Density is defined as (mass) per unit (volume). So in order to calculate
the density of a glob of some substance, you pretty much have to measure
its mass and its volume.
Answer:
the buoyant force F will be 0.84 N
Explanation:
Assuming that a person has the density of water , then its volume could be calculated through
V= m/ρ , where m= mass of the person , ρ= density of water
then
V= m/ρ = 70 kg/ 1000 kg/m³ = 0.07 m³
then the buoyant force will be equal to the mass of displaced air in the volume V.
if we assume that the density of air in the atmosphere is ρa=1.225 kg/m³ then the buoyant force F will be
F= ρa*V*g = 0.07 m³*1.225 kg/m³ *9.8 m/s² =0.84 N
The fertilised ovule<span> goes on to form a seed, which contains a food store and an embryo that </span>will<span> later </span>grow into<span> a new plant</span>
Answer:
A. An electric motor hums as it powers a conveyor belt
D. A car engine heats up while the car is being driven.
Explanation:
Energy inefficiency usually involves loss of energy as other forms when they are being converted from one form to another.
The two choices that fit the description includes;
- An electric motor humming as it powers a conveyor belt. This energy conversion is supposed to be from electrical to mechanical energy but there is a loss due to the sound energy produced by the motor.
- Heat energy produced as the car is driven also results in energy inefficiency.
Other choices do not show this inefficiency.
The answer is c. athletes foot