How do we know the universe is a closed system?

Which of the following is a function of the brain?

Are there electrical appliances at home that don't use transformers? If yes, state a few examples of them.

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When an automobile moves with constant velocity, the power developed is used to overcome the frictional forces exerted by the air and the road. If the engine develops 40 hp, what total frictional force acts on the car at 140 mph

Your town is considering building a nuclear power plant. Describe at least two advantages and two disadvantages of this project. Based on these factors would you recommend that they continue with the project or consider other options?

What is the speed of a plane that traveled 1500 km in 2.5 hours? How far would that same plane travel in eight hours if it maintained a constant speed?

A 75 W lightbulb is being run on a 110 V outlet. Determine the resistance of the lightbulb. Provide a detailed description of the process.

A circuit contains two 1.5 volt batteries and a bulb with a resistance of 3 ohms. Calculate the current.

What type of friction acts when the books are at rest but a force is exerted?

What is 0.002 represented by