Renewable Energy in Malta

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Questions and Answers

Is a geyser defined as a renewable or non-renewable energy source?

Non-renewable

Renewable (correct)

What is the primary source of the geyser?

The primary source of the geyser is the heat from the Earth's interior.

Give two examples of renewable energies that can be used on the Maltese Islands.

Two examples of renewable energies that can be used on the Maltese Islands are solar energy and wind energy.

The world is trying to change power stations that run on non-renewable energy sources to ones that run on renewable energy. Give two reasons why.

Two reasons why the world is trying to change to renewable energy are to reduce greenhouse gas emissions and to ensure energy security. Signup and view all the answers

Biomass is also defined as a renewable energy source, but it does not give all the advantages of the other renewable energies. Explain.

Biomass is a renewable energy source as it can be replenished, but it can have negative environmental impacts such as deforestation and the release of greenhouse gases. Signup and view all the answers

Electric cars still run on non-renewable energy sources, yet they are preferred to fuel-run vehicles. Can you explain why?

Electric cars are preferred to fuel-run vehicles because they produce fewer emissions, are more efficient, and have lower operating costs. Signup and view all the answers

Who would manage to go fastest, the cyclist in the stem position or the cyclist in the drops position?

The cyclist in the drops position Signup and view all the answers

Explain your answer in 'i'?

The cyclist in the drops position is more aerodynamically efficient, resulting in less air resistance and allowing them to travel faster. Signup and view all the answers

Plot a graph of speed of the cyclist (m/s) on the Y axis against power output (W) on the X axis.

The graph should be a straight line with a positive slope, demonstrating that the speed of the cyclist increases proportionally with the power output. Signup and view all the answers

Calculate the energy the cyclist uses up when his power output is 300W for 1800s.

The energy used up by the cyclist is 540000 Joules. Signup and view all the answers

In reality, the total power the cyclist needs to develop an output power of 300W is 450W. Calculate the efficiency of the cyclist.

The efficiency of the cyclist is 66.67%. Signup and view all the answers

The maximum speed attained by the cyclist on level ground was 14.5m/s. His maximum speed is less than this when he climbs uphill. Explain why.

The cyclist's maximum speed is less when climbing uphill because gravity works against the cyclist, reducing their speed for the same power output. Signup and view all the answers

Anna rode her motorcycle to work. Describe the motion during the first hour (A) of the journey.

During the first hour, Anna traveled at a constant speed of 50km/h, maintaining a uniform motion. Signup and view all the answers

In which part A, B, C or D did Anna stop to take a coffee on her way to work?

Anna stopped for coffee in part 'B' of the journey. Signup and view all the answers

Which part of the journey shows Anna returning home?

Part 'D' on the journey shows Anna returning home. Signup and view all the answers

When was Anna travelling fastest? Show your calculations

Anna was traveling fastest between points 'C' and 'D'. The speed is calculated as 150km/h. Signup and view all the answers

Calculate the total distance covered by Anna during her trip to work and back.

The total distance covered by Anna is 200km. Signup and view all the answers

Calculate the total displacement Anna covered in these 6 hours travelling.

Anna's total displacement is 0km. Signup and view all the answers

A stationary cheetah can attain a velocity of 21m/s in 2 seconds. Calculate its acceleration.

The acceleration of the cheetah is 10.5 m/s². Signup and view all the answers

Following a scent the cheetah travelled at a constant speed of 10m/s for 60s. What distance did the cheetah cover in that time?

The cheetah covered a distance of 600 meters. Signup and view all the answers

When the cheetah saw a gazelle it increased the speed to 20m/s in 1s. Calculate the new distance covered by the cheetah in this case.

The cheetah covers a distance of 20 meters in this case. Signup and view all the answers

What was Katrin's starting velocity?

Katrin's starting velocity was 10m/s. Signup and view all the answers

For how long did she keep on accelerating?

Katrin accelerated for 20 seconds. Signup and view all the answers

Did she stop traveling between the 20th and 40th seconds? Explain your answer.

False Signup and view all the answers

Calculate her deceleration.

Katrin's deceleration is -2 m/s². Signup and view all the answers

How long did she take to arrive at the library?

Katrin took 40 seconds to arrive at the library. Signup and view all the answers

When Katrin was returning home, she saw a hedgehog crossing the road and decided to stop. Some time passed until she managed to push the brake pedal. What is this time lapse called?

This time lapse is called reaction time. Signup and view all the answers

If Katrin was traveling at 30m/s and the time lapse mentioned above was 0.8s. How far had she traveled during this time?

Katrin traveled a distance of 24 meters during this time. Signup and view all the answers

When Katrin pressed the brake the hedgehog was 10m away, how much time did Katrin have to stop in time not to run over the hedgehog?

Katrin had 0.5 seconds to stop. Signup and view all the answers

Study Notes

Special Homework - On the Move

Geysers: Geysers are a form of renewable energy. The primary source of a geyser is heat.
Renewable Energies (Maltese Islands): Two examples of renewable energies usable in the Maltese Islands are not provided.
Changing Power Stations: The world is trying to switch power stations from non-renewable to renewable energy sources for two main reasons:
- Environmental impact: Minimizing pollution and greenhouse gases.
- Resource sustainability: Ensuring future energy availability.
Biomass: Biomass is renewable but does not offer the same advantages as other renewable energy sources because it may require large land areas, generate emissions or have limited storage capacity.
Electric Cars: Electric cars are preferred to fuel-run vehicles even though they still use non-renewable energy sources due to lower emissions and noise reduction. The reasons are not elaborated in the document.

Two Cyclists Racing

Fastest Position: The cyclist in the drop position is faster to explain:
Explanation: The drop position allows the cyclist to maintain balance on the bike while the upper body is close to the axle and allows for a strong force production during the pedalling motion.
Speed vs. Power Output (Table): A table shows speed (m/s) versus power output (W) for a cyclist in the drops position.
Graph of Speed vs. Power Output: A graph needs to be plotted using the data from the table.
Energy Calculation: The energy used when the cyclist's power output is 300 W for 1800 seconds is calculated.
Efficiency Calculation: The efficiency of the cyclist is found using the total power needed vs their power output.
Speed on Uphill: Maximum speed on level ground is lower than the maximum on uphill due to the force required to overcome the gradient and the increase in effort.

Anna's Motorcycle Trip

Motion Description (First Hour): A description of Anna's motorcycle trip during her first hour is asked for.
Coffee Stop Location: A specific portion (A, B, C, or D) of the graph where Anna stopped for coffee on her way to work is identified from the displacement-time graph.
Return Journey Part: A specific portion (A, B, C, or D) from the graph identifies the part of the journey showing Anna returning home.
Fastest Travelling Part: The time segment with the steepest slope shows the fastest-travelling part, and the calculations are needed to show how fast it was.
Total Distance: The total distance covered by Anna during her trip to work and back is calculated using the displacement-time graph.
Total Displacement: The total displacement Anna covered in 6 hours of traveling.

Cheetah's Acceleration and Distance

Cheetah Acceleration: A cheetah's acceleration is calculated when starting from a stationary position and reaching a certain velocity.
Cheetah Constant Speed Distance: The cheetah travels at a constant speed for 60 seconds, and the total distance is calculated.
Cheetah Acceleration Distance: When the cheetah accelerated to a new speed, the new total distance is calculated.

Katrin's Car Trip

Starting Velocity: Katrin's initial velocity is calculated from the velocity-time graph.
Acceleration Duration: The time duration of Katrin's acceleration is calculated from the graph.
Stop Between Time Intervals: It is needed to explain if Katrin stopped between the 20th and 40th seconds, based on the graph.
Deceleration Calculation: Katrin's deceleration is calculated using the velocity-time graph.
Time to Library: The time it took Katrin to reach the library is found on the graph.
Time Lapse (Hedgehog): The time lapse before Katrin applied the brakes to avoid the hedgehog is identified.
Distance Covered During Time Lapse: The distance travelled by Katrin from the time of seeing the hedgehog until the brake was applied is determined.
Time to Stop: The time Katrin has to stop before hitting the hedgehog is calculated.

Skydiving

Velocity (Skydivers): The velocity of Maria and her trainer when stepping out of the helicopter.
Forces on Skydivers: The force acting on Maria and her trainer as they float in the air.
Force Towards Ground: Calculate and name the force pulling the skydivers towards the ground.
Resultant Force: Determine the resultant force acting on the two skydivers once the velocity is constant.
Newton's Law: Identify which of Newton's laws applies to the constant velocity case.
Parachute Opening: Using the graph identify the points where the parachute is fully opened.
Maximum Speed: Using the graph and calculation identify the highest speed attained.
Terminal Velocity: Defining terminal velocity.
Terminal Velocity Point: Indicate on the graph where terminal velocity was achieved.
Motion Beyond 50s: Describe any particular motion shown on the graph after 50.
Forces on Landing: Describe the forces acting on the skydivers as they land.
Newton's Law on Landing: Determine which Newton's law applies.

Block and Pulley

Initial Energy: The initial energy form of the block before it is released in the pulley scenario.
Energy Before Impact: The form of energy just before the block hits the wooden block.
Lost Energy: Where the block's energy transfers to, when it hits the ground.
Conservation of Energy: Statement about conservation of energy principle.
Energy Value at Height: The energy value of the block at a 5m height.
Energy of Block When Hitting Wooden Post: The energy of the block as it hits the wooden post's floor.
Time Taken to Reach Post: How much time it takes for the block to reach the post.
Work Done by Samuel: The work done by Samuel to elevates the block.
Energy Source: The source of energy that Samuel uses to elevate the block.
Block Repositioning: Suggest alterations to make to the existing system to allow the wooden block to be further inserted into the ground.

Car Collision

Momentum Before Collision (Daniel's Car): Momentum of Daniel's car prior to the collision is calculated.
Momentum Before Collision (Kate's Car): Momentum of Kate's car prior to the collision is calculated.
Momentum After Collision: Momentum of both cars after the collision is calculated. The cars move together.
Direction of Movement After: Indicate in which direction the cars move after the collision.
Impact Force on Car: The impact force of the car if it stops in a given time after hitting a tree.
Force Exerted by Tree: The value of the force exerted by the tree on the car.
Physics Principle: The physics principle or law behind calculating the force.
Crash Zones: Explain the car's crumple zones and how they help reduce injuries.
Other Safety Features: Mention of other safety features within a car.

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Description

This quiz explores the concepts of renewable energy sources, including geysers and biomass, specifically within the context of the Maltese Islands. It discusses the transition from non-renewable to renewable energy and the advantages of electric vehicles. Test your knowledge on these important environmental topics!