All categories

3 years ago

A scientist tests the water in a local pond and finds that it has a pH of 7.9. What is true about the water sample?

Physics

1 answer:

SSSSS [86.1K]3 years ago

3 0

So the pH level of regular water is about 7.0 so since it is 7.9, it means the water is a little more basic

You might be interested in

Two particles with charges of 5.00 μ C and -3.00 μC are placed 0.250 m apart. Where can a third charge be placed so that the net

MAXImum [283]

Answer:

0.86 m

Explanation:

q₁ = magnitude of positive charge = 5 x 10⁻⁶ C

q₂ = magnitude of negative charge = 3 x 10⁻⁶ C

r = distance between the two charges = 0.250 m

d = distance of the location of third charge from negative charge

q = magnitude of charge on third charge

Using equilibrium of electric force on third charge

$\frac{kq_{2}q}{d^{2}} = \frac{kq_{1}q}{(r+d)^{2}}$

$\frac{q_{2}}{d^{2}} = \frac{q_{1}}{(r+d)^{2}}$

$\frac{(5\times 10^{-6})}{(0.250+d)^{2}} = \frac{(3\times 10^{-6})}{(d^{2}}$

d = 0.86 m

4 0

3 years ago

Two children stand on a platform at the top of a curving slide next to a backyard swimming pool. At the same moment the smaller

IgorC [24]

Answer:

Explanation:

i )

In a conservative field like gravitational field , loss of potential energy or work done , depends upon the initial and final point and not the manner in which 2 nd point has been reached . Since the initial and final point is same in both the cases of straight and curved path , final velocity will remain same for both of them .

Hence , due to increased mass of larger child , his kinetic energy will be greater .

ii ) Since the initial and final point is same in both the cases of straight and curved path , final velocity will remain same for both of them .

iii ) Smaller child undergo free fall , therefore , he will fall with acceleration g . The larger child falls on curved path . So , he will have only a component of

vertical g at any moment . hence average acceleration will be less.

6 0

3 years ago

The cause of a fire in a computer is described as an incorrectly wired circuit.

Vikentia [17]

Hey there,

The answer to your question is:

Option A

A) The wiring contained a short circuit, so the reduced resistance caused an increase in current.

- Ari -

8 0

3 years ago

Two identical cylinders, A and B, contain the same type of gas at the same pressure. Cylinder A has twice as much gas as cylinde

cricket20 [7]

Answer:

D. TA < TB

Explanation:

From general gas equation, we know that:

PV = nRT

PV/R = nT

where,

P = pressure of gas

V = volume of gas

R = General gas constant

T = temperature of gas

n = no. of moles of gas

FOR CYLINDER A:

PV/R = (nA)(TA) _____ eqn (1)

FOR CYLINDER B:

PV/R = (nB)(TB) _____ eqn (2)

Because, Pressure, Volume are constant for both cylinders.

Comparing eqn (1) and (2)

(nA)(TA) = (nB)(TB)

It is given that the amount of gas in cylinder A is twice as much as the gas in cylinder B. This means the number moles in cylinder A are twice as much as no. of moles in cylinder B.

nA = 2(nB)

using this in eqn:

2(nB)(TA) = (nB)(TB)

TA = (1/2)(TB)

TA = 0.5 TB

Therefore it is clear that the correct option is:

D. TA<TB

8 0

3 years ago

Which describes how outer space, air, and glass affect the speed of light?

11Alexandr11 [23.1K]

The following that describes how outer space, air, and glass affect the speed of light is that light travels fastest through outer space, it travels somewhat slower though air, and of these three, it travels the slowest through glass. The answer is letter B.

5 0

3 years ago