Physics
What is the SI unit of power?
Watt (W)
What is the ion responsible for acidity in solutions?
H+ ion
What organelles are present in a plant cell but not in an animal cell?
chloroplast
A 5 kg object is lifted 3 m in 4 seconds. What is the power required?
36.75 W
What is the product of a reaction between an acid and a metal?
Salt and hydrogen gas
What is the equation for aerobic respiration?
C6H12O6+6O2→6CO2+6H2O+ATP
A machine has an efficiency of 75% and an input energy of 5000 J. How much useful energy is produced?
3750 J
Why does ionic bonding occur?
Because atoms lose or gain electrons to achieve a stable noble gas configuration
What are the three types of blood vessels?
Arteries, veins, capillaries
Define terminal velocity and explain how it is achieved.
Terminal velocity is the constant speed an object reaches when the force of gravity is balanced by air resistance.
Why do metals conduct electricity?
They have a sea of delocalized electrons that move freely.
What is the difference between diffusion and active transport?
Diffusion is passive, active transport requires energy (ATP)
A 3 kg ball is dropped from a height of 50 m. Ignoring air resistance, what is the velocity just before it hits the ground?
31.3 m/s
A sample contains 60% 63Cu and 40% 65Cu. Calculate the relative atomic mass of copper
Ar=(63×0.6)+(65×0.4)=63.8
What is an enzyme’s active site?
The region where the substrate binds for a reaction.