Question 1: Power in physics is the rate at which work is done or energy is transferred. It is measured in Watts (W).

Answer: Power is the rate at which work is done or energy is transferred, measured in Watts.

Question 2: Explain in your own words what it means if a machine has high power output.

Answer: It means the machine transfers a large amount of energy or does a lot of work in a short period of time.

Question 1: What is the formula used to calculate Power when work and time are known?

Answer: Power = Work done / Time taken

Question 2: List two practical examples of devices or situations where high power transfer is important.

Answer: Electric motors in appliances; engines in vehicles.

Question 1: A motor does 1500 Joules of work in 30 seconds. Calculate its power output in Watts.

Answer: Power = Work / Time = 1500 J / 30 s = 50 W

Question 2: A cyclist transfers 500 Joules of energy in 10 seconds. What is the cyclist's average power transfer?

Answer: Power = 500 J / 10 s = 50 W

Question 1: Outline the variables that need to be measured and safety precautions to consider.

Answer: Variables include the work done (or energy transferred) and the time taken. To measure power, one could measure the energy consumed and the duration of operation. Safety precautions involve ensuring electrical safety by unplugging devices before handling and avoiding water contact with electrical components.

Question 1: A solar panel generates 600 Joules of energy in 2 minutes. Determine the Power output in Watts and interpret what this indicates about the panel's performance.

Answer: Power = 600 J / 120 s = 5 W. This indicates the panel's rate of energy transfer per second; a higher wattage would mean more efficient energy generation.

Question 1: Explain how understanding Power is important in designing electric vehicles.

Answer: Understanding Power helps engineers design batteries and motors that can deliver enough energy quickly to meet performance demands and efficiency.

Question 2: Describe a scenario in daily life where increasing power transfer could improve efficiency or performance.

Answer: Using a more powerful blender can reduce blending time, making food preparation faster and more efficient.

Question 1: A construction crane lifts a 2000 kg load to a height of 30 meters in 2 minutes. Calculate the power developed by the crane during this operation. Assume gravity is 9.8 m/s^2. Show all your steps.

Answer: Work done = mass × gravity × height = 2000 kg × 9.8 m/s^2 × 30 m = 588,000 Joules. Time = 2 minutes = 120 seconds. Power = Work / Time = 588,000 J / 120 s = 4900 W or 4.9 kW. This indicates the crane's rate of energy transfer during lifting.