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3 years ago

13

When powdered iron is left exposed to the air, it rusts. explain why the mass of the rust is greater than the mass of the powder

ed iron?

1 answer:

Stells [14]3 years ago

7 0

There is more surface area to rust even though microscopic. which is why there is more rust than iron

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Compare and contrast the velocity at which X-rays and radio waves travel

posledela

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Two balloons are charged with an identical quantity and type of charge: -6.25 x 10-6 C. They are held apart at a separation dist

steposvetlana [31]

Answer:

The electric force between them is 878.9 N

Explanation:

Given:

Identical charge $q = -6.25 \times 10^{-6}$ C

Separation between two charges $r = 0.02$ m

For finding the electrical force,

According to the coulomb's law

$F = \frac{k q^{2} }{r^{2} }$

Here, force between two balloons are repulsive because both charges are same.

Where $k = 9 \times 10^{9}$

$F = \frac{9 \times 10^{9} \times (-6.25 \times 10^{-6} )^{2} }{4 \times 10^{-4} }$

$F = 878.9$ N

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3 years ago

For the tread on your car tires, which is greater: the tangential acceleration when going from rest to highway speed as quickly

natita [175]

Answer:

The centripetal acceleration at highway speed is greater.

Explanation:

We assume the motion of the car is uniformly accelerated. Let the highway speed be v.

By the equation of motion,

$v=u+at$

$a=\dfrac{v-u}{t}$

u is the initial velocity, a is acceleration and t is time

Because the car starts from rest, u = 0.

$a_T=\dfrac{v}{t}$

This is the tangential acceleration of the thread of the tire.

The centripetal acceleration is given by

$a_C=\dfrac{v^2}{r}$

r is the radius of the tire.

Comparing both accelerations and applying commonly expected values to r and t, the centripetal acceleration is seen to be greater. The radius of a tyre is, on the average, less than 0.4 m. Then the centripetal acceleration is about

$a_C=\dfrac{v^2}{0.3}=2.5v^2$

The tangential acceleration can only be greater in the near impossible condition that the time to attain the speed is on the order of microseconds.

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3 years ago

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The answer is 5.0 m/s

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