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3 years ago

Which Sl units are combined to describe energy?

Physics

1 answer:

azamat3 years ago

5 0

Answer:

kilograms and m²/s²

Explanation:

The SI units combined to describe energy is kilograms and m²/s² ;

Energy can be derived from;

Potential energy = mgh

Units = kg x m/s² x m

= kg m²/s²

Even if we use kinetic energy, we still get kg m²/s²

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A cat rides a merry-go-round while turning with uniform circular motion. At time t1 = 2.00 s, the cat's velocity is v with arrow

goldenfox [79]

Answer:

Part a)

$a_c = 2.07 m/s^2$

Part b)

$a_{avg} = 1.32 m/s^2$

Explanation:

As we know that it makes half revolution in given time interval

so we have

$\frac{T}{2} = t_2 - t_1$

$\frac{T}{2} = 9 - 2$

$T = 14 s$

now the angular speed is given as

$\omega = \frac{2\pi}{T}$

$\omega = \frac{2\pi}{14}$

$\omega = 0.448 rad/s$

now linear speed is given as

$v = \sqrt{2.30^2 + 4.00^2}$

$v = 4.61 m/s$

now we have

$v = R \omega$

$4.61 = R(0.448)$

$R = 10.3 m$

Now centripetal acceleration is given as

$a_c = \omega^2 R$

$a_c = 0.448^2 \times 10.3$

$a_c = 2.07 m/s^2$

Part b)

Average acceleration of the cat is given as

$a_{avg} = \frac{v_2 - v_1}{\Delta t}$

$a_{avg} = \frac{2v}{\Delta t}$

$a_{avg} = \frac{2(4.61)}{9 - 2}$

$a_{avg} = 1.32 m/s^2$

7 0

4 years ago

A scientist is using a lithium ion battery to power her laptop.

Scrat [10]

The statement about the battery which is correct is; a new substance is formed as the battery is used.

Lithium ion batteries have become part of most modern devices such as cell phone, laptop computers and other digital devices.

It shorter time of recharge and good battery life has continued to make it a top choice in the electronics industry.

The equation that describes the chemistry of lithium ion battery is;

LiC6 + CoO2 ⇄ C6 + LiCoO2

The reaction goes towards right hand side when the battery is in use and towards the left hand side when that battery is recharging.

Hence, from the equation, we can see that a new substance, LiCoO2 is formed when the battery is in use.

Learn more: brainly.com/question/22885959

8 0

3 years ago

Read 2 more answers

At t = 0 the end you are oscillating is at its maximum positive displacement and is instantaneously at rest. Write an equation f

vovikov84 [41]

Answer:

The equation of displacement is $y=A\sin(\omega t-2.50 k+\dfrac{\pi}{2})$ .

Explanation:

Given that,

Distance = 2.50 m

We need to calculate the equation of wave

Using general equation of wave

$y=A\sin(\omega t-kx+\phi)$ ....(I)

Where, A = amplitude

t = time

x = displacement

$\phi$ = phase difference

Put the value in the equation

At t = 0, x = 0, y =A

$A=A\sin(0+\phi)$

$\sin\phi=1$

$\phi=\dfrac{\pi}{2}$

From equation (I)

$y=A\sin(\omega t-2.50 k+\dfrac{\pi}{2})$

Hence, The equation of displacement is $y=A\sin(\omega t-2.50 k+\dfrac{\pi}{2})$ .

7 0

3 years ago

A block of mass m rests on a frictionless, horizontal surface. A cord attached to the block passes over a pulley whose radius is

ra1l [238]

Answer:

Explanation:

Let the tension in the cord be T₁ and T₂ .

for motion of block placed on horizontal table

T₁ = m a , a is acceleration of the whole system .

for motion of hanging bucket of mass m

mg - T₂ = ma

adding the two equation

mg + T₁- T₂ = 2ma

for rotational motion of the pulley

torque = moment of inertia x angular acceleration

(T₂ - T₁) R = I x α , I is moment of inertia of pulley , α is angular acceleration .

(mg - 2ma ) R = I x α

(mg - 2ma ) R = I x a / R

(mg - 2ma ) R² = I x a

mgR² = 2ma R² + I x a

a = mgR² / (2m R² + I )

Since body moves by distance d in time T

d = 1/2 a T²

a = 2d / T²

mgR² / (2m R² + I ) = 2d / T²

mgR²T² = 2d x (2m R² + I )

mgR²T² - 4dm R² = 2dI

m R² ( gT² - 4d ) = 2dI

I = m R² ( gT² - 4d ) ] / 2d .

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3 years ago

Which statement about the reaction is correct?

balu736 [363]

Answer:

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3 years ago