

________________________

• Additional information - 

★ Principal focus - A number of rays parallel to the principal axis after reflection from a concave mirror meet at a point on the principal axis or appear to come from a point after reflection from a convex mirror on the principal axis. This is called principal focus.

8 0

2 years ago

Two bricks are released at the same time from the same point ten feet above the ground. One of the bricks is falling straight do

natita [175]

Both bricks will hit the ground at the same time.

Falling vertically is always accelerating at 9.8 m/s² because of gravity.
Nothing that's happening horizontally has any effect on that.
The brick that happens to have some horizontal motion will
probably hit the ground way over there, but that will still be
at the same TIME as this one.

This is a perfect place to remind you of the old unbelievable story,
which I'll bet you heard before:

If you fire a bullet horizontally from a gun, and at the exact same
moment you DROP another bullet out of your hand next to the gun,
the two bullets will hit the ground at the same time ! Even though
they'll be far apart.

Horizontal speed has no effect on vertical behavior.

7 0

2 years ago

9. How are the fossils in question 8 formed?

Bingel [31]

Well what’s the question?..

7 0

2 years ago