Balance this chemical equation.

Hlint: Balance Al last and then use a multiple of 2 and 3.
Al + HCl —> AICI3 + H2

Photographic paper reacts to light to produce the image taken by a camera and stored on film. Darkrooms used red lighting to allow photographers to control light carefully, so that light-sensitive photographic paper would not become overexposed and ruin the pictures during the developing process.

Answer:

Photographic paper reacts to light to produce the image taken by a camera and stored on film.

Explanation:

Darkrooms used red lighting to allow photographers to control light carefully so that light-sensitive photographic paper would not become overexposed and ruin the pictures during the developing process.

Answer:

the answer is a 304.6m/s

Explanation:

1,523 / 5 equals 304.6

Answer:

This is false

Explanation:

This is why the answer to this question is false. If these types of objects (2 points connected) should pass through same sets of 3 points, irrespective of the order that each object was plotted, we will not get identical shapes created.

The shape that is going to be created will be dependent on the pattern/order that was involved in the plotting. If it was identical, then we will have identical shapes. But if the order during plotting is different then we will have different shapes created.

Thank you!

Answer:

D-Energy

Explanation:

Answer:  b. inertia

According to Newton's First Law of Motion, if an object is at rest, then it stays at rest as long as no external forces are applied to get the object moving. If an object is in motion, then it stays in motion (again as long as no external forces are applied to say otherwise). This is known as inertia.

For example, if you were to launch a baseball into deep space (far from any planet), then the ball will travel in a straight line at a constant speed until it either hits another object to have it slow down, or another planet's gravity starts to pull on the ball.

Answer:

The voltage drop across the bulb is 115 V

Explanation:

The voltage drop equation is given by:

[tex]V=\frac{\Delta W}{\Delta q}[/tex]

Where:

ΔW is the total work done (4.6kJ)

Δq is the total charge

We need to use the definition of electric current to find Δq

[tex]I=\frac{\Delta q}{\Delta t}[/tex]

Where:

I is the current (2 A)

Δt is the time (20 s)

[tex]2=\frac{\Delta q}{20}[/tex]

[tex]q=40 C[/tex]

Then, we can put this value of charge in the voltage equation.

[tex]V=\frac{4600}{40}=115 V[/tex]

Therefore, the voltage drop across the bulb is 115 V.

I hope it helps you!

Answer:

0kgm/s

Explanation:

Given parameters:

Mass of the passenger  = 48.5kg

Unknown:

Momentum  = ?

Solution:

The momentum of a body is the quantity of motion a body possesses. A body not in motion has no momentum.

Mathematically;

  Momentum = mass x velocity

  So;

Since the train is stopped, velocity  = 0m/s

        Momentum  = 48.5 x 0 = 0kgm/s

Answer:

[tex]c=71.4m/s[/tex]

[tex]\theta=8.54\textdegree[/tex]

Explanation:

From the question we are told that

Initial velocity of 60 m/s

Wind speed [tex]V_w= 15 m/s \angle 45 \textdegree[/tex]

Generally Resolving vector mathematically

  [tex]sin(45\textdegree)15=10.6\\cos(45\textdegree)15=10.6[/tex]

Generally the equation Pythagoras theorem is given mathematically by

[tex]c^2=a^2+b^2[/tex]

[tex]c^2=10.6^2 +(10.6+60)^2[/tex]

[tex]c=\sqrt{10.6^2 +(10.6+60)^2}[/tex]

Therefore Resultant velocity (m/s)

[tex]c=71.4m/s[/tex]

b)Resultant direction

Generally the equation for solving Resultant direction

[tex]\theta=tan^-1(\frac{y}{x})[/tex]

Therefore

[tex]\theta=tan^-1(\frac{10.6}{70.6})[/tex]

[tex]\theta=8.54\textdegree[/tex]

Answer:

[tex]F=-88Ib[/tex]

Explanation:

From the question we are told that:

Force P=88Ib

Mass of crate M_c=210Ib

Generally the equation for Frictional force F is mathematically given by

[tex]Friction\ force (f) = friction\ coefficient\ (u) * Normal\ reaction (N)[/tex]

[tex]F=u*N[/tex]

with [tex]\mu =0.47[/tex]

[tex]F=98.7Ib[/tex]

Therefore since Static Friction supersedes applied force body remains at rest.

Frictional force =88Ib (negative)

[tex]F=-88Ib[/tex]

Answer:

YOU CAN SNEEZE YOUR WAY TO A RIB FRACTURE.

Explanation:

This question is in two parts. This is not the correct multiple choice options for this part a.

The second part had the option

b)If your bedroom has a circular shape, and its diameter measured 6.32 , which of the following numbers would be the most precise value for its area?

a)30 m^2

b) 31.4 m^2

c)31.37 m^2

d)31.371 m^2

Answer:

A. 17.0 m²

B. 31.4 m²

Explanation:

The formula for the calculation of the area of a rectangle is given as

Area = length x width

The length = 3.547 m

The width = 4.79 m

Then area = 3.547 x 4.79

= 16.990m²

When approximated = 17.0m²

This is the most precise measurement for the area of the bedroom.

B.

We solve b using this formula

Area = pi(diameter/2)^2

= 3.14(6.32/2)²

= 3.14 x 9.9856

= 31.4 m²

Answer:

a) The change in potential energy of a 3.0 kilograms backpack carried up the stairs.

b) The change in potential energy of a persona with weight 650 newtons that descends the stairs is -2665 joules.

Explanation:

Let consider the bottom of the first floor in a building as the zero reference ([tex]z = 0\,m[/tex]). The change in potential energy experimented by a particle ([tex]\Delta U_{g}[/tex]), measured in joules, is:

[tex]\Delta U_{g} = m\cdot g\cdot (z_{f}-z_{o})[/tex] (1)

Where:

[tex]m[/tex] - Mass, measured in kilograms.

[tex]g[/tex] - Gravitational acceleration, measured in meters per square second.

[tex]z_{o}[/tex], [tex]z_{f}[/tex] - Initial and final height with respect to zero reference, measured in meters.

Please notice that [tex]m\cdot g[/tex] is the weight of the particle, measured in newtons.

a) If we know that [tex]m = 3\,kg[/tex], [tex]g = 9.807\,\frac{m}{s^{2}}[/tex], [tex]z_{o} = 0\,m[/tex] and [tex]z_{f} = 4.1\,m[/tex], then the change in potential energy is:

[tex]\Delta U_{g} = (3\,kg)\cdot \left(9.807\,\frac{m}{s^{2}} \right)\cdot (4.1\,m-0\,m)[/tex]

[tex]\Delta U_{g} = 120.626\,J[/tex]

The change in potential energy of a 3.0 kilograms backpack carried up the stairs.

b) If we know that [tex]m\cdot g = 650\,N[/tex], [tex]z_{o} = 4.1\,m[/tex] and [tex]z_{f} = 0\,m[/tex], then the change in potential energy is:

[tex]\Delta U_{g} = (650\,N)\cdot (0\,m-4.1\,m)[/tex]

[tex]\Delta U_{g} = -2665\,J[/tex]

The change in potential energy of a persona with weight 650 newtons that descends the stairs is -2665 joules.

Answer:

4.38 km

Explanation:

Volume of oil slick, V = Area of oil slick, A × thickness of 1 molecule, d'

Since the oil slick spreads out in a circular area, it has the area of a circle.

So, V = πd²/4 × d'

d² = 4V/πd'

d = 2√(V/πd') where d = diameter of oil slick.

Since V = 3000 cm³ = 3000 × 10⁻⁶ m³ = 3 × 10⁻³ m³ and d' = 2 × 10⁻¹⁰ m

So, d = 2√(3 × 10⁻³ m³/(π × 2 × 10⁻¹⁰ m))

= 2√(3 × 10⁻³ m³/(6.283 × 10⁻¹⁰ m))

= 2√(0.477 × 10⁷ m²) = 2√(4.775 × 10⁶ m²)

=  2 × 2.19 × 10³ m

= 4.38 × 10³ m

= 4.38 km

Answer:

As r decreases, we lose gravitational potential energy - in other words, U G U_G UG​U, start subscript, G, end subscript becomes more negative. Because energy is conserved, the velocity must increase, resulting in an increase in kinetic energy.

Explanation:

Answer:

585lb

Explanation:

Given the formula for calculating the magnitude of the resultant force as;

[tex]F_R = F_1 + F_2[/tex]

Given

[tex]F_1 = 235 lb \ and \ F_2 = 350 lb\\F_R = 235lb + 350lb\\F_R = 585lb\\[/tex]

Hence the magnitude of the resultant force is 585lb

Answer:

Explanation:

Answer:

Speed of water at the top of fall = 5.40 m/s

Explanation:

We have equation of motion

Here final velocity, v = 26 m/s

a = acceleration due to gravity

displacement, s = 33 m

Substituting

Speed of water at the top of fall = 5.40 m/s

Answer:

Explanation:

Firstly, we have to define momentum.

Momentum is define as the product of mass and velocity.

That is P = mass×velocity

Also considering the third law of motion which states that: For every action, there is equal and opposite reaction.

Moreso, considering the 2nd law of motion which states that the rate of change in the momentum of a body is equal to the applied force and takes place in the direction of the applied force.

Now, applying P = mass×velocity

They both have same mass and velocity definitely, they will both experience same momentum.

Also from the question, the both share same velocity hence, the will both hit the wall with same velocity meaning the will both feel the same impact from the wall as well. Hence the third law of motion proves this right.

Answer:

a) we bring the rod closer to one of the spheres connected to Earth,  

   we disconnect the ground cable and move the rod away and join the two spheres with the wire

b) we connect a sphere to ground,  bring the rod closer

   we disconnect the ground cable

   Now we bring the rod closer to the other isolated sphere

Explanation:

In this interesting exercise we will use that electric charges are of two types positive and negative, where charges of the same sign repel and of opposite sign attract.

In metals the charges are mobile and can be displaced, we will conspire the earth as a receptor of charges and the glass rod does not have mobile charges, but it does have charges created by friction with silk.

With these concepts let's analyze the requested situations

a) How to create charge of equal magnitude and same sign in the spheres.

To create this situation we bring the rod closer to one of the spheres connected to Earth with the wire, in this case the charge induced by the sphere stops to the ground, then we disconnect the ground cable and move the rod away, therefore the sphere that with a charge of equal magnitude of the rod but of opposite sign.

Now we join the two spheres with the wire and the charge is distributed between the two, we remove the wire and each sphere with a charge equal to the mistad of the cheek and of the opposite sign.

Therefore the two spheres have a charge of equal magnitude and sign.

b) how to create charge of equal magnitude and opposite signs.

For this case we connect a sphere to ground with the wire, we bring the rod closer and an induced charge is created on the sphere of equal magnitude to the rod charge and of opposite sign, an equal charge and of the same sign as the rod passes to ground through the wire, disconnect the wire and remove the rod. The sphere with a charge equal to that of the rod and with the opposite sign.  

Now we bring the rod closer to the other isolated sphere, an induced charge of opposite sign to the rod and of the same magnitude is created,

in this case we keep the rod in this position and we have two charges of equal magnitude, but without opposite in each sphere

Answer:

The sound travelled 516 meters before bouncing off a cliff.

Explanation:

The sound is an example of mechanical wave, which means that it needs a medium to propagate itself at constant speed. The time needed to hear the echo is equal to twice the height of the canyon divided by the velocity of sound. In addition, the speed of sound through the air at a temperature of 20 ºC is approximately 344 meters per second. Then, the height of the canyon can be derived from the following kinematic formula:

[tex]2\cdot h = v\cdot t[/tex] (1)

Where:

[tex]h[/tex] - Height, measured in meters.

[tex]v[/tex] - Velocity of sound, measured in meters per second.

[tex]t[/tex] - Time, measured in seconds.

If we know that  [tex]v = 344\,\frac{m}{s}[/tex] and [tex]t = 3\,s[/tex], then the height of the canyon is:

[tex]h = \frac{v\cdot t}{2}[/tex]

[tex]h = \frac{\left(344\,\frac{m}{s} \right)\cdot (3\,s)}{2}[/tex]

[tex]h = 516\,m[/tex]

The sound travelled 516 meters before bouncing off a cliff.

Answer:

She takes pictures and analyzes DNA samples

Answer:

Force = -1161.6 Newton

Explanation:

Given the following data;

Initial velocity, u = 44m/s

Distance ,s = 12.5cm to m = 12.5/100 = 0.125m

Mass = 0.15kg

To find the acceleration;

We would use the third equation of motion;

V ² = U² + 2as

0² = 44² + 2*a*0.125

0 = 1936 + 0.25a

0.25a = -1936

a = -1936/0.25

Acceleration, a = -7744m/s2

Force = mass * acceleration

Substituting into the equation, we have;

Force = 0.15 * (-7744)

Force = -1161.6 Newton

The value of its force is negative because the glove decreases the velocity of the ball.

Answer:172799.2

Explanation: