Fred is conducting a controlled experiment to test whether using a grow light at night will help a tomato plant grow faster. Below are the steps to Fred's experiment: Plant tomato plants in two separate, but identical, flowerpots. Place the flowerpots in the same area outside during the day. At night, bring both flower pots inside and place one in the dark and one under a grow light. Give the plants the same amount of food and water each week. Measure the growth of the plants. Draw conclusions based on the data collected. Which of the following variables must Fred hold constant in this experiment?

Answer:

A car engine has more power than a horse because a car engine does the same amount of work in time. Yasmin and Raj each had 10 boxes of equal weight to stack next to each other on the same shelf, at the same height and in the same arrangement. Yasmin completed the task in 2 minutes, while Raj took 3 minutes to stack his boxes. Raj applied less power than Yasmin because his stacking took more time to do the same amount of work.

Explanation:

A car engine has more power than a horse because a car engine does the same amount of work in less time. Raj applied less power than Yasmin because his stacking took more time to do the same amount of work.

The quantity of energy moved or converted per unit of time is known as power in physics. The watt, or one joule per second, is the unit of power in the International System of Units. Power is also referred to as activity in ancient writings. A scalar quantity is power.

Energy divided by time represents the dimension of power. The watt (W), which equates to one joule per second, is the unit of power in the International System of Units (SI).

Another popular unit of measurement is horsepower (hp), which is equivalent to a horse's power; one mechanical horsepower is equal to around 745.7 watts.

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Answer:

too much :(

Explanation:

\overline{a} = \frac{v - v_0}{t} = \frac{\Delta v}{\Delta t}

\overline{a} = average acceleration

v = final velocity

v_0 = starting velocity

t = elapsed time

Answer:

a = Δv⁄t.

Explanation:

Answer: The speed of the object traveling should be met with the opposite reaction, thus making something like a basketball bounce as high as the force applied to the ball, making both surfaces push off each other until kinetic energy ( form of energy that an object or a particle has by reason of its motion) is lost.

Answer:

Yuri A. Gagarin

Explanation:

Answer: Yuri A. Gagarin

Explanation:

Sputnik 1 was the first human-made object to achieve orbital spaceflight. It was launched on 4 October 1957 by the Soviet Union. Vostok 1, launched by the Soviet Union on 12 April 1961, carrying Yuri Gagarin, was the first successful human spaceflight to reach Earth orbit.

He made a 108-minute orbital flight in his Vostok 1 spacecraft. He was a Soviet pilot and cosmonaut who became the first human to journey into outer space. He was 27 years old at the time of the flight.

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Answer:

The answer is 349 m/s

1.8 is the mechanical advantage of the lever.

The theoretical mechanical advantage of a system is the ratio of the force that performs the useful work to the force applied, assuming there is no friction in the system.

The advantage gained by the use of a mechanism in transmitting force specifically the ratio of the force that performs the useful work of a machine to the force that is applied to the machine.

Mechanical advantage is given by the ratio of the load lifted to the force applied to lift the load.

In this case, Mechanical advantage=L/E where L is the load and E is the effort applied.

Mechanical advantage= 90/50 =1.8

Question-you use a lever to lift a heavy tree branch. you apply a force of 50 n and the lever lifts the branch with a force of 90 n. what is the mechanical advantage of the lever?

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To find the focal length of a convex lens, we can use the formula:
1/f = 1/di + 1/do

Where f is the focal length, di is the distance of the image from the lens, and do is the distance of the object from the lens.

We are given that the student is 2.50m away from the lens, so do = 2.50m. We are also given that the image is 1.80m from the lens, so di = 1.80m.

Plugging these values into the formula, we get:
1/f = 1/1.80 + 1/2.50

Simplifying this equation, we get:
1/f = 0.5556

Multiplying both sides by f, we get:
f = 1.80 / 0.5556

Solving for f, we get:
f ≈ 3.24 meters

Therefore, the focal length of the convex lens is approximately 3.24 meters.

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A convex lens is 1.80 meters from a student who is 2.50 meters distant, and its focal length is 1.04 meters.

To solve this problem, we can use the lens equation:

1/f = 1/do + 1/di

where f is the focal length of the lens, do is the object distance (distance of the object from the lens), and di is the image distance (distance of the image from the lens).

In this problem, the object distance is do = 2.50 m and the image distance is di = 1.80 m. We can plug these values into the lens equation and solve for the focal length:

1/f = 1/do + 1/di

1/f = 1/2.50 + 1/1.80

1/f = 0.4 + 0.56

1/f = 0.96

f = 1/0.96

f ≈ 1.04 meters

Therefore, the focal length of the convex lens is approximately 1.04 meters.

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Answer:

20.4081633 kilograms.

Explanation:

To find an object's mass using its weight, the formula is Mass equals Weight divided by the Acceleration of Gravity (M = W ÷ G). Convert the weight measured in pounds to the equivalent in Newtons.

Divide the weight in Newtons by the acceleration of gravity to determine the mass of an object measured in Kilograms. On Earth, gravity accelerates at 9.8 meters per second squared (9.8 m/s2). For example, to determine the mass of an object weighing 667 Newtons, calculate as follows:

200 Newtons ÷ 9.8 m/s2 = 20.4081633 kilograms.

The given statement is true. A sight glass is a transparent or translucent window installed in a pipeline or vessel to visually inspect the presence, level, and characteristics of a fluid.

Explanation: When a sight glass is full of vapor, it may appear similar to when it is filled with liquid. This is because both vapor and certain liquids can be transparent or have similar optical properties. In such cases, it can be challenging to distinguish between a sight glass filled with vapor and one filled with liquid by visual observation alone.

To accurately determine whether a sight glass is filled with vapor or liquid, additional information or techniques may be required.

For example, measuring the temperature or pressure of the system, observing any condensation or evaporation occurring in the sight glass, or employing other complementary instruments or indicators can help differentiate between vapor and liquid contents.

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Answer:

if there isn't a shorting mechanism, the whole sets will be blown out several lamps and then shortened, the overall resistance of the remaining operating lamps will be decreased resulting in an increased working current that is adequate to blast the fuse

The functioning of a radio obeys the energy conservation principle, the energy is conserved throughout the process of transmitting sound waves.

Radio is a device that receives and broadcasts electromagnetic waves in the radio frequency (RF) range. The energy conservation principle states that energy can neither be created nor destroyed, but it can be converted from one form to another. This principle applies to the functioning of a radio, where the energy is conserved throughout the process.

When a radio receives a signal, it converts the electromagnetic wave energy into an electrical signal using an antenna. The electrical signal is then amplified and demodulated to extract the original audio signal. The audio signal is then amplified again and played through a speaker, where the electrical energy is converted into sound energy. The energy that was originally present in the electromagnetic wave is conserved throughout this process and is not lost.

Similarly, when a radio broadcasts a signal, the audio signal is first converted into an electrical signal, which is then amplified and used to modulate an RF carrier wave. The modulated RF wave is then transmitted through an antenna as electromagnetic waves. The electrical energy from the audio signal is conserved and transformed into electromagnetic energy in the transmitted signal.

In both cases, the energy conservation principle is applied, and the energy is conserved throughout the process. Therefore, the functioning of a radio obeys the energy conservation principle.

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Answer:

\(R=9\ \Omega\)

Explanation:

Given that,

Current, I = 2 A

Voltage across the resistor, V = 18 V

We need to find the value of resistance of the resistor. Let the resistance be R. We can find it using Ohm's law i.e.

V = IR

Where

R is the resistance of the resistor

\(R=\dfrac{V}{I}\\\\R=\dfrac{18}{2}\\\\R=9\ \Omega\)

So, the resistance of the resistor is equal to \(9\ \Omega\).

Answer:

Therefore the laws of physics are the same for the two observers, whoever is standing under the tree observes a vertical movement of free fall.

The person who is running observes a movement parabolic

Explanation:

To answer this question we must establish that as two people have inertial reference systems from which to make their observations, the inertial systems are systems with constant velocity.

Therefore the laws of physics are the same for the two observers, whoever is standing under the tree observes a vertical movement of free fall.

The person who is running observes a movement parabolic composed of the vertical movement and horizontal movement ladies go running, therefore it is a parabolic movement

Traslate

Para responder eta pregunta debemos establecer que as dos personas tiene sistema de referencia inerciales de des donde realizar sus observación, los sistema inerciales son sistema con velocidad constante.

Por lo tanto las leyes de la fisica son la misma para los dos observadores, el que esta parado bajo el árbol observa un movimiento vertical de caída libre.

La persona que va corriendo observa un movimiento compuesto por el movimiento vertical y damas movimiento horizontal ir corriendo, por lo cual es un movimiento parabólico

A tool which is excellent for examining light from very faint distant stars include the following: D. camera photographing through a telescope.

Generally speaking, there are four (4) main modern instruments (tools) that are used by astronomers in order to conduct research on astronomical (celestial) objects and these include the following:

According to astronomy, camera photographing through a telescope can be defined as an instrument (tool) that is designed and developed for the examination of light that are transmitted from very faint distant stars.

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Answer:

Pounds

Explanation:

Answer:

E-Community

Explanation:

edge 2021

Answer:

The answer would be option E- community

Explanation:

Hope this helped :)

edg 2022

Answer: rarefaction

Explanation: correct answer on a p e x

Rarefaction term describes an area of low density in a longitudinal wave.

Wave is a disturbance in a medium that carries energy as well as momentum . wave is characterized by amplitude, wavelength and phase. Amplitude is the greatest distance that the particles are vibrating. especially a sound or radio wave, moves up and down. Amplitude is a measure of loudness of a sound wave. More amplitude means more loud is the sound wave.

Wavelength is the distance between two points on the wave which are in same phase. Phase is the position of a wave at a point at time t on a waveform.

There are two types of the wave longitudinal wave and transverse wave. Longitudinal wave : in which, vibration of the medium (particle) is parallel to propagation of the wave. Sound wave is a longitudinal wave. Transverse wave : in which, vibration of the medium (particle) is perpendicular to propagation of the wave. Light wave is a transverse in nature wave.  

In Longitudinal wave, wave carries energy and momentum with compression and rarefaction. Compression is region of high density, in this region particles of the medium is compressed. rarefaction is region of expansion and it is low density region of longitudinal wave.

Hence option C is correct.

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99.16 Newtons is the new force of attraction between the particles.

The forces that hold atoms together to create molecules and solids are referred to as chemical bonds. The attraction between the electrons of one atom and the nuclei of another atom as a result of this electric force is what is known as a chemical bond.

\(F = (kq1q2)/r^2\)

\(9,916 = (kq1q2)/r^2\)

\(F = (k*(q1/5)*(q2/5))/(2r)^2\)

\(F = (1/100)((kq1*q2)/(r^2))\)

So, the new force of attraction is:

\(F = (1/100)*9,916 = 99.16\)Newtons (rounded to 4 decimal places)

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If current doubles, charge flow doubles. Ohm's law states that current (I) is proportional to charge (Q) over time. When current doubles, charge also doubles.

2. If current doubles, time halves for same charge flow.

3. If the current in a circuit is switched on for twice as long, the total charge that flows through the circuit doubles.

The principle behind this is Ohm's law, wherein the current (I) that runs through a circuit is proportionate to the amount of charge (Q) that passes through the circuit in a given period. As the present is multiplied by two, correspondingly the quantity of charge also increases by two.

If the electric current is increased by two times its original value, the duration required for the identical quantity of charge to pass through is reduced by half. The reason for this is that the equation Q = I * t reflects the correlation among charge (Q), current (I), and time (t).

If the duration of the current in a circuit is doubled, then the amount of charge that passes through the circuit also doubles. The reason behind this is that the correlation linking charge (Q), current (I), and time (t) is defined by the formula Q = I * t.

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The integral of 1/(1 + x²) is (1/2)ln|1 + x²| + C where C is the constant of integration.

Integration is a mathematical process of finding the antiderivative of a function. To integrate the given expression 1/(1 + x²), we will use the substitution method.

Let u = 1 + x², du/dx = 2x dx, then dx = du/2x and the integral becomes:

∫1/(1 + x²) dx = ∫1/u * (1/2x) du= (1/2)∫1/u du

The antiderivative of 1/u is ln|u| + C, where C is the constant of integration.

Therefore, the final solution of the integral is (1/2)ln|1 + x²| + C.

Let us work through the steps:

Step 1:Let u = 1 + x² and then differentiate both sides with respect to x to obtain du/dx. du/dx = 2x

Substitute 2x dx = du into the integral ∫1/(1 + x²) dx to get the integral in terms of u:∫1/u * (1/2x) du = (1/2) ∫1/u du

Step 2:Calculate the antiderivative of 1/u, which is ln|u|. Thus, the final solution is (1/2)ln|1 + x²| + C, where C is the constant of integration. The constant C will vary depending on the initial conditions of the problem.

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The power gain when the gain falls by 3 dB is approximately 300.7 mW, which is closest to option D: 244.2 mW.

The power gain of an amplifier can be calculated using the formula:

Power Gain (dB) = 10 * log10(Pout / Pin)

where Pout is the output power and Pin is the input power. In this case, the midrange gain of the amplifier is given as 600 mW.

To calculate the power gain when the gain falls by 3 dB, we need to find the new output power. Since the gain is decreasing, the new output power will be lower than the initial power.

First, we convert the midrange gain from milliwatts to watts:

Midrange Gain = 600 mW = 0.6 W

Next, we use the formula:

Pout / Pin = 10^(Power Gain / 10)

Since the gain falls by 3 dB, the new power gain is:

Power Gain = -3 dB

Now we substitute the values into the formula:

Pout / Pin = 10^(-3 / 10)

Pout / Pin = 10^(-0.3)

Pout / Pin = 0.5012

To find the new output power (Pout), we multiply the input power (Pin) by the ratio:

Pout = Pin * 0.5012

Pout = 0.6 W * 0.5012

Pout = 0.3007 W

Finally, we convert the output power back to milliwatts:

Pout = 0.3007 W = 300.7 mW

Therefore, the power gain when the gain falls by 3 dB is approximately 300.7 mW, which is closest to option D: 244.2 mW.

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Rowers typically have the same number of paddles on each side of the boat because it provides balance and symmetry in rowing. The correct option is (a) It provides balance and symmetry in rowing.

Balance and symmetry are key components of effective rowing. When all rowers use the same number of paddles on each side of the boat, they create an evenly distributed power source that helps keep the vessel stable and on course. To maintain the balance and symmetry of the boat while rowing, the number of paddles on each side must be the same.

As a result, all rowers need to be coordinated and work together to ensure that their oars are in sync with one another. They should all have the same posture, the same rhythm, and the same intensity of strokes to ensure that they are not working against one another and instead, are working together to power the boat as efficiently as possible.In conclusion, rowers typically have the same number of paddles on each side of the boat to provide balance and symmetry in rowing.

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Answer:Fricition

Explanation: It is fricition in the net force

A car is speeding up with a force of 120 mph and heading east. The force of friction acts against the car with a force of 80 N westward, and the net force acting on the car is 40 N eastward, which means the car is accelerating eastward with a force of 40 N.

To calculate the net force acting on the car, one needs to consider the direction and magnitude of the forces acting on it. A force of 120 N to the east is acting to accelerate the car in that direction, and a force of 80 N to the west is acting to oppose the motion of the car.

Net force = force of acceleration -force of friction.

Net force = 120 N east- 80 N west.

Net force = 40 N East

Hence, the net force acting on the car is 40 N eastward, which means the car is accelerating eastward with a force of 40 N.

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It takes 3.6 seconds for the keys to hit the ground below. To solve this problem, we need to use the equation for the vertical displacement of an object in free fall,

y = y0 + v0y*t + 0.5*g*t^2
where y is the final vertical position, y0 is the initial vertical position, v0y is the initial vertical velocity, g is the acceleration due to gravity, and t is the time.

In this case, we want to find the time it takes for the keys to hit the ground, so y = 0. The initial vertical position is 64 m, the initial vertical velocity is 0 (since the keys were thrown horizontally), and the acceleration due to gravity is -9.8 m/s^2.

Plugging these values into the equation, we get:
0 = 64 + 0*t + 0.5*(-9.8)*t^2

Simplifying and rearranging, we get:
4.9*t^2 = 64
t^2 = 64/4.9
t = sqrt(64/4.9)

So the time it takes for the keys to hit the ground is:
t = 3.6 seconds

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The fish appears to be located 37.6 cm below the surface of the pond when viewed from directly above.The correct answer is: O 37.6 cm below the surface of the pond.

This is because when light travels from water (with an index of refraction of 1.33) to air (with an index of refraction of 1.00), it undergoes refraction. This means that the light bends as it passes through the surface, which causes objects to appear shifted from their actual position.

In this case, the fish is actually located 50.0 cm below the surface of the pond. However, when the light from the fish enters the air above the pond, it bends away from the normal (a line perpendicular to the surface of the water), causing the fish to appear higher up than it actually is. Using the formula for calculating the apparent depth of an object underwater:

apparent depth = real depth / index of refraction

We can calculate the apparent depth of the fish:

apparent depth = 50.0 cm / 1.33 = 37.6 cm

Therefore, the fish appears to be located 37.6 cm below the surface of the pond when viewed from directly above.

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Following are the values:

Weight of the box: 147 N

Normal force: 127.05 N

Maximum static friction force: 40.66 N

Net force on the box: 57.83 N

Acceleration of the box: 3.855 m/\(s^2\)

To solve the problem, we can use the principles of Newtonian mechanics and consider the forces acting on the box.

1. Determine the gravitational force:

The weight of the box can be calculated as follows:

Weight = mass * acceleration due to gravity

Weight = 15 kg * 9.8 m/\(s^2\)

Weight = 147 N

2. Determine the normal force:

The normal force is the force exerted by the ramp perpendicular to its surface. It can be calculated using trigonometry:

Normal force = Weight * cos(angle of the ramp)

Normal force = 147 N * cos(30°)

Normal force = 127.05 N

3. Determine the maximum static friction force:

The maximum static friction force is given by:

Maximum static friction force = coefficient of static friction * normal force

Maximum static friction force = 0.32 * 127.05 N

Maximum static friction force = 40.66 N

4. Determine the net force on the box:

The net force acting on the box can be calculated by subtracting the friction force from the gravitational force:

Net force = Weight * sin(angle of the ramp) - friction force

Net force = 147 N * sin(30°) - 40.66 N

Net force = 98.49 N - 40.66 N

Net force = 57.83 N

5. Determine the acceleration of the box:

Using Newton's second law (F = ma), we can solve for the acceleration:

Net force = mass * acceleration

57.83 N = 15 kg * acceleration

acceleration = 57.83 N / 15 kg

acceleration = 3.855 m/\(s^2\)

Therefore, the box will experience an acceleration of 3.855 m/\(s^2\) while moving up the ramp.

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When a ball is launched or thrown, its initial velocity is the speed and direction at which it moves. The ball's exit velocity from the hand or launcher can be measured to ascertain the beginning velocity.

The vertical component of the ball's initial velocity can be found using the formula Vf = Vi + at, where Vf is the final velocity (which in this case is 0 m/s as the ball reaches its maximum height), Vi is the initial velocity, a is the acceleration due to gravity (-9.8 m/s^2), and t is the time it takes for the ball to reach its maximum height.

To find the time, we can use the formula for vertical displacement:

Δy = Vi*t + 0.5*a*t^2

Since the ball starts and ends at the same height, Δy = 0. Solving for t:

0 = Vi*t + 0.5*(-9.8)*t^2

0 = t(Vi - 4.9t)

t = 0 (which means the ball hasn't started falling yet) or t = Vi/4.9

Using Vi = 50 m/s and plugging in t:

Vf = Vi + at

Vf = 50 + (-9.8)*(50/4.9)

Vf = 43.3 m/s

Therefore, the vertical component of the ball's initial velocity is +43.3 m/s (upward), so the correct answer is +43.3 m/s.

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Answer:

D. Pearl Harbor

Explanation: