which of the following best describes the way that scientists make observations

  a₁=2.9 m/s^2          t₁=8 s

   v₁=a₁*t₁= 2.9*8 m/s

  a₂=-1.7 m/s^2          t₂=2.7 s

   v₂=v₁-a₂*t=2.9*8-1.7*2.7 m/s

To determine how far from the base of the dorm Allison should stand to catch the ball, principles of projectile motion are applied using the known angle, speed, and vertical distance. The time of flight for the vertical motion is calculated first, then used to find the horizontal distance where Allison should be positioned.

To solve the problem of where Allison should stand to catch the ball thrown by Emily, we need to apply the principles of projectile motion. The ball is thrown at an angle of 30° below the horizontal with a speed of 14 m/s, and it falls a vertical distance of 4.0 m. We can use these parameters to calculate the time of flight for the vertical motion and then apply that time to the horizontal component of motion to find how far from the base of the dorm Allison should stand to catch the ball.

First, we calculate the time taken for the ball to drop 4.0 m using the equation of motion: s = ut + (1/2)gt², where u is the initial velocity in the vertical direction, g is the acceleration due to gravity (approximated as 9.8 m/s²), and s is the vertical displacement.

Since the vertical component of the initial velocity (u_y) is negative in this case (as the ball is thrown below the horizontal), we must consider u_y = 14sin(-30°) = -7 m/s. The vertical displacement is -4.0 m (downwards). Plugging these values into the equation, we can solve for t.

Once we've found the time t, we then calculate the horizontal distance using the horizontal component of the initial velocity (u_x): u_x = 14cos(30°). The horizontal distance (x) can be found using the equation: x = u_x * t.

Through these calculations, we will be able to determine the distance at which Allison should stand to catch the ball.

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here we need to write the two components of the displacement and then we need to add them

first displacement is given as

[tex]d_1 = 75 km[/tex] 30 degree West of North

[tex]d_1 = - 75 sin30 \hat i + 75 cos 30 \hat j[/tex]

[tex]d_1 = - 37.5 \hat i + 64.9\hat j[/tex]

Other displacement is given as

[tex]d_2 = 155 km[/tex] 60 degree due East of North

[tex]d_2 = 155 sin60 \hat i + 155 cos60 \hat j[/tex]

[tex]d_2 = 134.2 \hat i + 77.5 \hat j[/tex]

now we need to find the net displacement

[tex]d = d_1 + d_2[/tex]

[tex]d = (-37.5 + 134.2)\hat i + (64.9 + 77.5)\hat j[/tex]

[tex]d = 96.7\hat i + 142.4\hat j[/tex]

so it is given as

[tex]d = \sqrt{96.7^2 + 142.4^2}[/tex]

[tex]d = 172.1 km[/tex]

and its direction is given as

[tex]\theta = tan^{-1}\frac{96.7}{142.4} = 34.1 degree[/tex]

so it will displace by 172.1 km at 34.1 Degree East of North

The object is at rest.

This is due to the fact hwen two forces act upon each other on opposite sides, the movement of the object does not change due to the net force equaling 0.

'6' is the angle of incidence.

'7' is the angle of reflection.

Answer:

False

Explanation:

When the object hits the water, it's not adding weight to the object, but is changing the force of the waves in the water. They wouldn't be balanced and this wouldn't determine if the object would stop. However, with more informational variables with precise measurements the answer may alter.

Mass is the amount of matter that an object contains. Don't understand the question.. 100 grams of something is an amount of matter with a mass of 100 grams. I'm guessing composition

When Amelia apply brakes the car will start reducing its speed and then finally stop

So here as per Newton's First law we can say all object continue its state of motion until and unless some unbalanced external force act upon its.

This property is due to inertia of the object which is the property of mass. Here inertia is the property which resist the change in state of motion of an object.

If brakes are applied and an object stops after some time (let say t = 5 s) and on applying brakes other object stop in other time (let say t = 10 s) then if other object took longer time to stop then it means its inertia will be more.

So its all depends on inertia of object that how much time it will take to stop after applying brakes

So correct answer is

B.  inertia

Answer:

B

Explanation:

Inertia

i believe it is element or compound

The different colors in the sky are caused by the scattering of sunlight in Earth's atmosphere. Blue light scatters more efficiently than other colors, resulting in the blue color of the sky.

The different colors that appear in the sky are caused by the scattering of sunlight. When sunlight enters Earth's atmosphere, it scatters from the molecules of air. The small size of the air molecules causes blue light to scatter more efficiently than other colors, such as greens, yellows, and reds. Therefore, the blue light is scattered all over the sky, resulting in the blue color of the sky.

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Sound waves  are a change of pressure that moves through matter. (C)

It's the old-but-important concept:  "Speed" depends on who's measuring it and how THEY're moving.  Different observers may very well observe different speeds, and they're all correct.  There's no such thing as "the REAL speed".

When you were a little kid, did you ever get on a moving escalator or walkway, and when you got to the middle, you turned around and walked the opposite way, so that somebody watching you from the outside would see you not moving at all ?

Say you're on a school bus that's driving 10 mph along the street pavement, and you get up out of your seat and run forward up the aisle at 10 mph.  Somebody outside the bus sees you passing them at 20 mph !

If instead, you run toward the BACK of the bus at 10 mph, somebody outside the bus sees you bobbing up and down but not moving forward or backward at all.

All this  problem is saying is:  The bus is driving along at 15 m/s.  A passenger on the bus puts his little baseball down on the floor on its little feet, and it runs backwards down the aisle, toward the back of the bus, at 15 m/s.  Somebody is standing outside looking into the bus as it passes by and the little baseball is scurrying toward the back of the bus.  How will HE describe the motion of the baseball ?    

Have you got it now ?

"Relative to the Earth" just  means how fast an object is passing the stores and telephone poles and people standing still ... things that are attached to the Earth.  "Relative to the bus" would mean how fast an object is passing by people sitting on the bus.

Answer:

Water is a simple compound.

Explanation:

Water, from first glance, is a simple compound. This is because it is made up of two atoms - hydrogen and oxygen. This gives the formula:

[tex]H_{2}O[/tex]

In the simple compound, one atom of oxygen is bound to two hydrogen atoms like this:

[tex]H - O - H[/tex]

The bonding in water is hydrogen bonding.  This is a bonding that takes place between the oxygen atom and a hydrogen atom of the next water molecule.

This makes the water molecule an interesting molecule.

Trade winds near equator blows in curve path instead of straight path. This is because of earth rotation. This effect of earth rotation that cause wind to move in curve motion is called Coriolis effect. These kind of wind blows at the northeast of the North hemisphere and southeast of the South hemisphere. The trade wind are warm and it blows due to rising of hot air from equator.

Final answer:

Trade winds don't blow straight toward the equator because the Coriolis effect causes deflection to the right in the northern hemisphere, forming northeast trade winds, and to the left in the southern hemisphere, forming southeast trade winds.

Explanation:

The trade winds don't blow straight toward the equator due to the influence of the Coriolis effect, which is caused by the rotation of the Earth. In the northern hemisphere, air moving toward the equator is deflected to the right, creating the northeast trade winds. Conversely, in the southern hemisphere, air moving toward the equator is deflected to the left, resulting in the southeast trade winds. These winds converge near the equator in the Intertropical Convergence Zone (ITCZ), leading to very wet conditions and the formation of the world's great rainforests.

Your answer is 40 degrees Celsius

104f in celsius is 40c

f=ma is newton's second law ...68x1.2=68+2/10x68 = 68+13.6=81.6n

Answer:

81.6N

Explanation:

Force = Mass x Acceleration

Force = 68 x 1.2

Force = 81.6

Units = Newtons

81.6 N

(81.6 Newtons)

Answer:

the acceleration will be 10 m/s^2

Explanation:

the force applied to an object and the acceleration of the object are directly proportional, as Newton's second law states:

[tex]F=ma[/tex]

where

F is the net force applied to the object

m is the object's mass

a is the object's acceleration

in the first example, a force F=45 N is applied to the object, giving it an acceleration of a=5 m/s^2. Therefore, the mass of the object is

[tex]m=\frac{F}{a}=\frac{45 N}{5 m/s^2}=9 kg[/tex]

In the second example, the force is doubled, so it will be F=90 N. The mass is still m=9 kg, so the acceleration will be

[tex]a=\frac{F}{m}=\frac{90 N}{9 kg}=10 m/s^2[/tex]

Instantaneous velocity is the rate of change of an object's displacement at a specific instant or point in time, as opposed to over an extended period.

The instantaneous velocity of an object is the rate of change of the object's displacement with respect to time at a specific instant. Unlike average velocity, instantaneous velocity considers not the total distance and total time but the position of the object at a particular instant. For example, if a car moves with different speeds and you want to know the velocity of the car at the 5th second, you would be looking for the car's instantaneous velocity at that specific time.

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Answer:

When a physical change occurs, the mass of the substance is conserved. This means that the total mass of the substance remains the same from beginning to end. The physical properties of the substance, such as size and shape, may change, but the amount of matter in the substance does not change.

Explanation:

The mass is conserved during a physical change is observed by the fact that the amount of matter in the substance does not change.

According to the principle of conservation of mass, a mass can neither be created or destroyed. It can only be converted into another form.

When a physical change occurs, the mass of the object is constant. The initial mass of the object is equal to the final mass of the object. The physical change like size and shape may occur, but the mass of the object does not change.

Learn more about  conservation of mass principle.

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Im not sure about this one but the one i will go for is a.

(45 km/hour west) · (0.5 hour) =

(45 · 0.5) · (km · hour west/hour) =

22.5 km west

There are no accurate descriptions on the list of choices you provided.

Answer:

The SI System, Which is based on the metric has been more widely adopted than the english system and is harder to use.

Explanation:

The friction force is equal to 120 N. This is based on Newton's First Law. The friction force balances the pushing force, thus keeping the box stationary.

When you push on a large box with 120 N of force and it does not move, it means that the friction force opposing your push is equal to the pushing force. This is based on Newton's First Law of Motion which states that an object in motion tends to stay in motion and an object at rest tends to stay at rest unless acted upon by an unbalanced external force. Friction is the resisting force that occurs between two surfaces in contact when one or both of the surfaces are moved or attempt to move. In this case, the friction force is 120 N because it precisely offsets the applied force, keeping the box stationary.

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T = tension force in the cable

m = mass of the flowerpot = 10 kg

θ = angle cable makes with the horizontal = 30 deg

there are horizontal and vertical components of tension force . The vertical component of tension force in cable is in opposite direction of the weight of the flowerpot. hence vertical component of tension balances the weight of flowerpot. so we can write

T Sinθ = mg

inserting the above value

T Sin30 = 10 x 9.8

T(0.5) = 98

T = 98/0.5

T = 196 N

Any object which is in state or rest is made to change its by applying the external force. An object is made to move or stay still due to its inertia.

Mass is the measure of inertia . Greater the mass, greater will be the inertia.

Inertia is the opposition caused to the motion of an object whether it is still or moving. It is a tendency to do nothing or remain unchanged.

Hence, Inertia causes an object to move or stay still.

Learn more about inertia.

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Objects move or stay still based on Newton's first law of motion or the law of inertia, which states that an object will continue its current state of rest or constant motion unless an external force acts upon it.

What causes objects to move or stay still can be explained by Newton's first law of motion, also known as the law of inertia. This law states that every object will continue to be in a state of rest or move at a constant speed in a straight line unless it is compelled to change by an outside force. For example, if you slide a book on a table, it eventually stops because of the friction (an outside force) between the book and the table.

Similarly, an object moving in an elliptical path, such as a planet, must be subjected to a constant force that keeps changing its direction. Newton proposed this force to be gravity. So, if you throw a ball (a small scale example), it eventually drops to the ground because of the gravitational pull of the earth.

Therefore, without an external force, a stationary object stays put, and a moving object keeps moving at the same speed and in the same direction.

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Final answer:

The potential energy gained by driving the car from sea level to Nu’uanu Pali lookout is approximately 3,589,260 joules.

Explanation:

To calculate the potential energy gained by driving your car from sea level up to the Nu’uanu Pali lookout, we can use the formula: PE = mgh, where m is the mass of the car, g is the acceleration due to gravity, and h is the change in height. In this case, the mass is 1000 kg, g is approximately 9.81 m/s², and h is 366 m. Plugging in the values, we get:

PE = 1000 kg * 9.81 m/s² * 366 m = 3,589,260 joules

So, driving your car up to the Nu’uanu Pali lookout increases its potential energy by approximately 3,589,260 joules.

Blueberries is the correct answer

The right option is (C).

The potassium-40 is the isotope of potassium which has the half-life of 1.251×109 years to reduce its half quantity. There are rare elements present on earth which follow the two type of beta decay. Potassium-40 is one of them which can decay as beta decay to convert into Ca-40 or electron capture decay to convert into the Ar-40. In this second decay, they also emit gamma rays. So, the right option is (C) which wrong regarding the transmutation.

In the examples given, the transmutation process either involves the emission of particles or the bombardment with neutrons, which leads to a change in the atomic number and transforms the element into a different one. The exception is option C) where Potassium-38's release of a beta particle results in its transformation into Argon-40, not Argon-38 as stated.

Transmutation in chemistry refers to the process wherein an atom of one element is changed into an atom of another element through a nuclear reaction. Of the options provided: A) Uranium-238 emitting an alpha particle to form Thorium-234, B) Uranium-238 being bombarded with a neutron to produce Uranium-239, and D) Plutonium-239 bombarded with two neutrons to produce Americium-241 and a beta particle, are all examples of transmutations. These include the emission of particles or bombardment with neutrons leading to change in the atomic number and forming a different element. However, option C) Potassium-38 releasing a beta particle to form Argon-38 is not an example of a transmutation. In this case, Potassium-38 release of a beta particle results in a change in atomic number from 19 to 18, transforming into Argon-40, not Argon-38 as stated.

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initial speed by which Hilary is walking = 1.3 m/s

Now the rate of increase in her speed that is her acceleration is given by

[tex]a = 0.090 m/s^2[/tex]

now we need to find her final speed after t = 10 s

so here we can use the kinematics equation in order to find the final speed

[tex]v_f = v_i + at[/tex]

now plug in all data in the above equation

[tex]v_f = 1.3 + (0.090 * 10)[/tex]

[tex]v_f = 1.3 + 0.90[/tex]

[tex]v_f = 2.2 m/s[/tex]

so here the final speed will be 2.2 m/s after she accelerates

Zero latitude gets the most direct sun all year around. That's the equator.

The picture you attached has nothing to do with this question.

The Equator (0 degrees latitude) receives the most direct rays of the sun year-round due to being at the midpoint of the Earth's surface. As we move towards poles, the sunlight becomes less direct.

The latitude that receives the most direct rays of the sun year-round is 0 degrees, also known as the Equator. The rays of the sun hit the equator directly because it is the midpoint of the Earth's surface. As you move away from the Equator, either towards the North or South Pole (which are 90 degrees latitude), the sun's rays hit the Earth's surface at increasingly oblique angles, resulting in less direct sunlight. Hence, options B, C, and D (30 degrees, 60 degrees, 90 degrees respectively) receive less direct sunlight compared to the Equator (0 degrees).

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