Lien is pushing a box across a table. She used a force of 100 N to get the box moving. Which force did she overcome to get the box moving?
a)the downward force of gravity on the box
b)the upward force of the table on the box
c)the reaction force on the box
d)the push force on the box

Answer:

7.5 x 10⁻⁸N

Explanation:

Given parameters:

Mass 1  = 60kg

Mass 2  = 75kg

Distance between the bodies  = 2m

Unknown:

Gravitational fore  = ?

Solution:

The gravitational force between the two bodies can be derived using;

  F  = \(\frac{G mass 1 x mass 2}{distance^{2} }\)  

    G is the universal gravitation constant  = 6.67 x 10⁻¹¹m³kg⁻¹s⁻²

Insert the parameters and solve;

  F  = \(\frac{6.67 x 10^{-11} x 60 x 75}{2^{2} }\)   = 7.5 x 10⁻⁸N

In order to determine the velocity of block A, we need to analyze the conservation of mechanical energy in the system. Let's assume that the incline is frictionless and neglect any potential energy losses due to air resistance.

Mass of block A (m₁) = 60 kg.

Mass of block B (m₂) = 40 kg.

Distance moved by block B up the incline (d) = 2 m.

First, let's calculate the potential energy gained by block B as it moves up the incline:

Potential energy gained by block B = mass * gravity * height.

= m₂ * g * d.

Next, let's calculate the potential energy lost by block A as it moves down the incline:

Potential energy lost by block A = mass * gravity * height.

= m₁ * g * d.

Since the two blocks are connected by a rope, the potential energy lost by block A is transferred to block B as kinetic energy.

Therefore, we can equate the potential energy lost by block A to the potential energy gained by block B:

m₁ * g * d = m₂ * g * d.

Simplifying the equation by canceling out the common terms (g and d):

m₁ = m₂.

Since the masses are equal, the velocity of block A will be the same as the velocity of block B.

Therefore, the velocity of block A will be equal to the velocity of block B when block B reaches a height of 2 m up the incline.

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A. The deodorant evaporates as it absorbs thermal energy from James’s skin

Conduction heat transfer is the transfer of heat by means of molecular excitement within a material without bulk motion of the mater.

Heat transfer process that takes place when the liquid deodorant is sprayed.

When James sprayed liquid deodorant under his arm, the deodorant evaporates as it absorbs thermal energy from James’s skin. This process caused the spot the feel cold.

Thus, the sentence that best explain the process is "The deodorant evaporates as it absorbs thermal energy from James’s skin".

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Yes, hydro energy can be stored. Several renewables can store energy, including hydro, wind, solar, and geothermal power

Example of a location where RPS is used: The United States is an example of a location where RPS is used. It has established RPS policies in more than 25 states. The RPS policy requires electricity providers to source a certain percentage of their energy from renewable sources.

. It is necessary to store renewable energy because renewable energy resources are intermittent, and energy demand is continuously changing throughout the day and night. Renewable energy storage enables energy providers to keep the energy until it is required

. It also allows for a better management system and ensures the stability of the power grid.In some areas, renewables are stored in batteries, which can be recharged by renewable energy sources. Other forms of storage include pumped storage hydropower (PSH), thermal energy storage, and compressed air energy storage (CAES). Feed-in-Tariffs (FIT) and Renewable Portfolio Standards (RPS) are two policies that promote the production and use of renewable energy sources.

These policies are used to encourage the development and adoption of renewable energy, as well as to ensure that energy providers meet a specific percentage of their electricity needs from renewable sources. The difference between FIT and RPS is that FIT is a policy that mandates the purchase of energy at a set rate, while RPS is a mandate that requires a specific percentage of electricity to come from renewable sources.

Example of a location where FIT is used: Germany has one of the most successful examples of FIT policies. In Germany, the FIT policy encourages the development of renewable energy. This policy has been successful in promoting the development of renewable energy projects and increasing the use of renewable energy in the country.

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Answer:

mass equals 375 kg

Explanation:

f=ma

f=7500

a=20

m=f/a

m=7500/20

m=375

1500 kg  is the mass of the car​.

Newton's second law of motion describes the relationship between an object's mass and the amount of force needed to accelerate it.

Newton's second law is often stated as,

F=ma, which means the force (F) acting on an object is equal to the mass (m) of an object times its acceleration (a).

According to the question,

Mass = 20m/s , Time = 4s , Force = 7500 N

a = Δv/Δt

a = 20m/s / 4s

a = 5 m/s²

If F = ma then,

7500 N =  m x 5 m/s²

m = \(\frac{7500 N }{ 5m/s^{2} }\)

m = 1500 kg

Therefore,

1500 kg  is the mass of the car​.

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Hi, to answer your question regarding the comparison of the magnitudes of kinetic energy (K_A and K_B) of puck A and puck B when they reach the finish line, we need to consider the following steps:

1. Kinetic energy is defined as KE = 0.5 * m * v^2, where m is the mass of the object, and v is its velocity.

2. In order to compare K_A and K_B, we need to know the masses and velocities of both pucks A and B at the instant they reach the finish line.

Since the question does not provide any information about the masses and velocities of the pucks, we cannot determine whether K_A is equal to, greater than, or less than K_B. Therefore, the correct answer is: "You need more information to decide."

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Answer:

Explanation:

distance= 3.1 mile

time=0.5 hours

s=d/t

s=3.1/0.5

speed= 6.2 m/hr

If you run for a distance of 3.1 miles in 0.5 hours, then the speed in miles per hour will be 6.2 m/hr.

A scalar quantity in kinematics and common usage, an object's speed is the size of the change in its position over time or the amount of change in its position per unit of time.

As the duration of the time interval approaches zero, the instantaneous speed is the maximum limit of the average speed. The distance traveled divided by the duration of the interval represents the average speed of an object over a period of time.

Given information,

Distance covered, d = 3.1 miles

Time taken, t = 0.5 hours

Speed = \(Distance/time\)

Speed  = 3.1/0.5

Speed = 6.2 m/hr

Therefore, the speed while running is 6.2 m/hr.

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Liquid density affects the buoyance of the object placed in it, since the ability of the object to float depends on the density of the liquid, the denser the liquid the more likely the object will float and vice versa.

Archimedes’ principle states that a body immersed in a fluid experiences an upward force which is equal to the weight of the fluid displaced.

The upward force experienced by an object in a liquid is known as buoyant force.

For Example;

An object which is denser than the liquid \((\rho_o > \rho_l)\) has a positive apparent weight and can sink in the liquid.

An object which is less dense than the liquid \((\rho_o < \rho_l)\) has a negative apparent weight and rises in the liquid.

When the weight of the object is equal to the upthrust \((\rho_o = \rho_l)\), the apparent weight will be zero and the object will float in the liquid. This is known as principle of floatation.

Thus, we can conclude that liquid density affects the buoyance of the object placed in it, since the ability of the object to float depends on the density of the liquid, the denser the liquid the more likely the object will float and vice versa.

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Answer:

Liquid density affects the buoyance of the object placed in it, since the ability of the object to float depends on the density of the liquid, the denser the liquid the more likely the object will float and vice versa.

Explanation:

Answer:

Their father applied more force to Jordan than Kathy.

Explanation:

The volume and density of the 60g material are 120cm³ and 0.5 g/cm³ respectively.

Density is expressed mathematically as;

p = m / v

Where m is mass and v is volume.

Given the data in the question;

First, we calculate the volume of the material.

Volume v = l × w × h

Volume v = 4cm × 5cm × 6cm

Volume v = 120cm³

Now, we determine the density of the material.

p = m / v

p =  60g / 120cm³

p = 0.5 g/cm³

Therefore, the density of the material is 0.5 g/cm³.

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The force is exerted by the elevator is (c) 1600N.

We are given that,

Weight = m = 800 Kg

Acceleration = a = 9.8 m/s²

Acceleration due to gravity = g = 9.8 m/s²

Force exerted by the elevator on the man = f = ?

f = mg + ma

Substituting the values we get,

f = m X (g + a)

f = 800 X (9.8 + 9.8)

f = 800 X 19.6

f = 15680 N

f ≈ 1600 N

If we round off the accelerations in this case to 10 m/s^2 then the force applied to the man by the lift is 1600 N.

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Answer:

Matter can exist in four different states: solids, liquids, gases and plasma.

Explanation:

Hope this helps :)

The volume of the freon-12 at STP is 75.3 L if a sample of freon-12 (cf2cl2) occupies 30.0 l at 25.0°c and 150.0 kpa.

To solve this problem, we need to use the Ideal Gas Law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the temperature in Kelvin.

First, we need to find the number of moles of freon-12 in the sample. We can use the formula n = PV/RT, where P = 150.0 kPa, V = 30.0 L, R = 8.31 J/mol-K, and T = 25.0 + 273 = 298 K. Plugging in these values, we get:

n = (150.0 kPa)(30.0 L)/(8.31 J/mol-K)(298 K) = 3.55 moles

Next, we need to find the volume of the freon-12 at STP (standard temperature and pressure). STP is defined as 0°C (273 K) and 1 atm (101.3 kPa). To find the volume at STP, we can use the formula V = nRT/P, where R and n are the same as before, but P = 101.3 kPa and T = 273 K. Plugging in these values, we get:

V = (3.55 moles)(8.31 J/mol-K)(273 K)/(101.3 kPa) = 75.3 L

Therefore, the volume of the freon-12 at STP is 75.3 L.

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The given problem is about finding the number of revolutions made by a wheel starting from rest and having a constant angular acceleration after 20 s. Let us find out the angular acceleration first.

Angular acceleration (α) is given by the formula, α = (ω₂ - ω₁)/there, α = angular accelerationω₁ = initial angular velocityω₂ = final angular velocity = time takenω₁ = 0 rad/s (As the wheel is starting from rest)ω₂ = 7.5 rad/st = 3 sSo, α = (7.5 - 0)/3 = 2.5 rad/s²This same angular acceleration continues for a further 7.0 s. So, the final angular velocity (ω) of the wheel after 10.0 s (3 s + 7 s) can be calculated using the formula,ω = ω₁ + αt

Where,ω₁ = initial angular velocityω = final angular velocityα = angular acceleration = time takenω₁ = 0 rad/s (As the wheel is starting from rest)t = 10.0 s (3 s + 7 s)So,ω = 0 + (2.5 x 10) = 25 rad/snow, the wheel is under uniform motion from 10 s to 20 s (for the next 10 s) as there is no further angular acceleration. Hence, the total number of revolutions made by the wheel in the first 20.0 s can be calculated as follows:1 revolution = 2π radio, the number of revolutions made by the wheel in 20.0 s = Total angle covered by the wheel in 20.0 s / 2π.

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The vibrational period of the rope, when a student shakes it is 0.25 s.

Frequency is the number of oscillations per second.

Given is the number of vibrations =36 in time t = 9s, then frequency will be

f = 36/9 =4Hz

The time period is the reciprocal of the frequency.

T = 1/f

Plug the frequency value, we get

T = 1/4 Hz = 0.25 seconds

Thus, the vibrational time period is 0.25s.

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In general, a mixture can be separated into its constituents using just physical changes to do the task.

A mixture can be defined as a combination of two (2) or more substances which are present in varied proportion (unfixed ratios). Also, a mixture can be visibly seen with our na-ked eyes and separated by physical means.

A separation technique simply refers to a technique that is used to separate two or more mixture and solution of chemical substances into distinct products or constituents such as solutes, chemical compounds, or elements.

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Complete Question:

In general, a mixture can be separated into its _____ using just physical changes to do the task.

In general, a mixture can be separated into its original components using just physical changes to do the task.

A mixture is a group of materials that can be separated by applying suitable physical-chemical procedures such as for example evaporation procedure, distillation methods, and chromatography methodology. Conversely, a pure component cannot be separated.

Therefore, with this data, we can see that the mixtures can be separated into one or more components, while a pure material contains only one type of substance that cannot be separated.

Complete question:

Fill in the blank. In general, a mixture can be separated into its____________using just physical changes to do the task

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Given that the trench is 11.0 km deep and that saltwater has a constant density of 1029 kg/m3 throughout, the gauge pressure (in atm) due to the ocean at the bottom of the trench is 992.38 atm.

It is positive for pressures above atmospheric pressure and negative for pressures below atmospheric pressure; gauge pressure is the pressure as compared to atmospheric pressure. Any fluid that is not contained has its pressure increased by the atmospheric pressure. Density is defined as the ratio of mass to volume, or mass per unit volume. It is a way to quantify how much "stuff" an object has in relation to its volume (cubic metre or cubic centimeter). In essence, density is a measurement of how closely stuff is packed together.

P = 100552500/101325

P = 992.38atm

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Answer:

Explanation:

Average speed is found by adding together the total distances traveled by the athlete and divide that total by the total time it took.

Average velocity is vector, which means it includes direction. If the athlete heads one way and then turns around, his displacement might actually be negative! Yikes! Let's look at speed first:

\(s=\frac{600+1000}{2+1}=\frac{1600}{3}=533\frac{1}{3}\frac{m}{min}\)

Velocity is the displacements added together divided by the total amount of time it took. The displacement is the same as the distance here, since the athlete did not veer off his straight-path and didn't turn around.

Average velocity = average speed = 533.3 m/min

Answer:

The answer to this is D two of the above

Answer: Evaporation happens when a liquid substance becomes a gas. When water is heated, it evaporates. The molecules move and vibrate so quickly that they escape into the atmosphere as molecules of water vapor

Explanation: Evaporation is simply the heating of water to turn it to gas,like when you boil water in a kettle,that process is defined as evaporation

Answer:

your answer would be 21m

Explanation:

Most stars take millions of years to die. When a star like the Sun has burned all of its hydrogen fuel, it expands to become a red giant then when it fully runs out it then dies

Answer:

. When the core runs out of hydrogen fuel, it will contract under the weight of gravity.

Explanation:

The sound level of a sound wave with intensity 7.83 ✕ 10−5 w/m2 is 78.93 dB .  

The sound level of a sound wave with intensity 7.83 ✕ 10−5 w/m2, we need to use the formula for sound level (L) in decibels:
L = 10 log(I/I0)
where I is the sound intensity in watts per square meter and I0 is the threshold intensity of sound in watts per square meter (1.00 ✕ 10−12 w/m2).

Substituting the given values into the formula, we get:

L = 10 log(7.83 ✕ 10−5/1.00 ✕ 10−12)
L = 10 log(7.83 ✕ 107)
L = 78.93 dB

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The urban legend of the car thief is an example of A Cautionary Tale.

A cautionary tale makes reference to a given tale aimed at the warning the person of some type of danger, which is generally used to alert about a given behavior and may be very useful to modify a behavior pattern in children.

Therefore, with this data, we can see that A cautionary tale is based on warning and can help to modify certain behavior in c children depending on the ability to create conscious.

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Answer:

these organs make up four fifth's of it's body, and gives the electric eel ablity to generate two types of electric organ discharges:low voltage and high voltage

Answer:

Cylinder A has Plasma

Explanation:

The question is incomplete because the figure is not given in the question. I have attached the figure at the bottom for this question. Consult it for better understanding.

We can discard the options C and D as C shows a the characteristics of a liquid (fixed volume) while D shows the characteristics of a solid (fixed shape and volume)

Plasma is basically a state, which is a lot similar, yet different to the state of gas. Like gases, it doesn't have a fixed shape or volume, but unlike gases, it has only charged particles. A plasma can be considered as a charged gas.

As A shows charged ions, while in B, these ions are in pair and are neutralized, we can say that the charged gas is in A. Therefore, option A has plasma

Answer:

C

Explanation:

answer on edge 2021-2022

Hope this helps!!

1) electromagnetism

2) magnetic field

3) electric field

4) strength

Electromagnetism is the fundamental principle behind the functioning of an electric generator. An electric generator works on the principle of electromagnetic induction, which is the process of generating an electric current in a conductor by exposing it to a changing magnetic field.

In a generator, a wire coil is rotated inside a magnetic field, which induces an electric current in the coil. The magnetic field can be created by a permanent magnet or an electromagnet. An electromagnet is made by passing an electric current through a coil of wire, which generates a magnetic field.

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Each magnetic field contains energy, also called magnetic energy. ... Because a magnetic field is generated by electric currents, the magnetic energy is an energy form of moving charge carriers (electrons). To understand where this energy comes from, it's worth taking a look at how a magnetic field works.

Chemical energy, Energy stored in the bonds of chemical compounds. Chemical energy may be released during a chemical reaction, often in the form of heat; such reactions are called exothermic. ... The chemical energy in food is converted by the body into mechanical energy and heat.