PHYSICS HIGH SCHOOL

The two forces in each pair may have different physical origins (for instance, one of the forces could be due to gravity, and its pair force could be due to friction or electric charge). a) True
b) False

Answers

Answer 1
Answer:

Answer:

b)False

Explanation:

This is the false statement .The two forces in each pair could not have different physical origins.

The two pair of forces have same origin.It can not be possible that one is electric force and other one is gravity force or friction force.

We know that magnitude of electric force is much smaller than the friction force .So they can not be in pair form.

Answer is b)  False

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if the light completed the 71.0-km round trip in the time it took the mirror to complete one-eighth of a revolution, what is the speed of light?

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Which of the following is a consequence of using fossil fuels as an energy source?A. decreased carbon dioxide levels
B. increased biodiversity
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Answers

Answer:

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Explanation:

I need help I can't solve it and I'm struggling badly. Justin weighs 185 lb. and decides to climb a staircase that has a vertical distance of 12 m. He climbs the stairs in 12.7 seconds. Calculate his work:

Answers

Answer:

Power is work/time - not needed here

W(work) = F * D      force * distance

Here W = M g h

Since 2.20 lb is equivalent to 1 kilogram mass

W = 185 lb / 2.20 lb/kg * 9.80 m/s^2 * 12 m = 824 Joules

note that a pound is a unit of force and a kilogram is a unit of mass

Susan works 8 hours a day and makes $7.00 per hour. How much money does Susan earn in one week if she works 5 days per week?

Answers

Get the amount of money in a day, (8)(7)=$56 per day
5 days per week, 56(5)=280
To conclude, she gets $280 in a week.
8 multiplied by 7-$56(this is the amount she got in one day of work)
56 multiplied by 5-(This amounts to the total she is paid) equals-$280

What is the pitch of a sound wave?

Answers

That's the impression you get from the sound, that you call 'high' or 'low', determined by the FREQUENCY of the wave.

A car with a mass of 1500 kg is traveling at a speed of 30 m/s. Calculate its kinetic energy.step by step pls​​

Answers

Explanation:

KE = 1/2 mv²,

where KE is the kinetic energy,

m is the mass,

and v is the velocity.

Given m = 1500 kg and v = 30 m/s:

KE = 1/2 (1500 kg) (30 m/s)²

KE = 675,000 J

KE = 675 kJ
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