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xz_007 [3.2K]
3 years ago
11

A certain race track is four and a half kilometers long. The winning driver in the race drove his car around the track TWICE in

three minutes. What was his average speed over those two laps? Please answer in kilometers per hour.
HELP!!!!!!!!! BRAINLIEST!!!!!!!!!!
Physics
1 answer:
Vika [28.1K]3 years ago
4 0

he drove 3 kilometers every minute

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Describe five things that you do to make yourself feel warmer or cooler.
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Buy a fan or heater, get a blanket, take a shower, go outside, go by the fireplace
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3 years ago
Once a disk forms around a star, the process of planetary formation can begin. Rank the evolutionary stages for the formation of
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Answer: See explanation

Explanation:

The evolutionary stages for the formation of planets from earliest to latest will be:

1. Dust keeps matter inside the disk cool enough for planet formation to start

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2 years ago
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6 0
2 years ago
Read 2 more answers
How much heat energy (in megajoules) is needed to convert 7 kg of ice at -9°C C to water at 0°C?
Molodets [167]

Answer:

hence option A is correct

Explanation:

heat required from -9°C to 0°C ice = mass × specific heat of ice ×change in temperature

heat required from -9°C to 0°C ice = 7×2100×9 =132300 J =0.1323 MJ

( HERE SPECIFIC HEAT OF ICE IS A CONSTANT VALUE OF 2100

J/(kg °C )

heat required from  0°C ice to 0°C water = mass× specific heat of fusion of ice

                                                             = 7×3.36×10^5

                                                              = 2.352 × 10^6 J

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TOTAL HEAT ENERGY REQUIRED = 0.1323 MJ +2.352 MJ

                                                          = 2.4843 MJ

hence option A is correct

5 0
3 years ago
The thermal energy of a container of helium gas is halved. what happens to the temperature in kelvin
xxTIMURxx [149]
Thermal energy quantifies the amount of heat present in the body and is calculated through the equation,

   H = mcpdT

where H is the heat, m is the mass, cp is the specific heat, and dT is the temperature difference. If all things are constant, and the thermal energy is halved then, dT should also be reduced to half. 
5 0
3 years ago
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