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tia_tia [17]
3 years ago
15

two boys started runing stright to ward each other from two pionts 100m aparts.one run at speed of 4m/s and other at 6m/s.how fa

r are they from the slower one's starting point when they meet​
Physics
1 answer:
kodGreya [7K]3 years ago
6 0

Answer:

One boys rate is "r" and the other's is (r+10)

the distance they cover is 240 miles in 3 hours

3r + 3*(r+10) = 240

6r + 30 = 240

6r = 210

r = 35 mph and the faster car is

r + 10 = 45 mph

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here we know that electrostatic repulsion force is balanced by the gravitational force between them

so here force of attraction due to gravitation is given as

F_g = 1.98 \times 10^{20} N

here we can assume that both will have equal charge of magnitude "q"

now we have

1.98 \times 10^{20} = \frac{kq^2}{r^2}

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1.98 \times 10^{20} = (6.10 \times 10^{-8}) q^2

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q = 5.7 \times 10^{13} C

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3 years ago
Which best explains why the shape of a liquid can change?
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Describe what happens to the particles of a liquid, in terms of movement and kinetic energy, as it is cooled to its freezing poi
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3 years ago
Considerando que los coeficientes de dilatación de los siguientes metales son: hierro 11.7 x 10-6; plomo 27.3 x 10-6; cobre 16.7
Rasek [7]

Answer:

el plomo será el más largo

Explanation:

Dado que;

longitud inicial (l1) = 4m

Longitud final l2

aumento de temperatura (θ) = 10 ° C

Coeficiente de expansión lineal α

Ahora para el hierro;

α = 11,7 x 10-6

Desde;

l2-l / l1θ = α

l2 = α l1θ + l1

l2 = l1 (αθ + 1)

l2 = 4 ((11,7 x 10-6 * 10) + 1)

l2 = 4.00044 m

Para el plomo

l2 = 4 ((27,3 x 10-6 * 10) + 1)

l2 = 4,00109 m

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l2 = 4 ((16,7 x 10-6 * 10) + 1)

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Por lo tanto, el plomo será el más largo

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3 years ago
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