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yarga [219]
3 years ago
9

Xavier is roller skating at 14 km/h and tosses a set of ke relative to the ground is km/h.

Physics
1 answer:
Liula [17]3 years ago
7 0

Complete question :

Xavier is roller skating at 14 km/h and tosses a set of keys forward on the ground at 8 km/h. The speed of the keys relative to the ground is km/h.

Answer:

22 km/hr

Explanation:

Speed of keys with respect to ground ; V(k - g)

Speed of keys with respect to skater ; V(k - s)

Speed of skater with respect to ground ; V(s - g)

V(s - g) = 8 km/hr

V(k - s) = 14 km/hr

Substituting the values into the equation :

V(k - g) = V(s - g) + V(k - s)

V(k - g) = 8km/hr + 14km/hr

V(k - g) = 22 km/hr

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The magnitude of the electric field at the third vertex of the triangle is determined as zero.

<h3>Electric field at the third vertex of the triangle </h3>

The electric field at the third vertex of the equilateral triangle due to the other charges placed on the first and second vertices is calculated as follows;

E = E(13) + E(23)

E = (kq₁)/r² + (kq₂)/r²

where;

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E =  (kq₁)/r² - (kq₂)/r²

E = 0

Thus, the magnitude of the electric field at the third vertex of the triangle is determined as zero.

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5 0
2 years ago
a transmission-line cable, of length 3 km, consists of 19 strands of identical copper conductors, each 1.5 mm in diameter. becau
Ivan

the resistance of the cable is 582.9 ohms

we are given the length of the cable which is  3 km,  of  1.5 mm in, the diameter  and resistivity of copper which is 1.72 m

The formula  we are referring to for calculating the resistance of the  cable is

R = ρl/A.

As there are 19 strands of copper conductors, so the resistance will be

R = 19( ρl/A)

Here  ρ is the resisitivity =  1.72 , l is the length  = 3(1+0.05)*10³3= 3150 m

A=pie/4(1.5 x 10⁻³)^2 =1.766 x 10⁻⁶ =1.766 x 10^-6

Substituting the values in the formula  we  get

R = 19 ( 1.72*3150 )/1.766 x 10⁻⁶

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6 0
1 year ago
Bird bones have air pockets in them to reduce their weight—this also gives them an average density significantly less thanthat o
snow_tiger [21]

Answer:

41.4 g

41.4 cm³

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\rho = Density of water = 1 g/cm³

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Mass of water displaced is 41.4 g

Density is given by

\rho=\dfrac{m}{v}\\\Rightarrow v=\dfrac{m}{\rho}\\\Rightarrow v=\dfrac{41.4}{1}\\\Rightarrow v=41.4\ cm^3

So, volume of bone is 41.4 cm³

Average density of the bird is given by

\rho=\dfrac{45}{41.4}\\\Rightarrow \rho=1.08695\ g/cm^3

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3 0
3 years ago
A dairy farmer notices that a circular water trough near the barn has become rusty and now has a hole near the base. The hole is
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Answer:

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Why earth have gravity​
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Answer:

Because it has mass.

Explanation:

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