Answer: The current flowing through the circuit is 0.01A (or 10 mA)
Explanation:
Use Ohm's Law:

Given the values of U=30V and R=3000Ohm:

Complete question:
Find the pressure exerted by a waterbed with dimensions of 2 m x 2 m which is 30 cm thick. (hint: use 1000 kg/m³ as density of water)
Answer:
The pressure exerted by the waterbed is 2940 N/m²
Explanation:
Given;
Length of waterbed, L = 2 m
Width of waterbed, W = 2 m
Height of waterbed, H = 30 cm = 0.3 m
density of water, ρ = 1000 kg/m³
Hydrostatic pressure derivation:

The hydrostatic pressure exerted by the waterbed is directly proportional to the height of the waterbed. Thus, the hydrostatic pressure increases with increase in height of the waterbed.
Hydrostatic Pressure exerted by the waterbed:
P = ρgH
P = 1000 x 9.8 x 0.3
P = 2940 N/m²
Therefore, the pressure exerted by the waterbed is 2940 N/m²
I think that the girl has greater tangential acceleration because she is closer to the center and the acceleration is greater there.
having to push a rough and heavy box across the floor to move it
Explanation:
Friction is not a useful force because we have to exert even more force to push a body that is rough and heavy across the floor to move it.
- Frictional force is a force that opposes the motion of a body.
- It costs more and uses more energy to push a rough and heavy box on surface because of friction.
- This wastes energy in systems that deals with pushing.
Friction is useful in that:
- the heat energy produced when two surfaces rub together is very useful.
- the friction between your feet and the floor keeping you from slipping and makes walking possible.
- the tread on tires helping the moving vehicle slow down and stop when necessary.
learn more:
Friction brainly.com/question/7174363
#learnwithBrainly