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2 years ago

Which substance, when mixed with water, will produce the best conductor of electricity?.

Physics

1 answer:

mario62 [17]2 years ago

3 0

Answer:

Table Salt

Explanation:

Table Salt has free ions in water that conduct electricity so when mixed with water produces the best conductance of electricity

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Which of the following is NOT a step in the technical design<br> process?

dalvyx [7]

Answer:

incurriculum design process the answer is designs

4 0

3 years ago

PLEASE HELP!!!!!

Arte-miy333 [17]

Answer:

it states that energy can either be gained or lost but it only changes its form.

Explanation:

for example:as a ball is still on the table it posses a potential energy of 100j and a k.e of 0j,as it falls it gains k.e so the midpoint the p.e is equal to the k.e (50j equally) as it approches the ground it completely gains k.e (100j) and the p.e is 0j.

total energy is 100j so it has been converted from p.e to k.e.

hope u have understood.

5 0

3 years ago

A tank of water is in the shape of a cone (assume the ""point"" of the cone is pointing downwards) and is leaking water at a rat

Inessa05 [86]

Answer:

a) dh/dt = -44.56*10⁻⁴ cm/s

b) dr/dt = -17.82*10⁻⁴ cm/s

Explanation:

Given:

Q = dV/dt = -35 cm³/s

R = 1.00 m

H = 2.50 m

if h = 125 cm

a) dh/dt = ?

b) dr/dt = ?

We know that

V = π*r²*h/3

and

tan ∅ = H/R = 2.5m / 1m = 2.5 ⇒ h/r = 2.5

⇒ h = (5/2)*r

⇒ r = (2/5)*h

If we apply

Q = dV/dt = -35 = d(π*r²*h/3)*dt

⇒ d(r²*h)/dt = 3*35/π = 105/π ⇒ d(r²*h)/dt = -105/π

a) if r = (2/5)*h

⇒ d(r²*h)/dt = d(((2/5)*h)²*h)/dt = (4/25)*d(h³)/dt = -105/π

⇒ (4/25)(3*h²)(dh/dt) = -105/π

⇒ dh/dt = -875/(4π*h²)

b) if h = (5/2)*r

Q = dV/dt = -35 = d(π*r²*h/3)*dt

⇒ d(r²*h)/dt = d(r²*(5/2)*r)/dt = (5/2)*d(r³)/dt = -105/π

⇒ (5/2)*(3*r²)(dr/dt) = -105/π

⇒ dr/dt = -14/(π*r²)

Now, using h = 125 cm

dh/dt = -875/(4π*h²) = -875/(4π*(125)²)

⇒ dh/dt = -44.56*10⁻⁴ cm/s

then

h = 125 cm ⇒ r = (2/5)*h = (2/5)*(125 cm)

⇒ r = 50 cm

⇒ dr/dt = -14/(π*r²) = - 14/(π*(50)²)

⇒ dr/dt = -17.82*10⁻⁴ cm/s

4 0

3 years ago

A 200 g, 20 cm diameter plastic disk is spun on an axle through its center by an electric motor. What torque must the motor supp

Rama09 [41]

Answer: The torque required is 0.0471 N m.

Explanation:

Mass of the disc = 200 g = 0.2 kg (1 kg =1000 g)

Radius of the disc = $\frac{Diameter}{2}$ = 10 cm = 0.1 m(1 m = 100 cm)

Angular acceleration = $\alpha$

$\alpha =\frac{2\pi\times 1800}{60 \times 4 sec}=15\pi rad/s^2$

Moment of inertia = $\frac{1}{2}\times mass\times (radius)^2=\frac{1}{2}\times0.2 kg\times (0.1 m)^2=0.001 kg m^2$

$Torque=\alpha \times I=0.001 kg m^2\times 15\times 3.14 rad/s^2r=0.0471 N m$

The torque required is 0.0471 N m.

7 0

4 years ago

A beam of light strikes a sheet of glass at an angle of 56.6° with the normal in air. You observe that red light makes an angle

Yuri [45]

Answer:

(a). Index of refraction are $n_{red}$ = 1.344 & $n_{violet}$ = 1.406

(b). The velocity of red light in the glass $v_{red} =$ 2.23 × $10^{8} \ \frac{m}{s}$

The velocity of violet light in the glass $v_{violet} =$ 2.13 × $10^{8} \ \frac{m}{s}$

Explanation:

We know that

Law of reflection is

$n_1 \sin\theta_{1} = n_2 \sin\theta_{2}$

Here

$\theta_1$ = angle of incidence

$\theta_2$ = angle of refraction

(a). For red light

1 × $\sin 56.6$ = $n_{red}$ × $\sin 38.4$

$n_{red}$ = 1.344

For violet light

1 × $\sin 56.6$ = $n_{violet}$ × $\sin 36.4$

$n_{violet}$ = 1.406

(b). Index of refraction is given by

$n = \frac{c}{v}$

$n_{red}$ = 1.344

$v_{red} = \frac{c}{n_{red} }$

$v_{red} = \frac{3(10^{8} )}{1.344}$

$v_{red} =$ 2.23 × $10^{8} \ \frac{m}{s}$

This is the velocity of red light in the glass.

The velocity of violet light in the glass is given by

$v_{violet} = \frac{3(10^{8} )}{1.406}$

$v_{violet} =$ 2.13 × $10^{8} \ \frac{m}{s}$

This is the velocity of violet light in the glass.

8 0

3 years ago