3 years ago

What is the original source of the energy stored in fossil fuels?

Physics

1 answer:

KengaRu [80]3 years ago

6 0

Answer:

Plants the chloroplasts

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zloy xaker [14]

Answer:

Explanation:

At the other end of the spectrum toward red, the wavelengths are longer and have lower energy.

8 0

3 years ago

The ability to cause change is defined as:

ehidna [41]

The question is poorly written.
ALL of the choices cause a change in something.

A). Force causes a change in velocity.

B). and C). Power and energy cause changes requiring work.

D). Impulse causes a change in momentum.

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4 years ago

A spring with k = 53 N/m hangs vertically next to a ruler. The end of the spring is next to the 18 cm mark on the ruler. If a 2.

Anarel [89]

Answer:

1.07 m

Explanation:

x = Compression of the spring

k = Spring constant = 53 N/m

Initial length = 18 cm

P = Kinetic energy

K = Kinetic energy

At the lowest point of the mass the energy conservation is as follows

$P_{ig}+P_{is}+K_i=P_{fg}+P_{fs}+K_f\\\Rightarrow mgx+0+0=mgx+\frac{1}{2}kx^2\\\Rightarrow x=\frac{2mg}{k}\\\Rightarrow x=\frac{2\times 2.4\times 9.81}{53}\\\Rightarrow x=0.89\ m$

At its lowest position the mark on the ruler will be

$x_f=0.18+0.89\\\Rightarrow x_f=1.07\ m$

The spring line will end up at 1.07 m

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3 years ago

A uniform, thin rod of length h and mass M is held vertically with its lower end resting on a frictionless horizontal surface. T

saveliy_v [14]

Answer:

$v = \sqrt{gh}$

Explanation:

Since there's no external force beside gravity acting on the rod, we can use the law of energy conservation to calculate for the speed of rod center of gravity before hitting the surface.

Also as the rod is uniform and this, its center of gravity is at distance h/2 from the surface.

$E_k = E_p$