spongebob
Where is the car when its radial acceleration is smallest?explain..
where is the car when its tangential accelerationis smallest?Explain.
When the car is at the top of the circle, is the acceleration larger than, smaller than, or the same as the acceleration of an object falling freely in a gravitational field?Explain.
Answer
The car has its smallest radial acceleration at the bottom of the circle, because the centripetal acceleration is upwards while the acceleration due to gravity is downwards; since they act in opposite directions, their magnitudes are subtractive, and total magnitude is smaller.
The tangential acceleration is greatest when the car is moving directly dowards, which occurs at the 270 degree position (if the bottom is 0 degrees and it moves through 90 degrees and then to the top at 180 degrees). This is because the centripetal acceleration has no tangential component, so the acceleration due to gravity provides the only tangential component. At 90 and 270 degrees, the downwards force of gravity is actually tangential to the direction of motion, maximizing the tangential acceleration. At 90 degrees, the car is moving upwards, so the force of gravity causes a deceleration. But at 270 degrees, the car is moving downwards and gravity causes it to speed up at its maximum rate.
At the top of the circle, the acceleration is larger than the acceleration of an object falling freely in a gravitational field, because the acceleration is equal to g + (v^2 / r), where g is the free-fall acceleration and v^2 / r is the centripetal acceleration, which will also be downwards. So as long as v is greater than zero, which it must be in order to continue moving around the circle, the acceleration will be larger than that of free-fall.
The car has its smallest radial acceleration at the bottom of the circle, because the centripetal acceleration is upwards while the acceleration due to gravity is downwards; since they act in opposite directions, their magnitudes are subtractive, and total magnitude is smaller.
The tangential acceleration is greatest when the car is moving directly dowards, which occurs at the 270 degree position (if the bottom is 0 degrees and it moves through 90 degrees and then to the top at 180 degrees). This is because the centripetal acceleration has no tangential component, so the acceleration due to gravity provides the only tangential component. At 90 and 270 degrees, the downwards force of gravity is actually tangential to the direction of motion, maximizing the tangential acceleration. At 90 degrees, the car is moving upwards, so the force of gravity causes a deceleration. But at 270 degrees, the car is moving downwards and gravity causes it to speed up at its maximum rate.
At the top of the circle, the acceleration is larger than the acceleration of an object falling freely in a gravitational field, because the acceleration is equal to g + (v^2 / r), where g is the free-fall acceleration and v^2 / r is the centripetal acceleration, which will also be downwards. So as long as v is greater than zero, which it must be in order to continue moving around the circle, the acceleration will be larger than that of free-fall.
Toys for Car Seats?
Hilly
I am going to be traveling with my baby to Florida in a few weeks. She is only 8 weeks old but hates to sleep. Any suggestions on some car seat toys that might keep her occupied? Or something that worked for anyone else on long car trips?
Answer
That seems young to travel, But I have no objections to it.
Most places that sell baby toys sell car seat toys that jingle, and have lots of colors, and are fun for the young ones to chew on, another plus is they attach to the car seat so they cant throw the toys or drop them.
But most babies fall asleep on long cars rides. It's soothing to them.
But if it's going to be sunny get sun sheilds for your windows the hot sun with bother her.
That seems young to travel, But I have no objections to it.
Most places that sell baby toys sell car seat toys that jingle, and have lots of colors, and are fun for the young ones to chew on, another plus is they attach to the car seat so they cant throw the toys or drop them.
But most babies fall asleep on long cars rides. It's soothing to them.
But if it's going to be sunny get sun sheilds for your windows the hot sun with bother her.
Powered by Yahoo! Answers
No comments:
Post a Comment