The LAST choice is the correct one.
activities you can do on a regular basis for physical education?
If so
- Walking
- Gardening
- Dancing
- Bicycling
- Swimming
- Yoga
Answer:
Q₂ = (9.83 × 10⁻⁹) C = +9.83 nC
Explanation:
The force of attraction/repulsion between the two charges is equal to the force of gravity on the charge 2.
The force of gravity on the charge two = mg
= 6.5 μg × 9.8 m/s² = (6.37 × 10⁻⁵) N
Since the gravity force is directed downwards, the force on charge 2 due to charge 1 has to be directed upwards, hence it is a force of repulsion.
The magnitude of the force between the two charges is given according to the Coulomb's law.
F = kQ₁Q₂/r²
k = Coulomb's constant = (9.0 × 10⁹) Nm²/C²
Q₁ = 45 nC = (45 × 10⁻⁹) C
Q₂ = ?
r = 25 cm = 0.25 m
F = (6.37 × 10⁻⁵) N
(6.37 × 10⁻⁵) = [(9.0 × 10⁹) × (45 × 10⁻⁹) × Q₂] ÷ 0.25²
Q₂ = 0.00000000983 C = (9.83 × 10⁻⁹) C = 9.83 nC
Hope this Helps!!!
Answer:
The angular speed is 0.83 rad/s.
Explanation:
Given that,
Mass of disk M=49 kg
Radius = 1.7 m
Mass of child m= 29 kg
Speed = 2.6 m/s
Suppose if the disk was initially at rest , now how fast is it rotating
We need to calculate the angular speed
Using conservation of momentum
Put the value into the formula
Hence, The angular speed is 0.83 rad/s.
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