13 articles trouvés pour ce sujet.
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The angular speed of a wheel |
2020-09-03 |
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Catrina pose la question : A car is moving at a rate of 75 miles per hour, and the diameter of its wheels is 2.6 in. Find the angular speed of the wheels in radians per minute. Penny Nom lui répond. |
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A dot on a child's car wheel |
2019-04-28 |
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julia pose la question : A wheel of a child’s car revolves at 10 rpm. A painted dot on the circumference of the wheel is 12 cm from the centre of rotation of the wheel. How far does the dot travel in 5 s, to one decimal place? Penny Nom lui répond. |
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Angular velocity |
2018-12-05 |
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Kolade pose la question : Krusty the Clown and Sideshow Bob have covered themselves in velcro, and shot themselves out of a large
cannon so that they stick to a huge rotating velcro wheel (don’t try this at home). As shown in Figure 1(a),
Krusty is now stuck to a point 3.00 m from the center of the wheel while Bob is stuck to another point 5.00 m
from the center. The wheel is rotating counterclockwise at 10.0 rpm. Conveniently a set of axes is suspended
just in front the wheel (Krusty asked for axes, like the ones you would use to chop wood, so that he and Bob
could chase each other with them in the usual wholesome entertainment he is known for. Unfortunately, the
set designer misunderstood.) The axes do not rotate with the wheel.
(a) Find Krusty’s and Bob’s angular velocities, in radians per second. Penny Nom lui répond. |
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A rotating wheel |
2018-08-24 |
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Kay pose la question : A wheel with a radius of 7 inches is rotating at 4 revolutions per second. What is the
linear speed v, in feet per second? p lui répond. |
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Revolutions per minute |
2014-10-24 |
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Edward pose la question : Hello; I have a 28.2 inch diameter tire; do not worry about engine RPM or gear ratios, please tell me what the RPM
of that tire is at 8 MPH and 64 MPH. Thank you.
Sincerely; Edward Penny Nom lui répond. |
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Riding on a Ferris wheel |
2014-03-21 |
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Claire pose la question : A Ferris wheel has a radius of 72 feet and its center is 85 feet above the ground. At the top of the Ferris wheel, Sam is in the topmost car. If the Ferris wheel makes two complete revolutions per minute, how high above the ground will Sam be after 10 seconds? Penny Nom lui répond. |
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A rolling wheel |
2009-03-29 |
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Jules pose la question : How far does a wheel of radius 2 feet roll along level ground in making
300 revolutions? Penny Nom lui répond. |
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The speed of a tire in revolutions per minute |
2009-03-28 |
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Jules pose la question : Suppose that a tire on a car has an outer diameter of 2,5 feet. How many
revolutions per minute does that tire make when the car is travelling 60
miles per hour? (hint:first find the angular velocity in radians per minute.) Harley Weston lui répond. |
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I need to rebuild a wagon wheel |
2007-10-26 |
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Pat pose la question : I need to rebuild a wagon wheel, the metal wheel rim is 41" diameter, inside the rim is a one and a half inch by one and a half inch wood wheel.
I thought I would glue up a hexagon from a 2x6 or 2x8 piece of wood and then draw and cut out the 41" diameter wood circle.
? what would work better the 2x6 or the 2x8 and what is the lenghth of the cuts needed in order to give me the 41' diameter I need. Harley Weston lui répond. |
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Rotational energy needs |
2007-08-29 |
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will pose la question : how much energy in KW do i need to start and subsequently rotate a 4 ton fly wheel of 1 metre radius at 12 rpm? Stephen La Rocque lui répond. |
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What angle does the tire turn in 60s? |
2007-06-04 |
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San pose la question : An automobile, travelling at 80km/h, is towing a trailer. The wheels of the trailer
are 40cm in diameter. Through what angle does the tire turn in 60second? Stephen La Rocque lui répond. |
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Trig - Ferris wheel |
2007-02-13 |
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Anthony pose la question : A ferris wheel is 250 feet in diameter and revolves every 40 seconds when in motion. Your step up to seat on the wheel at the bottom 2 feet above the ground so you are sitting 4 feet above the ground to start. Derive the formula for the height of your seat at time (t). If I go three times around, how long is the ride in ditance traveled? Stephen La Rocque and Penny Nom lui répond. |
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Spins of a roulette wheel |
2001-03-02 |
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Bob pose la question : Here's a problem I'm working on myself.....If you look at six consecutive spins of a roulette wheel, how many combinations of red and black are possible? I.E. BRRBRB, BBBBBR, BBRRRB......ETC..... Claude Tardif lui répond. |
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