Answer:
The force on the test charge is 114.75 N.
Explanation:
Given that,
Test charge 
Suppose the test charge is 3.4 μC and the distance between the charge and test charge is 4.0 cm.
We need to calculate the force on the test charge
Using formula of electric force
Where, q = test charge
q₁ =charge
r = distance
Put the value into the formula
Hence, The force on the test charge is 114.75 N.
An incandescent bulb produces light that comes from the heating of a filament. A compact fluorescent bulb produces light when a substance is hit by electromagnetic radiation. Compact fluorescent bulbs are more efficient than incandescent bulbs.
The first law of thermodynamics is a version of the law of conservation of energy, adapted for thermodynamic processes. Therefore, a system with lower heat emissions would be more efficient.
The second law of thermodynamics states that the total entropy of an isolated system (the thermal energy per unit temperature that is unavailable for doing useful work) can never decrease. In our context, it means that the system with the least amount of losses would be more efficient. As a conclusion the fluorescent bulb would be more efficient.
Answer:
The speed of sound depends on the medium thru which it travels in contrast to light (electromagnetic) which can travel thru a vacuum.
The speed of sound will depend on the density of the air thru which it travels - the density of air is particularly affected by
humidity - water vapor in the air contributes to less density
temperature - warmer is less dense
motion of air - if the air is not motionless the speed will be affected
The farther from earth's surface you are, the less gravitational attraction there is. So you will weigh less on a space ship because you have escaped the gravitational pull of earth. When you finally reach the moon, your weight is roughly one sixth what it is on earth.
