Physics Homework Aid

Physics holds significant importance among the natural sciences, elucidating life's wonders and ranking among the most challenging subjects to master.

QuestionAI is a rich and user-friendly physics problem solver for novice physicists, enabling exploration of atomic properties and interactions, alongside molecular trajectories under various forces. Furthermore, you can delve into the mysteries concealed amidst galaxies with fellow physics enthusiasts. Boldly pose your conjectures and queries to the AI, and authoritative answers will readily emerge.

Which of these describes a normal reaction force? Air pushing against a moving object Two objects rubbing together A magnet attracting another magnet A surface pushing back on an object A rope pulling against an object

20. The following diagram part of the night sky, including the constellation Leo. The circles represent stars. The unshaded circles represent the changing positions of one celestial object over a period of a few weeks. The celestial object represented by the unshaded circles most likely is (1) a galaxy (3) Earth's moon (2) a planet (4) another star

An air horn produces sound waves at a constant frequency of 420 Hz. The wavelength of the sound waves is 0.80 m. Calculate the speed of the sound waves. __

Figure 1 shows a person sliding down a zip wire. (a) As the person slides down the zip wire the change in the gravitational potential energy of the person is 147 kJ The mass of the person is 60 kg gravitational field strength=9.8N/kg Calculate the change in vertical __ __ Change in verical height=

When electric cars are not being driven, energy stored in their batteries could be used to meet sudden peaks in electricity demand. Suggest how. [2 marks]