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4 years ago

How is the gravitational force related to the distance between two objects?

1 answer:

7 0

gravitational force is inversely proportional to the square of the separation distance between the two interacting objects

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Fig. 2.1 shows a train

Vitek1552 [10]

Answer:

$\mathrm{(a)\:}32,000,000\:\mathrm{Ns},\\\mathrm{(b)\:}390,000\:\mathrm{N}$

Explanation:

The impulse-momentum theorem states the impulse on an object is equal to the change in momentum of that object. Momentum is given by $p=mv$ . Since mass is constant, the train's change in momentum is:

$\Delta p=m\Delta v=750,000\cdot42=31,500,000=\fbox{$32,000,000\:\mathrm{Ns}$}$ (two significant figures).

Impulse is also given as $\Delta p = F\Delta t$ , where $F$ is the average force applied and $\Delta t$ is change in time. Since $t$ is given as $80\mathrm{s}$ , we have the following equation:

$F\Delta t=\Delta p\\\\F=\frac{\Delta p}{\Delta t},\\\\F=\frac{31,500,000}{80},\\\\F=393,750=\fbox{$390,000\:\mathrm{N}$}$ (two significant figures).

7 0

3 years ago

Is speed or velocity more helpful to a pilot?

Dima020 [189]

Velocity, as it is is a vector quantity, so it has both direction and magnitude.
Speed is a scalar quantity, so it only has magnitude, no direction.

3 0

3 years ago

Read 2 more answers

A steeper incline plane will require _____ Force

ExtremeBDS [4]

Answer:

wind

Explanation:

8 0

3 years ago

Im stuck on number 4, am I just supposed to talk about theory because there is no given info.

Strike441 [17]

Explanation:

Assuming no air resistance, the horizontal acceleration at all points is 0, and the vertical acceleration at all points is -g (if near the surface of the Earth, -9.8 m/s²).

6 0

4 years ago

If an ocean wave passes a stationary point every 5 s and has a velocity of 10 m/s, what is the wavelength of the wave

Rainbow [258]

Answer:

As Per Provided Information

Velocity of wave v is 10m/s

These ocean wave passes a stationary point every 5 s ( It's time period)

First we calculate the frequency of ocean wave .

Using Formulae

$\blue{\boxed{\bf \: \nu = \cfrac{1}{v}}}$

here

v is the velocity of wave .

$\sf\longrightarrow \nu \: = \cfrac{1}{10} \\ \\ \\ \sf\longrightarrow \nu \: = 0.1Hz$

Now calculating the wavelength of the wave .

Using Formulae 

$\boxed{ \bf \lambda = \cfrac{v}{ \nu}}$

Substituting the value and we obtain

$\sf \longrightarrow \lambda \: = \cfrac{10}{0.1} \\ \\ \\ \sf \longrightarrow \lambda \: = \cancel\cfrac{10}{0.1} \\ \\ \\ \sf \longrightarrow \lambda \: =100m$

Therefore,

Wavelength of the wave is 100 metres.

8 0

3 years ago