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4 years ago

Mass = 567.5 g Volume = 50.0 cm3 What is the density of lead? 1.135 g/cm3 11.35 g/cm3 113.5 g/cm3 1,135 g/cm3

Physics

1 answer:

nlexa [21]4 years ago

8 0

Density = mass / volume So density =567.5/50 = 11.35 g/cm3.

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4 years ago

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Answer:

The new resistor has resistance of 9Ω.

Explanation:

The effective resistance of three resistance is

$(1). \: \: \frac{1}{R_e} = \frac{1}{R_1}+ \frac{1}{R_2}+ \frac{1}{R_3}$ .

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which means

$\frac{1}{2.5\Omega } = \frac{1}{R_1}+ \frac{1}{R_2}+ \frac{1}{R_3}$

$\boxed{0.4\Omega^{-1} = \frac{1}{R_1}+ \frac{1}{R_2}+ \frac{1}{R_3} .}$

Now, Sally wants to connect another resistor in parallel so that the current becomes 4.6A. The resistance required for that is

$R_{new} = \dfrac{9V}{4.6A}$

$R_{new} = 1.957 \Omega$ .

which means the 4th resistor $R_4$ must satisfy the equation

$(2), \: \: \frac{1}{1.957\Omega} = \frac{1}{R_1}+ \frac{1}{R_2}+ \frac{1}{R_3}+\frac{1}{R_4} ,$

and since

$\frac{1}{R_1}+ \frac{1}{R_2}+ \frac{1}{R_3} =0.4\Omega^{-1},$

equation (2) becomes

$\frac{1}{1.957\Omega} =0.4\Omega^{-1}+\frac{1}{R_4} ,$

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Thus, the resistance of the new resistor is 9 ohms.

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