Question

in a circus the diameter of globe of death is 20 m .from what minimum height must a cyclist start in order to go round the globe successfully ​

Answer 1

The minimum height must a cyclist start in order to go round the globe successfully is 25 m.

Explanation:

Given that,

Diameter = 20 m

We need to calculate the velocity

Using conservation of energy

Loss of P.E = Gain of K.E

$mgh=\dfrac{1}{2}mv^2$

$v=\sqrt{2gh}$

For looping the loop,

The minimum velocity at the lowest point is

$v = \sqrt{5gr}$

Put the value of v in the formula

$\sqrt{2gh}=\sqrt{5gr}$

$h=\dfrac{5gr}{2g}$

Put the value into the formula

$h=\dfrac{5\times10}{2}$

$h=25\ m$

Hence, The minimum height must a cyclist start in order to go round the globe successfully is 25 m.

Learn more :

Topic : conservation of energy

https://brainly.in/question/7729530

Answer 2

Explanation:

The minimum height must a cyclist start in order to go round the globe successfully is 25 m.

Explanation:

Given that,

Diameter = 20 m

We need to calculate the velocity

Using conservation of energy

Loss of P.E = Gain of K.E

mgh=\dfrac{1}{2}mv^2mgh=

2

1

mv

2

v=\sqrt{2gh}v=

2gh

For looping the loop,

The minimum velocity at the lowest point is

v = \sqrt{5gr}v=

5gr

Put the value of v in the formula

\sqrt{2gh}=\sqrt{5gr}

2gh

=

5gr

h=\dfrac{5gr}{2g}h=

2g

5gr

Put the value into the formula

h=\dfrac{5\times10}{2}h=

2

5×10

h=25\ mh=25 m

Hence, The minimum height must a cyclist start in order to go round the globe successfully is 25 m.