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ICE Princess25 [194]

2 years ago

11

A person with a gravitational force of 750 N is sitting in the centre of a hammock which is strung between two trees. The ropes

supporting the hammock make an angle of 20.0 degrees to the level ground. What is the magnitude of the force on each rope?

1 answer:

bija089 [108]2 years ago

8 0

Answer:

Answer in photo

Explanation:

Answer in photo

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The coefficient of linear expansion of copper is 17 x 10^-6 K-1. A block of copper 30 cm wide, 45 cm long, and 10 cm thick is he

schepotkina [342]

Answer:

The change in volume is $6.885\times 10^{- 5}\$

Solution:

As per the question:

Coefficient of linear expansion of Copper, $\alpha = 17\times 10^{- 6}\ K^{- 1}$

Initial Temperature, T = $0^{\circ}$ = 273 K

Final Temperature, T' = $100^{\circ}$ = 273 + 100 = 373 K

Now,

Initial Volume of the block, V = $30\times 45\times 10\times 10^{- 6}\ m^{3} = 0.0135\ m^{3}$

$V' = V(1 + \gamma \Delta T)$

$\gamma = 3\alpha$

$V' = V(1 + 3\alpha \Delta T)$

where

V' = Final volume

$V' - V= 0.0135\times 17\times 10^{- 6} \times (T' - T))$

$\Delta V= 0.0135\times 3\times 17\times 10^{- 6} \times (373 - 273)) = 6.885\times 10^{- 5}\$

7 0

3 years ago

Which element is the biggest contributor to Climate Change?

sergey [27]

Answer:

carbon dioxide (CO2)

Explanation:

the burning or combustion of these fossil fuels creates gases that are released into the atmosphere. Of these gases, carbon dioxide (CO2) is the most common and is the gas most responsible for exacerbating the green- house effect that is changing global climate patterns.

7 0

2 years ago

A car accelerates from rest to a speed of 8 m/s over a distance of 16 m. What is the acceleration of the car?

Marina CMI [18]

B because all you do is divide 16 and 8 to find your answer

5 0

3 years ago

Read 2 more answers

Light traveling in air is incident on the surface of a block of plastic at an angle of

sergejj [24]

Answer:

v = 2.51 x 10⁸ m/s

Explanation:

1.00sin62.7 = nsin48.1

n = 1.19

v = c/n = 3.00e8/1.19 = 2.51e8 m/s

7 0

2 years ago

A steady 45 N horizontal force is applied to a 15 kg object a table. The object slides against a friction force of 30 N. Calcula

lisov135 [29]

The net force on an object subject to friction is equal to the sum of the applied force and the frictional force.

Mathematically,

$F_{N} = ma = F_{applied} - f_{fr}$

Here, m is mass of object and a is its acceleration. We take frictional force negative because it opposes the motion of object.

Given, $m=15\ kg$ , $F_{applied} =45\ N$ and $f_{fr} = 30\ N$

Substituting these values in above formula, we get

$15\ kg\times a = 45\ N -30\ N=15\ N \\\\a=\frac{15\ N}{15\ kg} =1\ m/s^2$ .

Thus, the acceleration of an object is $1\ m/s^2.$

6 0

3 years ago