It is because the weight is equal to each other and balances out. example war ships have tons of metal, but it spreads the weight on the water
Making prediction , hypothesis and guessing to see if it’s right , and leading
Answer:
0.5
Explanation:
calculating the total resistance for the both the parallel and the series resistors then later using the ohm's law formulae V=IR to calculate current.
Answer: D
Explanation:
Let us examine the given actions to see which ones generate heat and sound energy from mechanical energy.
A) Stretching a string.
The mechanical stretching creates tension in the string, which is released when the tension is removed. The generation of thermal or sound energy is minimal or negligible.
B) Squeezing a sponge ball
The sponge ball experiences compressive loading. This generates minimal or no heat and sound energy.
C) Throwing a ball upwards in the air
Air friction generates minimal or no heat at low velocities. At low velocities the pressure waves are too small to generate sound.
D) Striking a hammer on a nail.
A tremendous amount of force is applied over a small area to generate very high stresses that are in the plastic zone. A high amount of thermal energy is generated and the localized disturbance of the air generates audible sound.
This is the correct situation.
