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3 years ago

What is speed in your own words

Physics

2 answers:

KatRina [158]3 years ago

6 0

Answer:

speed is defined as distance travelled per unit time

KatRina [158]3 years ago

3 0

Answer: Speed is the measure of how fast an object is moving.

Explanation: Speed is expressed as the ratio of the distance travelled per unit time.

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Rest energy is the energy a body has due to its position at rest.<br> True<br> False

OleMash [197]

Answer: The answer is True

8 0

3 years ago

Read 2 more answers

A large turntable with radius 6.00 m rotates about a fixed vertical axis, making one revolution in 8.00 s. The moment of inertia

yanalaym [24]

Answer:

0.8024

Explanation:

From the given question; we can say that the angular momentum of the system is conserved if the net torque is is zero.

So; $I_o \omega _o = I_2 \omega_2$

At the closest distance ; the friction is :

$f_s = \mu_s (mg)$

According to Newton's Law:

F = ma

F = mrω²

From conservation of momentum:

$I_o \omega _o = I_2 \omega_2$

$\omega_2= \frac { I_o \omega _o}{ I_2 }$

$\omega_2=( \frac { I_1+ mr_o^2}{ I_1 + mr^2 })* \omega_o$

However ; since the static friction is producing the centripetal force :

$\mu_s (mg) = mr \omega_2^2$

$\mu _s = \frac{ \omega^2_2 *r }{g}$

The coefficient of static friction between the bottoms of your feet and the surface of the turntable can now be calculated by using the formula :

$\mu _s = \frac{ \omega^2_2 *r }{g}$

= $( \frac { I_1+ mr_o^2}{ I_1 + mr^2 })^2 * \frac{ \omega^2_o *r }{g}$

= $[\frac{1200+(73(6)^2)}{((1200)+(73)(3)^2)} ]^2*[\frac{(\frac{\pi}{4})^2(3)} {9.8}]$

= 0.8024

4 0

3 years ago

A uniform thin film of material of refractive index 1.40 coats a glass plate of refractive index 1.55. This film has the proper

Alexeev081 [22]

Answer:

31.25 year .

Explanation:

The thickness of layer must change so the destructive interference may be converted into constructive interference . This can happen if thickness is reduced by λ /4 , so that path difference changes by 2 x λ /4 = λ /2 .

This will convert destructive to constructive interference.

change in thickness required = λ /4

= 525 / 4 nm

= 131.25 nm .

year required to wear off

= 131.25 / rate of decay

= 131.25 / 4.2

= 31.25 year .

4 0

3 years ago

PLEASE HELP

GREYUIT [131]

Answer:

h = 1.8 m

Explanation:

The initial velocity of the glove, u =- 6 m/s

We need to find the maximum height of the glove. Let it is equal to h. Using equation of kinematics. At the maximum height v = 0

$v^2-u^2=2ah$ , h is the maximum height and a = -g

$0^2-(6)^2=2\times (-10)\times h\\\\h=\dfrac{36}{20}\\\\h=1.8\ m$

Hence, it will go up to a height of 1.8 m.

4 0

3 years ago

An electron (charge −e=−1.60×10−19C−e=−1.60×10−19C) is at rest at a distance 1.00×10−10 m 1.00×10−10m from the center of a nucle

shtirl [24]

Answer:

$-9.45\times10^{-16} \text{ J}$

Explanation:

According to Coulomb's law, the force of attraction between two point charges, $q_1$ and $q_2$ , separated by a distance $d$ is given by

$F = k\dfrac{q_1q_2}{d^2}$

$k$ is a constant with a value of $9\times10^9\text{ F/m}$ .

When we substitute the values from the question,

$F = (9\times10^9\text{ F/m})\dfrac{(-1.60\times10^{-19} \text{ C})\times(+1.31\times10^{-17}\text{ C})}{(1.00\times10^{-10}\text{ m})^2} = -1.89\times10^{-6} \text{ N}$

This value is negative because it is in a direction towards the positive charge.

The work done in moving the electron from the nucleus is

$W = F\times r$

$W = (-1.89\times 10^{-6} \text{ N})\times(5.00\times10^{-10}\text{ m}) = -9.45\times10^{-16} \text{ J}$

This is negative because work is done on the electron, not by it.

3 0

3 years ago