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andreev551 [17]
3 years ago
7

one group of atoms on the periodic tables are known as "noble gases". why have they been given this name?​

Physics
1 answer:
maria [59]3 years ago
8 0
This group is called “noble gases” because they do not react with other elements. This is because they have a full valence shell.
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A U-shaped tube, open to the air on both ends, contains mercury. Water is poured into the left arm until the water column is 10.
Masja [62]

Answer:

0.368 cm

Explanation:

x = distance by which the mercury rise

d = depth of the water = 10 cm = 0.10 m

ρ = density of water = 1000 kgm⁻³

ρ' = density of mercury = 13600 kgm⁻³

P₀ = atmospheric pressure

Using equilibrium of pressure on both side

P₀ + ρ g d = P₀ + ρ' g (2x)

(1000) (0.10) = (13600) (2x)

x = 0.00368 m

x = 0.368 cm

8 0
2 years ago
What happens when a boxer doesn't make weight?
ryzh [129]
They would just have to box in a higher weight class
6 0
3 years ago
A ball that has a mechanical energy of 65 J has 12 J of kinetic energy. The ball has
bulgar [2K]

Answer:

The ball has a potential energy of 53 J.

Explanation:

Mechanical energy, E = Kinetic energy + Potential energy

E = K.E + P.E

65 = 12 + P.E

P.E = 65 – 12

P.E = 53 J

Therefore the potential energy of the ball is 53 J

8 0
3 years ago
An object moves from point A to B to C to D and finally to A
Nataly [62]

here's the solution,

The <em>radius</em> of the circle =<u> 3 km</u>

distance covered = <em>circumference</em> of the circle,

So, Circumference :

=》

2\pi r

=》

2 \times 3.14 \times 3

=》

18.84

(a). Distance covered by moving object is 18.84 km

(b). 0 km

now, Displacement of the object is 0 km, because displacement is the shortest distance from stating point to the destination, but the object returns back to the starting point, hence magnitude of displacement is 0.

5 0
3 years ago
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
2 years ago
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