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2 years ago

How long does it take light to travel 850 km in a vacuum? Answer in ms.(Express your answer to two significant figures.)

Physics

1 answer:

poizon [28]2 years ago

5 0

Answer:

0.002833 sec

Explanation:

Speed of light in vacuum is $3\times 10^{8}m/sec$

Given distance = 850 km = 850×1000=850000 m

We have to calculate the time that light take to travel the distance 850 km

Time $T=\frac{distance }{speed}=\frac{850000}{3\times 10^8}=2.833\times 10^{-3}sec$

So the time taken by light to travel 850 km is 0.002833 sec

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What are the advantages and disadvantages of renewable and non-renewable energy?

bogdanovich [222]

Renewable energy

Advantages :-

1. Easily regenerate

2. Boost economic growth

3. Easily available

4. Support environment

5. Low maintenance cost

Disadvantages :-

1. Weather dependency

2. High installation cost

3. Noise caused by wind energy

4. Fluctuation problem (solar)

5. Intermittency issue (wind)

Non-renewable energy

Advantages :-

1. Concentrated energy source

2. Reliable energy source

3. Can be built anywhere

4. No radioactive waste

Disadvantages :-

1. Produces greenhouse gases

2. Contributes to global warming

3. Produces acid rain

4. Harmful to environment when they are burnt

I hope this helps.....

5 0

2 years ago

Elza [17]

C is the correct answer

4 0

2 years ago

Read 2 more answers

A 15-µF capacitor and a 25-µF capacitor are connected in parallel, and charged to a potential difference of 60 V. How much energ

Alborosie

Answer:

Energy stored, E = 0.072 J

Explanation:

Given that,

Capacitance, $C_1=15\ \mu F$

Capacitance, $C_2=25\ \mu F$

These two capacitor are connected in parallel, and charged to a potential difference of, V = 60 volts

We know that in parallel combination of capacitor, the equivalent capacitance is given by :

$C=C_1+C_2\\\\C=(15+25)\ \mu F\\\\C=40\times 10^{-6}\ F$

The energy stored in the capacitor is given by :

$E=\dfrac{1}{2}CV^2\\\\E=\dfrac{1}{2}\times 40\times 10^{-6}\times (60)^2\\\\E=0.072\ J$

So, the energy stored in the capacitor in this capacitor combination is 0.072 J.

4 0

3 years ago

A ball is tied to a 1.3 m string and whirled in a circular motion with a force of 220 N. If its speed is 6 m/s, (a) what is it c

Studentka2010 [4]

The centripetal acceleration is 27.692 kg m / s^2.

The mass of the ball is 7.94 kg.

Explanation:

The curved path of an object experience a force known as centripetal force. Its direction is always pointing to the motion of the body towards the center of curvature of the path.

centripetal force Fc = (mass * square of velocity) / radius

where m represents mass in kg

v represents velocity

r represents radius in a meter.

The acceleration experienced in uniform circular motion is called as centripetal acceleration.It always points toward the center of rotation and is perpendicular to the linear velocity.

centripetal acceleration = v^2 / r

= (6 * 6) / 1.3

= 27.692 kg m / s^2.

The mass of the ball is found by using the centripetal force formula,

centripetal force Fc = m v^2 / r

m = (F * r) / v^2

= (220 * 1.3) / 36

mass of the ball m = 7.94 kg.

6 0

3 years ago

If a space ship traveling at 1000 miles per hour enters an area free of gravitational forces, its engine must run at some minimu

valentina_108 [34]

That is false, if there are no forces acting upon it then its momentum will never die off there for unless a gravitational force acted upon it it will travel at 1000 MPH forever

4 0

2 years ago