During that final period of time,
his acceleration is
(9 m/s - 5 m/s) / (4 sec) = 1 m/s² .
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The voltage in the resistor is 63 V
Explanation:
We can solve the problem by applying Ohm's law, which states the relationship between voltage, current and resistance in a resistor:

where
V is the voltage
R is the resistance
I is the current
For the resistor in this problem, we have:
I = 0.42 A is the current
is the resistance
Substituting into the equation, we find the voltage needed:

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Answer:
Q₁ = Q₂ = 8.84 x 10⁻⁹ C
Explanation:
given,
mass of ball, m = 0.16 g = 1.6 x 10⁻⁴ Kg
ball each other, r = 6.8 cm
Weight of the ball
F_w = m g
F_w = 1.6 x 10⁻⁴ x 9.8
F_w = 1.56 x 10⁻³ N
The tension in each string is a force directed along the length of the string and is the hypotenuse of a right triangle.
we have to find the horizontal component of the forces.
The length of the string,L is 35 cm so, it will be the hypotenuse.
θ be the angle made with imaginary vertical line and the string.
now,
θ = 5.57°
horizontal component of the force = ?
vertical component of force,F_v = 1.56 x 10⁻³ N


F_h = 1.52 x 10⁻⁴ N
now, each ball will be repelled by
F = 1.52 x 10⁻⁴ N
now calculation of charges

Q₁ = Q₂ because both charge are same

Q² = 7.809 x 10⁻¹⁷
Q = 8.84 x 10⁻⁹ C
hence the change on the balls were Q₁ = Q₂ = 8.84 x 10⁻⁹ C
mass of the box = 20 kg
force of friction on the box due to surface



similarly kinetic friction on it



now the weight of the suspended block will be

so here the weight of the suspended block is less than the limiting friction on it
So here we will say that friction will counter balance the weight of the suspended block and it will not move at all
So acceleration of the box will be zero