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3 years ago

Help with 7,8,9 please!!

Physics

1 answer:

Marysya12 [62]3 years ago

4 0

# 7 the answer is 4) because you need opposites in order to attract

# 8 I'm going to guess it is 4) because electricity is needed in order a light bolt to work.(don't take my word for this one I'm not sure but, the other answer are correct)

# 9 the answer is 4) because the comb dose collect negative charges from the hair in order to make the hair have positive charge.

Hope this helped : )

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at a temperature of 10 c,700 ml of hydrogen is collected. if this gas is put into a 1000 ml container what will its new temperat

erastovalidia [21]

Answer:

14.3°C

Explanation:

Find the ratio of 10°C : 700ml then use the same ratio to 1000ml.

Have a great day <3

4 0

3 years ago

Read 2 more answers

A negative charge of -6.0x10-6 C exerts an

Ray Of Light [21]

The magnitude of the second charge given that the first is –6×10¯⁶ C and is located 0.05 m away is +3.0×10¯⁶ C

<h3>Coulomb's law equation </h3>

F = Kq₁q₂ / r²

Where

F is the force of attraction
K is the electrical constant
q₁ and q₂ are two point charges
r is the distance apart

<h3>How to determine the second charge </h3>

Charge 1 (q₁) = –6×10¯⁶ C
Electric constant (K) = 9×10⁹ Nm²/C²
Distance apart (r) = 0.05 m
Force (F) = 65 N

Charge 2 (q₂) =?

F = Kq₁q₂ / r²

Cross multiply

Fr² = Kq₁q₂

Divide both side by Kq₁

q₂ = Fr² / Kq₁

q₂ = (65 × 0.05²) / (9×10⁹ × 6×10¯⁶)

q₂ = +3.0×10¯⁶ C (since the force is attractive)

Learn more about Coulomb's law:

brainly.com/question/506926

7 0

2 years ago

A capacitor is being charged from a battery and through a resistor of 10 kΩ. It is observed that the voltage on the capacitor ri

swat32

Answer:

$C = 2.48 \times 10^{-4} Farad$

Explanation:

As per the equation of voltage on capacitor we know that

$V = V_{max}(1 - e^{-\frac{t}{\tau}})$

now we know that voltage reached to its 80% of maximum value in 4 second time

so we will have

$0.80 V_{max} = V_{max}(1 - e^{-\frac{4}{\tau}})$

$0.20 = e^{-\frac{4}{\tau}}$

$-\frac{4}{\tau} = ln(0.20)$

$-\frac{4}{\tau} = -1.61$

$\tau = 2.48$

as we know that

$\tau = RC$

$(10 k ohm)(C) = 2.48$

$C = 2.48 \times 10^{-4} Farad$

4 0

3 years ago

Two identical balls are thrown vertically upward. The second ball is thrown with an initial speed that is twice that of the firs

9966 [12]

Answer:

The maximum height of ball 2 is 4 times that of ball 1

Explanation:

We can find the maximum height of each ball by using the following suvat equation:

$v^2-u^2=2as$

where

v is the final velocity

u is the initial velocity

$a=g=-9.8 m/s^2$ is the acceleration of gravity (we take upward as positive direction)

s is the displacement

At the maximum height, s = h and v = 0 (the final velocity is zero), so re-arranging the equation:

$h=\frac{-u^2}{2g}$

The first ball is thrown with initial velocity $u_1$ , so it reaches a maximum height of

$h_1 = -\frac{u_1^2}{2g}$ (the quantity will be positive, since g is negative)

The second ball is thrown with initial velocity

$u_2 = u_1$

so it will reach a maximum height of

$h_2 = - \frac{u_2^2}{2g}=-\frac{(2u_1)^2}{2g}=4(-\frac{u_1^2}{2g}) = 4h_1$

So, its maximum height will be 4 times the maximum height reached by ball 1.

8 0

3 years ago

100 POINTS. Help Please.

soldi70 [24.7K]

Answer:

The electrical force between two balloons is 67.5N.

Explanation:

There are two charged balloons, let's say a and b.

The charge on the balloon a = $Q_a = 3.0 * 10^{-6}$ C

The charge on the balloon b = $Q_b = 2.5 * 10^{-7}$ C

Both balloons are 1 cm apart; it means that the distance<em> r</em> between the balloon a and the balloon b is 0.01 m (since 1 cm = 0.01 m).

We need to find the electrical force between them. By using the Coulomb's law, the magnitude of the electrical force between both the balloon is given as follows:

$F = \frac{kQ_aQ_b}{r^2}$ --- (A)

Where,

k = Coulomb's constant = $\frac{1}{4\pi\epsilon_o}$ = $9 * 10^9 \frac{Nm^2}{C^2}$

Plug all the values in the equation (A):

$F = \frac{(9*10^9)(3.0*10^{-6})(2.5*10^{-7})}{(0.01)^2} \\F = 67.5 N$

Hence, the electrical force between two balloons is 67.5N (three significant figures).

4 0

3 years ago

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