8. which of the following statements regarding the moon is correct?
a. the moon's surface doe...
Engineering, 19.11.2019 02:31 ashah1260
8. which of the following statements regarding the moon is correct?
a. the moon's surface doesn't have any craters.
b. the moon's surface exhibits active volcanism.
c. the moon is tidally locked to earth.
d. the moon's surface exhibits plate tectonic activity.
9. which physical law states that all orbits are conic sections?
a. newton's laws
b. kepler's first law
c. kepler's third law
d. kepler's second and third laws
10. in a star, nuclear fusion occurs in the
a. radiative zone.
b. photosphere.
c. corona.
d. core.
11. what's the inner core of the jovian planets made of?
a. helium gas, hydrogen gas, and rocks
b. metals, helium gas, and hydrogen gas
c. bacteria fossils, hydrogen compounds, and ice crystals
d. hydrogen compounds, solid rock, and metals
12. what's the critical error seen in the geocentric model of the solar system exhibited here?
a. the moon is positioned too close to earth
b. the sun is on the wrong sid of earth
c. the sun is positioned to revolve around earth
d. the sun is revolving in the wrong direction
13. what are the two lengths that all ellipses have (all planets)?
a. x and y axes
b. horizontal and vertical length
c. minor and major axes
d. conic and isoconic length
14. which scientist developed the heliocentric model for the solar system?
a. copernicus
b. johannes kepler
c. aristotle
d. ptolemy
15. look at the figure above. which position of the earth represents a solstice?
a. beginning of winter
b. beginning of autumn
c. beginning of spring
d. beginning of summer
16. why do the terrestrial planets lack hydrogen and helium in their atmospheres?
a. hydrogen and helium were converted to other compounds as the planets formed.
b. hydrogen and helium are present in rings around the terrestrial planets.
c. hydrogen and helium were blown away by solar wind.
d. hydrogen and helium can't be retained because the planet masses are too small.
17. which of the terrestrial planets is the largest?
a. earth
b. mars
c. venus
d. mercury
18. what must you know to solve kepler's third law, the law of periods?
a. period of the orbit
b. period of the minor axis
c. period of the major axis
d. period of the revolution around the sun
19. what does einstein's theory of relativity explain?
a. how gravity interacts with planets
b. how light interacts with moisture
c. how light interacts with gravity
d. how magnetism reverses the fields of the poles
20. which of the following lists the correct requirements for a black hole to form?
a. the star must be 10 to 28 times larger than earth's sun, and a supernova explosion must have occurred.
b. the star must be 29 times larger than earth's sun, and a supernova explosion must not have occurred.
c. the star must be 29 times larger than earth's sun, and a supernova explosion must have occurred.
d. the star must be 10 to 28 times larger than earth's sun, and a supernova explosion must not have occurred.
Answers: 3
Engineering, 04.07.2019 18:10
Fluids at rest possess no flow energy. a)- true b)- false
Answers: 3
Engineering, 04.07.2019 18:10
Give heat transfer applications for the following, (i) gas turbines (propulsion) ) gas turbines (power generation). (iii) steam turbines. (iv) combined heat and power (chp). (v) automotive engines
Answers: 1
Engineering, 04.07.2019 18:10
For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater
Answers: 3
Engineering, 04.07.2019 19:10
Asteam is contained in a rigid tank with a volume of 1 m3. initially, the pressure and temperature are 7 bar and 500 oc, respectively. the temperature drops due to cooling process. determine: (1) the temperature at which condensation begins in °c, (2) the fraction of the total mass that has condensed when the pressure decreased to 0.5 bar. (3) the volume in m3 occupied by saturated liquid at the final state?
Answers: 3
English, 04.02.2021 05:00
Mathematics, 04.02.2021 05:00
Mathematics, 04.02.2021 05:00
Mathematics, 04.02.2021 05:00
Health, 04.02.2021 05:00
Mathematics, 04.02.2021 05:00
German, 04.02.2021 05:00
English, 04.02.2021 05:00
Biology, 04.02.2021 05:00
History, 04.02.2021 05:00
Mathematics, 04.02.2021 05:00
Biology, 04.02.2021 05:00
Physics, 04.02.2021 05:00
History, 04.02.2021 05:00
Mathematics, 04.02.2021 05:00