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Lorico [155]
3 years ago
11

Who discovered the law of conservation of energy?

Physics
2 answers:
BlackZzzverrR [31]3 years ago
6 0

Answer:

Julius Robert Mayer in 1842

Explanation:

weqwewe [10]3 years ago
5 0

Julius Robert Mayer discovered the Law of Conservation of Energy.

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The builders of the pyramids used a long ramp to lift 20000-kg (20.0-ton) blocks. If a block rose 0.840 m in height while travel
olga_2 [115]

Given Information:  

Mass = m =  20000 kg

Height of ramp = h = 0.840 m

Length of ramp = L = 20 m

Required Information:  

Uphill Force = F = ?

Answer:

F = 8232 N

Explanation:

The force can be found using the equation

F = mgsinθ

Where m is the mass of block, g is the acceleration due to gravity

Since the ramp can be modeled as an inclined plane so it can formed into a triangle, recall that in right angle triangle sinθ is equal to opposite over hypotenuse. The opposite is the height and hypotenuse is the ramp surface.

sinθ = h/L = 0.840/20 = 0.042

F = 20000*9.8*0.042

F = 8232 N

Therefore, an uphill force of 8232 N would be needed.

8 0
3 years ago
A cannonball is tired with an initial speed of 40m/s and a launch angle of 30degrees from a cliff that is 25m tall. a. What is t
ella [17]

Answer:

Part a)

t = 5.1 s

Part b)

x = 176.7 m

Explanation:

Initial speed of the launch is given as

v_i = 40 m/s

angle = 30 degree

Now the two components of the velocity

v_x = v_i cos30

v_x = 34.6 m/s

similarly we have

v_y = v_i sin30

v_y = 20 m/s

Part a)

Now to find the time of flight we will have

\Delta y = v_y t + \frac{1}{2}at^2

-25 = 20 t -\frac{1}{2}(9.81)t^2

t = 5.1 s

Part b)

Distance at which the ball will land is given as

x = v_x t

x = 34.6 (5.1)

x = 176.7 m

Part c)

Since x direction there is no acceleration so it will move with uniform speed while in y direction it will accelerate due to gravity

7 0
3 years ago
The _____(height or width) of a sound wave determines its _____(loudness or pitch).
postnew [5]
<h2>Answer: The <u>height</u> of a sound wave determines its <u>loudness</u>  </h2>

Sound waves are longitudinal mechanical waves, that is, they depend on a medium to propagate.

Among the characteristics of a sound wave, it is the amplitude, that is the degree of movement of the molecules of the medium in which the wave propagates.  

Depending on how high this amplitude is, the sound will be louder.

5 0
3 years ago
Read 2 more answers
I need help with #24 ASAP .. I have to get it done today
SOVA2 [1]

Answer:

Explanation: the graph is looking good just put a line to the dot

8 0
2 years ago
What, roughly, is the percent uncertainty in the volume of a spherical beach ball whose radius is 5.66 0.09 m?
iren2701 [21]

Answer:

  • 4.77 %

Explanation:

We know that the volume V for a sphere of radius r is

V(r) = \frac{4}{3} \ \pi \ r^3

If we got an uncertainty \Delta r the formula for the uncertainty of V is:

\Delta V(r) = \sqrt{  (\frac{dV}{dr} \Delta r)^2  }

We can calculate this uncertainty, first we obtain the derivative:

\frac{dV}{dr}  = 3 * \frac{4}{3} \ \pi \ r^2

\frac{dV}{dr}  = 4 \ \pi \ r^2

And using it in the formula:

\Delta V(r) = \sqrt{  (4 \ \pi \ r^2\Delta r)^2  }

\Delta V(r) = \sqrt{  4^2 \ \pi^2 \ r^4 \Delta r^2  }

\Delta V(r) =  4 \  \pi \ r^2 \Delta r

The relative uncertainty is:

\frac{\Delta V(r)}{V(r)}

\frac{ 4 \  \pi \ r^2 \Delta r  }{ \frac{4}{3} \ \pi \ r^3}

\frac{ 3  \Delta r  }{  r}

Using the values for the problem:

\frac{ 3 * 0.09 m  }{  5.66 m} = 0.0477

This is, a percent uncertainty of 4.77 %

4 0
3 years ago
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