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3 years ago

Bases can be used for cleaning supplies because they help dissolve grease. True False

Physics

2 answers:

SSSSS [86.1K]3 years ago

6 0

This is true because I had did this befor e

Ainat [17]3 years ago

5 0

Answer:True

Explanation:

Bases can dissolve triglyceride and fatty acid and can dissolve grease.for example Sodium hydroxide is often used in the home for cleaning because bases generally dissolve grease.Thus Grease can be easily dissolved by the use of bases to a large extent.

Thus above statement is true in the context of Greases.

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If 5.4 J of work is needed to stretch a spring from 15 cm to 21 cm and another 9 J is needed to stretch it from 21 cm to 27 cm,

qaws [65]

Answer:

the natural length of the spring is 9 cm

Explanation:

let the natural length of the spring = L

For each of the work done, we set up an integral equation;

$5.4 = \int\limits^{21-l}_{15-l} {kx} \, dx \\\\5.4 = [\frac{1}{2}kx^2 ]^{21-l}_{15-l}\\\\5.4 = \frac{k}{2} [(21-l)^2 - (15-l)^2]\\\\k = \frac{2(5.4)}{(21-l)^2 - (15-l)^2} \ \ \ -----(1)$

The second equation of work done is set up as follows;

$9 = \int\limits^{27-l}_{21-l} {kx} \, dx \\\\9 = [\frac{1}{2}kx^2 ]^{27-l}_{21-l}\\\\9 = \frac{k}{2} [(27-l)^2 - (21-l)^2] \\\\k = \frac{2(9)}{(27-l)^2 - (21-l)^2} \ \ \ -----(2)$

solve equation (1) and equation (2) together;

$\frac{2(9)}{(27-l)^2 - (21-l)^2} = \frac{2(5.4)}{(21-l)^2 - (15-l)^2}\\\\\frac{2(9)}{2(5.4)} = \frac{(27-l)^2 - (21-l)^2}{(21-l)^2 - (15-l)^2}\\\\\frac{9}{5.4} = \frac{(729 - 54l+ l^2) - (441-42l+ l^2)}{(441-42l+ l^2) - (225 -30l+ l^2)} \\\\\frac{9}{5.4 } = \frac{288-12l}{216-12l} \\\\\frac{9}{5.4 } =\frac{12}{12} (\frac{24-l}{18 -l})\\\\\frac{9}{5.4 } = \frac{24-l}{18 -l}\\\\9(18-l) = 5.4(24-l)\\\\162-9l = 129.6-5.4l\\\\162-129.6 = 9l - 5.4 l\\\\32.4 = 3.6 l\\\\l = \frac{32.4}{3.6} \\\\$

$l = 9 \ cm$

Therefore, the natural length of the spring is 9 cm

4 0

3 years ago

Coulomb’s Law describes:a.Electric force exerted on one charged sphere, by another charged sphere.b.Magnetic field surrounding a

Leni [432]

Answer:

a.Electric force exerted on one charged sphere, by another charged sphere.

Explanation:

Coulomb's Law describes the electric force between two objects. It is given by the following formula:

$\vec{F} = \frac{1}{4\pi\epsilon_0}\frac{q_1q_2}{r^2}\^r$

The magnetic field surrounding a current carrying conductor is described by Ampere's Law.

Amount of heat generated by a high current flow in a resistor can be described by P = VI

Voltage induced in a coil by a constant magnetic field is described by Faraday's Law.

7 0

3 years ago

What does grit mean in psychology

andrew11 [14]

Answer:

The meaning of grit in psychology is a positive, non-cognitive trait based on an individual's perseverance of effort combined with the passion for a particular long-term goal or end state.

8 0

3 years ago

A 3 kg bowling ball is thrown onto a mattress. If it takes 0.3 seconds to stop the ball using a force of 24 N, what was the init

Lubov Fominskaja [6]

Answer:

2.4 m/s

Explanation:

Applying Newton's second law of motion,

F = m(v-u)/t.............. Equation 1

Where F = force exerted on the ball, m = mass of the ball, v = final velocity of the ball, u = initial velocity of the ball, t = time required to stop the ball.

Note: Since the the ball come to stop, then v = 0 m/s.

F = -mu/t............. Equation 2

make u the subject of the equation

u = -Ft/m............. Equation 3

Given: m = 3 kg, t = 0.3 s, F = 24 N

Substitute into equation 3

u = -(24×0.3)/3

u = -2.4 m/s.

Note the negative sign tells that the initial velocity of the ball is in opposite direction to the force acting on the ball.

6 0

4 years ago

5. A family leaves for an evening walk around the neighborhood. They leave at 5 pm and return at 6 pm. They traveled a total of

vlabodo [156]

This question involves the concepts of average speed, distance, and time.

The average speed of the family is "2.5 mi/hr".

<h3>AVERAGE SPEED</h3>

The average speed is defined as the ratio of the total distance covered with the total time taken to cover it.

$v=\frac{s}{t}$

where,

s = distance covered = 2.5 miles
t = total time taken = 1 hour
v = average speed = ?

Therefore,

$v=\frac{2.5\ mi}{1\ hr}$

v = 2.5 mi/hr

Learn more about average speed here:

brainly.com/question/12322912

4 0

3 years ago