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3 years ago

At the equator earth rotates with a velocity of about 465 m/s.

Physics

2 answers:

oee [108]3 years ago

7 0

a. This velocity in kilometers per hour is 1674 km/h

b. This velocity in kilometers per day is 40176 km/day

<h3>Further explanation</h3>

Acceleration is rate of change of velocity.

$\large {\boxed {a = \frac{v - u}{t} } }$

$\large {\boxed {d = \frac{v + u}{2}~t } }$

<em>a = acceleration ( m/s² )</em>

<em>v = final velocity ( m/s )</em>

<em>u = initial velocity ( m/s )</em>

<em>t = time taken ( s )</em>

<em>d = distance ( m )</em>

Let us now tackle the problem !

If earth rotates with a velocity of about 465 m/s at the equator , then it means that earth covers 465 metres in 1 second.

465 metres = 465 / 1000 kilometres = 0.465 kilometres

1 hour = 3600 seconds → 1 second = 1 / 3600 hour

1 day = 24 hours = 86400 seconds → 1 second = 1 / 86400 hour

The velocity in kilometres per hour can be calculated as following:

$velocity = 465 ~ m \div 1 ~ s$

$velocity = 0.465 ~ km \div \frac{1}{3600} ~ h$

$velocity = 0.465 \div \frac{1}{3600} ~ km/h$

$velocity = 0.465 \times 3600 ~ km/h$

$\boxed {velocity = 1674 ~ km/h}$

The velocity in kilometres per day can be calculated as following:

$velocity = 465 ~ m \div 1 ~ s$

$velocity = 0.465 ~ km \div \frac{1}{86400} ~ day$

$velocity = 0.465 \div \frac{1}{86400} ~ km/day$

$velocity = 0.465 \times 86400 ~ km/day$

$\boxed {velocity = 40176 ~ km/day}$

<h3>Learn more</h3>

Velocity of Runner : brainly.com/question/3813437
Kinetic Energy : brainly.com/question/692781
Acceleration : brainly.com/question/2283922
The Speed of Car : brainly.com/question/568302

<h3>Answer details</h3>

Grade: High School

Subject: Physics

Chapter: Kinematics

Keywords: Velocity , Driver , Car , Deceleration , Acceleration , Obstacle , Speed , Time , Rate

Dafna1 [17]3 years ago

3 0

The given velocity is 465 m/s.

Part a.
$465 \, \frac{m}{s} =(465 \times 10^{-3} \, \frac{km}{s})*( 3600 \, \frac{s}{h} ) = 1674 \, \frac{km}{h}$
Answer: 1674 km/h

Part b.
$1674 \frac{km}{h} = (1674 \, \frac{km}{h})*(24 \, \frac{h}{day} ) = 40176 \, \frac{km}{day}$
Answer: 40,176 km/day.

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A conservative force permits a two-way conversion between kinetic and potential energies.

The work done by a nonconservative force depends on the path taken.

A potential energy function can be specified for a conservative force.

Explanation:

A conservative force is defined as a force whose work done does not depend on the path taken, but only on the initial and final position of motion.

This means that for a conservative force, it is possible to defined a potential energy function U which depends only on the position of the object. An example of conservative force is gravity: the gravitational potential energy of an object, in fact, depends only on its position in the field, not on the path taken.

This behaviour also implies that when an object moves from A to B and then back from B to A, the potential energy gained (or lost) moving from A to B is lost (or re-gained) when moving from B to A. This means that the total mechanical energy (sum of kinetic energy and potential energy) of the object is conserved, and therefore there is a constant conversion between potential and kinetic energy during the motion.

A non-conservative force instead does not show this properties, as the work done by it depends on the path taken, and therefore it is not possible to define a potential energy function. An example of non-conservative force is friction.

According to what we wrote above, therefore, the only correct statements are:

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The work done by a nonconservative force depends on the path taken.

A potential energy function can be specified for a conservative force.

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