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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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3 years ago
A person in the back of a pick-up moving at 20 m/s relative to the Earth, throws a baseball with a speed of 15 m/s in a directio
Bumek [7]

Answer:

This is known as a Galilean transformation where

V' = V - U

Where the primed frame is the Earth frame and the unprimed frame is the frame moving with respect to the moving frame

V - speed of object in the unprimed frame

U - speed of primed frame with respect to the unprimed frame

Here we have:

V = -15 m/s        speed of ball in the moving frame (the truck)

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So  V' = -15 - (-20) = 5 m/s

It may help if you draw a vector representing the moving frame and then add

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3 0
3 years ago
A 5.0-kg block of wood is placed on a 2.0-kg aluminum frying pan. How much heat is required to raise the temperature of both the
Shalnov [3]

Heat required to raise the temperature of a given system is

Q = ms\Delta T

here we know that

m = mass

s = specific heat capacity

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now as we know that

mass of wood = 5 kg

mass of aluminium pan = 2 kg

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specific heat capacity of wood = 1700 J/kg C

specific heat capacity of aluminium = 900 J/kg C

now here we will find the total heat to raise the temperature of both

Q = m_1s_1\Delta T_1 + m_2s_2\Delta T_2

Q = 5 * 1700 * 25 + 2 * 900 * 25

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So heat required to raise the temperature of the system is 257500 J

4 0
3 years ago
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Lady_Fox [76]
The third choice is correct
8 0
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GarryVolchara [31]

the answer is c) the speed and direction of travel must be constant


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