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dexar [7]
3 years ago
5

A lamp has a power of 120 W and is left on for 24 hours . A television has a power of 350 W and is left on for three hours . com

pares the energy used by these devices
Physics
2 answers:
boyakko [2]3 years ago
8 0

Answer:

2.74

Explanation:

Power of lamp, PL = 120 W, t = 24 hours

Power of TV, PT = 350 W, t = 3 hours

Energy consumed by a lamp, EL = Power x time = 120 x 24 = 2880 W h

Energy consumed by a TV, ET = power x time = 350 x 3 = 1050 W h

EL / ET = 2880 / 1050 = 2.74

Paladinen [302]3 years ago
7 0
This is a power problem which requires the rearranging of a formula. The lamps energy used is 5 N, and the TV’s usage is 116.7 N (rounded from 116.6666repeating). Here my work:
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Explanation:

Hi there!

Please, see the attached figure for a better understanding of the problem.

The motion of the salmon is a parabolic one because when it jumps, it already has a horizontal velocity (see figure).

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v = (v0x, v0y + g · t)

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v0y = initial vertical velocity.

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Now, using the equation of the vertical component of the velocity at the maximum height (vy = 0):

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y = 0 m + 6.55 m/s · 0.67 s + 1/2 · (-9.8 m/s²) · (0.67 s)²

y = 2.19 m

The maximum height that the fish can jump is 2.19 m.

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