Physics

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.

A man fell I off the roof of a 150 meters tall building to his death. How many seconds would d this man travel in the air before smashing his body on ) the ground (g=9.8 m/s^2 between 4 and 5 exact 5 less than 5 less than 4

Fill in the Blank Question The process of changing the shape of the lens to view a close object is called square

Which of the following statements is TRUE about the rings of the planets? The innermost ring of Saturn is the D ring and the outermost ring is the E ring Uranus has 5 thin rings, two of which are named the Galle and Adams rings The Gossamer and Halo rings are part of the rings of Neptune Neptune has 13 thin distinct rings, one of which is named the epsilon ring The Cassini Division is a gap between the B and C rings of Saturn

A 0.0780 kg lemming runs off of a 5.36 m high cliff at 4.84m/s What is the kinetic energy of the lemming right before it reaches the ground? KE=[?]J Hint:how much potential energy is converted into kinetic energy? KE (J) square disappointed