The atomic number of an atom is defined as which of the following?

A) number of protons

B) mass in grams

C) Mass in amu

D) number of electrons

Calculate the kinetic energy of a 4 kg object traveling at 16 m/s

20-kilogram canoe is floating downriver at 2 m/s. what's the kinetic energy?

A dolphin in seawater at a temperature of 25°C emits a sound wave directed toward the ocean floor 154 m below. How much time passes before it hears an echo? (The speed of sound in ocean water is 1533 m/s.)

Ryan is experimenting with core materials for an electromagnet. he slides different for materials to a quail of current caring wire. sort the court materials based on whether they will or will not increase the strength of Ryan's electromagnet.

If you heat a magnet above a certain temperature, it will lose its magnetic field. True False

A net force of 200 newton's is applied to a wagon for 3 seconds. this causes the wagon to undergo a change in momentum of

Which of the following was a common life form during the Cambrian Period? trilobite bryozoan land plant cephalopod

a 40 kg block is being pulled at constant velocity across a horizontal surface by a 150 N force at an angle 60 above the horizontal. What is the coefficient of kinetic friction between the block and the floor

Dominoes standing in a row will fall if the first one is tipped towards the others. How does the law of convection of energy describe this?

According to the Doppler effect, objects moving away from Earth would have a cooling appearance. blue shift. red shift. warming appearance.