Humans can hear frequencies as low as 21 hz. if sound is measured during 3 seconds how many wavelengths pass?

If the wheels lock when braking suddenly the vehicle: a: loses traction b: lose steering wheel ability c: gain speed slightly d: gain steering ability

You hang a book bag on a spring scale and place the bag on a platform scale so that the platform scale reads 23.7n and the spring scale reads 13.8n. what is the magnitude of the force that earth exerts on the bag?

Acalorimeter uses the principle that thermal energy flows from hotter material to colder material until both reach the same