3. Which of the following is most likely an observation of the Doppler effect that led to the discovery that the Universe is expanding?
a. When observed from a black hole, all of the stars in the Universe have
blueshifts.
b. The spectra of light given off by stars in the Milky Way Galaxy have
blueshifts.
C. When observed from Earth, light spectra from stars in other galaxies
have redshifts.
d. The spectrum of light given off by the Sun has a redshift when it is
observed from Earth.

An ideal gas is held in a container at constant volume. initially, its temperature is 5 degrees c and its pressure is 1.2 atm. what is its pressure when its temperature is 43 degrees c? answer in units of atm

While studying chemical reactions and conservation of matter, sarah's class conducted a variety of experiments. sarah and her lab partner found the mass of a wax candle and placed the candle in a flask. the students lit the candle and let it burn to completion. all that was left was wax and charred candle wick. per their teacher's instructions, the students found the mass of the products. their data can be seen in the data table. formulate a hypothesis the students could test to explain why the experiment did not support the law of conservation of matter. a) the students could repeat the experiment using different candles; there might have been a flaw in the candle. b) the experiment should be repeatable. the students should run several trials and then take an average of the after mass in each trial. c) the students should have someone in the class check their measurement skills as they repeat the experiment. they may have made an error using the balance. d) the students should burn the candle in a container that has some type of lid so that any gas that is a product of the reaction can be contained and massed. submit

What is a good example of instantaneous speed