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3 years ago

In which situation is maximum work considered to be done by a force?

Chemistry

1 answer:

Lelu [443]3 years ago

6 0

Answer:

Option E

Explanation:

As work is dot product of force and displacement

W=FdCos0

As Cos 0=1 so W=F.d(1)

W=F.d

as Cos 90=0 so no work will be done when angle between force and displacement is 90 degree. At angle between force and displacement is 180 degree then negative value com as Cos 180= -1

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) A children’s liquid cold medicine has a density of 1.23 g/mL. If a child is to take 2.5 tsp in a dose, what is the mass in gra

vekshin1

The relation between density and mass and volume is

$Density=\frac{Mass}{volume}$

the dose required is 2.5 tsp

each tsp contain 5mL

So dose required in mL = 2.5 X 5 = 12.5 mL

the mass will be calculated using following formula

$Mass=DensityXvolume$

$Mass=1.23\frac{g}{mL}X12.5mL= 15.38g$

The mass of dose in grams will be 15.38 g

5 0

3 years ago

Fill in the coefficients to balance the equation for the chemical reaction that occurs:

Dominik [7]

Answer:

The equation is balanced

Explanation:

NaCl (aq) + AgNO3(aq) ––> AgCl (s) + NaNO3 (aq)

NaCl (aq) + AgNO3 (aq)

Na = 1 , Cl=1 , Ag = 1 , No3= 1

AgCl (s) + NaNO3 (aq)

Ag = 1 , Cl=1 , Na = 1 , No3= 1

8 0

2 years ago

U-236 spontaneously decays to Br-87, X and three neutrons. What is element “X”? 1. Th 2. Pb 3. Ra 4. La 5. Ba

Elena-2011 [213]

<span>U-236 spontaneously decays to Br-87, X and three neutrons. The element X is 4. La, also known as Lanthanum, number 57 in the periodic system of elements.</span>

6 0

3 years ago

Land is a natural resource because it is used by living things to meet their needs. O True

blondinia [14]

Answer:

Absolutely True :) cause we use it all the time

7 0

3 years ago

How many moles of carbon are in 3.5 L?

SashulF [63]

Answer:

0.16mole

Explanation:

To solve this problem, we are going to assume that the number of moles of carbon to be determined is that at STP, standard temperature and pressure.

The number of moles of a substance at STP is given as;

Number of moles = $\frac{volume}{22.4}$

Given volume = 3.5L

Now, insert the parameters;

Number of moles = $\frac{3.5}{22.4}$ = 0.16mole

8 0

3 years ago