T 6.1.2 Exam: Semester Exam Question 21 of 28
How are radar and an approaching siren alike? How are they different?
O A. Both use sound waves, but the Doppler effect can be observed
only in the approaching siren.
O B. Both exhibit the Doppler effect, but radar uses radio, and the siren
uses sound waves.
O C. Both exhibit the Doppler effect, but radar uses sound waves, and
the siren uses radio.
O D. Both use sound waves, but the Doppler effect can be observed
only with radar.
SUBMIT

Click the game tab at the bottom of the simulation and select level 1. (there is no seesaw balance for this part of the activity.) balance the first equation, and click check to see if you got it right. if you can’t balance it in the first try, you can try again. work through the five equations for level 1. click continue to go on to level 2, and later level 3. each level is more difficult than the one before. keep trying until all the equations are balanced. in one or two sentences, describe how you did in the balancing game. in a few more sentences, explain one strategy you learned for balancing more complex equations.

What practical value did astronomy offer to ancient civilizations?

Which statements did both aristotle and ptolemy assume? check all that apply.