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In-s [12.5K]
3 years ago
15

1. The gravitational force acting on a falling body and its weight is constant. But the law of universal gravitation tells us th

at the gravitational force on a body increases as it gets closer to Earth’s center. Is there a contradiction here?
Physics
1 answer:
vagabundo [1.1K]3 years ago
3 0
It's not so much a "contradiction" as an approximation. Newton's law of gravitation is an inverse square law whose range is large. It keeps people on the ground, and it keeps satellites in orbit and that's some thousands of km. The force on someone on the ground - their weight - is probably a lot larger than the centripetal force keeping a satellite in orbit (though I've not actually done a calculation to totally verify this). The distance a falling body - a coin, say - travels is very small, and over such a small distance gravity is assumed/approximated to be constant.
You might be interested in
A rubber band has a spring constant of 45 N/m. A classmate stretches it a length of 0.2 m before firing it at Mr. C. Ouch. Calcu
nata0808 [166]

Answer:

<h2>0.9 Joules</h2>

Explanation:

Elastic potential energy of a spring= 1/2 × Spring constant × displacement²

following calculations you will get ur answer!!

5 0
3 years ago
Calculate the average speed of a complete round trip in which the outgoing 300 km is covered at 93 km/h , followed by a 1.0-h lu
madreJ [45]

Answer : 63 km/h

Explanation :

Outgoing distance = 300 km.

Outgoing speed = 93 km/h.

Break time = 1 h

Return distance = 300 km

Return speed = 56 km/h

Outgoing time  = outgoing distance / outgoing speed

Outgoing time   = 300 km / 93 km/h = 3.225806451612 h

Return time  = return distance / return speed

Return time = 300 km / 56 km/h = 5.357142867142 h

Total distance =. Outgoing distance + return distance travelled

Total distance  = 300 km + 300 km = 600 km

Total time = outgoing time + break time + return time

Total time = 3.225806451612 h + 1 h+ 5. 357142867142 h = 9.582949308754 h

Average speed = total distance / total time

Average speed = 600 km / 9.582949308754 h

Average speed = 62.61120462042 km/h = 63 km/h

3 0
3 years ago
Astronomers currently estimate the age of the universe to be:.
lina2011 [118]
Nearly 14 billion years, according to astronomers. Happy to help!
7 0
2 years ago
A Pitot-static probe is used to measure the speed of an aircraft flying at 3000 m. If the differential pressure reading is 3300
adell [148]

Answer:

   v = 306.76 Km/h

Explanation:

given,

height of the aircraft = 3000 m

differential pressure reading = 3300 N/m²

density of air = 0.909 Kg/m³

speed of aircraft = ?

Assuming the air flowing above air craft is in-compressible, irrotational and steady so, we can use Bernoulli's equation to solve the problem.

using Bernoulli's equation

          \dfrac{v^2}{2} = \dfrac{\Delta P}{\rho}

where ρ is the density of the air at 3000 m

          v= \sqrt{\dfrac{2 \times \Delta P}{\rho}}

          v= \sqrt{\dfrac{2 \times 3300}{0.909}}

          v = \sqrt{7260.726}

                 v = 85.21 m/s

          v= 85.21 \times \dfrac{3600}{1000}

                 v = 306.76 Km/h

4 0
3 years ago
Convert the Celsius temperature of the surface of the sun, which is
Ghella [55]
So,

The conversion factor is:

F = C *  \frac{9}{5} + 32

So, if we plug in the numbers, we get:
F = 5500 *  \frac{9}{5} +32

Multiply
\frac{5500}{1} * \frac{9}{5} = 9900

Add 32
9900 + 32 = 9932

5500 degrees Celsius = 9932 degrees Farenheit.
5 0
3 years ago
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