biology
Which organ produces insulin?
pancreas
What property of diffusing particles affects the rate of diffusion, with heavier particles diffusing slower?
Mass
State and explain the principle of conservation of momentum. Apply it to a two-body elastic collision.
➤ Total momentum before a collision equals total momentum after the collision, provided no external forces act.
➤ In an elastic collision: m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂
What is an equilateral triangle?
A triangle with all three sides equal.
What is the name of the basic unit of matter?
Atom
If a plant cell is placed in this type of solution, the cell will lose water and the plasma membrane will pull away from the cell wall.What type of solution is it?
Hypertonic solution
What is the basic shape of the silicon-oxygen bonds in silicon dioxide?
Tetrahedral arrangement
Explain what happens to the frequency and wavelength of a sound wave as it moves from air into water.
Frequency stays the same, wavelength increases because the speed of sound is higher in water.
18 is 20% of what number?
90
Which gas makes up about 1% of the air?
argon
Name the genetic tool is used to predict the possible genotypes and phenotypes of offspring from a cross
Punnet square
What color does methyl orange turn in an acidic solution?
Red
A ball is thrown vertically upward with an initial velocity of 20 m/s. Calculate the maximum height it reaches. (Take g = 9.8 m/s²)
h = 20.41 m
A cube with a side length of 55 inches is painted black on all six faces. The entire cube is then cut into smaller cubes with sides of 11 inch. How many small cubes do not have any black paint on them?
27
How does the Doppler Effect explain why the pitch of an ambulance siren changes as it passes by?
As the ambulance approaches, the wavelength of the sound decreases and the observed frequency increases; as it recedes, the wavelength increases and the observed frequency decreases — illustrating the Doppler Effect.
Name the organ, located in the upper left quadrant of the abdomen, that filters blood and removes old or damaged red blood cells
spleen
What is one compound that speeds up the process of acid rain formation?
Sulphur dioxide (SO2)
Kirchhoff’s Second Law from Energy Conservation
In a closed loop, net work done is zero — total EMF (energy supplied) equals total IR drops (energy used).
If a central angle in a circle is 60°, what is the measure of the angle at the circumference that cuts off the same arc?
30
In the stellar life cycle, what is the stage immediately before a star begins to fuse hydrogen in its core?
A protostar
Given a maternal genotype devoid of B alleles and paternal alleles consisting of B and O, the potential phenotypic expressions in progeny would be?
AB, O, B and A
If you have 12.044 x 10^23 atoms of carbon, this is the number of moles you have.
2 moles
Two slits 0.2 mm apart are illuminated with light of wavelength 600 nm. If the screen is placed 2 m away, calculate the distance between two adjacent bright fringes (fringe spacing).
0.006 m or 6 mm
Vanessa has a $900 travel and lodging budget for her vacation. She found round-trip plane tickets for x dollars total, a hotel for y dollars per night, and free shuttle service between the airport and the hotel. If she plans to stay at the hotel for 5 nights, and she spends less than what she budgeted on travel and lodging, which of the following inequalities best describes the scenario?
x+5y<900
Why do we see different constellations in the night sky during different seasons?
We see different constellations in different seasons because the Earth orbits the Sun, changing our nighttime view of space and revealing different regions of the sky at different times of the year.