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3 years ago

What is newton's second law of motion?

Physics

1 answer:

lord [1]3 years ago

3 0

Answer:

Newton's second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

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If a nearsighted person has a far point df that is 3.50m from the eye, what is the focal length f1 of the contact lenses that th

olga55 [171]

Answer:

f1= -350cm or -3.5m

f2= 22.1cm or 0.221m

Explanation:

A person is nearsighted when the person's far point is less than infinity. A diverging lens is normally used to correct this eye defect. A diverging lens has a negative focal length as seen in the solution attached.

Farsightedness is when a person's near point is farther than 25cm. This eye defect is corrected using a converging lens. The focal length of a converging lens is positive. This is evident in the solution attached. The near point is also referred to as the least distance of distinct vision.

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3 years ago

An ac power generator produces 73.37 a (rms) at 4623 v. the voltage is stepped up to 105,033 v by an ideal transformer, and the

evablogger [386]

Step up transformer is a device which is used to step up the voltage which is input with some value.

This is based upon the principle of mutual inductance and in this the voltage input and voltage output is different because of number of turns.

Here if ideal transformer is given then power input and power output of the transformer must be same as there is no power loss in ideal transformer.

So we can write

$i_pV_p = i_sV_s$

here

$i_p$ = 73.37 A

$V_p$ = 4623 V

$V_s$ = 105033 A

now using above equation we will have

$73.37*4623 = 105033*i_s$

solving above we will have

$i_s = 3.23 A$

7 0

3 years ago

An electromagnet is created using a battery, an insulated copper wire and an iron nail. The wire is wrapped around the nail 20 t

Molodets [167]

I think adding more loops would strengthen it

4 0

3 years ago

If a resistor draws 1.2 x 10^-3 a of current from a 12 v battery, then what is the value of the resistor?

bixtya [17]

Value of resistor = (12V) /(1.2 x 10^-3A)=10000ohms=10k ohms

8 0

3 years ago

In 2014, a space probe approached the rocky core of the comet Churyumov–Gerasimenko, which is only a few km in diameter. The pro

saul85 [17]

Answer: 14.62 Earth days

Explanation:

This problem can be solved by Kepler’s Third Law of Planetary motion:

$T=2 \pi \sqrt{\frac{a^{3}}{GM}}$

Where:

$T$ is the period of the probe

$G=6.674(10)^{-11}\frac{m^{3}}{kgs^{2}}$ is the Gravitational Constant

$M=1(10)^{13} kg$ is the mass of the comet Churyumov–Gerasimenko

$a=30 km \frac{1000 m}{1 km}=30000 m$ is the semimajor axis of the orbit the probe described around the comet (assuming it is a circular orbit, the semimajor axis is equal to the radius of the orbit)

$T=2 \pi \sqrt{\frac{(30000 m)^{3}}{(6.674(10)^{-11}\frac{m^{3}}{kgs^{2}})(1(10)^{13} kg)}}$

$T=1,263,771.768 s \frac{1 h}{3600 s} \frac{1 Earth-day}{24 h}=14.62 Earth-days$

Hence, the orbital period of the probe is 14.62 Earth days.

3 0

3 years ago