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3 years ago

When rust forms on a piece of iron, what evidence do you have that a chemical reaction has taken place?

Physics

1 answer:

vfiekz [6]3 years ago

6 0

The rust is the product and evidence

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Convert 10 kilometers to feet.

ehidna [41]

Answer:

32,808.4 feet.

Explanation:

1 kilometer is equal to 3,280.84 feet.

3,280.84 feet × 10 feet = 32,808.4 feet

8 0

4 years ago

The magnitude J of the current density in a certain wire with a circular cross section of radius R = 2.11 mm is given by J = (3.

oksano4ka [1.4K]

Answer:

$i = 2.84 \times 10^{-3} A$

Explanation:

As we know that current density is ratio of current and area of the crossection

now we have

$J = \frac{di}{dA}$

so the current through the wire is given as

$i = \int J dA$

now we have

$i = \int_{0.921R}^R J dA$

here we have

$J = (3.25 \times 10^8)r^2$

now plug in the values in above equation

$i = \int_{0.921R}^R (3.25 \times 10^8)r^2 2\pi r dr$

now we have

$i = \int_{0.921R}^R 2\pi (3.25 \times 10^8)r^3 dr$

$i = (2.04 \times 10^9) \frac{r^4}{4}$

now plug in both limits as mentioned

$i = (2.04 \times 10^9)(\frac{R^4}{4} - \frac{(0.921R)^4}{4})$

$i = (2.04\times 10^9)(0.07 R^4)$

here R = 2.11 mm

$i = (2.04 \times 10^9)(0.07 (2.11 \times 10^{-3})^4)$

$i = 2.84 \times 10^{-3} A$

8 0

3 years ago

Different _______ of light through two separate mediums causes the bending of wave fronts associated with light rays.

trapecia [35]

It's between C. and D.

5 0

3 years ago

Read 2 more answers

Consult Multiple-Concept Example 9 to explore a model for solving this problem. A person pushes on a 63-kg refrigerator with a h

miskamm [114]

Answer:

a ) 270 N

b )413.65 N

Explanation:

weight of the refrigerator = reaction force ( R )

= mg

= 63 x 9.8

R = 617.4 N

Maximum friction possible

= coefficient of friction x R

= .67 X 617.4

= 413.65 N

When force 270 N is applied , due to friction, the body does not move .

The friction force adjusts itself to the external applied force to prevent the body to budge.

Hence the friction force acting in this situation = 270 N

b ) The maximum friction possible is 413.65 . If we apply a force equal to or exceeding 413.65 N , body will move. Hence 413.65 N is the answer.

4 0

3 years ago

How dangerous or painful is the recoil of a shotgun?

skelet666 [1.2K]

Answer:

If you’re going to be shooting a lot, get a surplus flak jacket. This isn’t a bulletproof vest, it just stops fragmentation or shrapnel. More importantly, it absorbs shock. You can fire a 12 gauge shotgun all day long and you won’t feel sore at all.

hope it helps

3 0

3 years ago