MULTIPLE CHOICE QUESTION
If the force produced by the engine is
3400 N to the right and the force caused
by friction is 400 N to the left, what is
the NET FORCE on the car?
3,000 N to the right
800 N
3. ON
e
3,000 N to the left

Answer:

i.e. velocity of boy is 2.82 m/s towards west

Explanation:

Given

mass of boy m_b=70.9\ kgm

b

=70.9 kg

mass of girl m_g=43.2\ kgm

g

=43.2 kg

speed of girl after push v_g=4.64\ m/sv

g

=4.64 m/s

Suppose speed of boy after push is v_bv

b

initially momentum of system is zero so final momentum is also zero because momentum is conserved

P_i=P=fP

i

=P=f

0=m_b\cdot v_b+m_g\cdot v_g0=m

b

⋅v

b

+m

g

⋅v

g

v_b=-\frac{m_g}{m_b}\times v_gv

b

=−

m

b

m

g

×v

g

v_b=-\frac{43.2}{70.9}\times 4.64v

b

=−

70.9

43.2

×4.64

v_b=-2.82\ m/sv

b

=−2.82 m/s

i.e. velocity of boy is 2.82 m/s towards west

Answer:

Tension.

tension is the name of force that opposes or goes opposite of gravity

Hope this helps!

Answer: Friction

Explanation: Friction opposes gravity and any motion in two surfaces.

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True

Compared to Earth, the Moon lacks a hydrosphere (a system of water on its surface, including oceans, lakes, and rivers), an atmosphere and a magnetosphere (a region of space influenced by a planet's magnetic field).

The Moon's surface is dry and lacks significant amounts of water, it has an extremely thin or negligible atmosphere, and it has no substantial magnetic field to create a magnetosphere.

Here's a more detailed explanation:

Hydrosphere: The hydrosphere refers to the presence of water in liquid form on a planetary body. Earth has a significant hydrosphere, with about 71% of its surface covered by water in the form of oceans, seas, lakes, and rivers.

In contrast, the Moon lacks a substantial hydrosphere. While there is evidence of water ice in permanently shadowed regions near the Moon's poles, it is in the form of solid ice rather than liquid water.

Atmosphere: Earth has a dense atmosphere composed primarily of nitrogen (about 78%) and oxygen (about 21%), along with other trace gases. The atmosphere plays a crucial role in regulating temperature, supporting life, and protecting the planet from harmful radiation.

In contrast, the Moon has an extremely thin and tenuous atmosphere, often referred to as an exosphere. It consists of extremely low-density particles, such as atoms and ions, and is practically nonexistent compared to Earth's atmosphere.

Magnetosphere: Earth has a magnetic field generated by its liquid iron outer core. This magnetic field extends into space and creates a region around the planet known as the magnetosphere.

The magnetosphere protects Earth from the solar wind, a stream of charged particles emitted by the Sun. The Moon, however, lacks a significant magnetic field.

It does not have a liquid iron core like Earth, and thus, it does not generate a magnetosphere. As a result, the Moon is directly exposed to the solar wind and its associated radiation.

The absence of a hydrosphere, atmosphere, and magnetosphere on the Moon significantly influences its surface conditions and overall environment.

These factors contribute to the Moon's starkly different appearance and characteristics compared to Earth.

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Answer:

As we all knows that Matter is everything that occupies in space.

(A) There are three major types of Matter;

(B) (I) If John took five ice cubes from the freezer and place them into a cup after 5 minutes, he returned and saw water this process is called melting.

(ii) if he put the same cup into the freezer and turned into ice in 5 minutes this

process is called freezing.

(iii) if John places the ice from the cup into a pot on a lit stove for 2 minutes and leaves, and he returned and find the pot empty this process is called evaporation.

Answer:

Lightning can be described by the flow of electric charges between the cloud and the ground.

The centripetal acceleration of the Olympic track with a radius of 36,5 m where a person runs at a speed of 11 m/s  is 3.315 m/s²

The velocity = 11 m/s

The radius of the track = 36.5 m

The centripetal acceleration can be found using the formula,

            a = v²/r

where a is the centripetal acceleration

           v is the centripetal velocity

           r is the radius of the Olympic track

Let us substitute the known values in the above equation, we get

             a = 11²/36.5

                = 121 / 36.5

                = 3.315

Therefore, the centripetal acceleration is 3.315 m/s²

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Elasticity is of significant importance in the everyday lives of businesses and consumers as it helps them understand and respond to changes in prices and demand for goods or services. By considering elasticity, businesses can make informed decisions regarding pricing strategies, production levels, and resource allocation. Consumers, on the other hand, can assess the impact of price changes on their purchasing decisions and adjust their consumption patterns accordingly.

Elasticity, specifically price elasticity of demand, measures the responsiveness of consumer demand to changes in price. It indicates the percentage change in quantity demanded resulting from a one percent change in price. Understanding price elasticity allows businesses to determine how sensitive consumers are to changes in price and adjust their pricing strategies accordingly.

For example, let's consider the market for gasoline. Gasoline is a highly price-sensitive good, meaning that changes in its price have a significant impact on consumer demand. If the price of gasoline increases, consumers may reduce their consumption and seek alternatives such as carpooling or using public transportation. In this scenario, businesses need to consider the price elasticity of gasoline to predict and respond to changes in consumer behavior. They might lower prices to stimulate demand or introduce more fuel-efficient options to cater to price-conscious consumers.

In conclusion, elasticity matters because it provides valuable insights into the dynamics of supply and demand, enabling businesses and consumers to make informed decisions in response to price changes. By understanding elasticity, businesses can adapt their strategies to maintain competitiveness, while consumers can optimize their purchasing choices based on price sensitivity.

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Answer:

velocity shsjshsuud7dudhdudbe

Answer:

The fireworks give off heat.

Explanation:

Answer:

the foce aplied to make the net force be 0 is 5n force pushing downward on the object becasue it will cancel it out

Explanation:

Answer:

\(\Huge \boxed{\mathrm{citric \ acid}}\)

Explanation:

Citric acid is naturally found in foods and can be safe to eat.

Citric acid is present in oranges, lemons, and other types of citrus fruits that we can eat.

The acid that is naturally found in foods and can be safe to eat would be citric acid, therefore the correct answer is option B .

A chemical compound is a combination of two or more either similar or dissimilar chemical elements.

For example, H₂O is a chemical compound made up of two oxygen atoms and a single hydrogen atom.

As given in the problem statement we have to find out the acid from the given list of options that are naturally found in foods and can be safe to eat.

The sulphuric acid found in batteries, therefore, is not safe to eat, while the citric acid found in different fruits can be safe to eat.

The correct response is option B since citric acid is a naturally occurring acid that may be consumed without harm.

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Reason: The quantity work has to do with a force causing a displacement. Work has nothing to do with the amount of time that this force acts to cause the displacement. Sometimes, the work is done very quickly and other times the work is done rather slowly. For example, a rock climber takes an abnormally long time to elevate her body up a few meters along the side of a cliff. On the other hand, a trail hiker (who selects the easier path up the mountain) might elevate her body a few meters in a short amount of time. The two people might do the same amount of work, yet the hiker does the work in considerably less time than the rock climber. The quantity that has to do with the rate at which a certain amount of work is done is known as the power. The hiker has a greater power rating than the rock climber.

Power is the rate at which work is done. It is the work/time ratio. Mathematically, it is computed using the following equation.

Power = Work / time

or  

P = W / t

Answer:

I answered this question in the comments.

Explanation:

Please stop spamming the website.

The correct answer is(b). There is a physical change from the solid state to a gas state where energy between the molecules increases.

During sublimation, carbon dioxide transitions directly from the solid state (dry ice) to the gas state without passing through the liquid phase. In this process, individual molecules of carbon dioxide gain energy from the surroundings, leading to an increase in their kinetic energy and molecular movement.

As a result, the carbon dioxide molecules separate from each other and form a gas. This phase change is considered a physical change rather than a chemical change since the chemical composition of carbon dioxide remains the same throughout the process.

Therefore, the sublimation of carbon dioxide results in a physical change where the molecules transition from the solid state to the gas state, gaining energy and increasing their molecular movement.

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Answer:

Given

mass (m) =2kg

velocity (v) =3m/s

momentum (p) =?

Form

p=mv

2kgx3m/s

p=6kg.m/s

the momentum of ball's =6kg.m/s

The momentum of a ball having a mass of 2 kg and velocity of 3 m/s is  6 kgm/s.

The product of a particle's mass and velocity is momentum. Being a vector quantity, momentum possesses both magnitude and direction. According to Isaac Newton's second equation of motion, the force acting on the particle equals the time rate of change of momentum.

According to Newton's second law, if a particle is subjected to a constant force for a specific amount of time, the result of the force and time (referred to as the impulse) is equal to the change in momentum. On the other hand, a particle's momentum represents the length of time needed for a consistent force to bring it to rest.

Given:

The mass of the ball, m = 2 kg,

The velocity of the ball, v = 3 m/s,

Calculate the momentum by using the formula given below,

p = m × v

Here, p is the momentum.

Substitute the values,

p = 2 × 3

p = 6 kgm/s

Therefore, the momentum of a ball having a mass of 2 kg and velocity of 3 m/s is 6 kgm/s.

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(A) 300 J of labour are needed to stop the hoop. The hoop has a kinetic energy of \((1/2)mv2 = 300 J.\)  (B) The hoop will roll up the slope for 2.55 m before coming to a stop and rolling back down.

(A) The hoop has a kinetic energy of\((1/2)mv2 = 300 J\). The needed labour is also 300 J since an equivalent amount of work must be done to stop the hoop.

(b) When the hoop ascends the slope, its initial kinetic energy is transformed into potential energy. All of the kinetic energy has been transformed into potential energy at the highest point, making the potential energy there also 300 J. m represents the hoop's mass, and h is the height attained, therefore mgh = 300 J. We arrive at h = 3.06 m after solving for h. The distance climbed up the incline is then calculated using the formula \(d = h/sin(),\)  where is the incline's angle. With the values substituted, we obtain d = 2.55 m.

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Answer:

the answer is point no. a °C , c. K and d. °F

Answer:

C and F

Explanation:

Because that’s how weather people measure tempature

(Brainliest?)

Answer:

pizza dont got no bone in it

Explanation:

Answer:

Pizza have no bones

Explanation:

Because it would be yucky

Answer:

The weight of an object with mass M, in a place with gravitational acceleration G, is:

W = M*G

We know that in the moon, with G = 1.6 m/s^2, the weight is 160N

Then we have the equation:

160N = (1.6 m/s^2)*M

With this, we can find the mass of the astronaut.

(160N)/(1.6 m/s^2) = M = 100kg.

Then in the Earth, where the acceleration is G = 10 m/s^2, the weight will be:

W = (10m/s^2)*100kg = 1000 N

The emergency plan at a nuclear electric power plant must include a means for notification of the public living within of the plant within a 15-minute (c). 10 miles is correct option.

The emergency plan at a nuclear power station in the United States must contain measures for notifying the public living within a 10-mile radius of the plant within a 15-minute window in case of an emergency, under Nuclear Regulatory Commission (NRC) standards for emergency preparedness at nuclear power facilities in the country.

This criterion was put in place to guarantee that, in the event of an issue or accident at a nuclear power station, local residents would be promptly informed and might take the necessary precautions to protect themselves. To reach residents within the specified radius, the emergency notification system often uses broadcast messages, sirens, and other forms of communication.

Therefore, the correct option is (c).

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Answer:

216 J

Explanation:

h = 1.8

a = 9.8

m = 12.2

GPE = HAM = 216

The gravitational potential energy of a suitcase weighing 120 N sits on a counter 1.8 m high in the airport is 216 Joules.

Gravitational potential energy is the energy which is present inside the body of an object which is at rest. This energy is transformed into kinetic energy as soon as the object changes its state of rest to motion.

The gravitational potential energy of an object can be calculated through the formula:

GPE = m × g × h

where, GPE = Gravitational Potential Energy,

m = mass of the object,

h = height covered by the object

w = m × g

where, w = weight of the object

So, the gravitational potential energy of the object is:

GPE = 120 × 1.8

GPE = 216 Joules

Therefore, the gravitational potential energy of the suitcase is 216 Joules.

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Answer:C

Explanation:

For parallel connection

For series connection

Net resistance

The maximum possible speed of the train at the end of the first 4.0 km of the journey is 0 m/s.

To calculate the maximum possible speed of the train at the end of the first 4.0 km of the journey, we can apply the principle of conservation of energy.

Assuming there are no external forces like friction or air resistance, the initial potential energy of the train will be converted into kinetic energy.

The potential energy (PE) of the train at the beginning of the journey can be calculated as PE = mgh, where m is the mass of the train, g is the acceleration due to gravity (approximately \(9.8 m/s^2\)), and h is the height difference (in this case, we assume it to be zero).

The kinetic energy (KE) of the train at the end of the 4.0 km journey can be calculated as \(KE = (1/2)mv^2\), where v is the velocity of the train.

Since the potential energy is converted into kinetic energy, we can equate the two expressions:

PE = KE

\(mgh = (1/2)mv^2\)

Simplifying and canceling out the mass:

\(gh = (1/2)v^2\)

Substituting the values, \(g = 9.8 m/s^2\)and h = 0, we get:

\((9.8 m/s^2)(0) = (1/2)v^2\)

Simplifying further:

\(0 = (1/2)v^2\)

This equation tells us that the maximum possible speed of the train at the end of the first 4.0 km of the journey is 0 m/s.

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What cultular value does this melodic line portray?

answer : reserved...

Answer:

i = 1.2 [amp].

Explanation:

In order to find the current in the circuit, we must perform a sum of voltages equal to zero, around the mesh.

∑V = 0

Let's take the direction of the current as shown in the drawing Clockwise.

\(-3+(i*2)+(i*1)+(i*2)+9=0\\6+(5*i)=0\\5*i = - 6\\i = - 1.2[amp]\)

Note: The negative sign means that the current moves in a counterclockwise direction.

Given :

Initial velocity, u = -15 m/s.

Acceleration , a = 2 m/s².

Time taken to applied brake, t = 2.5 s.

To Find :

The velocity of the car at the end of the braking period.

How far has the car moved during the braking period.

Solution :

By equation :

\(v = u+at\\\\v=-15 + 2\times 2.5\\\\v=-10 \ m/s\)

Now, distance covered by car is :

\(s=ut+\dfrac{at^2}{2}\\\\s=(-15)(2.5)+\dfrac{2(2.5)^2}{2}\\\\s=-31.25\ m\)

Hence, this is the required solution.

Answer:

An unstable form of a chemical element that releases radiation as it breaks down and becomes more stable.

Answer:

Explanation:

Gravity pulls everything down at the same rate of 9.8 m/s/s. If you're looking for the normal force, which is the same as the weight of the object, we'll find that, just in case.

w = mg which says that the normal force/weight of an object is equal to its mass times the pull of gravity:

w = 4.0(9.8) so

w = 39N

a. Therefore, the angular momentum of the fan at t = 3.0 s is 900 kg \(m^2/s.\)

b. Therefore, the net torque on the fan at t = 3.0 s is 600 kg \(m^2/s^2.\)

(a) The angular momentum (L) of the fan is given by:

L = Iω

I = moment of inertia and ω is the angular velocity.

Substituting the given values, we get:

L = \((2.5 kg m^2)(40 rad/s^3t^2) = 100t^2 kg m^2/s\)

The angular momentum at t = 3.0 s, we simply substitute t = 3.0 s into the equation:

L = \(100(3.0 s)^2 kg m^2/s = 900 kg m^2/s\)

(b) The net torque (τ) on the fan is given by:

τ = Iα

α is the angular acceleration.

Taking the derivative of the angular velocity with respect to time, we get:

α = dω/dt = 80 rad/s^3t

Substituting the given values, we get:

τ = \((2.5 kg m^2)(80 rad/s^3t) = 200t kg m^2/s^2\)

To find the net torque at t = 3.0 s, we simply substitute t = 3.0 s into the equation:

τ = \(200(3.0 s) kg m^2/s^2 = 600 kg m^2/s^2\)

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