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3 years ago

A forklift applies a force of 2,000 N to raise a box 3 m.

1 answer:

6 0

If the force is applied to lift the box, then there is no work done as the displacement of the box is not in the same direction of the box.

However, if the force is being applied to move the box in the direction of the force, then the work done is:

Work = force x distance

Work = 1500 x 3

Work = 4,500 Joules

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Which of these describes chemical reaction The color of he substance

geniusboy [140]

The color of a substance is correct, also if the substances starts to bubble describes a small portion of a chemical reaction.

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4 years ago

ubstance A undergoes a first order reaction A®B with a half-life, t½, of 20 min at 25 °C. If the initial concentration of A in a

Stells [14]

Answer : The concentration of A after 80 min is, 0.100 M

Explanation :

Half-life = 20 min

First we have to calculate the rate constant, we use the formula :

$k=\frac{0.693}{t_{1/2}}$

$k=\frac{0.693}{20\text{ min}}$

$k=3.465\times 10^{-2}\text{ min}^{-1}$

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant = $3.465\times 10^{-2}\text{ min}^{-1}$

t = time passed by the sample = 80 min

a = initial amount of the reactant = 1.6 M

a - x = amount left after decay process = ?

Now put all the given values in above equation, we get

$80=\frac{2.303}{3.465\times 10^{-2}}\log\frac{1.6}{a-x}$

$a-x=0.100M$

Therefore, the concentration of A after 80 min is, 0.100 M

3 0

3 years ago

You have a 20 gram piece of aluminum and a 40 gram piece of aluminum sitting in the sun. Which piece of aluminum will increase b

Alex17521 [72]

Answer:

40 g aluminum

Explanation:

More residual heat will build up in the increased amount of aluminum atoms

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3 years ago

The Rio Grande river flows through the South Texas Plains ecoregion of Texas. The river is a major source of water for cities an

mylen [45]

Answer:

What are the answer choices

Explanation:

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3 years ago

Read 2 more answers

The contents of a rock have a 206Pb to 238U mass ratio of 0.135:1.00. Assuming that the rock did not contain any 206Pb at the ti

natima [27]

Answer: The age of the rock is $8.2\times 10^6yrs$

Explanation:

The equation used to calculate rate constant from given half life for first order kinetics:

$t_{1/2}=\frac{0.693}{k}$

where,

$t_{1/2}$ = half life of the reaction = 4.5 billion years = $4.5\times 10^9yrs$

Putting values in above equation, we get:

$k=\frac{0.693}{4.5\times 10^9yrs}=1.54\times 10^{-8}yrs^{-1}$

We are given:

Mass ratio of 206-Pb to 238-U = 0.135 : 1.00

Rate law expression for first order kinetics is given by the equation:

$k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}$

where,

k = rate constant = $1.54\times 10^{-8}yr^{-1}$

t = time taken for decay process = ? yr

$[A_o]$ = initial amount of the sample = [1.00 + 0.135] = 1.135 g

[A] = amount left after decay process = 1.00 grams

Putting values in above equation, we get:

$1.54\times 10^{-8}=\frac{2.303}{t}\log\frac{1.135}{1}\\\\t=8.2\times 10^6yrs$

Hence, the age of the rock is $8.2\times 10^6yrs$

3 0

3 years ago