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4 0

If a bus starts a zero and then travels 10 miles north but then travels south 3.75 towards the starting point of zero, the displacement will be 10 - 3.75 = 7.5 miles

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What is common in elastic collision, inelastic collision and perfectly inelastic collision

Feliz [49]

Answer:

A perfectly elastic collision is defined as one in which there is no loss of kinetic energy in the collision. An inelastic collision is one in which part of the kinetic energy is changed to some other form of energy in the collision.

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3 years ago

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A cylinder that is 20 cm tall is filled with water. If a hole is made in the side of the cylinder 5 cm below the top level, how

lara31 [8.8K]

Answer:

See description

Explanation:

This is an example where we need Tornicelli's law, which states that the horizontal speed of a fluid that starts falling from an orifice is the same speed that an object acquires from free-falling.

$v = \sqrt{2gh}$

we are given:

$h_{cilinder} = 0.2 [m]\\h = 0.05 [m]\\d=0.15[m]$

the horizontal velocity of the water at the start is:

$v = \sqrt{2(9.8)(0.05)}=0.989949 [m/s]=1[m/s]$

now we need to find the time for the water drops to fall d:

as the gravity is the only force interacting with the water we have:

$y(t) = \frac{1}{2} g*t^2$

replace for y = d

$0.15 = \frac{1}{2} g*t^2=>t=\sqrt{\frac{2*0.15}{9.8}}=0.1749[s]$

now that we have t we notice that there are no horizontal forces interacting with the water, so the horizontal position is given by:

$x(t)=v*t$

Finally, we replace v and t:

$x(2.45) = 1*0.1749 = 0.1749 [m]=17.49[cm]$

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3 years ago

What is the primary reason that astronomers put telescopes and other instruments above Earth's atmosphere?

katrin [286]

The main reason as to why those telescopes that are located above the Earth's atmosphere is because the atmosphere absorbs infrared light which comes from the sun and this affects the viewing done by the astronomers. That is why, this is considered as a great disadvantage for those ground-based telescopes. The answer would be the last option.

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4 years ago

A 5-mm-thick stainless steel strip (k = 21 W/m·K, rho = 8000 kg/m3, and cp = 570 J/kg·K) is being heat treated as it moves throu

Snezhnost [94]

Answer:

1170 Kelvin/meter

Explanation:

See attached pictures.