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3 years ago

Galileo:

Physics

2 answers:

miv72 [106K]3 years ago

7 0

Answer:

D.) all of the above

Explanation:

Galileo was the first person to point the telescope to sky and observe celestial bodies closely. He discovered craters on moon and four moons of Jupiter.

He also supported heliocentric model of the solar system given by Copernicus. He observed phases of Venus which are similar to phases of moon. These could be understood only if Venus revolved about the sun and not earth. This was the evidence which disproved geocentric model of Ptolemy and Aristotle.

Thus, correct option is D.

Natasha2012 [34]3 years ago

6 0

B:supported Copernicus heliocentric theory

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4 years ago

The handle of a metal spoon warms up when it is placed in a hot bowl of soup because of

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conduction because energy is being conducted throughout the spoon

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3 years ago

Two children push on heavy crate that rests on a basement floor. one pushes horizontally with a force of 150 N and the other pus

Makovka662 [10]

The force of friction is 330 N

Explanation:

We can solve this problem by applying Newton's second law of motion, which states that the net force acting on an object is equal to the product between the mass of the object and its acceleration:

$sum F = ma$

where

$\sum F$ is the net force

m is the mass

a is the acceleration

For the crate in this problem, we have 3 forces acting on it:

- The force applied by the 1st child, $F_1 = 150 N$ forward

- The force applied by the 2nd child, $F_2 = 180 N$

- The force of friction, $F_f$ , acting backward

So the net force is

$\sum F = F_1 + F_2 - F_f$

We also know that the crate remains stationary, which means that its acceleration is zero:

a = 0

Therefore, we can rewrite Newton's second law as

$F_1 + F_2 - F_f = 0$

From which we find

$F_f = F_1+F_2 = 150 + 180 =330 N$

Learn more about friction and Newton's second law:

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3 years ago

A basketball has a mass of 601 g. Moving to the right and heading downward at an angle of 29 degree to the vertical, it hits the

olga55 [171]

Answer:

Change in momentum, $\Delta p=6.3\ kg-m/s$

Explanation:

It is given that,

Mass of the basketball, m = 601 g = 0.601 kg

The basketball makes an angle of 29 degrees to the vertical, it hits the floor with a speed, v = 6 m/s

It bounces up with the same speed, again moving to the right at an angle of 29 degree to the vertical. We need to find the change in momentum. It is given by :

$\Delta p=mv\ cos\theta-(-mv\ cos\theta)$

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So, the change in momentum of the basketball is 6.3 kg-m/s. Hence, this is the required solution.

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4 years ago