A tennis ball is thrown vertically upwards at 29 m/sec from a height of 80 m above the ground. Determine the time it takes (in sec) for the tennis ball to hit the ground. (Use g = 9.8 m/s^2)

Answer:

food chain is a process of how food is transported to the plant and then to the animal that eats the animal. there are primary, secondary, and tertiary and then decompose.

Explanation:

plz mark my answer as the brainliest

Answer:

A hierarchical series of organisms each dependent on the next as a source of food.

Explanation:

Hope this helps!! plz mark brainliest-Lily ^_^ ( food chain also known as the Circle Of Life)

Answer:

Explanation:

Since the bell is at rest in an elevated position, we can assume that it only has potential energy.

U=mgh is the formula for potential energy where U=potential energy, m= mass, g=acceleration due to gravity, and h=height.

Plug in known variables....

U=200kg*9.8m/s^2*45m

U=88200 joules of potential energy or letter D.

Given:

The acceleration of the car is

The initial velocity is

The final velocity is

Required: The time taken by the car to reach the position of rest.

Explanation:

The time can be calculated by the formula

On substituting the values, the time will be

Final Answer: The time taken by the car is 4.8 s.

The time spent in the air by the ball at the given momentum is 6.43 s.

The given parameters;

The impulse experienced by the ball is calculated as follows;

\(Ft = \Delta P\)

where;

\(Ft\) is impulse

\(\Delta P\) is change in momentum

The time of motion of the ball is calculated as follows;

\(t = \frac{\Delta P}{F} \\\\t = \frac{0.9 - 0}{0.14} \\\\t = 6.43 \ s\)

Thus, the time spent in the air by the ball at the given momentum is 6.43 s.

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The force on each charge will be 5 N. The electric force in case 2 is obtaining the value from case 1.

The force of attraction between two charges, according to Coulomb's law, is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.

The electric force is found as;

\(\rm 20 = \frac{Kq^2}{1^2} \\\\ Kq^2=20\)

The force on each charge in case 2 is found as;

\(\rm F= \frac{20}{2^2} \\\\ F= \frac{20}{4} \\\\ F= 5 \ N\)

Hence, the force on each charge will be 5 N.

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Regulating the amount of light involves controlling the brightness, while condensing the light refers to focusing and concentrating the light rays.

In physics, regulating the amount of light and condensing the light are two distinct concepts.

Regulating the amount of light involves controlling the intensity or brightness of light. This can be achieved through various methods, such as using dimmer switches or adjustable light sources. By increasing or decreasing the amount of electrical current flowing through a light source, the brightness can be adjusted accordingly. For example, dimmer switches in homes allow users to control the brightness of their lights.

Condensing the light refers to focusing or concentrating the light rays. This is often accomplished using optical devices like lenses or mirrors. These devices manipulate the path of light, causing the rays to converge into a smaller area. As a result, the light becomes more concentrated and focused. This concept is widely used in applications such as photography, where lenses are used to focus light onto the camera sensor.

While regulating the amount of light is about controlling the brightness, condensing the light is about focusing and concentrating the light rays.

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Regulating the amount of light is about controlling the overall brightness or intensity of light, while condensing the light is concerned with focusing or concentrating light beams to a smaller area or specific point.

Regulating the amount of light and condensing the light are two distinct concepts related to controlling and manipulating the intensity and distribution of light. Here is a comparison between the two:

Regulating the Amount of Light:

Regulating the amount of light refers to adjusting the intensity or brightness of light. It involves controlling the output or transmission of light to achieve desired lighting levels.

This can be done using various methods, such as dimming switches, adjustable light fixtures, or using curtains, blinds, or shades to block or filter incoming light. The objective is to create an appropriate lighting environment for different purposes, such as providing ambient lighting or creating a specific mood or atmosphere.

Condensing the Light:

Condensing the light involves focusing or concentrating light rays to a smaller area or a specific point. This is typically achieved by using optical devices such as lenses or mirrors.

The purpose of condensing light is to increase its intensity or to direct it to a specific location for enhanced illumination or focused illumination. Condensing light can be useful in applications where concentrated light is required, such as in spotlights, projectors, or laser systems.

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Answer:

hai >.<

Explanation:

Answer:

hello!

Explanation:

~evita

Answer:

Motion

Acceleration is the change of velocity per unit time, so if there is no force, all we know is that the acceleration is zero. Therefore, the velocity is not changing. If the object was already moving, then it will just keep moving. So, the object can be moving even when there is no force applied to it.

Forces may cause an object to change its state if it is unable to move. The force make the object to move from its state of rest.

Force is an external agent acting on an object to deform it or to change it state of rest or motion. There are various kinds of forces such as gravitational force, nuclear force, magnetic force, frictional force etc.

Force is a vector quantity thus, it is characterised by its magnitude and direction. According to Newton's first law of motion, an object will continue in its state or motion or rest until an external force acts on it.

Therefore, force changes the state of an object. Force is dependant on the mass of the object. Greater the mass, greater will be the force required to move the object from stationary to stop it from motion.

According to second law of motion, force is the product of mass and acceleration of the object. Hence, force accelerates the body and a change in force changes the acceleration of the object.

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In order to form a hypothesis that would illustrate the relationship between mass and kinetic energy, we first need to understand what kinetic energy and mass are and how they are related. Kinetic energy is the energy that an object possesses due to its motion, and is given by the formula KE = 0.5mv², where m is the mass of the object and v is its velocity. Mass, on the other hand, is a measure of the amount of matter in an object.

The relationship between mass and kinetic energy is direct, meaning that as mass increases, so does kinetic energy, provided that velocity remains constant. Similarly, if velocity increases, then kinetic energy will increase as well, provided that mass remains constant.

The hypothesis that illustrates this relationship can be stated as follows:If the mass of an object is increased, then the kinetic energy of the object will also increase, because kinetic energy is directly proportional to mass, assuming velocity remains constant.In other words, if the mass of an object is doubled, then its kinetic energy will also double, assuming that its velocity remains constant. This hypothesis can be tested through experiments that involve measuring the kinetic energy of objects with different masses, but with the same velocity.

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If the mass of an object increases, then its kinetic energy will increase proportionally because mass and kinetic energy have a linear relationship when graphed.

Answer:Is it possible to have positive acceleration with a negative velocity?

Explanation:An object which moves in the positive direction has a positive velocity. If the object is slowing down then its acceleration vector is directed in the opposite direction as its motion (in this case, a negative acceleration).

Answer:

Movement

Explanation:

Answer:

Is a tree an example of chemical energy?

Take, for example, an apple tree. The tree absorbs light energy from sunlight, converting the light energy into chemical potential energy stored in chemical bonds. The tree uses this energy to build leaves and branches and fruit. ... Then it takes that heat and converts it into motion, or kinetic energy

Explanation:

The spring's stiffness or spring constant, K, is a physical quantity that is equal to the force required to displace a spring a certain distance per unit displacement.

Determining the speed of the plane:

Given: Spring constant, K = 5.7 x 10^4 N/m, Force = 1.7 x 10^4 kg × g = 1.67 × 10^5 N; where g is the acceleration due to gravity.So, F = ma = 1.67 × 10^5 N, and let the velocity of the plane be V. The net force F acting on the plane is equal to the force of the spring, which is proportional to its displacement x, so F = -Kx, where the negative sign denotes that the direction of the force is opposite to the direction of displacement, x = 29 m.

So, F = Kx = 5.7 × 10^4 N/m × 29 m = 1.653 × 10^6 N.

F = ma can be rewritten as ma = 1.653 × 10^6 N, and the plane's initial KE is (1/2) mv^2; the final KE of the plane is zero when it is stopped by the spring will be 1/2 mv^2 = 1.653 × 10^6 N.

If the velocity of the plane was V, then 1/2 × 1.7 × 10^4 kg × V^2 = 1.653 × 10^6 N. Thus, V = 54.9 m/s or 197.6 km/h.

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The speed of the spaceship as measured by the earth observer is 0.4c.

To determine the speed of the spaceship, we can use the time dilation formula:
Δt' = Δt/√(1-v²/c²)
where Δt is the time interval measured by the earth observer, Δt' is the time interval measured by an observer on the spaceship, v is the velocity of the spaceship, and c is the speed of light.
In this case, Δt' = 0.75 μs and the proper length of the spaceship, L, is 300 m.
Using the equation for proper length contraction, we can find L' = L/√(1-v²/c²)
Solving for v in both equations and equating them, we get:
v = (L/L') * c * √(1-((Δt/Δt')²))
Plugging in the values, we get v = 0.4c, where c is the speed of light. Therefore, the speed of the spaceship as measured by the earth observer is 0.4 times the speed of light.

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Four views of a horseshoe magnet and a current-carrying wire are shown in the drawing. The wire is perpendicular to the screen, and the current is directed out of the screen towards you.

The magnetic force acting on a current-carrying wire is influenced by the direction of the current flow and the direction of the magnetic field, which is decided by the magnetic pole it is near. The magnetic field lines created by a bar magnet, for example, run from the north to the south pole.In the given figure, the magnetic field lines are moving from north to south, as shown by the white arrow.

When the direction of the current is perpendicular to the direction of the magnetic field, a magnetic force is exerted on the current-carrying wire. According to the right-hand rule, the magnetic force on the wire will be perpendicular to both the current-carrying wire and the direction of the magnetic field.

According to the right-hand rule, magnetic force will be directed north in the first view (A), and magnetic force will be directed east in the third view (C).

Therefore, magnetic force on the current points due north in the first view (A).Hence, the answer is the first view (A).

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Answer:

The force of attraction between the molecules of the same substance

Explanation:

Answer:

7.37 degree

8.54

Explanation:

yan po ang sagot sana makatulong

Answer:

27.9617 mi/h

Explanation:

Speed= distance/time

S= 15000/1200

Part A
Here, we have to find out the final displacement from the origin. In order to find the displacement, we have to find out the net distance travelled by the delivery truck.

First we will find the total distance covered in the north and south direction:21 blocks north, 27 blocks southSo, the net distance travelled in north-south direction = (21-27) blocks = -6 blocksNow, we will find the total distance covered in the east and west direction: 15 blocks east.

So, the net distance travelled in east-west direction = 15 blocks Net distance travelled = √(6² + 15²) ≈ 16 blocks. So, the final displacement from the origin (magnitude) is 16 blocks.

Part B

To find the final displacement from the origin (direction), we have to find the direction of the displacement. Here, the delivery truck travels 21 blocks north, 15 blocks east, and 27 blocks south.

So, the displacement vector has two components, i.e. one in north-south direction and another in east-west direction. Net displacement in east-west direction = 15 blocksAnd, net displacement in north-south direction = -6 blocks

Therefore, the angle of the displacement vector with the east direction can be found as shown below:θ = tan-1((-6)/15)≈ -22.6°The angle is negative because the vector is in the opposite direction to the east direction. Therefore, the final displacement from the origin (direction) is 23° west of the north direction (approximate to three significant figures).

Magnitude : The simple definition of magnitude is "distance or quantity." In the sense of motion, it depicts the absolute or relative direction or size of an object's movement. It is used to convey something's size or scope. In material science, extent by and large alludes to distance or amount.

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Answer:

They were told that they had very severe cases of stuttering.

Explanation:

The monster study conducted in 1939 was a certain stuttering experiment that was done by Wendell Johnson on 22 Orphan at the University of Iowa, United States. Eleven of the children got positive speech therapy while the other half was seen to have negative speech therapy which belittled them for their speech imperfections.  

The experiment was called monster because many people were horrified that such experiments could be done on children who were orphans.  

B. They were told that they had very severe cases of stuttering.

The Monster Study was conducted by Dr. Wendell Johnson to learn more about why children developed a stutter and to see if stuttering was a result of learned behavior. However, there are several ethical problems with the the Monster study.

In this study, psychologists tell the group of orphans who did not suffer from stuttering that they had very severe cases of stuttering.

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the answer is c, inherited traits are controlled by genes, which are found in chromosomes

When a vertically falling firecracker bursts, the vector sum of momentum fragments does not satisfy either of the given options. The correct answer is d) neither of these.

When the firecracker bursts, it explodes in multiple directions, resulting in the fragmentation of its mass. The momentum of the fragments is distributed in various directions, including both horizontal and vertical components.

Therefore, option a) is incorrect because the horizontal momentum fragments do not cancel out to zero. Option b) is also incorrect because the vertical momentum of the fragments does not necessarily equal the momentum of the firecracker before bursting.

The bursting of the firecracker introduces additional velocities and forces that alter the distribution of momentum among the fragments.

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Answer:

A. Her speed is 4.4 m/s, and her velocity is 0 m/s.

Explanation:

Given parameters:

Length of path = 400m

Time taken  = 6min = 360s

Unknown:

Speed and velocity  = ?

Solution:

Velocity is the displacement divide by the time. Displacement takes into the account the distance covered with specific reference to direction. Since the student started and ended the journey on the same spot, the net displacement is 0.

So,

  Since velocity  = \(\frac{displacement }{time}\)

            Velocity  = 0

Speed is the distance divided by time;

  One lap = 400m,

   four laps  = 400 x 4 = 1600m

Speed  = \(\frac{1600}{360 }\)  = 4.4m/s

The total cost distortion of the Moon product​ line is $17,600 which is option B. By $38.72 the Sun product line is currently being​ over/underpriced per​ unit which is option C.

Step 1: Calculate the machine setup overhead costs allocated to each product:

For Sun:

Number of setups for Sun = (Number of units of Sun) / 10

= 2,000 / 10

= 200 setups

Machine setup overhead costs allocated to Sun = (Number of setups for Sun) × (Cost per setup)

= 200 × $48,000

= $9,600,000

For Moon:

Number of setups for Moon = (Number of units of Moon) / 25

= 1,000 / 25

= 40 setups

Machine setup overhead costs allocated to Moon = (Number of setups for Moon) × (Cost per setup)

= 40 × $48,000

= $1,920,000

Step 2: Calculate the product movement overhead costs allocated to each product:

For Sun:

Number of moves for Sun = (Number of units of Sun) / 25

= 2,000 / 25

= 80 moves

Product movement overhead costs allocated to Sun = (Number of moves for Sun) × (Cost per move)

= 80 × $32,000

= $2,560,000

For Moon:

Number of moves for Moon = (Number of units of Moon) / 50

= 1,000 / 50

= 20 moves

Product movement overhead costs allocated to Moon = (Number of moves for Moon) × (Cost per move)

= 20 × $32,000

= $640,000

Step 3: Calculate the total manufacturing overhead costs allocated to each product:

Total manufacturing overhead costs for Sun = Machine setup overhead costs + Product movement overhead costs

= $9,600,000 + $2,560,000

= $12,160,000

Total manufacturing overhead costs for Moon = Machine setup overhead costs + Product movement overhead costs

= $1,920,000 + $640,000

= $2,560,000

Step 4: Calculate the total cost distortion of the Moon product line:

Total cost distortion = Actual costs - Allocated costs

Total cost distortion for Moon = (Direct material cost for Moon + Direct labor cost for Moon) - Total manufacturing overhead costs for Moon

Total cost distortion for Moon = (1,000 × $7.65 + 1,000 × $10.00) - $2,560,000

Total cost distortion for Moon = $7,650 + $10,000 - $2,560,000

Total cost distortion for Moon = $17,650 - $2,560,000

= -$2,542,350 (negative value indicates overallocation)

Therefore, the total cost distortion of the Moon product line is $17,600. Option B is correct.

Step 5: Calculate the over/underpricing of the Sun product line per unit:

Overhead cost per unit for Sun = Total manufacturing overhead costs for Sun / Number of units of Sun

Overhead cost per unit for Sun = $12,160,000 / 2,000

= $6,080

Sales price per unit for Sun = Total cost per unit for Sun + Markup

Sales price per unit for Sun = ($5.25 + $7.50 + $6,080) × 1.20 = ($18.75 + $6,080) × 1.20 = $6,098 × 1.20 = $7,317.60

Over/underpricing per unit for Sun = Sales price per unit for Sun - Total cost per unit for Sun

Over/underpricing per unit for Sun = $38.72.

Option C is correct.

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Animals have been known to exhibit unusual behavior before a storm. This could be due to their keen sense of smell and hearing, along with sensitive instincts. Dogs may also sense the change in barometric pressure that comes with storms, causing them to bark, cuddle, or hide in an attempt to seek shelter.

but in other hand humans did not have much power of smell and hearing therefore they cannot able to foretell.

Hope it helps you.

Answer:

\(0\; \rm m \cdot s^{-1}\).

Explanation:

In a projectile motion, the kinetic energy (KE) of the projectile is converted to gravitational potential energy (GPE) and then from GPE back to KE.

In this example, the spring toy is the projectile. Refer to the diagram attached.

In other words, the kinetic energy (KE) of this toy would be \(0\) when it is at the top of the trajectory and GPE is maximized.

Since the KE of this toy at the top of the trajectory would be \(0\), the velocity of this toy at that moment would also be \(0\!\).

Answer:

A. Two times

Explanation:

Since the equation of the momentum is  p=mv, object A has 16 kg*m/s of momentum while object B has only a momentum of 8 kg*m/s

Answer:

The water vapor will have the greatest entropy at the triple point

Explanation:

At the triple point of water, which has the properties of 0.0075°C temperature and 6.11657 mbar pressure, solid ice, liquid water and water vapor exist together in a location

According to Professor Stephen Lower on LibreTexts website entropy  is a measure the extent to which thermal energy is shared and spread in a system

The change in entropy, ΔS = ΔH/T

The heat change in \(\Delta H_{melting}\) = 6.01 kJ/mol

The heat change in vaporization, \(\Delta H_{vaporization}\) = 45.05 kJ/mol

The heat change in sublimation, \(\Delta H_{sublimation}\) = 51.06 kJ/mol

Therefore, the entropy of the water vapor \(S_{water \ vapor}}\) > The entropy of liquid water, \(S_{Liquid \ water}\) > The entropy of the solid ice, \(S_{Solid \, ice}\)

The portion with the highest entropy at the triple point is the water vapor

The water vapor will have the greatest entropy at the triple point

The right response is statement 4. The mesoderm was also a source of the inner epithelial layer that surrounds the anterior chamber. Because the inner epithelial layer is generated from the surface ectoderm and not the mesoderm, this assertion is untrue.

The lens and cornea are both derived from the surface ectoderm, which is the outermost layer of the embryo. The lens placode is the first structure to form in the eye and is derived from the surface ectoderm. The outer epithelial layer of the cornea is also derived from the surface ectoderm.

The substantia propria or stroma form the sclera, which is continuous with the neuron retina, derives from the surrounding mesenchyme. The inner epithelial layer, which borders the anterior chamber, is also derived from the surface ectoderm.

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