Renewable Energy in Malta

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.

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!