4 years ago

Does sound travel much faster than light ?

Physics

1 answer:

Kitty [74]4 years ago

4 0

Answer:

nothing travels faster than light

Example:

You’ll always see lightning before you hear it, because typically lightning will be a mile away, two miles away.

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An 8.0 g bullet is fired from a gun at 120 m/s into a 2.0 kg block of wood sitting on a fence post. If the bullet hits the wood

nydimaria [60]

Answer:

$v = 0.478 m/s$

Explanation:

As we know that bullet strike the block and fix in it

so here if bullet and box is taken as a system then there is no external force on it

so here the initial momentum of bullet and block must be equal to final momentum of bullet and block

so here we have

$m_1v_{1i} + m_2v_{2i} = m_1v + m_2v$

now we have

$m_1 = 8 g$

$v_1 = 120 m/s$

$m_2 = 2kg$

$v_{2i} = 0$

now from above equation we have

$(0.008)(120) + 2(0) = (0.008)v + 2v$

$v = 0.478 m/s$

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4 years ago

Why do some elements on the periodic chart have three letters as a symbol, all starting with a U?

TiliK225 [7]

These elements are synthetic elements in that they do not occur naturally and only as a result of being made in a scientific laboratory. Elements are given the Uu(x) name as a placeholder until IUPAC (International Union of Pure and Applied Chemistry) approves an actual name for the element. This is under a process called "systematic element naming" (feel free to give it a google). The IUPAC grants the discoverers of the new element the right to suggest the name for that new element, so you may find that those weird Uu(x) elements have an actual name soon!!

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4 years ago

You stand on a spring scale on the floor of an elevator. Of the following, the scale shows the highest reading when the elevator

Virty [35]

Answer:

move upward with increasing speed

I draw fbd diagram , see in figure

when lift going upward -

F - mg = ma

f = m( a + g)

scale so highest reading

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4 years ago

Short-term memory is active, while long-term memory is:

Afina-wow [57]

Answer:

the answer is b. reflective

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3 years ago

The landing gear of an airplane can be idealized as the spring-mass-damper system shown in fig. 3.52. if the runway surface is d

Serhud [2]

The land of airplane gear of an airplane can be idealized as the spring-mass-damper system shown in fig. 3.52. if the runway surface is described

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4 years ago