All categories

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.

You might be interested in

Vector → A points due north and vector → B points due west. Both vectors have the same magnitude. Which of the following vectors

-BARSIC- [3]

Answer:

B - A

Explanation:

For the combination of 2 vector to due southwest, 1 vector must due south and the other vector due west. Since vector B is already due west, vector A should due south. As vector A is already due north, vector -A would due south. So the combination of B + (-A) or B - A should points southwest

5 0

2 years ago

Which of the following are true statements? A. Like charges repel B. Unlike charges repel C. Unlike charges attract or D. Charge

Brums [2.3K]

Answer: The correct answers are (A) and (C).

Explanation:

The expression from electrostatic force is as follows;

$F=\frac{kq_{1}q_{1}}{r^{2} }$

Here, F is the electrostatic force, k is constant, r is the distance between the charges and $q_{1},q_{1}$ are the charges.

The electrostatic force follows inverse square law. It is inversely proportional to the square of the distance between the charges. It is directly proportional to the product of the charges.

Like charges repel each other. There is a force of electrostatic repulsion between the like charges. Unlike charges attract each other. There is a force of electrostatic attraction between unlike charges.

The charges are induced on the neutral object when it is placed nearby the charged object without actually touching it.

Therefore, the true statements from the given options are as follows;

Like charges repel.

Unlike charges attract.

7 0

3 years ago

The stress force that causes a mass of rock to pull or twist in opposite directions in called ______.

Ilya [14]

The stress force that causes a mass of rock to pull or twist in opposite directions in called shearing. Shearing forces<span> are unaligned </span>forces<span> pushing one part of a body in one direction, and another part of the body in the opposite direction. Hope this answers the question.</span>

4 0

3 years ago

Read 2 more answers

Given that the frequency of an EM wave is 4THz, what is its wavelength?

Vilka [71]

Answer:

The wavelength of the EM wave is 7.5 * 10⁻⁴ m

Explanation:

The velocity of a wave is related to its wavelength by the following formula;

velocity = wavelength * frequency

For an electromagnetic (EM) wave, its velocity is equal to the velocity of light, c = 3.0 * 10⁸ m/s

Given that the frequency and veloity of the given EM wave in the question is known, its wavelength is calculated as follows:

wavelength = velocity/frequency

where velocity of the EM wave = 3.0 * 10⁸ m/s;

frequency = 4THz = 4 * 10¹² Hz

wavelength = 3.0 * 10⁸m/s / 4 * 10¹² Hz

wavelength = 7.5 * 10⁻⁴ m

Therefore, the wavelength of the EM wave is 7.5 * 10⁻⁴ m

8 0

3 years ago

A Texas cockroach of mass 0.117 kg runs counterclockwise around the rim of a lazy Susan (a circular disk mounted on a vertical a

kozerog [31]

Answer

given,

mass of cockroach = 0.117 Kg

radius = 17.3 cm

rotational inertia = 5.20 x 10⁻³ Kg.m²

speed of cockroach = 1.91 m/s

angular velocity of Susan (ω₀)= 2.87 rad/s

final speed of cockroach = 0 m/s

Initial angular velocity of Susan

L_s = I ω₀

L_s = 5.20 x 10⁻³ x 2.87

L_s=0.015 kg.m²/s

initial angular momentum of the cockroach

L_c = - mvr

L_c = - 0.117 x 1.91 x 0.173

L_c = - 0.0387 kg.m²/s

total angular momentum of Both

L = 0.015 - 0.0387

L = - 0.0237 kg.m²/s

after cockroach stop inertia becomes

I_f = I + mr^2

I_f = 5.20 x 10⁻³+ 0.117 x 0.173^2

I_f = 8.7 x 10⁻³ kg.m²/s

final angular momentum of the disk

L_f = I_f ω_f

L_f = 8.7 x 10⁻³ x ω_f

using conservation of momentum

L_i = L_f

-0.0237 =8.7 x 10⁻³ x ω_f

$\omega_f = \dfrac{-0.0237}{8.7 \times 10^{-3}}$

$\omega_f = -2.72\ rad/s$

angular speed of Susan is $\omega_f = -2.72\ rad/s$

The value is negative because it is in the opposite direction of cockroach.

$|\omega_f |= 2.72\ rad/s$

b) the mechanical energy is not conserved because cockroach stopped in between.

7 0

3 years ago