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2 years ago

15

Describe a procedure that would increase the potential energy of two magnets if like poles are used. Explain why the energy of t

he system increases.

1 answer:

zalisa [80]2 years ago

5 0

Answer:

If you apply a force to separate 2 opposite poles, the potential energy of the system increases.

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A car travelling at 10 m/s accelerates at 3 m/s^2 for 6 seconds. What is the final velocity of the car?

tankabanditka [31]

Answer:28m/s

Explanation:I got one point so yeah hope this help

7 0

2 years ago

Find the noise level of a sound having an intensity of 1.5x10^-14W/m^2 given I0=10^12 W/m2

Llana [10]

Answer:

Noise level will be -18.2 watt

So option (b) will be correct answer

Explanation:

We have given sound intensity $I=1.5\times 10^{-14}w/m^2$

And threshold intensity $I_0=\times 10^{-12}w/m^2$ ( in question it is given as $10^{12}w/m^2$ but its standard value is $10^{-12}w/m^2$ )

Now noise level $=10log\frac{I}{I_0}=10log\frac{1.5\times 10^{-14}}{10^{-12}}=10log0.015-18.23$

So the noise level will be -18.2

So option (b) will be correct answer

5 0

3 years ago

A resistor, an inductor, and a switch are all connected in series to an ideal battery of constant terminal voltage. What does th

Irina-Kira [14]

Answer:

The time constant τ = L/R represent the time requiered for the curent to get value of 63 % of its maximun value

Explanation:

In a circuit RL ( serie circuit with a resistor R and the inductor L ) when a voltage is applied the inductor will have a reaction, such reaction consist in the creation of an electromotive force which will prevent the current to get its maximun value. The time constant which in the case of an inductor is

τ = L/R , represent the time requiered for the crrent to be 63 % of its final value

4 0

3 years ago

Which of the following boxes would have the strongest gravitational pull on a third object positioned at an equal distance from

trasher [3.6K]

<span>A. box b because it has more mass </span>

3 0

2 years ago

What is the speed of a train that goes 1,000 km in 5 hours?

jonny [76]

Answer:

200 km/h

Explanation:

Because the train is travelling 1000 km in 5 hours, you simply divide 1000 by 5, giving you 200 km/h. This is about 124.27 mph.

4 0

2 years ago