Physics⚡
What is the SI unit of force?
Newton (N).
What molecule carries genetic information in most living organisms?
DNA.
Which organ pumps blood around the body?
The heart.
In which year did World War I begin?
1914.
Express 0.65 as a percentage
65%
A car travels 240 m in 12 seconds. Calculate its average speed. *
v = 240/12 = 20 m/s.
Lucky Break: Your team gains 200 bonus points!
What is the main function of mitochondria?
They release usable energy through cellular respiration and produce ATP.
Double Trouble: Double the points on your next correctly answered question.
Which blood vessels carry blood away from the heart?
Arteries.
Which country was divided into East and West during the Cold War?**
Germany.
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A $240 item is discounted by 15%. Calculate its sale price.
240 x 0.85 = 204
Explain the difference between mass and weight.
Mass is the amount of matter in an object, measured in kg. Weight is the gravitational force acting on it, measured in N.
Why are enzymes described as biological catalysts?
They speed up chemical reactions without being consumed by the reactions.
What is the role of haemoglobin in red blood cells?***
It binds to and transports oxygen.
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What was the purpose of the Berlin Airlift of 1948–49?
Western Allies supplied West Berlin by air after the Soviet Union blocked land access.
car travels 150 km at an average speed of 75 km/h. How long does the journey take? **
Everyone, submit an answer to this question
t=d/v=150/75=2 hours
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A 5 kg object accelerates at 4m/s^2.*
Calculate the resultant force. *
F=ma=5 x 4=20N.
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Explain why a mutation is not always harmful to an organism.
It may have no effect, may be beneficial, or may be harmful depending on how it affects the organism and its environment.
Explain why heart rate increases during exercise.
Working muscles require more oxygen and nutrients and produce more carbon dioxide. Increased heart rate helps deliver oxygen and remove waste products.
Explain why the Cuban Missile Crisis of 1962 was considered dangerous.
The United States and Soviet Union confronted each other over Soviet nuclear missiles in Cuba, creating a serious risk of nuclear war.
An investment of $2,000 earns compound interest at 5% per year for 3 years. Calculate its final value.
A=2000(1.05)^3=$2,315.25.
A ball is thrown vertically upwards. Explain how its velocity and acceleration change as it rises, reaches its highest point, and falls. Ignore air resistance.
While rising, its upward velocity decreases. At the highest point, velocity is momentarily zero. While falling, velocity increases downward. Acceleration remains constant at approximately 9.8 m/s^2 downward throughout.
A population of bacteria is exposed to an antibiotic. Explain how antibiotic-resistant bacteria can become more common over several generations. *
Some bacteria already possess resistance due to genetic variation or mutations. The antibiotic kills susceptible bacteria, while resistant bacteria survive and reproduce. Resistance becomes more common over generations through natural selection.
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Explain how the body responds when its internal temperature rises during exercise. *
The hypothalamus detects the temperature change and coordinates responses such as sweating and vasodilation of skin blood vessels. These increase heat loss and help return body temperature to normal.
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Explain how ideological differences between the United States and the Soviet Union contributed to the Cold War.***
All In: Your team can double this question's points. If incorrect, you score zero for this question.
The United States generally supported capitalism and liberal democracy, while the Soviet Union promoted communism and a centrally planned economy. Each side feared the other's influence and sought to protect or expand its political and strategic interests.
A boat travels 18 km east, then 25 km north. Calculate the direct distance from its starting point to its final position. Give your answer to one decimal place.*
By Pythagoras, d=18^2+25^2=949
=30.8 km
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