an object moves 20.0 m in 30.0 s and then returns to its starting point in 50.0 s. what is the average speed of the object?

Answer:

The answer is 34.67 kilograms force

The greatest increase in the motion of molecules in a system would occur in situation (C) where Q=+50 J (heat is added to the system) and W=-50 J (work is done on the system).

When heat is added to a system, the internal energy of the system increases, which causes the motion of molecules to increase. Work done on the system also increases the internal energy of the system. In this case, the heat added to the system is greater than the work done on the system, resulting in a net increase in internal energy and therefore a greater increase in the motion of molecules compared to the other situations.

Situation (A) has no net change in internal energy since Q and W are equal in magnitude but opposite in sign. Situation (B) has a net increase in internal energy, but the increase in heat and work are equal in magnitude, resulting in a smaller increase in the motion of molecules compared to situation (C). Situation (D) has a net decrease in internal energy, which would result in a decrease in the motion of molecules.

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Answer:

Thermometer

Explanation:

Answer:

Displacement, d = 12 meters

Explanation:

The displacement of an object that moves from the origin to a position at −12 m is 12 meters.

The distance from the origin to the maximum position is called displacement of an object. The maximum displacement of the particle in a wave is called crest and the minimum displacement is called the trough. -12 shows the displacement in negative axis.

So, the displacement of an object is 12 meters.

Because a space telescope can monitor radiation over a very wide wavelength range and is located above the earth's absorbing and distorting atmosphere, astronomy from one is very valuable.

Astronomy from spacecraft is especially helpful because the space telescope is above the earth's absorbing and distorting atmosphere and can measure radiation over a very wide wavelength range on the absolute scale of temperature, the zero of which corresponds to the temperature at which the motion of atoms and molecules ceases. Is called space telescope.

In physics, the wavelength is the length over which a periodic wave repeats, or its spatial period. The distance between two adjacent crests, troughs, or zero crossings on a wave are examples of consecutive corresponding points in the same phase.

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Gravitational force on body = 500N

Normal force acting on the body = 400N

Force is an external agent capable of changing a body’s state of rest or motion. It has a magnitude and a direction.

Given,

Acceleration a = 2m/s²

mass m = 50kg

Acceleration due to gravity g = 10 m/s²

Gravitational force = mg = 500N

Using Newton’s second law of motion, the equation of motion can be written as

R+mg = ma

R = m (g – a) = 50 (10 – 2) = 400 N

Hence, gravitational force is 500N, normal force on body is 400N.

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Mugabe gained power by using political strategies, forming alliances, and exploiting his status as a liberation hero within ZANU-PF.

Robert Mugabe, the former president of Zimbabwe, was able to build power through a combination of political strategies and alliances. One key factor was his involvement in the liberation struggle against white minority rule in Rhodesia (now Zimbabwe).

Mugabe emerged as a prominent figure within the Zimbabwe African National Union (ZANU) party, which later merged with the Zimbabwe African People's Union (ZAPU) to form the Zimbabwe African National Union - Patriotic Front (ZANU-PF). Mugabe's role as a liberation hero and his ability to mobilize support among the majority black population of Zimbabwe gave him a strong power base.

Within ZANU-PF, Mugabe strategically positioned himself and gained influence by forming alliances and outmaneuvering rivals. He rose to become the party's leader and played a key role in negotiating the Lancaster House Agreement in 1979, which paved the way for Zimbabwe's independence in 1980. Mugabe became the country's first prime minister and later transformed the position into an executive presidency, consolidating his authority.

Mugabe maintained power through various means, including controlling key institutions such as the military, intelligence agencies, and the ruling party. He also utilized patronage networks, distributing resources and positions to loyal supporters within the party and government. Mugabe's policies, such as the controversial land reform program, further solidified his power base by appealing to nationalist sentiments and redistributing land from white farmers to black Zimbabweans.

However, Mugabe's consolidation of power was also marked by authoritarianism, human rights abuses, and a declining economy. His grip on power faced challenges over the years, including opposition movements, internal party factions, and economic crises. Ultimately, his rule came to an end in 2017 when he was ousted from power following a military intervention.

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Messages travel to and from the brain to other parts of the body through the spinal cord. Thus, brain and spinal cord works together and option A is the correct answer.

The spinal nerves connect the brain to the nerves in the major part of the body. Other nerves connect the brain to the eyes, ears, and other parts of the head directly. This network of nerves relays messages between the brain and the rest of the body.

The brain and spinal cord comprise the central nervous system. The brain is in charge of how we think, learn, move, and feel. The spinal cord relays messages from the brain to the nerves that run throughout the body.

Therefore, brain and spinal cord works together as messages travel to and from the brain to other parts of the body through the spinal cord.

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Answer:

Magnification of the objective lens used and the magnification of the ocular lens.

Explanation: I hope you have/had an amazing day today<3

The question addresses the stability of the atmosphere and the factors that determine convective stability or instability. It also explains the difference between the adiabatic lapse rate of dry air and wet saturated air.

a) The stability of the atmosphere is determined by the temperature profile and relative densities of the air cell and atmosphere. If the temperature of the surrounding atmosphere decreases with altitude at a rate greater than the adiabatic lapse rate of the air cell, the atmosphere is considered convectively stable.

In this case, the air cell will return to its original position. Conversely, if the temperature of the surrounding atmosphere decreases slower than the adiabatic lapse rate of the air cell, the atmosphere is convectively unstable. The air cell will continue moving in the same direction.

b) The adiabatic lapse rate refers to the rate at which temperature decreases with altitude for a parcel of air lifted or descending adiabatically (without exchanging heat with its surroundings). The adiabatic lapse rate of dry air is higher (around \(9.8^0C\) per kilometer) compared to the adiabatic lapse rate of wet saturated air (around 5°C per kilometer).

This difference arises because when water vapor condenses during the ascent of saturated air, latent heat is released, reducing the rate of temperature decrease. A diagram can illustrate the difference between the two lapse rates, showcasing their respective slopes.

c) When wet unsaturated air rises from the ocean surface, its temperature decreases at a rate equal to the dry adiabatic lapse rate. However, if the ambient lapse rate (temperature decrease with altitude) is higher than the adiabatic lapse rate for dry air, a temperature inversion layer forms at higher altitudes.

In this inversion layer, the temperature increases with altitude instead of decreasing. A schematic diagram can depict the temperature changes of the wet air in comparison to the ambient temperature, showing the inversion layer.

Cumulus clouds form at the altitude where the rising moist air reaches the level of the temperature inversion layer. These clouds are formed due to the condensation of water vapor as the air parcel cools to its dew point temperature.

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Answer

D

Explanation:

Potential energy is related to an object's position, and kinetic

energy is related to its motion.

Answer:

(a). The distance is 207 m.

(b). The initial velocity is 45.0 m/s

(c). The maximum height is 103.3 m

Explanation:

Given that,

Time = 4.60 s

We need to calculate the initial velocity

Using equation of motion

\(v=u-gt\)

Put the value into the formula

\(0=u-9.8\times4.60\)

\(u=45.0\ m/s\)

We need to calculate the distance

Using formula of distance

\(d=v\times t\)

Put the value into the formula

\(d=45\times4.60\)

\(d=207\ m\)

We need to calculate the maximum height

Using equation of motion

\(v^2=u^2-2gh\)

Put the value into the formula

\(0=(45.0)^2-2\times9.8\times h\)

\(h=\dfrac{(45.0)^2}{2\times9.8}\)

\(h=103.3\ m\)

Hence, (a). The distance is 207 m.

(b). The initial velocity is 45.0 m/s

(c). The maximum height is 103.3 m

The option that represents your employer's responsibility is to develop a  written hazard communication program. Thus, the correct option for this question is A.

The advantages of a communication program are as follows:

The responsibility of the employer is to develop and articulate the concept of a hazard communication program in detailed written form in order to satisfy the need and requirements of the team, person, society, etc. This becomes more important when it comes to synthesizing the thinking of large members in a single format.

Therefore, developing a written hazard communication program is an option that represents your employer's responsibility. Thus, the correct option for this question is A.

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" 50 W " means " 50 Watts "  or  " 50 Joules per second ".

(500,002 J) / (50 J/sec)  =  10,000.04 seconds

(That's 2 hours 46 minutes 40.04 seconds.)

Answer:

Explanation:

hope this helps!

thermal,true the explanation is because the other guy said so

Answer:

An atom is the smallest part of an element by itself, while molecules are built of multiple atoms.

Answer:

make a rain bow

Explanation:

hope this helps

Answer:

Potential energy can transfer into other forms of energy like kinetic energy. Kinetic energy is energy an object has because of its motion.

Explanation:

The ball was released, as the ball moves faster and faster toward the ground, the force of gravity will transfer the potential energy to kinetic energy.

Answer: It has the skill to nest

sorry if I'm wrong

Answer:

B: A colorful beak

Explanation:

i hope this helped!

There are two forces acting on the sled - the force being applied by the puller and the force of friction between the sled and the surface, the correct option is (b).

The force being applied by the puller is the driving force that causes the sled to accelerate. This force is directed horizontally in the same direction as the sled's motion. The force of friction between the sled and the surface acts in the opposite direction to the sled's motion and opposes the force being applied by the puller. There are no other forces acting on the sled in the horizontal direction since there is no air resistance or other external forces acting on the sled. Additionally, the sled is not moving vertically, so there are no forces acting in the vertical direction. Therefore, the total number of forces acting on the sled is two.

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The complete question is:

Let us consider a sled of mass being pulled by a constant, horizontal force of magnitude along a rough, horizontal surface. The sled is speeding up. How many forces are acting on the sled?

(a). one

(b). two

(c). three

(d). four

Answer:

7.39ev

Explanation:

Energy levels are found inside the atom. Electrons occupy these energy levels depending on the energy they possess. Electrons can move from one energy level to another due to absorption or emission of a photon or other factors. As the electron, jumps from a higher energy level to a lower energy level emitting a photon of measurable frequency, the photon carries energy equal to the amount of energy between the gap of the levels. This idea was first proposed by Neils Bohr and became the forerunner of the wave mechanical model of the atom.

Hence the energy of a photon is the energy of the gap between the two energy levels. Since Ea= 2.48ev and Eg= 10.38 ev.

If an electron jumps from Ea to Eg, the energy of the photon absorbed is given by;

E=Eg-Ea

E= 10.38ev - 2.48ev

E= 7.39ev

The magnitude of force F₂ required for the resultant moment about point C to be zero is approximately 643.92 N.

To find the magnitude of force F₂, we need to balance the moments created by both forces. The moment of a force is given by the equation:

M = F * d * sin(θ),

where M is the moment, F is the force, d is the perpendicular distance from the point of rotation to the line of action of the force, and θ is the angle between the force and the line connecting the point of rotation to the force.

Given:

F₁ = 300 N,

l₁ = 3 m,

l₂ = 7 m,

θ = 35°.

First, we calculate the moment created by force F₁ about point C:

M₁ = F₁ * l₁ * sin(θ).

To balance the moments, we need a force F₂ with a moment equal in magnitude but opposite in direction:

M₂ = -M₁.

Substituting the values and solving for F₂:

F₂ * l₂ * sin(θ) = -F₁ * l₁ * sin(θ),

F₂ = -F₁ * l₁ / l₂,

F₂ = -(300 N * 3 m) / 7 m,

F₂ ≈ -128.57 N.

Since the magnitude of the force is required, we take the absolute value:

|F₂| ≈ 128.57 N.

Therefore, the magnitude of force F₂ required for the resultant moment about point C to be zero is approximately 128.57 N.

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Answer: E 1.29 N•s

Explanation: math

Answer:

I don't know I'm sorry I will tell you another answer asks me

Hypotheses

Null Hypothesis (H₀): The current ozone level is not significantly different from the normal level of 5.8 ppm.

Alternative Hypothesis (H₁): The current ozone level is significantly lower than the normal level of 5.8 ppm.

Z-test statistic

To calculate the z-test statistic, we use the formula:

z = (sample mean - population mean) / (standard deviation / √sample size)

Given:

Sample mean (x) = 5.7 ppm

Population mean (μ) = 5.8 ppm

Standard deviation (σ) = 1.1

Sample size (n) = 990

Plugging in the values:

z = (5.7 - 5.8) / (1.1 / √990)

z ≈ -2.28

Type of test

This is a one-tailed test. We are interested in whether the ozone level is significantly lower, not higher, than the normal level.

Decision rule

Since the significance level is 0.02, we reject the null hypothesis if the z-test statistic is less than the critical value corresponding to a 0.02 (2%) one-tailed significance level.

Conclusion

The z-test statistic value of -2.28 falls in the critical region and is less than the critical value for a 0.02 (2%) one-tailed test. Therefore, we reject the null hypothesis. The data supports the claim that the current ozone level is significantly lower than the normal level at the 0.02 level.

In summary, the data provides evidence to support the researcher's claim that the current ozone level is insufficient at a significance level of 0.02. The calculated z-test statistic of -2.28 falls in the critical region, leading to the rejection of the null hypothesis.

This suggests that there is a significant difference between the observed sample mean of 5.7 ppm and the expected population mean of 5.8 ppm. The ozone level appears to be lower than normal, warranting further attention and investigation.

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Answer:

v = 61.54 km/h

Explanation:

The average speed of the car can be found by using the total distance covered by the car and the total time taken for that distance to be traveled. Therefore, the average speed of the car can be found by the following formula:

\(v = \frac{d}{t}\\\)

where,

v = average speed during the trip = ?

d = total distance driven by the car = 1200 km

t = time taken for the traveling = 19.5 hr

Therefore,

\(v = \frac{1200\ km}{19.5\ hr}\\\\\)

v = 61.54 km/h