two cars on a straight road at time zero are beside each other. the first car, traveling at speed 30 m/s, is passing the second car, which is traveling at 24 m/s. seeing a cow on the road ahead, the driver of each car starts to slow down at 6.0 m/s^2. find the expression of the velocity of the second car.

The initial 'launch' speed of a basketball rebounder with a vertical leap of 120 cm is approximately 4.9 m/s. They are in the air for about 1 second, given the symmetry of the jump's ascent and descent.

The best rebounders in basketball who have a vertical leap of 120 cm possess a certain initial launch speed and time in the air. These can be determined using the equations of motion in physics. The equation for the height h in terms of initial speed v, time t, and acceleration due to gravity g (about 9.8 m/s²) is: h = vt - 0.5gt².

(a) Setting h to 1.2 meters (or 120 cm) and t to the time of the peak of the jump (which is when the velocity v becomes 0), we get h = 0.5gt, or v = gt. Plugging in g, we get an initial launch speed off the ground of roughly 4.9 m/s.

(b) To find out how long they are in the air, we recognise that the time to reach the peak and the time to fall back down should be the same, given symmetry. Therefore the total time in air would be 2t, which is also equal to 2v/g. Plugging in the values, we get the athlete is in the air for roughly 1 second.

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The measure that gives the intensity of precipitation from the weather radar is the  rate of dispersion of the microwave energy pulses returning back to the radar .

There are three main ways of measuring intensity of precipitation and they are

For the purpose of your question the weather radar been discussed is the ground based weather radar.

A weather radar is an equipment used for the predetermination of precipitation in a region. it performs this function by sending out microwave energy pulses via tube transmitter into the atmosphere( air ) to detect the possibility of precipitation.

Hence The important measure of the weather radar that helps determine the intensity of the precipitation is; rate of dispersion of the microwave energy pulses sent out to the atmosphere.

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Newton's law of gravitation says that the magnitude f of the force exerted by a body of mass m on a body of mass m is f = Gmm/r² where G is the gravitational constant and r is the distance between the bodies. Then df/dr = Gmm(-2/r³).

A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

The gravitational constant, denoted by the capital letter G, is an empirical physical constant involved in the calculation of gravitational effects in Sir Isaac Newton's law of universal gravitation and in Albert Einstein's theory of general relativity.

f = Gmm/r²

df/dr = Gmm(-2/r³).

Newton's law of gravitation says that the magnitude f of the force exerted by a body of mass m on a body of mass m is f = Gmm/r² where G is the gravitational constant and r is the distance between the bodies. Then df/dr = Gmm(-2/r³).

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A closed container is filled with oxygen. the pressure in the container is 335 k-pa . The pressure in mili meters of mercury 2,513 millimetres of mercury.

The force delivered perpendicularly to an object's surface per unit area across which that force is dispersed is known as pressure. In comparison to the surrounding pressure, gauge pressure is the pressure. Pressure is expressed using a variety of units.

Conversion factor is

1 mm of Hg = 133.322 pascals,

So,  335 kpa the pressure in millimeters of mercury is  2,513 millimetres of mercury.

The pressure in mili meters of mercury 2,513 millimetres of mercury.

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When it comes to the composition of the Earth, three main types of rock come into play. These are known as metamorphic rock, sedimentary rock, and igneous rock, respectively. Also known as “fire rock” (derived from the Latin “ignus”), these type of rock are the most common type of rock in the Earth’s surface. In fact, combined with metaphoric rock, igneous rock makes up 90 to 95% of all rock to a depth of 16 km from the surface.

Igneous rocks are also very important because their mineral and chemical makeup can be used to learn about the composition, temperature and pressure that exists within the Earth’s mantle. They can also tell us much about the tectonic environment, given that they are closely linked to the convection of tectonic plates. But just how are these rocks formed?

In essence, igneous rocks are formed through the cooling and solidification of magma (or lava). As hot, molten rock rises to the surface, it undergoes changes in temperature and pressure that cause it to cool, solidify, and crystallize. All told, there are over 700 known types of igneous rock, the majority of which are formed beneath the surface of the Earth’s crust. However, some are also formed on the surface as a result of volcanic activity.

Those that fit into the former category are known as intrusive (or plutonic) rocks, while those that fit into the latter are known as extrusive (or volcanic) rock. In addition to these, there is also hypabyssal (or subvolcanic rock), a less common form of igneous rock that is formed within the Earth between plutonic and volcanic rocks. hope that helped

To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the number of neutron is 10.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.

Atomic number= number of proton=number of electron

Mass number= number of proton/electron + number of neutron

Mass number=19

atomic number =9

substituting all the given values in the above equation, we get

19=9 + number of neutron

number of neutron=10

Therefore, the number of neutron is 10.

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the correct answer is a discovery

Answer:

Waves interact with  

⇒ objects and other  

⇒ waves.

Explanation:

Answer:

The magnitude is [tex]2000N[/tex]

Explanation:

To solve this question we are going to use the second Newton law.

The second Newton law states that the acceleration of an object is directly proportional to the net force which acts on the object and inverse proportional to the mass of the object ⇒

[tex]a=\frac{F}{m}[/tex]

Which can also be written as :

[tex]F=m.a[/tex] (I)

Where F is the force

Where m is the mass of the object and where ''a'' is the acceleration.

In the problem, we know that

[tex]m=1000kg[/tex]

[tex]a=2\frac{m}{s^{2}}[/tex]

If we replace in the equation (I) :

[tex]F=(1000kg).(2\frac{m}{s^{2}})=2000(kg.\frac{m}{s^{2}})[/tex]

The unit [tex]kg.\frac{m}{s^{2}}[/tex] is defined as N which is called Newton. N is an unit of force.

Finally, the net force exerted on the car is [tex]2000N[/tex]

One disadvantage of using a survey to gather data for psychological purposes is the fact that it can be subject to response bias.

Social Desirability Bias: Respondents may provide answers that they believe are socially acceptable or desirable rather than their true feelings or behaviors. They may want to present themselves in a positive light, which can lead to inaccurate responses.

Acquiescence Bias: Some individuals have a tendency to agree with statements or questions, regardless of their true beliefs.

Extreme Response Bias: On the other hand, some respondents may consistently choose the most extreme response options (e.g., always selecting "strongly agree" or "strongly disagree") without considering the nuances of the questions.

Non-Response Bias: Not all individuals approached to participate in a survey actually respond. Those who choose not to respond may have different characteristics or perspectives from those who do respond, leading to potential bias in the sample.

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Ideal mechanical advantage would be from a device with the assumed probability that there is no friction, wear or flexion. It is the ratio of the force put out (load) to the effort (force put into the machine).

Actual mechanical advantage takes into consideration of friction, wear and flexion. It is the ratio of the effort output and the effort input.

Answer:

Ideal mechanical advantage does not considers frictional losses of force into account whereas actual mechanical advantage does.

Explanation:

Mechanical advantage is the increase in the output force by a simple machine which is due to increased arm length on which the output is desired. This is in accordance with the law of conservation of energy and moments.

Mathematically give as;

[tex]F_E.E=F_L.L[/tex]

where:

[tex]F_L\ \&\ F_E[/tex] are the force due to load and effort respectively.

[tex]E\ \&\ L[/tex] are the length of effort arm and load arm respectively.

Now the mechanical advantage:

[tex]MA=\frac{F_E}{F_L} =\frac{L}{E}[/tex]

In practical cases we are not able to take the full advantage of this multiplied force due to the frictional losses.

Volcanoes come in different shapes, depending on the type of eruption. Shield volcanoes have shallow, sloping sides and are formed by very hot, runny lava that spreads over a wide area. The majority of the volcanoes that happen occur along the cracks in the lithosphere that mark the edges of the tectonic plates.

Answer:

Explanation:

Inertia is the property of any object which always resist any change in the object.

Inertia is measured by the mass of the object.

More be the mass of the object, more be the inertia.

Galileo's law of inertia state that, if a body is at rest it always remains at rest and if a body is in motion it remains in motion, until and unless an external force is not applied on the body.

It is also called Newton's first law of motion.

Platelet is not a macro-molecule.

There are four major macro-molecules in living organisms which include; proteins, carbohydrates, lipids, and nucleic acids.

There exist four major macro-molecules in living organisms.

They include; Nucleic acids, proteins, carbohydrates, and lipids.

Keywords: Macro-molecules, nucleic acids, proteins, carbohydrates, lipids

Level: High school  

Subject: Biology  

Topic: Macro-molecules

Out of the options given, Platelet is not a macromolecule. Macromolecules are large complex molecules like proteins, carbohydrates, and lipids. Platelets are blood cells that help in clot formation.

Out of the options given A. Carbohydrate, B. Protein, C. Platelet, and D. Lipid, C. Platelet is not a macromolecule. Macromolecules are large complex molecules such as proteins, carbohydrates, lipids, and nucleic acids that are essential for life. They are composed of smaller units bonded together. Platelets on the other hand, are tiny blood cells that help your body form clots to stop bleeding. Therefore, they do not fall under the classification of macromolecules.

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During a collision, two cars experience equal and opposite forces according to Newton's Third Law of Motion, but their accelerations differ due to Newton's Second Law as a less massive car will experience a greater change in velocity.

When one car is twice the mass of the other during a collision, the two cars do indeed experience equal and opposite forces according to Newton's Third Law of Motion. This law states that for every action, there is an equal and opposite reaction. Therefore, no matter the disparity in mass, the forces exerted on each other during a collision are equal in magnitude but opposite in direction. Although the forces are equal, the effect of these forces will differ due to Newton's Second Law of Motion, which links the net force acting on an object to its mass and acceleration (F = ma). A less massive car will experience a greater acceleration (or deceleration) than a more massive car under the same force. This concept is crucial in understanding the dynamics of collisions.

Answer:

d is the answer

Explanation:

Answer: A

Explanation:

a. The mechanical work output of the engine during one cycle is 2600 Joules.

b. The thermal efficiency of the engine is equal to 28.89%.

Given the following data:

a. To determine the mechanical work output of the engine during one cycle:

Mathematically, the mechanical work output of an engine during one cycle is given by the formula:

[tex]Work = H_{in}- H_{out}\\\\Work = 9000-6400[/tex]

Work output = 2600 Joules

b. To determine the thermal efficiency of the engine:

[tex]Th_{E} =\frac{Work}{H_{in}} \times 100\\\\Th_{E} =\frac{2600}{9000} \times 100\\\\Th_{E} =0.2889 \times 100[/tex]

Thermal efficiency = 28.89%

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Looking at the position A, we can actually see that velocity vectors connecting position A and its adjacent positions appear to have similar magnitude and in similar direction. Hence the acceleration is zero and similarly, the net force is also zero.

Answer:

Net force is zero

The net force acting on the object at position A is zero, option 5 is correct.

In physics, an object's motion is determined by the net force acting upon it. When multiple forces act on an object, they can either cancel each other out or add together to create a resultant force. At position A, if the forces acting on the object are balanced in such a way that the magnitudes and directions of all forces cancel each other out, the net force is zero.

This means that there is no overall acceleration or change in motion, and the object remains in a state of equilibrium. In other words, the forces pushing or pulling in various directions at position A are perfectly balanced, resulting in a net force of zero, option 5 is correct.

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The complete question is:

What is the direction of the net force acting on the object at position A?

1. upward

2. downward

3. to the left

4. to the right

5. The net force is zero.