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3 years ago

Disordered eating is often __________.

Physics

2 answers:

Amiraneli [1.4K]3 years ago

6 0

Answer:

I think is B

Explanation:

Letter A is only for teens, but adults or kids also can have a eating disorder.

Oksanka [162]3 years ago

4 0

Answer:

B) caused by eating irregularly over short periods

Explanation:

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A system dissipates 12 J of heat into the surroundings; meanwhile, 28 J of work is done on the system. What is the change of the

timurjin [86]

Answer:

option C

Explanation:

given,

energy dissipated by the system to the surrounding = 12 J

Work done on the system = 28 J

change in internal energy of the system

Δ U = Q - W

system losses energy = - 12 J

work done = -28 J

Δ U = Q - W

Δ U = -12 -(-28)

Δ U = 16 J

hence, the correct answer is option C

6 0

3 years ago

A 0.23 kg mass at the end of a spring oscillates 2.0 times per second with an amplitude of 0.15 m

charle [14.2K]

Answer:

A) v = 1.885 m/s

B) v = 0.39 m/s

C) E = 0.03 J

D) $x(t) = (0.15m)\cos(2\pi (2.0Hz)t)$

Explanation:

Part A

We will use the conservation of energy to find the speed at equilibrium.

$K_{eq} + U_{eq} = K_A + U_A\\\frac{1}{2}mv^2 + 0 = 0 + \frac{1}{2}kA^2\\v = \sqrt{\frac{k}{m}}A$

where $\omega = \sqrt{k/m}$ and $\omega = 2\pi f$

Therefore,

$v = 2\pi f A = 2(3.14)(2)(0.15) = 1.885~m/s$

Part B

The conservation of energy will be used again.

$K_1 + U_1 = K_2 + U_2\\\frac{1}{2}mv^2 + \frac{1}{2}kx^2 = \frac{1}{2}kA^2\\mv^2 + kx^2 = kA^2\\(0.23)v^2 + k(0.10)^2 = k(0.15)^2\\v^2 = \frac{k(0.15)^2-(0.10)^2}{0.23}\\v = \sqrt{0.054k}$

where $k = \omega^2 m = (2\pi f)^2 m = 2(3.14)(2)(0.23) = 2.89$

Therefore, v = 0.39 m/s.

Part C

Total energy of the system is equal to the potential energy at amplitude.

$E = \frac{1}{2}kA^2 = \frac{1}{2}(2.89)(0.15)^2 = 0.03~J$

Part D

The general equation of motion in simple harmonic motion is

$x(t) = A\cos(\omega t + \phi)\\x(t) = (0.15m)\cos(2\pi (2.0Hz)t + \phi)$

where $\phi$ is the phase angle to be determined by the initial conditions. In this case, the initial condition is that at t = 0, x is maximum. Therefore,

$x(t) = (0.15m)\cos(2\pi (2.0Hz)t)$

5 0

4 years ago

A mass with mass 4 is attached to a spring with spring constant 24 and a dashpot giving a damping 20. The mass is set in motion

aleksandrvk [35]

Answer: $x(t) = 14e^{-2t} - 10e^{-3t}$

Explanation: In a mass-spring-damper system, the differential equation that rules the motion of the mass is: mx" + cx' + kx = 0

Using m = 4, k = 24 and c = 20, we have

4x" + 20x' + 24x = 0

Simplifying, we have

x" + 5x'+ 6x = 0

The characteristic equation of this differential is

$r^{2} + 5r + 6 = 0$

The solutions for the quadratic equation are: $r_{1} = -2$ and $r_{2} = -3$

Hence:

x(t) = $C_{1}e^{-2t} + C_{2}e^{-3t}$

x'(t) = $-2C_{1}E^{-2t} - 3C_{2}e^{-3t}$

To determine the constants, we have the initial conditions x(0) = 4 and

x'(0) = 2, then:

$x(0) = C_{1} + C_{2} = 4\\ C_{1} = 4 - C_{2}$

$x'(0) = -2C_{1} -3C_{2} = 2\\-2(4-C_{2}) -3C_{2} = 2\\C_{2} = -10\\C_{1} = 4 - C_{2}\\C_{1} = 14$

Substituing the constants:

$x(t) = 14e^{-2t} - 10e^{-3t}$

The position function for this system is: $x(t) = 14e^{-2t} - 10e^{-3t}$

7 0

3 years ago

Some elements are more reactive than other elements why do you think this is

EastWind [94]

Answer:

Different elements all have different amounts of electrons in there outter shell.

Explanation

If you look at a periodic table, the elements are all listed in "Groups" up at the top you'll see the numbers, or columns. Each column's number represent how many electrons there are in each particular element.

hope this makes sense....

8 0

3 years ago

Please answer 6 someone

Vlad [161]

Aggregat 4, Aggregat 4, Aggregat 4, Aggregat 4,

8 0

4 years ago