Linear Motion & Force
Heating Processes
Ionising Radiation
Random Science
Electrical Circuits
Waves
Random Stuff
100
If a force of 10 N is applied to a 2 kg object, what is the acceleration of the object?
a = 5 m/s2
100
Convert a temperature of 150oC to Kelvin.
TK = 423 K
100
Define half-life.
The amount of time it takes for a substance to reach half its original amount
100
What is the second most abundant element in the Earth's crust?
Silicon
100
What is the relationship between voltage, current, and resistance in a circuit known as?
Ohm's Law
100
What are the two main types of waves?
Transverse and longitudinal
100
What is the smallest country in the world by land area?
Vatican City
200
A cyclist traveling at 10 m/s decelerates uniformly at a rate of 2 m/s². How long will it take for the cyclist to come to a stop?
t = 5 s
200
Define specific heat capacity.
Amount of energy required to raise the temperature of 1 kg of a substance by 1oC
200
A radioactive isotope has a half-life of 6 hours. If you start with a 160 g sample, how much of the substance will remain after 24 hours?
10 g
200
Which organelle in plant cells is responsible for photosynthesis?
Chloroplast
200
Calculate the total resistance in a series circuit with three resistors of 4 Ω, 6 Ω, and 8 Ω.
Rt = 18 Ω
200
A wave has a frequency of 500 Hz and a wavelength of 0.68 meters. What is the speed of the wave?
v = 340 m/s
200
Who was the longest-reigning British monarch before Queen Elizabeth II?
Queen Victoria
300
A 5 kg object is moving at a velocity of 4 m/s. Calculate the kinetic energy of the object and the force required to stop it in 2 seconds.
Ek = 40 J
F = 10 N
300
A 200 g piece of metal absorbs 840 J of heat and its temperature increases from 20°C to 50°C. Calculate the specific heat capacity of the metal.
140 J kg-1 oC-1
300
A radioactive substance decays to 35% of its original amount in 16 years. Calculate the half-life of the substance.
t0.5 = 10.56 years
300
What type of bond is formed when atoms share electrons?
Covalent bond
300
If the power dissipated in a resistor is 20 W and the current through the resistor is 5 A, what is the resistance of the resistor?
R = 0.8 Ω
300
For an open-end pipe of length 2 metres, what is the frequency of the first overtone (second harmonic) if the speed of sound is 343 m/s?
300
In Greek mythology, who is the goddess of wisdom and warfare?
Athena
400
An object is projected upwards with an initial velocity of 30 m/s. Calculate the maximum height it reaches and the total time it takes to return to the starting point.
s = ~ 45.9 m
t = ~ 6.12 s
400
A 100 g piece of iron at 100°C is placed in 200 g of water at 20°C. Assuming no heat loss to the environment, what will be the final temperature when they reach thermal equilibrium? (Use specific heat capacities: iron cFe = 450 J kg-1 oC-1,water cH20 = 4200 J kg-1 oC-1).
Tf = ~ 25.5 oC
400
A sample initially contains 4.12 × 106 atoms of iodine-131, a radioactive isotope with a half-life of 8 days days. Estimate the time required for the sample to contain only 50,000 atoms of iodine-131.
50.91 days
~ 51 days
400
What is the name of the process by which cells divide to form two identical daughter cells?
Mitosis
400
In a parallel circuit with resistors of 2 Ω, 4 Ω, and 6 Ω, calculate the total resistance.
Rt = 1 Ω
400
Calculate the critical angle for total internal reflection for light passing from glass (refractive index n=1.50) into air (refractive index n=1.00).
~ 42o
400
In which year was the United Nations founded?
1945
500
Two cars collide at an intersection. Car A has a mass of 1,200 kg and is moving east with a velocity of 15 m/s. Car B has a mass of 1,500 kg and is moving west with a velocity of 10 m/s. After the collision, the two cars stick together. Calculate final velocity.
v = 1.11 m/s
500
An electric heater supplies 1000 J/s to a 2 kg block of aluminium. If the block's temperature increases by 15oC in 5 minutes, calculate the specific heat capacity of aluminium.
c = 10 000 J kg-1 oC-1
500
A nuclear reaction converts 2.014 u of deuterium (²H) and 3.016 u of tritium (³H) into 4.0026 u of helium-4 and a neutron (mass 1.0087 u). Calculate the mass defect.
0.0187 u
500
Which principle explains why airplanes are able to fly?
Bernoulli's principle
500
A 12 V battery is connected to a series circuit with a 4 Ω resistor and a 2 Ω resistor. Calculate the voltage drop across the 4 Ω resistor.
500
A pipe open at both ends resonates at its third harmonic with a frequency of 600 Hz. If the speed of sound is 340 m/s, what is the length of the pipe?
f = 0.85 m
500
Which African country was formerly known as Abyssinia?
Ethiopia