3 years ago

Help Me !! I have an exam.

Physics

2 answers:

kirill115 [55]3 years ago

6 0

Positive i believe:)))

Mumz [18]3 years ago

5 0

Answer:

I think positive...

.....

......

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A metal wire of resistance R is cut into five equal pieces that are then placed together side by side to form a new cable with a

Alina [70]

Answer:

R / 25

Explanation:

Let the initial length of the wire is L and its resistance is R.

Now the length is cut into 5 equal parts.

The resistance of a wire is directly proportional to the length of the wire, thus, the resistance of each portion of the wire is R/5.

Now the five pieces are connected in parallel combination, the equivalent resistance is

$\frac{1}{R_{eq}}=\frac{5}{R}+\frac{5}{R}+\frac{5}{R}+\frac{5}{R}+\frac{5}{R}$

$R_{eq}=\frac{R}{25}$

Thus, the resistance of the new cable is R / 25.

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3 years ago

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Answer:

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4 years ago

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What is the speed of a ball that is attached to a string and swings in a horizontal circle of radius 2.0 m with the central acce

Ira Lisetskai [31]

Answer:

5.48 m/s.

Explanation:

Use the formula a=v^2/r.

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3 years ago

The air is less dense at higher elevations, so skydivers reach a high terminal speed. The highest recorded speed for a skydiver

swat32

Answer:

the terminal velocity v_t= 202.96 m/s≅203 m/s

Explanation:

The expression for the terminal velocity

$v_t= \sqrt{\frac{2mg}{\rho AC_d} }$

here, C_d is the drag coefficient for the cylinder is 1.15

The surface density of the air at 20°C is

ρ_surface = 1.2041 kg/m^3

the density of air at an altitude of 39000 m

ρ= 4.3/100×39000 = 0.05177 kg/m^3

now substitute these values in equation above

we get

$v_t= \sqrt{\frac{2\times90\times9.81}{0.05177\times0.72\times1.15} }$

v_t= 202.96 m/s≅203 m/s

the terminal velocity v_t= 202.96 m/s≅203 m/s

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4 years ago

List 3 ways that living creatures use proteins

ANTONII [103]

3 ways would be they are used for movement, form structure and carry out reactions, processes, and cells

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4 years ago