Can an object contain heat? Why or why not?

1 answer:

8 0

Every object has thermal energy (better word than heat, since we associate that with high temperatures). This is actually the molecules vibrating, moving a lot. More thermal energy means more vibrating, and thus also expanding in volume.

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Which of these will always produce a magnetic field?

vovikov84 [41]

Answer:

Technically everything has somewhat of a magnetic field. I guess

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3 years ago

Some lenses are shaped with one flat side and one spherically-shaped side. This shape is designed to focus parallel light rays o

Komok [63]

Answer:

Some lenses are used to focus light to a pre-defined point based on the amount of curvature of their surfaces.

In a piano design convex, some surfaces are flat while others has positive lenses (biconvex)

Explanation:

Solution

These lenses are applied to pay attention to light in a point pre-defined based on the amount of curvature of their surfaces.

For that of a plano-convex design, one surface has a positive curve and for biconvex lenses, both surfaces are positively curved while the other remains flat.

when used practically, plano-convex lenses are most commonly used where the object being imaged is far apart from lens.

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3 years ago

Show the weight of the ladder and draw the missing Frictional force.

madreJ [45]

Since there is no friction between the ladder and the wall, there can be no vertical force component. That's the tricky part ;)

So to find the weight, divide the 100N <em>normal</em> force by earths gravitational acceleration, 9.8m/s^2

$W = \frac{N}{g} = \frac{100N}{9.8m/s^{2}} = \frac{100}{9.8} = 10.2kg$

Then;
Draw an arrow at the base of the ladder pointing towards the wall with a value of 30N, to show the frictional force.

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3 years ago

What are the two ways to create plasma?

dimaraw [331]

Answer:

Plasma can be artificially generated by heating a neutral gas or subjecting it to a strong electromagnetic field to the point where an ionized gaseous substance becomes increasingly electrically conductive.

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3 years ago

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a lost puppy of 5 kg is 25 m away from his owner of 90 kg. What is the gravitional attraction between the two

Fudgin [204]

The gravitational attraction 50 m

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