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4 years ago

Determining the pH of substances such as purple grape juice and catsup using test strips can be difficult. Why?

Physics

1 answer:

Charra [1.4K]4 years ago

4 0

Answer:

Because they would naturally dye the test strips in the colors violet and red, regardless of their pH values

(would really appreciate the brainliest)

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a crowbar having the lenght of 1.75 is used to balance a load of 500N if the distance between the fulcrum and the load is 0.5m f

goblinko [34]

The effort applied : 200 N

<h3>Further explanation</h3>

Equilibrium rotation

$\large {\boxed {\bold {\sum \tau = 0}}$

F₁.d₁-F₂.d₂=0

F₁.d₁=F₂.d₂

F₁=500 N

d₁=0.5 m

d₂=1.75-0.5=1.25 m

$\tt 500\times 0.5=F_2\times 1.25\\\\F_2=\dfrac{500\times 0.5}{1.25}=200~N$

5 0

3 years ago

A 76g ball is attached to a string that is 1.5m long. It is spun so that it completes two full rotations every second. What is t

Marat540 [252]

The centripetal acceleration = 236.63 m/s²

The force = 17.98 N

<h3>Further explanation</h3>

Given

mass = 76 g = 0.076 kg

r = 1.5 m

f = 2 rps = 2 rotation per second

Required

The centripetal acceleration

The Force tension

Solution

Centripetal force is a force acting on objects that move in a circle in the direction toward the center of the circle

$\large {\boxed {\bold {F = \frac {mv ^ 2} {R}}}$

F = centripetal force, N

m = mass, Kg

v = linear velocity, m / s

r = radius, m

The speed that is in the direction of the circle is called linear velocity

Can be formulated:

$\tt \displaysyle v = 2 \pi.r.f$

r = circle radius

f = rotation per second (RPS)

The linear velocity : 2 x 3.14 x 1.5 x 2 =18.84 m/s

The centripetal acceleration : ac = v²/R = 236.63 m/s²

The force : F = m x ac = 0.076 x 236.63 = 17.98 N

4 0

3 years ago

Have you ever gone to a restaurant and ordered a glass of water with a straw in it? When you look at the glass, the straw seems

Sloan [31]

It’s because of refraction! the light bends at an angle and makes the straw look bent/broken. it’s just the way the light hits the glass that makes the straw look like that

4 0

3 years ago

Read 2 more answers

Protons in an accelerator at the Fermi National Laboratory near chicago are accelerated to a total energy that is 400 times thei

Thepotemich [5.8K]

(a) 0.99999687c

The relationship between total energy (E) and rest energy ( $E_0$ ) is

$E=\gamma E_0$

where $\gamma$ is the relativistic factor. In this problem, we know that the total energy is 400 times the rest energy: this means that

$\gamma=400$

The formula for the relativistic factor is

$\gamma=\frac{1}{\sqrt{1-\frac{v^2}{c^2}}}$

where v is the speed of the proton and c is the speed of light. By isolating the term v/c, we find the speed of the protons in terms of c:

$1-(\frac{v}{c})^2=\frac{1}{\gamma^2}\\\frac{v}{c}=\sqrt{1-\frac{1}{\gamma^2}}=\sqrt{1-\frac{1}{400^2}}=0.99999687$

(b) $3.75\cdot 10^5 MeV$

Given the rest mass of a proton:

$m_0=1.67\cdot 10^{-27}kg$

its rest energy is the energy equivalent to this mass:

$E_0=m_0 c^2 = (1.67\cdot 10^{-27}kg)(3\cdot 10^8 m/s)^2=1.5\cdot 10^{-10} J$

The protons in the Fermi Laboratory have energy that is 400 times their rest energy, so their total energy is

$E=400 E_0$

The total energy is also sum of rest energy and kinetic energy:

$E=E_0+K$

So the kinetic energy is

$K=E-E_0=400E_0 - E_0 = 399 E_0 = 399(1.5\cdot 10^{-10}J)=6.0\cdot 10^{-8} J$

And since the conversion factor is

$1 eV = 1.6\cdot 10^{-19} J$

This kinetic energy converted into MeV ( $10^6 eV$ ) is

$K=\frac{6.0\cdot 10^{-8}J}{1.6\cdot 10^{-19}J/eV \cdot 10^6 eV/MeV}=3.75\cdot 10^5 MeV$

5 0

3 years ago

Compared to energy-flow in ecosystems, the flow of matter ________.

disa [49]

Compared to energy-flow in ecosystems, the flow of matter <span>reflects conservation and recycling.
For example, let's take a look at the food chain system. Every time an organism is consumed by another organism, the energy that is given to the eater is only about 10% of the total existing energy
</span>

3 0

3 years ago