Desarrolla y justifica cada una de las siguientes preguntas:

1. Cuando se habla de la velocidad media, nos referimos a un movimiento:
a) Uniforme
b) Variado y uniforme.
c) Variado.
d) Son falsas las anteriores afirmaciones
¿Por que ?
2. La línea que dibuja un móvil en su movimiento se llama:
a) Línea del movimiento.
b) Trayectoria.
c) Camino recorrido
d) Vector de posición.
¿Por que?
3. Para que un sistema de referencia sea válido tiene que estar:
a) Siempre en reposo.
b) Siempre en movimiento.
c) En reposo para movimientos terrestres.
d) Ninguna de las anteriores.
¿Por que?

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

1. how much energy is needed to raise the temperature of 40.0 g of argon from 25c to 40c? the specific heat capacity of argon is 0.520 j/(g·k) 2a. 23.0 ml of 0.100 m hcl (standard) are added from a buret to neutralize 50.0 ml of an unknown basic solution. 2b. if the oh- produced in the previous reaction came from ca(oh)2, then what is the molarity of the ca(oh)2? 3.calculate the new freezing-point of a solution when 60.5 grams of cacl2 solute is dissolved in 0.612 kg of water. 4. what is the maximum number of moles of alcl3 that can be produced from 5.0 mol al and 6.0 mol cl2? 5. a sample of oxygen gas has a volume of 150 ml when its pressure is 0.923 atm. if the pressure is increased to 0.987 atm and the temperature remains constant, what will the new volume be? 6. nitrogen gas in a closed container at a temperature of 100.0 oc and 3.0 atm is heated to 300 oc. what is the pressure of the gas at the higher temperature?

Which best describes how fluids change as they travel through different portions of the convection currents? they change to solids at the outer portion of the convection currents. they change to solids at the inner portion of the convection currents. they become more dense at the outer portion of the convection currents. they become more dense at the inner portion of the convection currents