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3 years ago

a car is going around a roundabout.explain why we say that it is accelerating even if it is moving at a constant speed.

1 answer:

4 0

Because 'acceleration' does NOT mean 'speeding up'.
It means ANY change in motion ... speeding up, slowing down,
or changing DIRECTION.

When traveling a roundabout, or any curved path, the direction
is constantly changing even if the speed is constant, so there is
constant acceleration going on.

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alexandr402 [8]

Answer:

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3 years ago

In the fall of 2002, a group of scientists at Los Alamos National Laboratory determined that the critical mass of neptunium-237

Llana [10]

The concepts required to solve this problem are those related to density, as a function of mass and volume. In turn, we will use the geometric concept defined for the volume.

The relationship between volume, density and mass is given under the function

$\rho = \frac{m}{V}$

Here,

m = Mass

V = Velocity

Rearranging for the Volume,

$V = \frac{m}{\rho}$

With our information the volume is

$V = \frac{60kg}{19.5g/cm^3 (\frac{10^3kg/m^3}{1g/cm^3})}$

$V = 3.0769*10^{-3}m^3$

Now the volume of sphere is expressed as

$V = \frac{4}{3} \pi r^3$

Here r is the radius of Sphere, then rearranging to find the radius we have

$r = \sqrt[3]{\frac{3V}{4\pi}}$

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$r = 0.0902m$

Therefore the radius of a sphere made of this material that has a critical mass is 9.02cm

8 0

3 years ago

How much work does a 30W engine do if it operates for 40 seconds

swat32

Given that :

Power (P) = 30 W ,

time (t) = 40 s,

Work = ?

we know that, power is defined as rate of doing work

Power = Work ÷ time

=> Work = Power × time

= 30 × 40

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3 years ago

A ball is dropped from a height of 1.20 m and hits the floor. The ball compresses and then reforms to spring upwards from the fl

Zina [86]

The ball's acceleration while it is contact with the floor is 98.4m/s²

<u>Explanation:</u>

V1 = -√(2gh1) = -4.85 m/s

V2 = √(2gh2) = 4.1056 m/s

dV = V2 - V1 = +8.9556 m/s

a = dV/dt = 8.9556/0.091 = 98.4 m/s²

Therefore, the ball's acceleration while it is contact with the floor is 98.4m/s²

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3 years ago

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MAVERICK [17]

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3 years ago