Physics

Question 1

Conservation of linear momentum

Answer 1

m1v1 = m2v2

Question 2

Volume flow rate

Answer 2

speed x cross sectional area

Question 3

direction of magnetic force on a moving ion

Answer 3

perpendicular to velocity of charge & direction of B-field

Question 4

how to convert arcsec to degrees?

Answer 4

arcsec = 1/60 arcmin = 1/60 degrees

Question 5

something orbiting around the sun in different orbits will have 1 point that is always the same. What is it? Proof?

Answer 5

Focus of eclipse at center of sun (middle of orbit)

- Kepler & Newton’s laws

Question 6

What must balance in radioactive decay equations?

Answer 6

sum of A (mass) + Z (atomic number) before and after the decay

Question 7

What travels slower: sound waves vs. radio waves

Answer 7

sound waves

Question 8

What has a higher frequency: sound waves vs. radio waves

Answer 8

radio waves

Question 9

STP pressure

Answer 9

1 atm (760 mmHg)

Question 10

conversion between atm and mmHg

Answer 10

1 atm = 760 mmHg

Question 11

combined gas law

Answer 11

PV/T = PV/T

Question 12

how many ppm is 1%?

Answer 12

10 000

1% of a million

Question 13

loss of weight in water is due to ___

e.g. object weighs 5g less when completely submerged in benzene. It weighs 15g initially. Specific gravity of benzene is 0.7. What is the specific gravity of the object?

Answer 13

buoyancy

weight loss = mg = (5)(g) = buoyant force
Buoyancy =  pVg
(5)(g) = pVg
5 = pV = mass of fluid
15 = pV = mass of object

p(o)/p(f) = 15/5 = 3
p(o) = 3p(f) = 3(0.7) = 2.1

Question 14

When objects melt or boil, does all of the material melt at once if heat source is applied very quickly?

Answer 14

no

Question 15

If a student did NOT remove all the moisture from the KHP before the titration with NaOH(aq), then
the molarity determined for the NaOH(aq) would
be…

Answer 15

Too high

Mass of KHP would be bigger than normal, so the mols found would be too big.

Mol KHP is used to determine molarity of NaOH used for titration, so will cause molarity to be too high as well.

Question 16

Is momentum always conserved?

Answer 16

Yes, if there are no outside forces acting on the system (almost always on MCAT questions)

Question 17

KE is conserved for ___ collisions

Answer 17

elastic

Question 18

why do H undergo fusion easier than C?

Answer 18

C has more electrostatic repulsion forces

Question 19

distance between 2 adjacent nodes

Answer 19

1/2(wavelength)

Question 20

Voltage between capacitor plates

Answer 20

V = Q/C

Question 21

Mechanical waves transport…

Answer 21

momentum & energy

Question 22

What variable does not affect the voltage between electrodes?

Answer 22

resistance (R) of a resistor elsewhere in the circuit

Question 23

Fill in the blank: cathode, anode

Net movement of charge through a circuit occurs when electrons move from ____ to ____

Answer 23

cathode;

anode

Question 24

Current

Answer 24

Net movement of charge through a circuit when electrons move from cathode to anode

Question 25

Bohr model

Answer 25

electron shells

Question 26

The Bohr Model states that radiation is emitted whenever electrons move…

Answer 26

to orbitals of lower energy

Question 27

Fusion

Answer 27

Melting; solid -> liquid

Question 28

Parallel circuit has the same…

Answer 28

V

Question 29

Bernoulli’s Equation states that fluid pressure in horizontal pipe is highest where …

Answer 29

flow speed (v) is lowest

Question 30

What is the same after an explosion resulting in 2 unequal masses?

Answer 30

The 2 fragment will have the same magnitude of force exerted due to other fragment (Newton’s Third Law)

Question 31

0

-1

Answer 31

electron

Question 32

f, c, lambda

Answer 32

c = f(lambda)

Question 33

energy of photon

Answer 33

E = hf
E = hc / (lambda)

Question 34

The principal quantum number is a measure of…

Answer 34

Approximate radial size of an electron cloud