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GaryK [48]
3 years ago
12

Nanotechnology is proving ineffective at helping clean up PCB’s. True orFalse

Physics
2 answers:
tester [92]3 years ago
8 0
False, <span>Nanotechnology is proving effective at helping clean up PCB’s.</span>
Eddi Din [679]3 years ago
7 0
It is FALSE just took the test on ed,genuity
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Show that liquid pressure is directly<br>proportional to height of liquid in a vessel.​
Norma-Jean [14]

Answer:

P=F/A where F is the weight of the water and A is the area on which it is resting. The weight of the water is mg. The mass of the water is dv where d is the density and v is the volume. Finally, the volume of the water in a vessel is equal to the area of the base of the vessel times the height of the vessel. (v=Ah)

Plugging everything in we get:

P = dAhg/A

So

P=dhg

So we have shown that liquid pressure is directly  proportional to height of liquid in a vessel.​

7 0
3 years ago
An AC generator supplies 230 V peak voltage at 210 Hz frequency. How much power is dissipated in a resistor with R = 225 Ω resis
sesenic [268]

Answer:

The power dissipated in a resistor is 117.54 watts.

Explanation:

Given that,

Peak voltage of the Ac generator, V = 230 V

Frequency, f = 210 Hz

Resistance, R = 225 ohms

We need to find the power dissipated in a resistor. The power generated is given by :

P=\dfrac{V^2_{rms}}{R}

V_{rms}=\dfrac{V}{\sqrt{2} }\\\\V_{rms}=\dfrac{230}{\sqrt{2} } \\\\V_{rms}=162.63\ V

So,

P=\dfrac{162.63^2}{225}\\\\P=117.54\ W

So, the power dissipated in a resistor is 117.54 watts. Hence, this is the required solution.

7 0
4 years ago
What is the energy required to raise the temperature of 1 g of a substance by 1°c or 1 k?
lesya692 [45]

Answer:

Specific heat

Explanation:

The specific heat is the amount of heat, that is energy in transfer to or from a thermodynamic system, required to raise the temperature of 1 g of substance by one degree Celsius or one Kelvin, since one degree on the Celsius scale is equal to one Kelvin.

7 0
3 years ago
Joules constant, 4.1868 J/cal, is an equivalence relation for 4.1868 Joules of work for 1 calorie of heat delivered to a substan
Llana [10]

Answer:

The final answer is 6.1 BTU = 6.5621*103 KJ

Explanation:

1 BTU= 252 cal\\1 BTU =252 × 4.2 kJ\\6.1 BTU = 252 × 6.1×4.2 kJ                = 6562.08 kJ\\                = 6.5621 × 103 kJ\\

Hence, 6.1 BTU = 6.5621 × 103 kJ

7 0
3 years ago
A pendulum of mass 5.0 ???????? hangs in equilibrium. A frustrated student walks up to it and kicks the bob with a horizontal fo
Rudiy27

Answer:

a. 37.75°

b. 6.21 m

Explanation:

a. The horizontal force acting on a pendulum bob is given as:

F = mgsinθ

where m = mass of bob

g = acceleration due to gravity

θ = angle string makes with the vertical or angle of displacement

Making θ subject of formula, we have:

θ = sin^{-1}(\frac{F}{mg} )

θ = sin^{-1} (\frac{30}{5*9.8})

θ = 37.75°

The maximum angle of displacement is 37.75°

b. Period of a pendulum is given as:

T = 2\pi\sqrt{ \frac{L}{g} }

where L = length of string

Therefore, making L subject of formula:

L = \frac{gT^2}{4\pi^2}

L = \frac{9.8 * 5^2}{4\pi^2} \\\\\\L = 6.21 m

The string holding the pendulum has to be 6.21 m long.

4 0
3 years ago
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