Physics

The volume of a substance must be measured several times during an experiment Which units should be used to measure the volume of the substance? centimeters milligrams kelvins liters

What is the basic unit of matter? atom molecule gas compound

Which statement describes how rays behave when they travel through media during reflection and refraction? During refraction, rays stay in the original medium and during reflection, rays pass into a new medium. During reflection, rays stay in the original medium,and during refraction, rays pass into a new medium. During reflection and refraction rays stay in the original medium. During reflection and refraction rays pass into a new medium.

Light strikes a smooth wooden tabletop. What happens to the light after it is reflected? The light rays bounce off the table and all move in the same direction. The light rays bounce off the table and move in different directions. The light rays pass through the table and all move in the same direction. The light rays pass through the table and move in different directions.

The Earth's gravity keeps everything in place in our solar system. True False

Lower air density means there are more oxygen molecules. True False

Dierdra began writing a summary of the relationship between the first and second laws of thermodynamics. Thermal energy in a system is conserved and can increase the system's internal energy andlor be used to do work. Which best completes Dierdra's summary? Thermal energy moves from cooler objects to warmer objects Thermal energy moves from warmer objects to cooler objects. Thermal energy is destroyed when it leaves the system. Thermal energy is created when it enters the system.

Which best describes a characteristic of an adiabatic process? Heat is absorbed but not released by the system. All heat added to the system is transformed into work. There is a gradual shift between compression and expansion of a gas. When gas is compressed in the system, temperature remains constant.

A steam turbine is a device in which high-pressure steam enters the turbine and causes blades to spin. The spinning blades have mechanical energy. Which best describes what happens in this system? The turbine absorbs heat which creates kinetic energy in the system and produces work to turn the blades. The turbine destroys some of the thermal energy in the steam, which generates work and turns the blades. The turbine generates heat from the steam, and some of the heat creates work and turns the blades. Some of the heat used to make the steam is transformed into work as the steam pushes against the blades to make them turn.

Thermodynamics is the study of the relation;hip between thermal energy and mass. other forms of energy. types of engines. temperature.