the circumference of the train's wheel is 3m if the train move at the speed of 48KM/H the how many times the wheel of train rotate in 1 minutes
Answers
Answer:
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Step-by-step explanation:
Introduction
Have you ever watched a train roll by? If so, you might have wondered how the train is able to stay on its tracks. The secret lies in the train's wheels. Although they seem cylindrical at first glance, when looking more closely you will notice that they have a slightly semi-conical shape. (Of course, never get close to a working train!) This special geometry is what keeps trains on the tracks. In this activity you will put different wheel shapes to the test to find out why the conical wheel is superior to other designs.
Background
The wheels on each side of a train car are connected with a metal rod called an axle. This axle keeps the two train wheels moving together, both turning at the same speed when the train is moving.
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This construction is great for straight tracks. But when a train needs to go around a bend the fact that both wheels are always rotating at the same rate can become a problem. The outside of a curve is slightly longer than the inside, so the wheel on the outside rail actually needs to cover more distance than the wheel on the inside rail. You can demonstrate this by drawing a train track—consisting of the two rails—with a turn on a piece of paper. Take a measuring tape (or string and ruler) and measure the length of each line.
Take two cups and tape them together with their bases facing each other. This is your first cup setup.
Take the other two cups and tape them together with their tops facing each other. This is your second cup setup. Can you describe the differences between the shapes of the first and second cup setup? How do they look similar or different? Which one looks more stable to you?
Set up a model railroad track with the two rulers or yardsticks and your book or box. Place the rulers in parallel with one side on the book and the other on the work surface, creating an incline. Stand the rulers up on their sides so that the long narrow sides are pointing up and that you will be able to fit each of the cup setups across the track. Tape the rulers securely in place.
Procedure
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Carefully place the first cup setup across the track at the top of the slope. Try to place it as close to the center as possible. Why would it matter how you place the cups on the track?
Let go of the cup setup, and let it roll down the track. What do you notice? How does this cup setup behave on the track?
Repeat this step several times, and observe what happens to the cup setup on the track each time. Do you always get the same results?
Place the second cup setup onto the tracks. Again try to place it in the very center of the track.
Let the cup setup roll down the track. What happens this time? Are the results similar or different compared to the previous cup setup?
Repeat this step several times and again observe what happens each time. Do your results change with several attempts or are they always the same?
Take the first cup setup again, and place it on the tracks. This time place it there off-center. Shift it either slightly to the left or the right. Do you think this changes your results?
Let go of the cup setup, and let it roll down the track. Does it make it all the way down the tracks without falling off?
Take the second cup setup, and place it on the track. Again place it slightly off-center either to the left or right. Do you think they will fall off the tracks?
Let the cup setup roll down the track. What do you observe? Can you explain your observations?
Extra: Use construction paper or cardboard to design other wheel geometries. For example try a cylindrical shape. How does this design