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3 years ago

What does a polar molecule mean?

1 answer:

5 0

Answer: A polar molecule is a chemical species in which the distribution of electrons between the covalently bonded atoms is not even. Polarity is a description of how different the electrical poles of a molecule are. ... If the difference is considerable, a polar bond will form and one atom will attract more electrons

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Newton's first law of motion states that an object at rest will stay at rest unless acted

Ludmilka [50]

Answer:

All are examples

Explanation:

Football acted upon by the force of the foot

Bicycle acted on by imbalanced force of gravity

Friction of dirt on player slows his run.

stick and water acted on by imbalanced force of gravity

7 0

3 years ago

Convert 60 miles/hour to m/s (1.6km = 1mile; 1000m = 1km)

Sedaia [141]

60 miles / hr

= 60 * 1.6 * 1000 m / 60 * 60 s

= 96000 m / 3600 s

= 26.67 m / s

8 0

3 years ago

Câu 20: Chọn câu sai:

Deffense [45]

Answer:

Explanation:

3 0

3 years ago

special metal hangers or stirrips called joist hangers are used when joist must be _____ the bottom of the grider or beam

djyliett [7]

Answer:

Special metal hangers or stirrups called joist hangers are used when joist must be flush with the bottom of the girder or beam.

Explanation:

A joist hanger also known as a beam hanger is a mechanical device which is used to fasten joists and rafters.
The rafters are the carried members to beams and headers are the carrying members.

Thus, special metal hangers or stirrups called joist hangers are used when joist must be flush with the bottom of the girder or beam.

Learn more about construction here:

brainly.com/question/14428327

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7 0

1 year ago

Earth orbits once around the sun every 365.25 days at an average radius of 1.5X10^11 m. Earth's mass is 6X10^24 kg. What distanc

Katyanochek1 [597]

(a) The distance the Earth travels every year is the perimeter of the orbit; since we have the average radius of the orbit, we can calculate the perimeter:
$d=2\pi r = 2 \pi (1.5 \cdot 10^{11}m)=9.4 \cdot 10^{11}m$

(b) The average centripetal acceleration is given by
$a_c = \frac{v^2}{r}$
where v is the average speed of the Earth, that we can find by dividing the distance covered by the Earth in one year (=the perimeter of the orbit) by the the time corresponding to 1 year:
t=1 year=365.25 days=3.2 \cdot 10^7 s
So the velocity is:
$v= \frac{d}{t}= \frac{9.4 \cdot 10^{11}m}{3.2 \cdot 10^7 s} =2.94 \cdot 10^4 m/s$
And so the centripetal acceleration is:
$a_c = \frac{v^2}{r}= \frac{(2.94 \cdot 10^4 m/s)^2}{9.4 \cdot 10^{11}m} =9.2 \cdot 10^{-4} m/s^2$

6 0

3 years ago