Physics, 18.03.2021 02:50 Crxymia

You normally drive a 12-h trip at an average speed of 100 km/h . Today you are in a hurry. During the first two-thirds of the distance, you drive at 116 km/h If the trip still takes 12 h, what is your average speed in the last third of the distance?

Answers: 2

Show answers

Answers

Answer from: lesleyy7278

78 km/h

Explanation:

If I normally drive a 12 hour trip at an average speed of 100 km/h, my destination has a total distance of:

100 km/h · 12 h = 1,200 km

Today, I drive the first 2/3 of the distance at 116 km/h. Let's first calculate what 2/3 of the normal distance is.

1,200 * 2/3 = 800 km

I've driven 800 km already. I need to drive 400 km more to reach my final destination. I need to figure out my average speed during this last 1/3 of the distance.

To do this, I first need to calculate how much time I spent driving 116 km/h for the past 800 km.

116 km/1 h = 800 km/? h800 = 116 · ?? = 800/116 ? = 6.89655172

I spent 6.89655172 hours driving during the first 2/3 of the distance.

Now, I need to subtract this value from 12 hours to find the remaining time I have left.

12 h - 6.89655172 h = 5.10344828 h

Using this remaining time and my remaining distance, I can calculate my average speed.

? km/1 hr = 400 km/5.10344828 h 5.10344828 · ? = 400 ? = 400/5.10344828 ? = 78.3783783148

My average speed during the last third of the distance is around 78 km/h.

Answer from: Quest

answer: question1

1,000 tons

question2

3: 8

question 3

store d

step-by-step explanation:

Answer from: Quest

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by mathematical calculations before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of uranus led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.

Another question on Physics

Physics, 21.06.2019 14:30

Several processes form metal ore. match each process to its description. volcanic activity weathering hydrothermal energy rocks break down as they interact with air and water. arrowright density differences and other factors cause metals to concentrate in igneous rocks. arrowright seawater heats up from contact with hot rock, and metals dissolve in it. the water rises and contacts cooler water, causing metal ores to settle on the ocean floor. arrowright

Answers: 2

Answer

Physics, 22.06.2019 03:00

Which boundary is associated with the building of the himalaya mountains? convergent transform divergent hot spot

Answers: 1

Answer

Physics, 22.06.2019 09:00

When a light bulb shines, it gives off light energy and energy. a. heat b. potential c. chemical d. electrical

Answers: 2

Answer

Physics, 22.06.2019 14:40

What is the orbital period of a spacecraft in a low orbit near the surface of mars? the radius of mars is 3.4×106m.