A worker has to move a 800 kg crate. He pulls with a force of 5,700 N and
the Force of Friction working against him is 900 N. What is the acceleration
of the crate?

Answer:

To calculate the mechanical advantage of a pulley you simply have to count the number of rope sections that support whatever object you are lifting (not counting the rope that is attached to the effort)

Example:

For example, in a one pulley system the MA is 1. In a two pulley system the MA is 2. The more compound the pulley is the easier the load is to lift. If you were lifting a 600kg object with 2 pulleys you would have to use enough effort to pull 300kg to lift the 600kg object! Therefore your mechanical advantage would be 2 (600/300).

               MA= load/effort OR number of rope sections

Answer:

Explanation:

When dealing with optics, there is an incident wave, a reflected wave, and a transmitted wave. An incident wave is the initial wave coming out from the source, like a flashlight.

Then the reflected wave is created when the incident wave encounters an interface like a piece of glass. The reflected wave will reflect like you would expect.

Then, the transmitted wave is the wave which passes through the interface and continues.

So, a good question would be to ask for the value of the reflected wave function given an initial incident wave.

Another example entirely would be to look at the reflected wave on a tensioned string. If you shake a string up and down, a wave will be sent through it. Once hitting the wall, the wave will reflect back. A good question there is asking how the amplitude of the wave changed.

A measure of mass per unit of volume. It is how much material a certain volume contains. ... If the volume of the object stays the same but the mass of the object increases then its density becomes greater.

The correct answer is option E, which is eastward with a magnitude of 1.8 x 10^5 m/s^2.

A negatively charged particle is placed in a uniform electric field directed West. What are the magnitude and direction of the particle's acceleration if its charge is q= -6 μC, its mass m = 2 grams, and the value of electric field E is 6 x10 N/C?The magnitude of the force experienced by the charged particle (q) is F=qE.From Newton's second law, we know that acceleration is given by:F = maTherefore, we can find the magnitude of acceleration asa = F/mSubstituting the values given in the problem,a = F/m = qE/m = (-6x10^-6 C)(6x10^5 N/C) / 0.002 kg= -1.8x10^3 m/s^2Since the charge of the particle is negative, the force is opposite to the direction of the electric field. Therefore, the force and acceleration both point towards the east.

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Answer:

From a sound standpoint, higher tracking force reduces all other things being equal which might reduce the top end a bit and increase bass.

Answer:

Option E

Explanation:

Option E, ie, Radian is not consider to be a fundamental quantity unit and it is used to measure the plane angle.

Seven Fundamental units are:

Answer:

Explanation:

It's 9.8 m/s^2

Answer:

Speed describes only how fast an object is moving, whereas velocity gives both the speed and direction of the object’s motion being a vector quantity. The standard unit to measure velocity is meter per second (m/s or ms-1). For example, “10 meters per second” is scalar and “10 meters per second West” is vector. Acceleration

The given chemical reaction represents photosynthesis, which is the process of converting light energy into chemical energy. The reactants of this reaction are energy from the sun, six carbon dioxide molecules, and six water molecules. These reactants undergo a complex series of reactions that ultimately result in the production of oxygen gas and glucose.

The energy from the sun is absorbed by pigments in the chloroplasts of plant cells, including chlorophyll. This energy is used to power a series of redox reactions, during which the carbon dioxide is reduced to form glucose.

The oxygen gas produced during photosynthesis is a byproduct of the oxidation of water, which is split into hydrogen ions and oxygen molecules. This process, known as photolysis, requires energy from the sun.

The glucose produced during photosynthesis is an important source of energy for the plant. It is used in cellular respiration to produce ATP, which is used to power the metabolic processes of the cell. Overall, photosynthesis is a complex and essential process that plays a critical role in the biosphere.

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The required density of the glass is given as 2.6 × 10³ kg/m³.

Volume is defined as the mass of the object per unit density while for geometry it is calculated as profile area multiplied by the length at which that profile is extruded.

Here,

Weight of glass in air = 52N
mg = 52N
m = 5.2 Kg

Now,
The difference in weight of glass in air and water,
Upthrust = Volume × density of water × g = 52-32
Volume × 1000 × 10 = 20
Volume = 2 × 10⁻³ m³

The density of glass = mass of glass/volume of glass
                           = 5.2/2 × 10⁻³
                           = 2.6 × 10³ kg/m³

Thus, the required density of the glass is given as 2.6 × 10³ kg/m³.

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The acceleration of the block is 6.4 m/s².

To calculate the acceleration of the block, we need to consider the forces acting on it.

The applied force is 40 N, and since it is the only horizontal force in the direction of motion, it is the net force acting on the block.

The frictional force opposing the motion is 8 N.

The acceleration, we can use Newton's second law, which states that the net force acting on an object is equal to its mass multiplied by its acceleration (F = ma).

The net force is the difference between the applied force and the frictional force:

40 N - 8 N = 32 N.

Now, we can plug the values into Newton's second law:

32 N = 5 kg × a.

Solving for the acceleration (a), we get

a = 32 N / 5 kg

a = 6.4 m/s².

Therefore, the acceleration of the block is 6.4 m/s².

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Answer:

The ways to change the total energy are to either make the hill taller to increase it or make the hill lower to decrease the total energy.

Explanation:

The total mechanical energy of a system is the sum of the total kinetic energy and total potential energy.

Answer:

Put water at room temperature into a vacuum chamber and begin removing the air. Eventually, the boiling temperature will fall below the water temperature and boiling will begin without heating. Or if you want to be easy but messy, add dry ice to a bowl of water and watch how the water starts to boil.

Answer:

there is no graphic

Explanation:

The axial resistance of an axon is calculated using the formula R = ρL/A, where ρ is the resistivity, L is the length, and A is the cross-sectional area. In this case, the axial resistance is 11.28 MΩ.

The resistance along the axon is calculated using the following formula:

R = ρL/A

where:

R is the resistance in ohms

ρ is the resistivity in ohms per meter

L is the length in meters

A is the cross-sectional area in meters squared

In this case, we have:

ρ = 1.6 x 107 Ω.m

L = 0.5 mm = 0.0005 m

A = πr² = π(5 x 10-6)² = 7.854 x 10-13 m²

Therefore, the resistance is:

R = ρL/A = (1.6 x 107 Ω.m)(0.0005 m) / (7.854 x 10-13 m²) = 11.28 MΩ

Therefore, the axial resistance of the axon is 11.28 MΩ.

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Answer: The molecules in gases are different from other states of matter

Explanation:

The molecules in gases are different from other states of matter because unlike, for example, a solid, they move around freely and are much more spread apart. A gas can fill up any container, but once the container is unsealed, the gasses will immedietly be let out. Gases can be compressed much more easily than a solid or a liquid.

The fundamental frequency (in hz) of its vibration is  878.51 Hz

To determine the fundamental frequency of the vibrating string, we used the equation f = 1/(2π)sqrt(T/m). In this equation, T is the tension of the string, m is the mass of the string and g is the acceleration due to gravity. We calculated T by multiplying the total mass (5.50 kg + 7.00 g) by the acceleration due to gravity (9.81 m/s^2) and the length of the string (10.0 m). We then used this value for T in the equation and the mass of the string (0.007 kg) to calculate the fundamental frequency of the vibrating string (878.51 Hz).

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Answer:

sustainability over time.

Explanation:

The largest Brazilian rainforest is the Amazon rainforest, which is the largest rainforest in the world and occupies 42% of the Brazilian territory. The forest is composed of a rich environmental diversity, constituted by many species of fauna and flora and diverse river resources.

However, there is a growing transformation in the Amazon rainforest caused by organizational exploitation that uses its resources to transform the forest area into agricultural land and pastures for livestock. This problem will cause a reduction in sustainability over time, which will cause serious negative effects on the environment, such as a reduction in biodiversity and an increase in the emission of gases responsible for the greenhouse effect on the planet.

Answer:

Bb

Explanation:

The battery's negative and positive terminals have a 6J/C potential difference. This depicts a separation between a positive charge and a negative charge.

Calculation:

W = qV

W/q = V

42/7 = V

V = 6J/C

For every 1 Coulomb of charge that passes between a 12 volt battery's negative and positive terminals, 12 Joules of electric potential energy are produced. Charge to potential energy change changes in a 12:1 ratio. The difference in potential energy for two Coulombs of charge would therefore be 24 Joules.

The cell is charged by current I that comes from another source. In this situation, the terminal potential difference is Ir times bigger than the emf, hence V=E+Ir.

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Answer:

The mouse exerts a force on the ground and the ground exerts an equal and opposite reaction force on the mouse.

At point B, Alberto's distance covered increases with time, equal distance is covered in equal time interval. The speed increases uniformly. At the point C to D, the distance covered with time remains the same. At the point D, equal distance is no longer covered in equal time intervals.

According to the law of inertia, an object will remain at rest or in a state of uniform motion unless it is acted upon by an unbalanced force. This means that smokey mouse will continue moving uniformly unless a force acts on it.

From Newton's second law; F = ma and a = F/m. F = force , m= mass, a = acceleration. This implies that smokey mouse can increase its speed by;

Increasing the force acting on the mouse

Decreasing the mass of the mouse

Action and reaction is encountered as the mouse is walking. The mouse exerts a force on the ground and the ground exerts an equal and opposite reaction force on the mouse.

Explanation:

When lightning strikes, it can create a chemical reaction that combines nitrogen and oxygen in the air to form nitric oxide (NO). This process is known as lightning-induced nitrogen oxides (LNOx) and is a significant contributor to the production of NO in the atmosphere.

NO plays an important role in the chemistry of the atmosphere as it can react with other chemicals to form pollutants such as ozone and smog.

Additionally, NO can also react with other chemicals to form nitric acid, which contributes to acid rain.

While lightning-induced nitrogen oxides only contribute a small fraction to the overall production of NO in the atmosphere, it is still an important process to understand and study in order to better understand the chemistry and composition of the atmosphere.

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Answer:

because of the idea that like charges get repulsion as a force.

Explanation:

because you wrap the ball with foil, the negative charges will leave the foil and go into the ball by induction. This leaves the foil as a positively charged particle since its electrons left it for the ball, making the ball a negatively charged particle. but if you bring the negative charge near the foil, the electrons will transfer from that and go into the foil, making it negatively charged. Now, because the ball and the foil have the same charge, they repel. the foil flies off.

Hello!

a)

Use the kinematic equation to solve for the acceleration:

\(v_{f} = v_{i} + at\)

In this instance, the final velocity is 0 because he comes to a stop. We can solve for the acceleration by plugging in the given values:

0 = 33 + (12)a

0 = 33 + 12a

-33 = 12a

-33 / 12 = a  --> a = -2.75 m/s²

b) Find the amount of distance necessary to stop. Use the formula:

\(v_{f} ^{2} = v_{i} ^{2} + 2ad\)

Plug in the values:

0² = 33² + 2(-2.75 · d)

0 = 1089 - 5.5d

-1089 = -5.5d

d = 198 meters. Therefore, the squirrel would survive.

c)

Find the velocity at 100 meters by using the same formula as before:

\(v_{f} ^{2} = v_{i} ^{2} + 2ad\)

However, in this instance, we are solving for the final velocity. Plug in the given points to solve:

vf² = 33² + 2(-2.75 · 100)

vf² = 1089 + (-550)

vf² = 539

vf = √539

vf ≈ 23.22 m/s.

Answer:

Approximately \(1.3\times 10^{8}\; \rm m\cdot s^{-1}\).

Explanation:

Look up the speed of light in vacuum: \(c \approx 3.00\times 10^{8}\; \rm m\cdot s^{-1}\). Denote the speed as \(c\).

If the speed of light in a medium is \(v\), the refractive index of that medium would be:

\(\displaystyle n = \frac{c}{v}\).

Note, that the refractive index of a medium is inversely proportional to the speed of light in this medium. A medium with a larger refractive index would thus correspond to a slower speed of light.

Rearrange this equation to find the speed of light \(v\) in this medium:

\(\begin{aligned}v &= \frac{c}{n} \\ &= \frac{3.00\times 10^{8}\; \rm m\cdot s^{-1}}{2.4} \\ &\approx 1.25 \times 10^{8}\; \rm m\cdot s^{-1}\end{aligned}\).

When the absolute magnitudes, or brightness's, of stars are plotted against their surface temperatures or colors, we obtain an H-R Diagram.

First it is important to note that the full meaning of H-R in this case is:
Hertzsprung-Russell.

The Hertzsprung-Russell Diagram is an instrument or device that is used for studying starts and other celestial bodies.

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The impulse that Earth exerts on a 210 g apple that is falling from a tree during the first 0.50 seconds can be calculated using the formula for impulse.

Impulse is defined as the change in momentum of an object, and is given by the equation:

J = Δp

where,

J is the impulse.

Δp is the change in momentum.

To calculate the impulse that Earth exerts on the apple, we need to know the initial momentum and the final momentum of the apple during the first 0.50 seconds.

Since the apple is falling freely, its initial momentum is zero (because it is at rest), and its final momentum can be calculated using the formula:

p = mv

where,

p is the momentum.

m is the mass.

v is the velocity.

Since the apple is falling freely, we can use the equation for free fall to find the velocity:

v = gt

where g is the acceleration due to gravity, and t is the time.

At the end of 0.50 seconds, the velocity of the apple can be calculated as: v = gt = (9.8 m/s²)(0.50 s) = 4.9 m/s.

Therefore, the final momentum of the apple can be calculated as:

p = mv = (0.210 kg)(4.9 m/s) = 1.029 kg m/s.

The change in momentum (Δp) during the first 0.50 seconds is simply the final momentum, since the initial momentum is zero.

Therefore, the impulse that Earth exerts on the apple during the first 0.50 seconds is given by:J = Δp = 1.029 kg m/s

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Answer:

R = -2500N

Explanation:

Use formula ΣF = Ma. We can split the Net Force into two parts: Fe - Ff  =  Ma.

Fe is the force developed by the engine: 4000N

Ff (R) is the air resistance projected on the vehicle. This is the value we're looking for.

Mass: 1000kg

Acceleration: 1.5m/s^2

Next, just plug in the values and solve.

▪4000N - Ff  =  (1000kg)(1.5m/s^2)

▪Ff = 1500N - 4000N

▪Ff = -2500N

R = -2500N.

The air resistance acting on the car is R = -2500N.