(a) How does the phenomenon of red shift provide evidence of an expanding universe? (b) A scientist observes blue shift in the edge of a rotating galaxy. What can you conclude about the galaxy's movement?

An astronomer observes several stars and records their respective colours, as shown in Table below. Using this data, order the stars by temperature from warmest to coolest.

$$\begin{matrix} \text{Star} & \text{Colour}\\ \text{10 Lacertra} & \text{bluish}\\ \text{Antares} & \text{reddish}\\ \text{Aldebaran} & \text{orange-ish}\\ \text{Canopus} & \text{bluish white}\\ \end{matrix}$$

Which unit would be most appropriate for measuring each of the following distances? Choose between kilometers, AU, and light years. (a) the distance from the Milky Way to the Canis Major Dwarf Galaxy, (b) the distance from the Sun to Charon, one of Pluto's moons, (c) the distance from Earth's surface to the International Space Station.

Which unit of length in the metric system would be most appropriate in size for measuring each of the following items?

d. the diameter of a baseball

Ms. Sacksteader owns a grocery store. She buys 272 pounds of potatoes for $99. She wants to sell them for twice as much. She makes 9 bags containing 10 pounds each and puts the rest in 5-pound bags. Her family will eat any of the leftover potatoes. Ms. Stackheader wants to know how many 5-pound bags of potatoes she can sell.

3. What hidden question do you need to answer first? Each 5-pound bag of potatoes sells for$4.

4. How does the answer to the hidden question relate to the original question?

According to astronomers, what is a satellite?

Consider a 0.67-M solution of $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{NH}_{2}\left(K_{\mathrm{b}}=5.6 \times 10^{-4}\right).$ Calculate the pH of this solution.

A truck is moving with constant acceleration a up a hill that makes an angle $\phi$ with the horizontal. A small sphere of mass m is suspended from the ceiling of the truck by a light cord. If the pendulum makes a constant angle $\theta$ with the perpendicular to the ceiling, what is a?

Google prepares a cash budget. What is a cash budget? Why must operating budgets and the capital expenditures budget be prepared before the cash budget?

Use the component method to add the vectors $\overrightarrow{\mathbf{A}}$ and $\overrightarrow{\mathbf{B}}$. Both vectors have magnitudes of 3.00 m and vector $\overrightarrow{\mathbf{A}}$ makes an angle of $\theta=30.0^{\circ}$ with the x axis. Express the resultant $\overrightarrow{\mathbf{A}}+\overrightarrow{\mathbf{B}}$ in unit-vector notation.

A chemical reaction takes place among 3 molecular ions that have each lost 2 electrons, 2 molecular ions that have each gained 3 electrons, and 1 molecular ion that has gained 2 electrons. The products of the reaction are two neutral molecules and multiple molecular ions that each have a charge of magnitude e. How many molecular ions are produced, and are they charged positively or negatively?

Dry nitrogen gas is bubbled through liquid benzene $\left(\mathrm{C}_{6} \mathrm{H}_{6}\right)$ at $20.0^{\circ} \mathrm{C}.$ From 100.0 L of the gaseous mixture of nitrogen and benzene, 24.7 g benzene is condensed by passing the mixture through a trap at a temperature where nitrogen is gaseous and the vapor pressure of benzene is negligible. What is the vapor pressure of benzene at $20.0^{\circ} \mathrm{C} ?$

What is the diameter of a copper sphere that has the same mass as a $10 \mathrm{cm} \times 10 \mathrm{cm} \times 10 \mathrm{cm}$ cube of aluminum?

Calculate $\Delta H$ for the reaction

$$\mathrm{N}_{2} \mathrm{H}_{4}(l)+\mathrm{O}_{2}(g) \longrightarrow \mathrm{N}_{2}(g)+2 \mathrm{H}_{2} \mathrm{O}(l)$$

given the following data:

$$\begin{array}{lr} \text{ } & {\Delta \mathbf{H}}\\ \text{Equation} & \text{(kJ)}\\ \hline {2 \mathrm{NH}_{3}(g)+3 \mathrm{N}_{2} \mathrm{O}(g) \longrightarrow 4 \mathrm{N}_{2}(g)+3 \mathrm{H}_{2} \mathrm{O}(l)} & \text{-1010}\\ {\mathrm{N}_{2} \mathrm{O}(g)+3 \mathrm{H}_{2}(g) \longrightarrow \mathrm{N}_{2} \mathrm{H}_{4}(l)+\mathrm{H}_{2} \mathrm{O}(l)} & \text{-317}\\ {2 \mathrm{NH}_{3}(g)+\frac{1}{2} \mathrm{O}_{2}(g) \longrightarrow \mathrm{N}_{2} \mathrm{H}_{4}(l)+\mathrm{H}_{2} \mathrm{O}(l)} & \text{-143}\\ {\mathrm{H}_{2}(g)+\frac{1}{2} \mathrm{O}_{2}(g) \longrightarrow \mathrm{H}_{2} \mathrm{O}(l)} & \text{-286}\\ \end{array}$$