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3 years ago

14

The outer shell electrons in metals are not tightly bound to the nuclei of their atoms they are free to roam throughout the mate

rial moving from atom to atom these materials are good

1 answer:

Yuliya22 [10]3 years ago

6 0

The pumps which supplies energy to move the water from the ground to a high elevation. The charges that flow throughout the wires.

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A rectangular pool has a volume of 375 m3. the pool is 10 m long and 5 m wide. how deep is the pool? 7.5 m 3,750 m 75 m

likoan [24]

V=L•W•H. Sub in what you know: 375=10•5•H. Simplify: 375=50H. Divide by 50: 375/50=H. H=7.5 :)

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3 years ago

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What is energy? a change that appears in an object when force is applied the property of a body that gives it mass the amount of

alexandr402 [8]

<span>Energy exists as light, heat, sound, mass, moving objects, gravity, fuel, chemicals, and electricity.</span>

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3 years ago

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Two Force one of 12 Newton and another 24 Newton acts at 90 degree with each other find the resultant of two force and its direc

Leona [35]

Answer:

Fr = 26.83 [N]

Explanation:

To solve this problem we must use the Pythagorean theorem, since the forces are vector quantities, that is, they have magnitude and density. Therefore the Pythagorean theorem is suitable for the solution of this problem.

$F_{r}=\sqrt{(12)^{2}+(24)^{2} } \\F_{r}=26.83[N]$

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3 years ago

A 75 kg window cleaner uses a 10 kg ladder that is 5.0 m long. He places one end on the ground 2.5 m from a wall, rests the uppe

hjlf

Solution :

Given : Mass of ladder = 10 kg

Length of ladder = 5 m

Weight of window cleaner = 75 kg

a). Now equate the torque about the lowermost point of the ladder is given by :

$=10 \times 9.8 \times \frac{2.5}{2} + 75 \times 9.8 \times \frac{3}{5} \times 2.5 = N \times \sqrt{5^2 - 2.5^2}$

Here, N = normal force that the glass exerts on the ladder

Therefore, $N = 282.9 \ N$

= 280 N (in 2 significant figures)

b). Equate the forces along horizontal direction,

The horizontal component of the friction, $F_x = N = 282.9 \ N$

The vertical component of the friction, $F_y = (10+75) \times 9.8$

= 833 N

Therefore, the net frictional force, $F = \sqrt{F_x^2+F_y^2}$

$F = \sqrt{(282.9)^2+(833)^2}$

= 879.7 N

= 880 N (in 2 significant figures)

c). The angle the forces makes $= \tan \frac{833}{282.9}$

$= 71.2 ^\circ$

Therefore in 2 significant figures = $71 ^\circ$

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3 years ago

Differentiate convection and conduction class 7

BARSIC [14]

Answer:

While conduction is the transfer of heat energy by direct contact, convection is the movement of heat by actual motion of matter

Explanation:

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3 years ago