displacement is given by equation
now at t = 5 s the position is
similarly position at t = 9 s
so the displacement of object in given interval of time will be
time interval
now the average velocity will be given as
so its average speed is 252 m/s
Unit 2 Lesson 9: Temperature & Heat Unit Test does anyone have the answers
2 answers:
Answers:
Here are the answers for the U2L9: Temperature & Heat Unit Test
1. Which describes how radiation moves?
B) Radiation moves from a warmer object to a cooler object
2. Which material most likely gets warmer when places in the Sun?
C) brown mulch
3. A thermogram of a house shows high amounts of thermal energy around the windows but not around the roof. Which conclusion is best supported by the thermogram?
C) The windows are not energy efficient, but the roof is.
4. Which best describes convection?
D) It is driven by temperature differences within a fluid.
5. A student heats a liquid on a burner. What happens to the portion of liquid that first begins to warm?
Any answer you choose is correct on Connexus (look at the screenshot)
6. Convection only occurs in ____.
B) fluids
7. Conduction involves the transfer of electric charge or ____.
A) thermal energy
8. A scientist designed a foam container to help keep frozen foods from melting. Which best explains how the foam works?
D) It reduces the amount of thermal energy that is transferred from the inside to the outside of the container.
9. The diagram shows movement of thermal energy. In which areas of the diagram does conduction occur? (look at the screenshot)
B) X and Z
10. Nuclear reactions in a reactor produce a lot of thermal energy. That energy then flows and warms up water, which boils and produces steam. The stream then turns turbines that generate electricity. Which statement below can be made about the production of electricity in a nuclear reactor?
B) Heat flows from the reactor to the water.
11. A stovetop burner on medium reaches 200° C. Which other objects will heat from the burner flow to?
Any answer you choose is correct on Connexus (look at the screenshot)
12. Heat transfer between two substances is affected by specific heat and the
D) amount of time and area of physical contact between the substances.
13. Which of these results in kinetic energy of an object?
B) motion
14. Carmen is heating some water and trying to measure the temperature of water using a Celsius thermometer. Which measurement can she expect once the water begins to boil?
B) 100° C
15. Which shows the formula for converting from degrees to Celsius to degrees Fahrenheit?
A) °F = (9/5 × °C) + 32
16. Which of these indicates that a liquid has transferred thermal energy to the air?
D) The liquid decreases in temperature, and its particles lose kinetic energy.
I took the test ALL of these answers are 100% correct on Connexus (they should be the same for everyone tho)
You're welcome and hope this helps!! :)
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