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xenn [34]
2 years ago
15

State a Newtowns second law​

Physics
1 answer:
astraxan [27]2 years ago
5 0

Answer:

the second law states that the force F is the product of an object's mass and its acceleration a: F = m * a. For an external applied force, the change in velocity depends on the mass of the object.

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demonstrate in a brief paragraph how the search to explain planetary orbits exemplifies the scientific method and then use of mo
kari74 [83]

Answer:

People firstly believe that the planets move in a circular orbit until Newton came up with his hypothesis by inventing calculus so that we could understood and calculated planetary orbits and their accuracy.

Explanation:

  • Everyone assumed the planets were perfect circles until Newton came up with an idea. Slowly people would make maps of the orbits that added circles on circles, and they could never really explain about the movement of the planet. They simply say that planets move on circles but they lacked the math to explain or prove it. Then Newton came up with an idea of inventing calculus so that we could understood and calculated planetary orbits and their accuracy.
  • Firstly people used their observations and say that the orbits looked like circles, then they developed their models and did the math, and proposed their hypothesizes which were wrong, until Newton came along and tried to match a model that used elliptical orbits and invented the math that allowed him to make predictions with it. His model worked for most planets.
  • However he could not explain about the planet Mercury for instance since it was a very strange orbit. Then after the Einstein's theory of General Relativity he could also explain very deeply about it.
  • Scientists and Astronomers made hypothesizes that there was another planet orbiting too close to the sun to see with telescopes, called Vulcan, that explained mercury's orbit before Einstein's theory. Then long after we had telescopes which was good enough to see if there was a planet orbiting closer to the sun than mercury.  
8 0
2 years ago
The time T in seconds for a pendulum of length L feet to make one swing is given by Upper T=2\pi \sqrt((L)/(36)). How long is a
Andreyy89

Answer:

3.6ft

Explanation:

Using= 2*π*sqrt(L/32)

To solve for L, first move 2*n over:

T/(2*π) = sqrt(L/32)

Next,eliminate the square root by squaring both sides

(T/(2*π))2 = L/32

or

T2/(4π2) = L/32

Lastly, multiply both sides by 32 to yield:

32T2/(4π2) = L

and simplify:

8T²/π²= L

Hence, L(T) = 8T²/π²

But T = 2.1

Pi= 3.14

8(2.1)²/3.14²

35.28/9.85

= 3.6feet

5 0
3 years ago
The first American to orbit the earth was:
alexdok [17]
John Glenn is the first American to orbit the Earth.

<span>♡♡Hope I helped!!! :)♡♡
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3 0
3 years ago
Read 2 more answers
The coefficients of friction between the load and the flatbed trailershown are μs = 0.40 and μk = 0.30. Knowing that the speed o
SOVA2 [1]

Answer:

50.97 m

Explanation:

m = Mass of truck

\mu_s = Coefficient of static friction = 0.4

v = Final velocity = 0

u = Initial velocity = 72 km/h = \dfrac{72}{3.6}=20\ \text{m/s}

s = Displacement

Force applied

F=ma

Frictional force

f=\mu_s mg

Now these forces act opposite to each other so are equal. This is valid for the case when the load does not slide

ma=\mu_s mg\\\Rightarrow a=\mu_s g\\\Rightarrow a=0.4\times 9.81\\\Rightarrow a=3.924\ \text{m/s}^2

Since the obect will be decelerating the acceleration will be -3.924\ \text{m/s}^2

From the kinematic equations we have

v^2-u^2=2as\\\Rightarrow s=\dfrac{v^2-u^2}{2a}\\\Rightarrow s=\dfrac{0^2-20^2}{2\times -3.924}\\\Rightarrow s=50.97\ \text{m}

So, the minimum distance at which the car will stop without making the load shift is 50.97 m.

5 0
2 years ago
How does a simple machine facilitate our work​
marta [7]

Answer:

Simple machines are useful because they reduce effort needed for people to perform tasks beyond their normal capabilities.

Explanation:

6 0
3 years ago
Read 2 more answers
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