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Vera_Pavlovna [14]
3 years ago
14

A 7.0kg skydiver is descending with a constant velocity

Physics
1 answer:
Pavel [41]3 years ago
4 0

Answer:

Air resistance: 68.6 N

Explanation:

For the skydiver falling down, there are two forces acting on him:

- The force of gravity, of magnitude

W=mg

where

m = 7.0 kg is the mass of the skydiver

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

This force acts in the downward direction

- The air resistance, R, in the upward direction

So the net force on the skydiver is:

\sum F=mg-R

According to Newton's second law of motion, the net force is also equal to mass times acceleration:

\sum F=ma

However, in this problem the skydiver is falling at constant velocity, so his acceleration is zero:

a=0

Therefore, the net force is zero:

\sum F=0

And so we can find the magnitude of the air resistance, which is equal to the weigth of the skydiver:

mg-R=0\\R=mg=(7.0)(9.8)=68.6 N

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A circuit is constructed with six resistors and two batteries as shown. the battery voltages are v1 = 18 v and v2 = 12 v. the po
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V4=9.197v

Explanation:

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Sally and Juan’s science teacher has directed the class to build a paper airplane. The challenge is to build an airplane that fl
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A house brick has a volume of 1900 cm³ and a weight in air of 80N.What is its apparent weight in water?The density of water is 1
Shtirlitz [24]

Answer:

61 N

Explanation:

We'll begin by calculating the mass of the brick when placed in water. This can be obtained as follow:

Volume of brick = 1900 cm³

Density of water = 1 g/cm³

Mass of brick in water =…?

Density = mass / volume

1 = mass of brick in water / 1900

Cross multiply

Mass of brick in water = 1 × 1900

Mass of brick in water = 1900 g

Next, we shall convert 1900 g to Kg.

1000 g = 1 Kg

Therefore,

1900 g = 1900 g × 1 Kg / 1000 g

1900 g = 1.9 Kg

Next, we shall determine the weight in water. This can be obtained as follow:

Mass (m) = 1.9 Kg

Acceleration due to gravity (g) = 10 m/s²

Weight (W) =?

W = m × g

W = 1.9 × 10

W = 19 N

Thus, the weight of the brick in water is 19 N.

Finally, we shall determine the apparent weight of the brick in water. This can be obtained as follow:

Weight in air = 80 N

Weight in water = 19 N

Apparent weight =?

Apparent weight = weight in air – weight in water

Apparent weight = 80 – 19

Apparent weight = 61 N

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3 years ago
Sara walks part way around a swimming pool. She walks 50 yards north, then
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Answer:

20 Yards

Explanation:

|---20----|

|            |

| 50       |50

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Start      End

Total displacement(D)  20 yards (East).

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