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3 years ago

Use the law of conservation of mass to explain why a chemical equation must be balanced

1 answer:

7 0

The chemical equation needs to be balanced so that it follows the law of conservation of mass. A balanced chemical equation occurs when the number of the different atoms of elements in the reactants side is equal to that of the products side. Balancing chemical equations is a process of trial and error.

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3. A 10m light beam is supported at the ends A and B. The weight of 40000N is placed at 4m from A.

tino4ka555 [31]

Answer:

hdhdhjejrojrjdjjdjdjjdid

Explanation:

rbhrnrndnnejejjr

4 0

3 years ago

describe how light reflecting from a mirror can produce an image. In particular, explain how mirrors can produce images that are

VikaD [51]

Answer:

A larger image is produced when $d_i$ > $d_o$

A smaller image is produced when $d_i$ < $d_o$

An upright image is produced when m is positive

An upright image is produced when m is negative

Explanation:

The mirror equation is given as follows;

$\dfrac{1}{f} = \dfrac{1}{d_i} + \dfrac{1}{d_o}$

$m =-\dfrac{d_i}{d_o} = \dfrac{h_i}{h_o}$

For concave mirrors, f = focal length

$d_i$ = Image distance from the mirror (-ve $d_i$ = Image is behind the mirror +ve $d_i$ = Image is in front of the mirror)

$d_o$ = Object distance from the mirror (-ve $d_o$ = Object is behind the mirror +ve $d_o$ = Object is in front of the mirror)

m = Magnification (-ve m = Inverted image +ve m = upright image)

$h_i$ = Image height

$h_o$ = Object height

f = Focal length of the mirror

To produce a larger image $d_i$ > $d_o$

To produce a smaller image $d_i$ < $d_o$

To produce an upright image, m should be positive hence, $d_i$ will be negative or the image will appear behind the mirror

To produce an inverted image, m should be negative hence, $d_i$ will be positive or the image will form in front of the mirror.

5 0

3 years ago

A solid uniform sphere and a thin-walled, hollow sphere have the same mass M and radius R. If they roll without slipping up a ra

elixir [45]

Answer:Hollow sphere

Explanation:

Given

same mass for solid and hollow sphere

same $v_{cm}$ before they start up incline

Moment of inertia of solid Sphere

$I_1=\frac{2}{5}Mr^2$

Moment of inertia of hollow sphere

$I_2=\frac{2}{3}Mr^2$

Conserving Energy at bottom and top point for solid sphere

kinetic energy +Rotational Energy=Potential energy

$\frac{1}{2}Mv_{cm}^2+\frac{1}{2}I\omega ^2=mgh_1$

for pure rolling $v_{cm}=\omega r$

$\frac{1}{2}Mv_{cm}^2+\frac{1}{2}\times \frac{2}{5}Mr^2=Mgh_1$

$\frac{7}{10}Mv_{cm}^2=Mgh_1$

$h_1=\frac{7v_{cm}^2}{10g}$

For hollow sphere

$\frac{1}{2}Mv_{cm}^2+\frac{1}{2}\times \frac{2}{3}Mr^2=Mgh_2$

$h_2=\frac{5v_{cm}^2}{6g}$

therefore height gained by hollow sphere is more

6 0

4 years ago

Which of the following treatments would enhance the level of the Pfr form of phytochrome?A) exposure to far-red lightB) exposure

puteri [66]

Answer:

B) exposure to red light

Explanation:

Plants use a phytochrome system to sense the level, intensity, duration, and color of environmental light do as to adjust their physiology.

The phytochromes are a family of chromoproteins with a linear tetrapyrrole chromophore, similar to the chlorophyll. Phytochromes have two photo-interconvertible forms: Pr and Pfr. Pr absorbs red light (~667 nm) and is immediately converted to Pfr. Pfr absorbs far-red light (~730 nm) and is quickly converted back to Pr. Absorption of red or far-red light causes a massive change to the shape of the chromophore, altering the conformation and activity of the phytochrome protein to which it is bound. Together, the two forms represent the phytochrome system.

4 0

4 years ago

A magnetic field protects earth from the sun’s high-energy particles. What two processes are involved in the formation of earth’

Tomtit [17]

Answer:

The movement of electricity-conducting iron from the convection currents and the spinning of the earth induces a current which induces a magnetic field.

Explanation:

ur welcome

8 0

3 years ago