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3 years ago

Food and electricity are the examples of_________________

Physics

2 answers:

mash [69]3 years ago

4 0

Answer:

sources of energy

lisov135 [29]3 years ago

4 0

Answer:

energy

Explanation:

hope this is the right answer

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A second-grade teacher dropped a box of paper clips and they scattered all over the floor. She then asked her students, "Why wil

Yuliya22 [10]

The magnet will be a useful tool to pick the paper clips because the magnet can attract the paper clips.

<h3>Attraction of magnets</h3>

The like poles of magnets repel while unlike poles of magnets attracts. Magnets attracts irons or metallic materials.

The paper clips are mettalic or made of iron and hence the magnet will attract them.

There we can conclude that the magnet will be a useful tool to pick the paper clips because the magnet can attract the paper clips and will help to gather them together for easy picking.

Learn more about magnets here: brainly.com/question/14997726

8 0

2 years ago

61. A physics student has a single-occupancy dorm room. The student has a small refrigerator that runs with a current of 3.00 A

Mademuasel [1]

Answer:

Part a)

$percentage = 21.3$ %

Part b)

$percentage = 2.13 \times 10^{-5}$ %

Explanation:

As we know that total power used in the room is given as

$P = P_1 + P_2 + P_3 + P_4$

here we have

$P_1 = (110)(3) = 330 W$

$P_2 = 100 W$

$P_3 = 60 W$

$P_4 = 3 W$

$P = 330 + 100 + 60 + 3$

$P = 493 W$

Part a)

Since power supply is at 110 Volt so the current obtained from this supply is given as

$110\times i = 493$

$i = 4.48 A$

now resistance of transmission line

$R = \frac{\rho L}{A}$

$R = \frac{(2.8 \times 10^{-8})(10\times 10^3)}{\pi(4.126\times 10^{-3})^2}$

$R = 5.23 \ohm$

now power loss in line is given as

$P = i^2 R$

$P = (4.48)^2(5.23)$

$P = 105 W$

Now percentage loss is given as

$percentage = \frac{loss}{supply} \times 100$

$percentage = \frac{105}{493} \times 100$

$percentage = 21.3$ %

Part b)

now same power must have been supplied from the supply station at 110 kV, so we have

$110 \times 10^3 (i ) = 493$

$i = 4.48\times 10^{-3} A$

now power loss in line is given as

$P = i^2 R$

$P = (4.48 \times 10^{-3})^2(5.23)$

$P = 1.05 \times 10^{-4} W$

Now percentage loss is given as

$percentage = \frac{loss}{supply} \times 100$

$percentage = \frac{1.05 \times 10^{-4}}{493} \times 100$

$percentage = 2.13 \times 10^{-5}$ %

6 0

3 years ago

13. A 50 kg cart is attached to a 75 kg donkey. Two men, each using 100 N of force, try to pull the

Arturiano [62]

F1=-100N
F2=500N

$\\ \sf\longmapsto F_{net}=F_1+F_2$

$\\ \sf\longmapsto F_{net}=-100+500$

$\\ \sf\longmapsto F_{net}=400N$

7 0

3 years ago

2.when sugar or another substance is dissolved in water, it disappears from view and forms a homogeneous mixture with the water,

bekas [8.4K]

You cant really tell when it is dissolved

3 0

3 years ago

A rectangle has an area measuring 1350 square centimeters. Its length and width are whole numbers of centimeters. What are the p

Aleks04 [339]

The smallest perimeter of the rectangle is of value 150 cm.

Given:

The area of the rectangle, A = 1350 cm²

Calculation:

Let the length of the rectangle be 'x'

the breadth of the rectangle be 'y'

We know that the area of a rectangle is given as:

A = (x) × (y)

Applying values in the above equation we get:

xy = 1350 cm²

Factorizing the value of 1350, the possible values of length and breadth of the rectangle is as listed below:

x (cm) y (cm)

1350 × 1

675 × 2

450 × 3

270 × 5

225 × 6

150 × 9

135 × 10

90 × 15

75 × 18

54 × 25

50 × 27

45 × 30 (least possible value)

Thus, the smallest perimeter of the rectangle can be calculated as:

P = 2 (x + y)

= 2 (45 + 30)

= 150 cm

Therefore, the smallest perimeter that the rectangle will have is 150 cm.

Learn more about factorization here:

<u>brainly.com/question/9231261</u>

#SPJ4

7 0

2 years ago

Food and electricity are the examples of_________________​

Food and electricity are the examples of_________________