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3 years ago

6

What objects did Archimedes use to test the density of the gold crown? How Can a modern investigator identify the elements in pa

int

1 answer:

alekssr [168]3 years ago

6 0

:/........?????????,,,??????

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An aircraft travels a distance of 50km in a straight line

Juliette [100K]

Answer:

200 m/s

Explanation:

v = distance / time = 50km/250s = 50000m/250s = 200 m/s

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2 years ago

A wire with a length of 150 m and a radius of 0.15 mm carries a current with a uniform current density of 2.8 x 10^7A/m^2. The c

Mrac [35]

Answer:

The current is 2.0 A.

(A) is correct option.

Explanation:

Given that,

Length = 150 m

Radius = 0.15 mm

Current density $J=2.8\times10^{7}\ A/m^2$

We need to calculate the current

Using formula of current density

$J = \dfrac{I}{A}$

$I=J\timesA$

Where, J = current density

A = area

I = current

Put the value into the formula

$I=2.8\times10^{7}\times\pi\times(0.15\times10^{-3})^2$

$I=1.97=2.0\ A$

Hence, The current is 2.0 A.

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3 years ago

When you power an electromagnet with 3 batteries, what variable decreases as a result of removing one of those batteries.

Snezhnost [94]

Answer:

The strength of the magnetic field decreases as a result of removing one of those batteries.

Hope this helps!

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3 years ago

Does water expand more as the temperature drops even more below 0 deg? I am worried about the coolant in my rad. as the temp.is

alex41 [277]

Water is, indeed, an exception. Normally when temperature drops, material shrinks. Water doesn't, water expands instead.

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3 years ago

Which of the following is an obstacle to creating computer-based models for tracking a hurricane?

AnnZ [28]

Forecasters must consider a large number of variables that affect the path of the storm.
This makes it difficult to create computer-based models because all of these variables are hard to incorporate.

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3 years ago

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