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Burka [1]
3 years ago
10

After Pedro had breakfast, he went for a run. Identify at least three energy transformations that had to take place to allow Ped

ro to complete his run. Then use evidence to support the claim that energy in this system was conserved as it was transformed.
Physics
1 answer:
FinnZ [79.3K]3 years ago
3 0

Answer:

1) Chemical to mechanical (calories -> muscle contractions)

2) mechanical to mechanical (muscle -> motion)

3) mechanical to thermal (motion -> heat from the body causes sweating)

The potential energy is stored in the body chemically (via food). That potential energy is then released when the body is put in motion.

Explanation:

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A block is at rest on a incline plane as shown in the diagram.As angle is increased, the componet of the blocks weight parallel
Elodia [21]

Answer:

The component of block weight parallel to the plane, Wₓ = W cosθ

Explanation:

Let the weight of the block due to gravitation is W

The direction of the weight is vertically down

Let θ be the angle formed with the vertical weight of the block and the incline.

Taking two components of weight one along the vertical weight and another component perpendicular to it.

Then the component `of weight long the parallel of the plane is

                                   Wₓ = W cosθ        

6 0
3 years ago
6
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Answer:

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8 0
3 years ago
What is happening if energy input remains constant and voltage remains the same in a circuit, but the current decreases?
inysia [295]
V=IR. This is the formula that you can use to figure this question out. Because the voltage stays the same and the current decreases, this means that the resistance has increased.
7 0
3 years ago
Evelyn learns that a sound wave can be recorded electronically as an analog signal or as a digital signal. She investigates thes
Lunna [17]

Answer:

can u help me with this too, i currently have it in an assignment and i dont know the answer

Explanation:

4 0
3 years ago
An 800-kHz radio signal is detected at a point 4.5 km distant from a transmitter tower. The electric field amplitude of the sign
saul85 [17]

Answer:

2.1\times 10^{-9} T

Explanation:

We are given that

Frequency,f=800KHz=800\times 10^{3} Hz

1kHz=10^{3} Hz

Distance,d=4.5 km=4.5\times 10^{3} m

1 km=1000 m

Electric field,E=0.63V/m

We have to find the magnetic field amplitude of the signal at that point.

c=3\times 10^8 m/s

We know that

B=\frac{E}{c}

B=\frac{0.63}{3\times 10^8}=0.21\times 10^{-8} T

B=2.1\times 10^{-9} T

8 0
4 years ago
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