8. Which best explains why we see different phases of the Moon? a) Clouds block the Moon b) The Moon changes shape c) We see different parts of the Moon's sunlit side as it orbits Earth d) The Sun moves around the Moon 9. What does Hubble's red shift show about the universe? a) The universe is shrinking b) The universe is not moving c) The universe is expanding d) The universe is spinning 10. What would happen if there was no inertia? a) Planets would keep moving in a straight line forever b) Planets would fall straight into the Sun c) Planets would stop moving d) Planets would orbit backwards

From the NOAA links:in which year did solar cycle maximum \#23 occur? And what was the observed number of sunspots in this cycle? $2005;100$ $1995;180$ $2001;240$ $2015;210$

20. What is the difference between a short circuit and an open circuit?

3 Formula If 75.6 mC of charge flow through a segment of wire in 31.1 ms , then what is the current in the wire? Answer $\square $ 1 point

A car moving at $35.2m/s$ accelerates uniformly to $45.0m/s$ over 2.25 s. What is the acceleration of the car? $a=[?]m/s^{2}$

Question 20 (Essay Worth 8 points) (04.05 HC) Explain what happens when nuclear fission occurs. Provide two disadvantages of this reaction? Make sure to be specific when mentioning atoms.

For this discussion, review your readings for Module 6.1. You must complete your post before you can see what other students have posted. In your post include the following: 1. Describe what are the Physics principles "behind" the ultrasound machines used in medical diagnostics? Use full and complete sentences in your answer. 2. Use the values for density and the speed of ultrasound given in College Physics: Chapter 17 Section 7>Table 175. and calculate the acoustic impedance of blood and bones. 3. Compare your results with those provided in Table 17.5. and answer the following question: are your values close to those given? Explain your answer and show your calculations. Use the D2L Math Editor if necessary. 4. Conclude by saying what you learned from this exercise.

Under which conditions are the principles of relativity and uncertainty better suited than Newtonian physics for describing the motion of objects? A. Very small objects moving at close to the speed of light B. Objects that are accelerating C. Objects at rest D. Very large objects moving at slow speeds

Blotchy appearance caused by an insufficient number of photons reaching the image receptor is known as: (Select three) Ambient noise D Quantum noise Quantum mottle Photon starvation

Which one of the following words is the most appropriate option for fill in the blank: height, depth, distance? Screws are used to move objects to a greater $\square $ with less force.

Newton's third law is also known as the law of __ conservation coexistence force inertia