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miss Akunina [59]

3 years ago

10

Si tengo 4litros de agua a 20C, calcula cuantos litros de agua a 32C tengo que agregar para que su temperatura de equilibrio sea

21C.

1 answer:

elena55 [62]3 years ago

6 0

Answer:

V = 0.364 litros

Explanation:

4 ltr (1000 gm/ltr) = 4000 gm

4000(20) + m(32) = (4000 + m)(21)

4000(20) + m(32) = 4000(21) + m(21)

m(32 - 21) = 4000(21 - 20)

11m = 4000

m = 363.6363...gm

363.6363 gm / 1000gm/ltr = 0.3636363... ltr

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8. A 60 kg runner has 1500 J of kinetic energy. How fast is he moving?

tresset_1 [31]

Answer: 7.07 m/s

Explanation:

Mass of runner = 60 kg runner

Kinetic energy = 1500J

Speed of runner = ?

Recall that kinetic energy is the energy possessed by a moving object, and it depends on its mass and speed by which it moves.

Hence, K.E = 1/2 x mass x (speed)^2

1500J = 1/2 x 60kg x (speed)^2

1500J = 30kg x (speed)^2

(speed)^2 = 1500J/30kg

(speed)^2 = 50

To get the value of speed, find the square root of 50

speed = √50

speed = 7.07 m/s

Thus, the runner moves as fast as 7.07 m/s

6 0

3 years ago

When two or more waves are at the same place at the same time, the resulting effect is calleda. a standing wave.b. a Doppler wav

IgorLugansk [536]

Answer: option D

Explanation: The combination of 2 waves to produce a resultant effect at a point is known as interference.

If the waves are in the same direction, the resultant effect is of a larger magnitude, this is called constructive interference which is still a progressive wave.

If the resultant effect brings about cancellation of both waves, we have a destructive interference which forms a standing wave.

6 0

3 years ago

Read 2 more answers

What is the current in milliamperes produced by the solar cells of a pocket calculator through which 4.2 C of charge passes in 2

Leni [432]

Answer:

<h2>0.432mA</h2>

Explanation:

Current produced by the solar cells of the pocket calculator is expressed using the formula I = Q/t where;

Q is the charge (in Columbs)

t is the time (in seconds)

Given parameters

Q = 4.2C

t = 2.7 hrs

t = 2.7*60*60

t = 9720 seconds

Required

Current produced by the solar cell I

Substituting the given values into the formula;

I = 4.2/9720

I = 0.000432A

I = 0.432mA

Hence, the current in milliamperes produced by the solar cells of a pocket calculator is 0.432mA

5 0

3 years ago

The coil has a radius of 8 cm and 110 turns. While moving the magnet closer towards the coil, at a certain point in time, the vo

lianna [129]

Answer:

The magnitude of the rate of change of the flux through the coil is 2.82 x 10⁻³ T.m²/s

Explanation:

Given;

radius of coil, r = 8 cm = 0.08 m

number of turns of the coil, N = 110 turns

the induced emf through the coil, E = -310mV

The induced emf through the coil is given by;

$E = - N\frac{d \phi}{dt} \\\\\frac{d \phi}{dt} = \frac{E}{-N}$

Where;

dФ/dt is the magnitude of the rate of change of the flux through the coil

$\frac{d\phi}{dt} = \frac{-0.31}{110} \\\\\frac{d\phi}{dt} =2.82*10^{-3} \ T.m^2/s$

Therefore, the magnitude of the rate of change of the flux through the coil is 2.82 x 10⁻³ T.m²/s

8 0

3 years ago

A particle’s position is ~r = (ct2 − 2dt3 )iˆ+ (2ct2 − dt2 )jˆ, where c and d are positive constants. Find the expressions for t

Mars2501 [29]

The velocity of the particle is given by the derivative of the position vector:

$\vec v = \dfrac{\mathrm d\vec r}{\mathrm dt} = (2ct-6dt^2)\,\vec\imath + (4ct-2dt)\,\vec\jmath$

(a) The particle is moving in the <em>x</em>-direction when the <em>y</em>-component of velocity is zero:

$4ct-2dt = 2t (2c - d) = 0 \implies t=0$

But we want <em>t</em> > 0, so this never happens, unless 2<em>c</em> = <em>d</em> is given, in which case the <em>y</em>-component is always zero.

(b) Similarly, the particle moves in the <em>y</em>-direction when the <em>x</em>-component vanishes:

$2ct-6dt^2 = 2t (c - 3dt) = 0 \implies t=0 \text{ or }c-3dt = 0$

We drop the zero solution, and we're left with

$c-3dt = 0 \implies c=3dt \implies \boxed{t = \dfrac c{3d}}$

In the case of 2<em>c</em> = d, this times reduces to <em>t</em> = <em>c</em>/(6<em>c</em>) = 1/6.

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3 years ago