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3 years ago

Which scientist was the first one to use a telescope

Physics

1 answer:

NISA [10]3 years ago

6 0

Answer:

Galileo Galilei developed the first ever telescope

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Suppose you buy some inflated party balloons that are at room temperature (about 20°C). What will happen to those balloons if yo

Zina [86]

The balloons will begin to shrink or deflate.

7 0

3 years ago

A rock falls from a vertical cliff that is 4.0 m tall and experiences no significant air resistance as it falls. At what speed w

Zinaida [17]

Answer:

v = 6.3 m/s

Explanation:

Since no significant air resistance exists, total mechanical energy must be kept constant at any time.
At the top of the cliff, all the energy is gravitational potential energy, as follows:

$E_{i} = K_{i} + U_{i} = 0 + U_{i} (1)$

If we choose the ground level as our zero reference level for the gravitational potential energy, Ui is simply:
Ui = m*g*h (1)
At any height, the sum of the kinetic and the gravitational potential energy must be equal to (1).
We know from the question, that at the point of interest, both types of energies must be equal each other, so we can write the following expression from (1):

$m*g* h = 2*\frac{1}{2}*m*v^{2} (2)$

Dividing both sides by m, simplifying, and solving for v, we get:

$v = \sqrt{g*h} =\sqrt{9.8m/s2*4.0m} = 6.26 m/s (3)$

v = 6.3 m/s (with two significative figures)

8 0

3 years ago

A 0.5kg ball of clay originally moving at 6 m/s strikes a wall and comes to rest in 0.25s, what is the magnitude of the impulse

Alex787 [66]

Answer:

C I did USA testprep

Explanation:

5 0

3 years ago

Must physics always be explained by math?

cluponka [151]

Answer:

Because Physics is mainly composited of math

Explanation:

If you really think about it the only way any science works is off maths, whether that be measuring the amount of NaOH to put into a solution or determening the amount of sugar you want in a cake it all relys on maths

5 0

3 years ago

An engineer is designing a spring to be placed at the bottom of an elevator shaft. If the elevator cable should happen to break

mamaluj [8]

Answer:

Value that the spring constant k = 12Mg / h

Explanation:

According to 2nd law of Newton:

upward force of the spring= F

The weight of the elevator W = mg

F = Mg = M(5g)

==> F =6Mg.

As the spring is compressed to its maximum distance ie s,the maximum upward acceleration comes just , Hence

F =ks = 6Mg

==> s = 6Mg/k

We have gravitational potential energy turning into elastic potential of the spring as the elevator starts at the top some distance h from the spring, and undergoes a total change in height equal to h + s, so:

Mg(h+s) = 1/2ks2

And plugging in our expression for s:

Mg(h+6Mg/k)= 1/2k(6Mg / k)2

gh + 6M2g2/k = 1/2k(36M2g2 /k2)

Mgh +6M2g2/k = 1/2k(36M2g2 /k2)

gh + 6Mg2/k = 18Mg2 / k

gh = 12Mg2 / k

h = 12Mg / k

k = 12Mg / h

7 0

4 years ago

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Which scientist was the first one to use a telescope​

Which scientist was the first one to use a telescope