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3 years ago

Write the formula of gravitational force between two bodies of masses x and y kept at a distance r

Physics

1 answer:

Ierofanga [76]3 years ago

8 0

Answer:

F=Gxy/r^2

Explanation:

F=Gm1m2/d^2

F=Gxy/r^2

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Sally Sizzle builds a circuit by connecting three resistors in oarallel with a 9v battery. The current in this curvuit is 3.6 am

Sergeeva-Olga [200]

Answer:

The new resistor has resistance of 9Ω.

Explanation:

The effective resistance of three resistance is

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

we know the the circuit with 9V battery has current of 3.6A; therefore, $R_e$ must be

$V = IR_e$

$R_e = \dfrac{V}{I} = \dfrac{9V}{3.6A}$

$R_e = 2.5\Omega$ ,

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

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

which we solve for $R_4$ :

$0.511\Omega^{-1} =0.4\Omega^{-1}+\frac{1}{R_4} ,$

$0.111\Omega^{-1} = \dfrac{1}{R_4}$

$\boxed{R_4 = 9\Omega}$

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

3 0

4 years ago

Whats the answer for the second question ???

Rama09 [41]

We don't know the question you're talking about, hun.
Add a picture or paste it into the caption :)

6 0

3 years ago

On a particle level, what happens when thermal conduction occurs within a liquid?

Elodia [21]

B sounds perfect to me

4 0

4 years ago

Read 2 more answers

Describe three events that you cannot explain.<br> About energy and matter

ZanzabumX [31]

Answer:

A teacher giving homework on fridays

A teacher giving tests on fridays

A teacher holding you back after class on fridays

Explanation:

because i luv friday

5 0

3 years ago

Jain applies a input force of 100 N to a lever that has a Mechanical advantage of 3. What is the output force

Licemer1 [7]

Answer:

Output force = 300 N

Explanation:

Given that,

The mechanical advantage of a lever, m = 3

Input force, $F_i=100\ N$

We need to find the output force. The ratio of output force to the input force is called the mechanical advantage of the lever. So,

$m=\dfrac{F_o}{F_i}\\\\F_o=m\times F_i\\\\F_o=3\times 100\\\\F_o=300\ N$

So, the output force is 300 N.

8 0

3 years ago