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3 years ago

PLSSSS HELPPPP PLSSSS 25 POINTS PLS I REALLY NEED THIS AND GET THEM RIGHT SO PLS DONT ANSWER IF U DONT KNOW

Physics

2 answers:

denis23 [38]3 years ago

4 0

Answer:

1- C 2-B 3-B - these are ur best answers

Explanation:

cupoosta [38]3 years ago

3 0

Answer:

1. C(bone structure)

2. B (Common ancestor)

3.D (DNA)

Explanation:

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Can you check this? Samantha swam upstream for some distance in one hour. She then swam downstream the same river for the same d

ElenaW [278]

So her speed in still water will be 6mph :)

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3 years ago

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If is the current density and is a vector element of area then the integral over an area represents:Group of answer choicesthe r

34kurt

Answer:

The average current density at the position of the area.

Explanation:

Current density is the vector whose magnitude is electric current in the cross sectional area. Current density is vector quantity which is measured in amperes. The average current density is dependent on the electric current flow. It has perpendicular direction of flow and scalar magnitude.

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3 years ago

A steel column is 3 m long and 0.4 m diameter. It carries a load of 50 MN so that 5.967 mm is elongates more. Find the modulus o

Alex787 [66]

Answer:

$E=2.0*10^{11}N/m^{2}$

Explanation:

<u>Relation between stress and Force:</u>

$\sigma=\frac{F}{A}=\frac{F}{\pi*d^{2}/4}$

<u>Relation between stress and strain:</u>

Young's modulus is defined by the ratio of longitudinal stress σ , to the longitudinal strain ε:

$E=\frac{\sigma}{\epsilon}$

$\epsilon=\frac{\Delta l}{l}$

So:

$E=\frac{F*l}{\pi*d^{2}/4*\Delta l}=\frac{50*10^{6}*3}{\pi*(0.4^{2}/4)*5.967*10^{-3}}=2*10^{11}N/m^2$

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3 years ago

Pedro picked up and held a cube of ice in his hand and noticed that he no longer felt a difference in temperature after the ice

nataly862011 [7]

Answer:

the answers is 1.

Explanation:

this is because heat always travel's from the warmest object to the coldest. His hands thermal energy is transferred to the ice making the ice round to the same temperature of his hand. This can also be an example of equalibrum.

4 0

3 years ago

2. What is the speed of a car that travels 73.4 kilometers (km) in 5 hours?

maksim [4K]

Speed =dist./time
=73.4/5
=14.68 km/hr

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3 years ago

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