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3 years ago

Energy released in a chemical reaction comes from ?

1 answer:

8 0

Chemical reactions often involve changes in energy due to the breaking and formation of bonds. Reactions in which energy is released are exothermic reactions, while those that take in heat energy are endothermic.

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6. Four people are trying to help push and lift a refrigerator up a series of stairs. Jim pushes

professor190 [17]

Answer:

Net force due to all on the refrigerator is 400 N

Explanation:

As we know that two people are pushing the refrigerator while other two people are lifting the refrigerator

So net push force on the refrigerator is given as

$F = F_1 + F_2$

$F = 60 + 210$

$F_1 = 270 N$

Similarly net lift force on the refrigerator is given as

$F = F_1' + F_2'$

$F = 200 + 95$

$F_2 = 295 N$

Now net force on the refrigerator is given as

$F_{net} =\sqrt{F_1^2 + F_2^2}$

$F_{net} = \sqrt{270^2 + 295^2}$

$F_{net} = 400 N$

4 0

4 years ago

The pressure at the bottom of a full barrel of water is Poriginal. Determine what happens to the pressure when the radius or hei

erastovalidia [21]

Answer:

C) Pnew=Poriginal/9

Explanation:

From the given conditions:

Original area, $A_o=\pi.r_o\,^2$

New area of the barrel bottom panel after increasing by a factor of 3:

$r_{new}=3r_o$

On increasing the radius the area now becomes:

$A_{new}=\pi.(3r_o)^2$

$A_{new}=9\pi.(r_o)^2=9A_o$

As we know that there will be no increase in the down-force since the height remains constant.

Pressure is given as:

$P_{original}=\frac{Force}{A_o}$

∴New pressure:

$P_{new}=\frac{Force}{9A}$

$\Rightarrow P_{new}=\frac{P_{original}}{9}$

4 0

3 years ago

You want the output current from the secondary coil of a transformer to be 10 times the input current to the primary coil. The r

WARRIOR [948]

Answer:

D. 0.1

Explanation:

Using transformer equation,

N2/N1 = I1/I2................... Equation 1

Where N2 = secondary coil, N1 = primary coil, I1 = input current, I2 = output current.

make I2 the subject of the equation

I2 = I1/(N2/N1)............ Equation 2

From equation 2 above, For the output current of the secondary coil to be 10 times the input current, N2/N1 = 0.1

Hence the right option is D. 0.1

7 0

4 years ago

Calculate the net force on the crate if the magnitude of the forces in the diagram are Fg=10N, Fapp= 7.5N, Ff=2.5N and Fn=10N

monitta

Answer:

5 units to the left

Explanation:

I had the same question :)

6 0

3 years ago

What is the distance magnification formula

damaskus [11]

Does that help I hope IT does you probably just have to write the 1st sentence.

7 0

4 years ago