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3 years ago

in an exothermic chemical reaction the energy gained by the surroundings must be _______ the energy lost by the reaction

Physics

1 answer:

Yuliya22 [10]3 years ago

4 0

Answer:

In an exothermic reaction the energy gained by the surroundings must be equal to the energy lost by the reaction.

Explanation:

Exothermic reactions occur by the loss of energy in the form of heat to the surroundings (apparatus and the system).

The heat gained can be quantitatively analysed and measured provided no product escapes the system and it is numerically equal to the amount of heat lost by the reaction.

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You connect a 100-resistor, a 800-mH inductor, and a 10.0-uF capacitor in series across a 60.0-Hz, 120-V (peak) source. The impe

steposvetlana [31]

Answer:

Impedance, Z = 107 ohms

Explanation:

It is given that,

Resistance, R = 100 ohms

Inductance, $L=800\ mH=800\times 10^{-3}\ H=0.8\ H$

Capacitance, $C=10\ \mu F=10\times 10^{-6}\ F=10^{-5}\ F$

Frequency, f = 60 Hz

Voltage, V = 120 V

The impedance of the circuit is given by :

$Z=\sqrt{R^2+(X_C-X_L)^2}$ ...........(1)

Where

$X_C$ is the capacitive reactance, $X_C=\dfrac{1}{2\pi fC}$

$X_C=\dfrac{1}{2\pi \times 60\times 10^{-5}}=265.65\ \Omega$

$X_L$ is the inductive reactance, $X_L={2\pi fL}$

$X_L={2\pi \times 60\times 0.8}=301.59\ \Omega$

So, equation (1) becomes :

$Z=\sqrt{(100)^2+(265.65-301.59)^2}$

Z = 106.26 ohms

Z = 107 ohms

So, the impedance of the circuit is 107 ohms. Hence, this is the required solution.

8 0

4 years ago

Which change will always result in an increase in the gravitational force between two objects? increasing the masses of the obje

abruzzese [7]

By definition, we have that the gravitational force is given by:

$F = \frac{G * m1 * m2}{r ^ 2}$

Where,

G: gravitational constant

m1: mass of object number 1

m2: mass of object number 2

r: distance between both objects.

Therefore, for the gravitational force to increase, the following conditions must be met:

1) Increase the mass of the objects so that the numerator of the equation is greater.

2) Decrease the distance between the objects so that the denominator of the equation is smaller.

Answer:

A change that will always result in an increase in the gravitational force between two objects is:

increasing the masses of the objects and decreasing the distance between the objects

4 0

3 years ago

Read 2 more answers

The most likely theory of the formation of Earth's Moon is that it The most likely theory of the formation of Earth's Moon is th

Ann [662]

Answer:

Option (3)

Explanation:

According to researches done by the astronomers, it has been found that the earth collided with a giant Mars-size early proto-planet, whose name was 'Theia' during the Hadean era, about.5 billion years back. This collision resulted in the detachment of a considerably huge amount of material away from the earth. The remnant debris particles accumulated and gave rise to the formation of moon. The earth during that time was comprised of molten lava only, and from this collision, the earth attained its tilt of approximately 23.5°.

Thus, the correct answer is option (3).

4 0

4 years ago

A piston of small cross-sectional area a is used in a hydraulic press to exert a small force f on the enclosed liquid. A connect

seropon [69]

Answer:

force on larger piston = $\frac{fA}{a}$

Explanation:

we label the pistons as piston A and piston B

small piston A:

area = a

force = f

large piston B:

area = A

force = ?

Pascal's law of pressure state that the pressure delivered to a liquid is transmitted undiminished to every portion of the fluid.

we know that pressure = force ÷ area

pressure of piston A = $\frac{f}{a}$

pressure of piston B = $\frac{(force on piston B)}{A}$

obeying Pascal's law, the system pressures must be equal. Therefore

$\frac{f}{a} = \frac{(force on piston B)}{A}$

force on large piston (B) = F = $\frac{fA}{a}$

3 0

4 years ago

A motarcycle covers a distance of 1.8km in 5minutes.Calculate its average velocity

MissTica

Answer:

0.6 m/s

Explanation:

1.8 km = 1800 m

5 minutes= 300 s

Now,

Velocity = Displacement / time

= 1800/300

= 0.6 m /s

8 0

3 years ago