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3 years ago

A roller coaster is stationary at the top of a ramp.

Physics

1 answer:

lora16 [44]3 years ago

3 0

I think that the answer is B.

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A rear window defroster consists of a long, flat wire bonded to the inside surface of the window. When current passes through th

GenaCL600 [577]

Answer:

$\rho=1.8\times 10^{-8}\Omega.m$

Explanation:

Given:

width of the wire, $w=1.8\ mm=1.8\times 10^{-3}\ m$

thickness of the flat wire, $d=0.12\ mm=1.2\times 10^{-4}$

length of the wire, $l=12\ m$

voltage across the wire, $V=12\ V$

current through the wire, $I=12\ A$

Now the net resistance of the wire:

using ohm's law

$R=\frac{V}{I}$

$R=\frac{12}{12}$

$R=1\ \Omega$

We have the relation between the resistivity and the resistance as:

$R=\rho.\frac{l}{a}$

where:

a = cross sectional area of the wire

$\rho =$ resistivity of the wire material

$1=\rho\times \frac{12}{1.8\times 10^{-3}\times 1.2\times 10^{-4}}$

$\rho=1.8\times 10^{-8}\Omega.m$

4 0

3 years ago

What was the MAIN purpose of the International Cotton Expositions held in Atlanta

KengaRu [80]

Answer:

To foster trade between southern states and South American nations. Also to show the products and facilities to share in Europe & rest of nation.

4 0

3 years ago

Which of the following has zeros that are not significant?

guapka [62]

10.0 J

if it was 10.01 it would be significant, but its 10.0 which makes it a whole number

4 0

3 years ago

Use the picture to answer the question.

Vesnalui [34]

Answer:

the bowling ball is red, it has three holes, and it is striped

Explanation:

6 0

3 years ago

Read 2 more answers

How would you find the speed of a person who walked

Alex Ar [27]

Answer:

v = 1.25 m/s

Explanation:

We have,

Distance covered by a person is 10 meters

Time taken by him to cover that distance is 8 seconds.

If we want to find the speed of a person, we must know distance covered by it and taken. In this case, we know both distance and time. His speed is given by :

$v=\dfrac{d}{t}\\\\v=\dfrac{10\ m}{8\ s}\\\\v=1.25\ m/s$

So, the speed of the person is 1.25 m/s.

4 0

3 years ago