Ask question

Ask question

All categories

mrs_skeptik [129]

3 years ago

5

A mother pulls her two children on a sled through the snow along a flat street. How much work is done if she pulls her children

100 feet with a constant force of 40 pounds at an angle of 28°?

1 answer:

dimaraw [331]3 years ago

4 0

W=F.s
W=40cos28 x 100
Press the calculator yourself

You might be interested in

Enough of a monoprotic weak acid is dissolved in water to produce a 0.0144 0.0144 M solution. The pH of the resulting solution i

alexdok [17]

Answer:

The value of dissociation constant of the monoprotic acid is $1.099\times 10^{-3}$ .

Explanation:

The pH of the solution = 2.46

$pH=-\log[H^+]$

$2.46=-\log[H^+]$

$[H^+]=0.003467 M$

$HA\rightleftharpoons H^++A^-$

Initially

0.0144 0 0

At equilibrium

(0.0144-x) x x

The expression if an dissociation constant is given by :

$K_a=\frac{[A^-][H^+]}{[HA]}$

$K_a=\frac{x\times x}{(0.0144-x)}$

$x=[H^+]=0.003467 M$

$K_a=\frac{0.003467 \times 0.003467 }{(0.0144-0.003467 )}$

$K_a=1.099\times 10^{-3}$

The value of dissociation constant of the monoprotic acid is $1.099\times 10^{-3}$ .

3 0

3 years ago

Are the chemical reactions that take place when a battery connected endothermic or exothermic

Vilka [71]

Answer:

The answer is endothermic as the heat flows into the system from the surroundings. The products are at higher energy than the reactants, as they have absorbed energy.

8 0

3 years ago

From top to bottom in most groups of elements atomic radii tend to

kogti [31]

As you go down a group on the periodic table, atomic radii tend to increase because elements with larger atomic numbers have more occupied electron levels which take up more space surrounding the nucleus.

I hope this helps.

3 0

3 years ago

What parts of microscope that enlarge the object once seen under the microscope

vaieri [72.5K]

Answer:

lens are the answers, I hope it is right

7 0

3 years ago

Read 2 more answers

Which element would have the lowest electronegativity? (1 point)

irinina [24]

The element that will have the lowest electronegativity is an element with a small number of valence electrons and a large atomic radius.

Electronegativity of an element is the ability or power of that element in a molecule to attract electrons to its Valence electrons. The following are the properties of electronegativity:

It increases across a period from left to right of the periodic table,

It decreases down the periodic table groups

Group 1 elements are the least (lowest) electronegative elements. These elements have the lowest valence electrons with a large atomic radius.

Group 7 elements are the most electronegative elements.

Atomic radius of elements increase down a group because of a progressive increase in the number of shells occupied by electrons which increases the size. But it decreases across a period because electrons are accommodated within the same shell leading to greater attraction by the protons in the nucleus.

Learn more about electronegativity of elements here:

brainly.com/question/20348681

6 0

3 years ago