A tennis player serves a ball horizontally at a height h = 2.7 m a distance d = 14.9 m from the net. what minimum speed must the ball be served so as to clear the 1.08 m tall net?

Static fiction, A force that holds an object at rest is called static friction.

When an object experiences static friction, the frictional force resists any applied force, causing the object to stay at rest until the static frictional force is removed. The frictional force opposes an object's motion in kinetic friction.

Static friction is a force that maintains an object at rest. Static friction is defined as the resistance one encounters when attempting to move a stationary object across a surface without actually moving their body or the surface they are moving the object across.

Static friction is a type of friction force that acts on the body when there is no relative motion between the object and the surface.

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The mechanical energy of the blocks-spring system remains constant, while the mechanical energy of the blocks-spring-earth system decreases.

What is Energy?

Energy is a fundamental physical property that describes the ability of a system to do work. It can exist in various forms, such as kinetic energy, potential energy, thermal energy, electrical energy, and many others. In general, energy is conserved in a closed system, which means that it cannot be created or destroyed, but only transformed from one form to another.

When the blocks are held at rest, there is no potential energy stored in the spring, so the mechanical energy of the blocks-spring system is entirely kinetic energy, which remains constant throughout the motion. However, during the motion, the blocks lose some mechanical energy to the friction force exerted by the table, causing the mechanical energy of the blocks-spring-earth system to decrease.

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Answer:

168

Explanation:

56 x 3

have a nice day

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Your answer is 0.30 seconds

I'll put my answer in the comments but, part of the question is cut off do you mind putting a more readable and not sideways picture?

The name of the unit of energy that is the amount by which the electric potential energy of an electron changes when it moves through a potential difference of one volt is called an electronvolt (eV).

Electric potential energy is the energy that an electric charge possesses by virtue of its position in an electric field. The electric potential energy of a charge depends on its position relative to other charges in the field and the strength of the field.

An electronvolt is defined as the energy that an electron (or a proton) gains when it moves through a potential difference of one volt. One electronvolt is equal to 1.602 x 10^-19 joules. It is commonly used in atomic and nuclear physics to describe the energies of particles and radiation.

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Answer:

probably by robots

Explanation:

Answer:

they can be studied through telescopes, satellites, and rovers. maybe in the future spaceships

Explanation:

Answer:

Third option: "A nucleus collides with a neutron and splits, releasing energy."

Explanation:

When nucleus that collides with a neutron splits (fission) releases energy in the process. This is a case of fission.

This is how a fission nuclear reactor works.

Answer:

It be C

Explanation:

Right on edg

1.9 kg*m/s

As we know that momentum is directly proportional to Mass and Velocity

Momentum= k*M*V

where k is the proportional constant, which is equal to 1 in this case.

(M*V). And by now if we talk about Unit then Mass has SI Unit as Kg. and Velocity have as m/s

I option 1 we unit as m/s  which simply shows the unit of Velocity. whereas option 2 is 2.4 kg/m which is not true as we already calculated as it must be kgm/s similarly in the case of option 3 2kg/s which again is not exactly the same SI unit of what we calculated before using equating the equation.

we can calculate the Kinetic energy by multiplying moment by Velocity and dividing 2.

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The circuit shows three resistors connected in series is the letter B because he elements are connected on the same wire and there is only one path for the electric current to flow.

The main difference between series and parallel circuit is the way voltage and current are presented. The voltage will be the same at all points in the parallel circuit and the current will vary. In series circuit, it is the voltage that can be different, while the electric current is the same.

In a series electric circuit, the elements are connected on the same wire and there is only one path for the electric current to flow. For this reason, the electric current is the same in all elements of the circuit.

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Answer:

hydrochlorine +12÷B to the power of 4 -× y reapeated zminus 2 to the power of 9

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We can solve this problem using the heat transfer equation:

\({\hookrightarrow}\)Q = \({\frac{kAΔT}{L}}\)

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Let's assume that the cross-sectional area of the composite rod is constant, so we can write:

Q = k1A1ΔT1/L1+ k2A2ΔT/L2

where k1 and k2 are the thermal conductivities of brass and aluminum, A1 and A2 are the cross-sectional areas of brass and aluminum, ΔT1 is the temperature difference between the hot end of brass and the junction, and ΔT2 is the temperature difference between the junction and the cold end of aluminum, and L1 and L2 are the lengths of brass and aluminum.

______________________________________

We know that the force of arms is at 120°C and the free end of brass is maintained at 20°C. Therefore, ΔT1 = 120°C - 20°C = 100°C and ΔT2 = 0°C - 120°C = -120°C.

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We also know that the length of brass is 40 cm and the length of aluminum is 60 cm. Therefore, L1 = 40 cm and L2 = 60 cm.

______________________________________

We are given that the thermal conductivity of aluminum is 205 W/mK and the thermal conductivity of brass is 110 W/mK. We are also given that the density of brass is double that of aluminum. Therefore, the cross-sectional area of brass is half that of aluminum, or A1 = A2/2.

______________________________________

Substituting these values into the heat transfer equation, we get:

Q = (110)(A2/2)(100)(40) + (205)(A2)(-120)/(60)

Simplifying, we get:

Q = -2.75A2

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We know that the heat transferred is equal to zero at the junction, so we can write:

0 = (110)(A2/2)(100)/(40) + (205)(A2)(-120)/(60)

Simplifying, we get:

0 = -2.75A2

Therefore, A2 = 0.

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This means that the cross-sectional area of aluminum is zero, which is not possible. Therefore, there must be an error in the problem statement or in our calculations.

Using the concept of Mechanical-wave, we got 0.173m  as the wavelength of the second string.

A mechanical wave is actually a wave that is not capable of transmitting its energy through the vacuum. Mechanical waves which require a medium in order to transport their energy from one point to another point. The sound wave is an example of a mechanical wave. Sound waves are actually incapable of traveling through a vacuum.

We are given a speed=260m/s and wavelength=1.8m of the first string

we know that,

speed = wavelength × frequency

So putting the value in the above formula

frequency = 260 / 1.8  ......(1)equation

Similarly, for the second string,

we are given a speed=25m/s and frequency from (1) equation

wavelength = (25×1.8)/260

wavelength = 0.173m

Hence, the wavelength of the mechanical wave in the second string is 0.173m.

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Explanation:

A the magnetic fields between the north poles repel each other

Explanation:

the correct answer is A

hpoe it help u

Answer:

yes done first thing tomorrow

Answer:

convex mirror is used in vehicle to provide a wide angle view

According to Piaget's theory of cognitive development, adaptation first occurs during the sensorimotor stage, specifically in the substage called the "circular reactions" stage.

This stage occurs between the ages of 8 to 12 months. During this period, infants engage in repetitive actions to explore and interact with their environment.

They begin to adapt their behaviors based on the responses they receive from their actions. The circular reactions involve repetitive behaviors that serve a purpose, such as shaking a rattle to hear the sound.

Through these actions, infants start to develop a basic understanding of cause and effect relationships and adapt their behaviors to achieve desired outcomes.

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The voltage waveform is more sinusoidal than the current waveform.

This is because the voltage source is assumed to be an ideal source, which means that the voltage is supplied without loss or fluctuation while the current waveform is distorted due to the loads present in the circuit. When a voltage waveform is applied to a circuit with inductance and capacitance, the resulting current waveform will be distorted and will not be sinusoidal. The current waveform is affected by the presence of capacitance and inductance in the circuit, which cause the current to lag behind the voltage. The current waveform becomes more distorted as the load resistance increases.

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Answer:

b

Explanation:

Answer:

8360N

Explanation:

F = ma

= 2200kg × 3.8 m/s²

= 8360 N

Answer:

D. Weakest, Attractive

Explanation:

Gravitational Force is the weakest force out of the four forces, and Gravity attracts objects towards another so the answer has to be D.

Got this correct on Edge 2021.

Hope this helped!

Answer:

D

Explanation:

EDGE 2021

Answer:

Explanation:

We shall find first the distance where electric field is E/4 .

Let the charge be Q and distance be d where electric field is E . From the coulomb's Law

E = k Q / d²

Let distance be d₁ where field is E/4

E/4 = kQ / d₁²

Dividing the two equation

4 = d₁² / d²

d₁ = 2d

We shall have to find Potential at d₁ which is equal to 2 d .

Potential at d₁

V = k Q / 2d

= kQ d / 2d²

= E d / 2 . where d is distance of the point where field is E .

Water: The motion of the water molecules initially decreased when the ice cubes were added to the water bottle, which caused the water to become cold.

As time passed during the hike, the motion of the water molecules may have increased due to exposure to higher temperatures and agitation during transport.

Ice: The ice cubes initially had a low motion of molecules due to being frozen solid. As time passed during the hike and the ice cubes were exposed to higher temperatures, their molecules began to gain more motion, causing the ice to melt.

Beans: The motion of the molecules in the beans increased as the pot was placed over the fire and heated. This caused the beans to become hot and cooked.

Hot dog: The motion of the molecules in the hot dog increased as it was heated over the fire. This caused the hot dog to become hot and cooked.

Lastly, Hot Chocolate: The motion of the molecules in the hot chocolate initially decreased as it cooled to room temperature. When Carly drank the cold hot chocolate, the motion of the molecules in her mouth may have increased due to the temperature difference, providing a warming sensation.

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Given that the magnetic field is perpendicular to both the electrostatic potential and the electromagnetic wave, its strength will be equal to E/c, where c is the speed of light.

Wire coils with electricity running through them are used to create electromagnets. The coils of copper in an electromagnet behave like a magnet when an electric current flows through them because moving charges produce magnetic fields.

And we refer to these waves as "electromagnetic" because they include magnetic fields in addition to electric fields. We also refer to them as "waves" because, like all other waves that we have seen, they travel outward in accordance with wave equations.

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Answer:

Due to the resistance of air, a drag force acts on a falling body (parachute) to slow down its motion. Without air resistance, or drag, objects would continue to increase speed until they hit the ground. The larger the object, the greater its air resistance. Parachutes use a large canopy to increase air resistance. Also, Once the parachute is opened, the air resistance overwhelms the downward force of gravity. The net force and the acceleration on the falling skydiver is upward. An upward net force on a downward falling object would cause that object to slow down. The skydiver thus slows down. Sorry if not helpful.

Answer:

b

Explanation:

Answer:

B

Explanation:

Answer:

18.15m

Explanation:

Speed * Time = Distance

5.5 * 3.3 = 18.15m

The distance traveled by Robin is equal to 18.15 m with an average speed of 5.5 m/s for 3.3s.

The average speed can be explained as the total distance covered by the object in a definite time. The average speed can be considered a scalar quantity as it exhibits magnitude and no direction.

The average speed of a physical system can be determined from the ratio of the total distance traveled by the system to the time taken to cover that distance.

The average speed equation of a physical system can be written as follows:

Average speed =  Total distance/total time taken

Given, the average speed of the Roin, = 5.5 m/s

The time is taken by Robin for jogging = 3.3 s

The average speed of the Robin can be determined as:

Average spped = Distance/ time

5.5 = Distance/3.3

Distance traveled by Robin = 5.5 × 3.3 = 18.15 m

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An electron moving in a uniform magnetic field experiences the maximum magnetic force when the angle between the direction of the electron's motion and the direction of the magnetic field is 90°. So, option C) is correct.

The correct answer is C) 90°. This is because the magnetic force on a charged particle, say, an electron, moving in a magnetic field is given by F = qvBsinθ, where q is the charge of the particle, v is its velocity, B is the magnetic field strength, and θ is the angle between the velocity vector and the magnetic field vector.

When θ = 90°, sinθ = 1, and therefore the magnetic force is at its maximum value. When θ = 0° or 180°, sinθ = 0, and the magnetic force is zero.

When θ = 45°, sinθ is less than 1, so the magnetic force is less than its maximum value.

The magnetic force acting on a moving charged particle is given by F = q(v × B), where F is the magnetic force, q is the charge of the particle, v is its velocity, and B is the magnetic field.

The cross product (v × B) in the formula implies that the magnetic force is at its maximum when the angle between the velocity and the magnetic field is 90 degrees.

So, option C) is correct.

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