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4vir4ik [10]
3 years ago
13

Aluminium is metal or metalloid

Physics
2 answers:
Pie3 years ago
7 0

Answer:

Aluminum-(Al) is a metal

WARRIOR [948]3 years ago
4 0

Answer:

Aluminium is just on the metal side of the border between metals and metalloids, so it is not considered to be a metalloid

Explanation:

it is a metal

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a 60g tennis ball travelling at 30m/s hi a wall and bounce back at 20m/s.calculate (a)momentum of the ball before impact (b)mome
frez [133]

Explanation:

the formula for momentum is denoted by p=mv where p is momentum, m is mass and v is velocity. thus, the velocity before impact would be 0.060 x 30 = 1.8 kg/ms

the second one would just be 0.060 x 20 0.72kg/ms

I'm not 100 percent sure this is correct but yeah

6 0
3 years ago
What distance separates Earth and the Sun? A 300,000 km per second B Eight light-minutes C 149 million light-seconds D One light
lina2011 [118]

Answer:

B Eight light-minutes

Explanation:

In the case when the distance separated earth and the sun so here we orbit the sun for a 150 million km distance and the light moves would be 300,000 kilometers per second

Now divide this

= 150 million ÷ 300,000 kilometers per second

= 500 seconds

This 500 seconds represent 8 minutes and 20 seconds

Hence, option B is correct

5 0
3 years ago
Read 2 more answers
You are helping your friend move a new refrigerator into his kitchen. You apply a horizontal force of 252 N in the negative x di
pentagon [3]

(a) 252 N, opposite to the applied force

There are two forces acting on the refrigerator in the horizontal direction:

- the pushing force of 252 N, F, forward

- the frictional force, Ff, pulling backward

In this case, the refrigerator is not moving: this means that its acceleration is zero. According to Newton's second law, this also means that the net force acting on the refrigerator is also zero:

\sum F = ma = 0

So we have

F-F_f = 0

which means that the frictional force is equal in magnitude to the pushing force:

F_f = F = 252 N

and the direction is opposite to the pushing force.

(b) 334.8 N

The force that must be applied to the refrigerator to make it moving is equal to the maximum force of friction, which is given by:

F_{max} = \mu mg

where

\mu = 0.61 is the coefficient of static friction

m = 56 kg is the mass of the refrigerator

g = 9.8 m/s^2 is the acceleration of gravity

Substituting:

F_max = (0.61)(56 kg)(9.8 m/s^2)=334.8 N

6 0
3 years ago
How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 3.33×10−21 n
qwelly [4]

Answer:

The number of excess electrons on each sphere is 759

Explanation:

Given that,

distance , d = 20 cm

                    = 0.20 m

let the number of electrons is n  

Electric force (F) = k × (n × e)² /d²

3.33 × 10^{-21} = 9 × 10^{9} × (n × 1.602 × 10^{-19})² /0.2²

solving for n

n = 759

4 0
3 years ago
A horizontal pipe has varying cross-section, with one section having a diameter of 5.5
bekas [8.4K]

Answer:

  1. 3 is diameater

Explanation:

2.0 is radius

5 0
2 years ago
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