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Westkost [7]
3 years ago
6

98 POINTS, 5 simple questions!! HELP

Physics
2 answers:
kondor19780726 [428]3 years ago
6 0

This is a fun question - your science teacher is creative!

First is easy, 25000 feet converts to 7620 meters

Potential energy is a product of mass, gravity and height. In this case, mass is 90Kg and height is 7620m. gravity on earth is 9.8m/s2.

Potential energy = 90(9.8)(7620) = 6720840J


By Newton 2nd law, force is equal to mass times acceleration.

Gravity force = mass*gravity

= 90(9.8) = 882N


Acceleration when he leaves the plane is gravity, 9.8m/s2


With no wind resistance, the acceleration is constant at 9.8.

Using kinematic equation, v2 = u2 + 2as where u is initial velocity, v is final velocity, a is acceleration and s is distance traveled.

In this case, u=0, a=9.8, s=7620

v^2 = 2(9.8)(762) = 149352

final velocity = sqrt (149352) = 386.5m/s


lozanna [386]3 years ago
3 0

25,000 Feet = 7620m

PE = mgh where m is mass, g is gravity accel: 9.8 n h is height

= 90 x 9.8 x 7620

= 6720840J

= 6.72MJ

F = ma where m is mass, a is accel = gravity = 9.8

= 90 x 9.8

= 882N

Accel = gravity = 9.8m/s^2

KE = 1/2mv^2 where m is mass n v is vel

if no wind resistance, PE leaving airplane = KE at net

6720840 = 1/2 x 90 x v^2

v^2 = 149352

v = 386.5m/s


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Answer:

Mass of the ring is 2.5 kg.

Given:

Moment of inertia of a ring = 0.4 kg.m^{2}

Radius = 40 cm = 0.4 m

To find:

Mass of the ring = ?

Formula used:

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Solution:

Moment of inertia of a ring is given by,

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