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3 years ago

9

Help me I got this photo please

1 answer:

klemol [59]3 years ago

8 0

Answer:

Carbon Sink- photosythesis, ocean absorption, fossilization

Carbon Source- combustion, respiration

Explanation:

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calculate the diameter of a silver wire of length 75cm , which is extended by 1.85mm when a 10kg mass is suspended from it's end

sdas [7]

Answer: $0.8\ mm$

Explanation:

Given

length of wire $l=75\ cm$

change in length $\Delta l=1.85\ mm$

mass of wire $m=10\ kg$

Young's modulus for silver $E=7.9\times 10^{10}\ N/m^2$

load on wire $F=mg$

$F=10\times 9.8=98\ kg$

change in length is given by

$\Delta l=\dfrac{Pl}{AE}$

Where A=area of cross-section

$A=\dfrac{Pl}{\Delta lE}$

$A=\dfrac{98\times 0.75}{1.85\times 10^{-3}\times 7.9\times 10^{10}}$

$A=\dfrac{73.5}{14.615\times 10^{7}}$

$A=5.029\times 10^{-7}\ m^2$

also wire is the shape of cylinder so cross-section is given by

$A=\dfrac{\pi d^2}{4}=5.029\times 10^{-7}\ m^2$

$\Rightarrow d^2=\dfrac{5.029\times 10^{-7}\times 4}{\pi }$

$\Rightarrow d^2=64.02\times 10^{-8}$

$\Rightarrow d=8\times 10^{-4}\ m$

$\Rightarrow d=0.8\ mm$

4 0

3 years ago

You throw a ball with a mass of 0.50 kg against a brick wall. It hits the wall moving horizontally to the left at 20 m/s and reb

Orlov [11]

Answer:

The value of impulse of the net force on the ball during its collision with wall is $I = 15\ kg \frac{m}{s}$

The value of average horizontal force that the wall exerts on the ball during the impact is F = 15000 N

Explanation:

Mass of the ball = 0.5 kg

Horizontal velocity $V_{x}$ = 20 $\frac{m}{s}$

Velocity after collision $V_{-x}$ = - 10 $\frac{m}{s}$

(A). Impulse of the net force on the ball during its collision with wall is

$I = m (V_{x} - V_{-x})$

I = 0.5 × (20 + 10)

$I = 15\ kg \frac{m}{s}$

This is the value of impulse of the net force on the ball during its collision with wall.

(B). The magnitude of average horizontal force

$F = \frac{I}{T}$

Where F = Force

I = impulse & t = time interval = 0.001 sec

$F = \frac{15}{0.001}$

F = 15000 N

This is the value of average horizontal force that the wall exerts on the ball during the impact.

8 0

3 years ago

The best base unit for measuring the length of a carpet is a ____

sammy [17]

The answer will be B) Meter

5 0

3 years ago

Read 2 more answers

Select the correct answer.

Gelneren [198K]

Answer: It's b and c I got it right

Explanation:

Hope this helped!!!! :)

8 0

3 years ago

An ice cube of mass 50.0g can slide without friction up and down a 25.0 degree slope. The ice cube is pressed against a spring a

sergejj [24]

Answer:

Explanation:

Given

mass of ice cube $m=50 gm$

inclination $\theta =25^{\circ}$

Spring constant $k=25\ N/m$

initial compression $x=0.1 m$

Suppose Initially the cube is at the datum and it moves h height after release

So Elastic Potential Energy of Spring will convert to Potential Energy of cube

$\frac{1}{2}kx^2=mgh$

$\frac{1}{2}\times 25\times (0.1)^2=50\times 10^{-3}\times 9.8\times h$

$h=0.255 m$

so final Potential Energy will be $=mgh=0.05\times 9.8\times 0.255=0.125 J$

Initial Potential Energy $=0 J$

B.Initially spring is at compression so energy associated with it is its Elastic Potential Energy i.e. 0.125 J

Final Energy $=0 J$

7 0

3 years ago

Read 2 more answers