3 years ago

Twenty students were surveyed to find out how many hours of tv they watch during a school week

Physics

1 answer:

EastWind [94]3 years ago

7 0

Whats the question?.....

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How do u answer this?

gayaneshka [121]

Answer:

food

Explanation:

did you get a chance to look at the maximum number of devices allowed by

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3 years ago

Which of the following must be true for “P if and only if Q” to be true?

erastovalidia [21]

Explain or message me what your trying to ask!

6 0

3 years ago

An electric motor consumes 8.40 kJ of electrical energy in 1.00 min. Part A If one-third of this energy goes into heat and other

Salsk061 [2.6K]

Answer:

The torque is 0.31 Nm.

Explanation:

Electrical energy, E = 8400 J

time, t = 1 min

Angular speed, w = 2900 rpm = 303.53 rad/s

efficiency = 2/3 of input power

The toque is given by

$P =\tau w\\\\\frac{2}{3}\times \frac{E}{t}=\tau w\\\\\frac{2}{3}\times \frac{8400}{60}=\tau \times 303.53\\\\\tau =0.31 Nm$

3 0

3 years ago

There is a decrease in power. It can be concluded that there has also been a change in: A)current or voltage.

liraira [26]

A current or voltage

5 0

3 years ago

Given that the efficiency of heating your room is roughly 35%, what mass of natural gas is actually necessary to heat your room

Mrac [35]

Answer:

Mass of natural gas needed to heat the room is 350,000BTUs

Explanation:

The heating efficiency of a furnace is never 100% because not all energy is released and not all heat is available to heat the place. A lesser efficiency requires more consumption of fuel. Heating values are used for heating fuels in order to calculate the mass of fuel needed.

The heating value of natural gas is 1,000,000BTUs

Therefore the formular for calculating mass of natural gas needed= Heating value of natural gas×efficiency.

Mass=1,000,000×0.35

Mass=350,000BTUs

3 0

3 years ago