Rajay.

Using the Appendix found at the end of your textbook, determine the enthalpy of reaction for the following reaction:

P 4(s,red) + O 2(g) = P 4 O 10(s)

Choose one answer.

a. 2922.6 kJ

b. -2922.6 kJ

c. 2.9226 J Incorrect

d. -2.9226 J

e. none of the above

A sample of calcium carbonate absorbs 45.5 J of heat, upon which the temperature of the sample increases from 21.1 to 28.5 degrees Celcius. If the specific heat of calcium carbonate is 0.82 J/g*C, what is the mass in kilograms of the substance?

Choose one answer.

a. 7.5 Incorrect

b. 3.7

c. 7500

d. 3700

e. 0.0075

f. 0.0037

g. none of the above

Which of the following optics are CONVERGING? Choose all that apply.

A) A concave lens

B) A convex mirror

C) A mirror with a negative focal length

D) An optic that can only produce a virtual image

E) A convex lens

A 150 kg block weighs 330 lb on Earth. If the block were transported to a planetary body that had a SMALLER free fall acceleration (as compared to Earth), which one of the following would be TRUE?

A) The block would have the same mass but a bigger weight.

B) The block would have the same weight but a bigger mass.

C) The block would have the same mass but the same weight.

D) The block would have the same weight but a smaller mass.

E) The block would have the same mass and a smaller weight.

Which of the following will create a MAGNETIC FIELD? Choose ALL that apply.

A) An ion that is stationary.

B) A proton moving at a constant velocity of 60 mph due north.

C) An electron that is speeding up from 1000 m/s to 1200 m/s.

D) A neutron moving in a circle while traveling at a constant speed of 20 in/min.

E) A neutrino that is slowing down from 500 km/h to 400 km/h..

A closed system consists of 4 objects. The table below shows how much energy each object had to start.

Initial Energy (J):

Object A: 168

Object B: 159

Object C: 150

Object D: 158

After 123 s have passed, object A has 2 J, object B has 85 J, and object C has 48 J. How much energy does object D have?

______J

Which of the following are true about a CONCAVE MIRROR? Choose all that apply.

A) It's a real image.

B) It's a virtual image

C) The image is inverted.

D) The image is upright.

E) The mirror is converging.

If there is a concave mirror:

A. Which of the following are true? Choose all that apply.

a) It's a real image.

b) It's a virtual image

c) The image is inverted.

d) The image is upright.

e) The mirror is converging.

f) The mirror is diverging.

B. Which of the following are true? Choose all that apply.

a) The image distance is positive.

b) The image distance is negative.

c) The image height is positive.

d) The image height is negative.

e) The magnification is positive.

f) The magnification is negative.

g) The focal length is positive.

h) The focal length is negative.

If you are told an image is virtual and you know it was made by a single optic (either a lens or a mirror), which of the following must be true? Choose all that apply.

1. The image distance is positive.

2. The image distance is negative.

3. The image is inverted.

4. The image is upright.

5. The image height is positive.

6. The image height is negative.

7. The magnification of the image is positive.

8. The magnification of the image is negative.

9. It was made by a converging optic.

10. It was made by a diverging optic.

11. The focal length of the optic is positive.

12. The focal length of the optic is negative.

An object is held 62.8 cm away from a lens. The lens has a focal length of 55.8 cm

.

The image distance is 500.6057 cm, and the magnification is -7.97,

If the object is 4.6 cm long, determine the image height.

________________ cm

You are standing on a canyon edge and you give a shout. After 1.3 s have passed, you hear your echo. The temperature at the canyon is 23.6 °C.

a.) Determine the speed of sound.

_______m/s

b.) Determine how far away the cliff wall is that your voice bounced off of.

_______m

Calculate the electrostatic force between a +291 μC charge and a +671 μC charge that are 14 mm apart.

_________ N

An object is held 62.8 cm away from a lens. The lens has a focal length of 55.8 cm.

A.) Determine the image distance.

______ cm

B.) Determine the magnification.

C.) If the object is 4.6 cm long, determine the image height.

______cm

D.) Which of the following are true about the image? Choose all that apply.

1.The image is inverted.

2.The image is upright.

3.The image is real.

4.The image is virtual.

E.) Which of the following are true about the lens? Choose all that apply.

1.The lens is diverging.

2.The lens is convex.

3.The lens is converging.

4.The lens is concave.

The primary coil of a transformer has 4,578 loops. The secondary coil has 412,960 loops. The primary coil has a 80 A current and 30 V.

A.) Determine the power of the primary coil.

_______W

B.) Assuming no losses, determine the power of the secondary coil.

_______W

C.) Calculate the voltage in the secondary coil.

_______ V

D.) Calculate the current in the secondary coil.

_______ A

1.) A 50 Ω resistor has a current of 97 A passing through it. Determine the voltage drop across the resistor.

_____________ V

2.) A 50 kΩ resistor has a 60 V drop across it. Determine the current passing through the resistor.

_____________ mA

3.) A resistor has a voltage drop of 46 V when a 2.3 mA current is passing through it. Determine the resistance of the resistor.

____________ kΩ

Calculate how much a 1 m slab of concrete will expand if heated from 24 °C to 300 °C. The coefficient of thermal expansion for concrete is 12×10-6 . Express your answer in m, cm, & in. 1 in = 2.54 cm.

______m

______cm

______in

Calculate how much pressure (due to the liquid) would be on a 83 kg person if they were 123 m deep in...

a.)...freshwater.

The density of freshwater is 1000 kg/m3. Express your answer in both pascals and atmospheres. 1 atm = 1.013×105 Pa.

_____________ Pa

_____________atm

b.)...saltwater. The density of saltwater is 1030 kg/m3. Express your answer in both pascals and atmospheres. 1 atm = 1.013×105 Pa.

______________Pa

______________atm

A 40 m3 incompressible box is completely submerged in a fluid. What volume of fluid is displaced by the box if the fluid is...

A.) ...AIR? The density of air is 1.2 kg/m3.

____________m3

B.) ...MERCURY? The density of mercury is is 13.6 g/mL.

____________m3

C.) ...HELIUM? The density of helium is 0.1786 g/L.

____________m3

D.) ...WATER? The density of water is 1 g/cm3.

____________m3

The density of a 10 kg cube of gold is 19.3 g/cm3. What would the density of a 5 kg cube of gold be?

________________ g/cm3.

Which of the following are acceptable units for pressure? Choose all that apply.

kg/L

Pa

psi

kg

tons

N

atm

lb

N/m2

I know that psi and pa are both units, but are any of the rest units for pressure also? thanks.