How many neutrons does element X have if its atomic number is 40 and its mass number is 160?

Verena is mixing a material into a beaker filled with a liquid. She notices that the material seems to disappear into the liquid. What physical property of the material is Serena most likely observing

You kick a soccer ball with a speed of 18 m/s at an angle of 43°. How long does it take the ball to reach the top of its trajectory?

Belle is walking south at an average velocity of 6 km/h. How many kilometers can she walk in three hours?

Is mud a solid or a liquid? How about pudding?

Which statement is true according to the kinetic theory? A. Only gases show random motion of particles. OB. Only gases and liquids show random motion of particles. C. Solids have a fixed shape, so they do not show random motion of particles. D.

What kind of tide is responsible for extreme tides

What does the speed of sound depend on? A. Medium that the sound travels through B. Acoustics C. Frequency of the sound D. Loudness of the sound

Which of these is not a source of the shock waves that lead to protostars?

Which kind of information is known about a person if that person's DNA is in a database? A. how old the person is B. where the person was probably born C. some diseases the person might have D. whether the person is likely to commit a crime

A science teacher ran a marathon. After the race she showed her students the silver blanket she was given to keep her warm. A group of students investigated how the colour of the blanket affected how much infrared radiation is absorbed