What property of a wave remains unchanged when a wave enters a different medium?

The pressure exerted by 15m of liquid is 1500pa. The acceleration due to gravity g=10m/s^2. Calculate the density liquid.

What is the unit of density

How does energy travel in a mechanical wave? in a medium in space in time in a vacuum

a 0.10kg piece of copper at an initial temperature of 95C is dropped into 0.20kg of water contained in a 0.28kg aluminum calorimeter. the water and calorimeter are initially at 15C.

What happens to the kinetic energy of a body when: a) the mass of the body is doubled at constant velocity? b) the velocity of the body is doubled at constant mass? c) the mass of the body is doubled but the velocity is reduced to half?

A 55kg cart is pushed by a force of 225 n. what is the carts acceleration?

F we wanted to compare muscular endurance between a very large person and a very small person, what method would be the best method to use? a. absolute method b. maxing out c. callisthenic method d. fixed percentage of rm method

After creating a question and forming a hypothesis, what is the next step in the scientific method

Roger sees water balloons fall past his window. He notices that each balloon strikes the sidewalk 0.51 s after passing his window. Roger's room is on the second floor, 10 m above the sidewalk.

Which statements accurately describe the Doppler effect?