Why do people use block and teckle systems to move heavy objects?

Chemistry

1 answer:

yaroslaw [1]3 years ago

8 0

H. using a pulley system can reduce the load force, over a greater distance.<span />

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What evidence of a chemical reaction might you see in dropping an Alka-Seltzer tablet into a glass of water?

Arisa [49]

Gas is released by addition of the tablet into water. It is possible to capture the gas emitted and test it - it will be carbon dioxide.

4 0

3 years ago

8) change 0.5cm into milimeters

chubhunter [2.5K]

When I change it, I think it's 5 mm

8 0

3 years ago

24. The air in a small 250 cm birthday balloon is at a pressure of 760 torr. A boy sits on it at

kvv77 [185]

Answer:

1.14atm

Explanation:

Given parameters:

V1 = 250cm³ ;

1000cm³ = 1dm³; so this is 0.25dm³

P1 = 760torr

760torr = 1atm

V2 = 220cm³ ; 0.22dm³

Unknown:

New pressure = ?

Solution:

To solve this problem, we apply Boyle's law and we use the expression below:

P1 V1 = P2V2

The unknown is P2;

1 x 0.25 = P2 x 0.22

P2 = 1.14atm

7 0

3 years ago

Carbon tetrachloride can be produced by the following reaction: Suppose 1.20 mol of and 3.60 mol of were placed in a 1.00-L flas

hjlf

The given question is incomplete. The complete question is :

Carbon tetrachloride can be produced by the following reaction:

$CS_2(g)+3Cl_2(g)\rightleftharpoons S_2Cl_2(g)+CCl_4(g)$

Suppose 1.20 mol $CS_2(g)$ of and 3.60 mol of $Cl_2(g)$ were placed in a 1.00-L flask at an unknown temperature. After equilibrium has been achieved, the mixture contains 0.72 mol of $CCl_4$ . Calculate equilibrium constant at the unknown temperature.