Amy uses 20N of force to push a lawn mower 10 meters. How much work does she do? *
200 J
250 J
220 J

Ohm's law states that the electrical current (I) flowing in an circuit is proportional to the voltage (V) and inversely proportional to the resistance (R). Therefore, if the voltage is increased, the current will increase provided the resistance of the circuit does not change.

Changes in voltage and resistance directly impact electrical current due to Ohm's Law. Increasing voltage increases current if resistance is kept constant. Conversely, increasing resistance decreases current if voltage is kept constant.

The effect of changing voltage and resistance on electric current can be explained using Ohm's Law, which states that the current through a conductor between two points is directly proportional to the voltage across the two points, and inversely proportional to the resistance between them. This can be expressed by the formula I = V/R, where I is the current, V is the voltage, and R is the resistance.

When voltage increases, the current will also increase if the resistance is kept constant. Similarly, increasing resistance will decrease the current if the voltage is kept constant. For example, when the voltage is doubled to a 25-W bulb, its power nearly quadruples to about 100 W, burning it out. If the bulb's resistance remained constant, its power would be exactly 100 W, but at the higher temperature its resistance is higher, too.

Therefore, voltage and resistance are intricately linked to the electric current in a circuit. It's always critical in electrical circuits to have a proper balance of voltage, resistance, and current to prevent any malfunctions or damage to electrical components.

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B. 2HCl + Mg(OH)2 → 2H2O + MgCl2

Answer:

It means that when water has the thermal capacity equal to iron, that thermal capacity is greater than that of copper.

Explanation:

The water equivalence of a body is the body of water that has the same thermal capacity as the body, that is, it is the body of water that, receiving the same amount of heat, undergoes the same temperature variation as the body. Thus, we can say that water equivalent to iron is greater than copper means that when water has the same thermal capacity as iron, that thermal capacity is greater than that of copper.

A battery operated lamp because battery's don't use your own electricity. They come with electricity already.

a battery operated lamp

Answer:

It might be the sum is the same

Explanation:

Correct me if i am wrong but there is no friction so that means there would not be anything slowing down the ball, therefore the ball wouldn't change or the energy wouldn't change because the ball would never stop.

The sum of the ball’s kinetic energy and potential energy remains the same as the ball rolls from point A to point E ( if there’s no friction between the ball and the ground).

Answer: Option C

Explanation:

Based on the law of mechanical energy's conservation, the sum of both kinetic and potential energies i.e. the total amount of mechanical energy remain conserved even in the absence of dissipative forces (friction or air resistance) in a bound system.

                    E = Kinetic + Potential

The kinetic energy is high when ball goes downward but potential energy decreases and reverse happens when ball goes up. But in these case, the sum energy would be constant one.

The speed of sound in air is directly proportional to the temperature of the air. This is because increasing the temperature reduces the air's compressibility, making it easier for sound to travel through.

The true statement is B. The speed of sound in air is directly proportional to the temperature of the air.

The speed of sound in any medium is determined by a mixture of the medium's density and rigidity, which, in the case of gases like air, is translated as compressibility. In other words, the speed of sound is higher in more rigid (or less compressible) mediums. Air is easily compressible, so the speed of sound is relatively low in it.

However, temperature impacts this as well. As the temperature rises, the particles in the air move more quickly, and so the density of the air decreases - the gas becomes less compressible. With increased temperature, sound finds it easier to travel through the medium, and so the speed of sound increases. Thus, the speed of sound in air is directly proportional to the temperature of the air because an increase in one corresponds to an increase in the other. For example, sound travels at 331 m/s in the air at 0 °C, but the speed increases to 346 m/s once the temperature hits room level (around 20 °C).

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C. the atlantic tectonic plate does NOT exist

The C. Atlantic Plate is not a tectonic plate.

All continents and oceans on Earth rest on tectonic plates which form a part of the Earth's crust. These plates are constantly in motion because they are floating on the mantle.

There are several plates on Earth but none of them are called the Atlantic plate.

The Atlantic ocean rests on:

In conclusion we can therefore say that there is no Atlantic plate.

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92 percent because you multiply it by 2

I'm pretty sure that would be a A.

Answer:

2 m/s

Explanation:

The impulse exerted by the obstacle on the block is equal to the change in momentum of the block:

[tex]I=\Delta p = -6 Ns[/tex]

where we put a negative sign because the direction of the impulse is south, which is opposite to the initial direction of travelling of the block (north).

The change in momentum is also equal to

[tex]\Delta p = m (v-u)[/tex]

where

m = 3 kg is the mass of the block

v is the final velocity

u = +4 m/s is the initial velocity

Solving the equation for v, we find the final velocity of the block:

[tex]v=u+\frac{\Delta p}{m}=+4 m/s+\frac{-6 Ns}{3 kg}=+2 m/s[/tex]

and the positive sign means the direction is still north.

The technology that uses electromagnetic radiation with the longest wavelength is the Wireless communications transmitter, as it uses radio waves, which have the longest wavelengths in the electromagnetic spectrum.

The question refers to which technology uses electromagnetic radiation with the longest wavelength. From the given options, wireless communications transmitters typically use radio waves, compact fluorescent light bulbs emit light mostly in the visible spectrum, microwave industrial drying equipment uses microwaves, and infrared sensors on a DVD player use infrared radiation.

Based on the electromagnetic spectrum, radio waves have the longest wavelength, followed by microwaves, then infrared, and finally visible light which is emitted by the compact fluorescent bulbs. Therefore, the technology that uses the electromagnetic radiation with the longest wavelength amongst the choices provided is A. Wireless communications transmitter.

Answer:

w = 73 N

Explanation:

Since the box is held by the ropes it means that the resulting tension is equal to the weight of the box

T_res = w

Now, the resulting tension is a combination of the tension of each rope.

Since we want to find the vertical component we must multiply by the cosine of 30 degrees the value of T

T_res =  T*cos(30) + T*cos(30)

T_res = 2*(42 N)*(0.866)

T_res = 72.746 N

T_res = w = 72.746 N

The acceleration of the 20-kg rock is, also, a. Hope this helps.

The acceleration of the 20-kg rock will be the same as the 10-kg rock in an ideal condition. This is due to Galileo's principle of equivalence which states that the gravity does not depend on the mass of the falling object.

In Physics, the rule referred to as Galileo's principle of equivalence states that in the vicinity of Earth the acceleration of a falling object is independent of its mass. This means that all objects fall at the same rate given that they are in a vacuum where no factors like air resistance are present.

So, if a 10-kg rock falls with an acceleration a, then the 20-kg rock, when dropped from the same height, will also fall with the same_ acceleration__. The gravity does not depend on the mass of the falling object. So if by 'a' we mean the acceleration due to gravity, then both rocks fall with the same acceleration 'a' irrespective of their weights. The only difference in real-world scenarios is due to elements such as air resistance.

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Answer:

1.88 N

Explanation:

Given in the question,

force applied by Jason  = 4N

angle which it make with the ground = 62°

The angle made with the x-axis is cosine of the angle 62°

Thus, the horizontal component of the force is equal to

F = 4.00(cos62⁰) = 1.88 N

              /

            /

4N     /

       /

     / 62°

  Ф ------------------------

by using trigonometry identity

cosФ = adjacent / hypotenuse

horizontal force = hypotenuse (cos(Ф))

horizontal force = 4cos(62)

Answer:

The gravitational attraction of the Sun is what holds the planets in their elliptical orbits. So to explain this the mass effects the motion of the planets because the strength of gravitational force depends of the mass.

Explanation:

The mass of a planet affects the motion of the planet around the sun because mass is directly proportional to the gravitational force.

The force of attraction felt by a person at the center of a planet or Earth is called as the gravity.

Force of gravity between Sun and planet while moving in orbit is given by

F = GMm/R²

where M is the mass of Sun, m is the mass of any planet, G = gravitational constant = 6.67 x 10⁻¹¹ N.m²/kg² and R is the distance between two masses.

The weight of a person or object is determined by gravity. The gravitational attraction of the Sun holds the planets to move in their elliptical orbits.

Thus, the mass effects the motion of the planets because the strength of gravitational force depends of the mass of planet

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Hang time = 3.0 s

Range  = 65.06 m

Maximum Height = 11.05 m

Hang time is given by the formula;

T = 2vₒsinθ/g

Thus;

T = 2*(26.2 )sin34.2 / 9.81

    = 3.0 s  

Range is given by the formula;

R = vₒ²sin2θ/g

      = 26.2²sin(2*34.2) /9.81

      = 65.06 m  

Max height is given by the formula;

H = vₒ²sin²θ/2g

Thus;

H= 26.2²sin²34.2 /(2*9.81)

  = 11.05 m

Answer:

Gravitational force and magnetic force. The other forces on the list require contact (tension requires contact with the rope and friction requires the object to be in contact with the surface)

Explanation:

Answer:

gravitational force between the earth and an object and magnetic force between two magnets

Explanation:

gravitational force between the earth and an object and magnetic force between two magnets are forces that does not require contact between objects in order to exert a push or pull.

The earth and the object are never in contact with each other but there is a force of gravitation existing between them. There is force of attraction between the masses of the earth and the masses according to gravitational law are separated by a distance.

Force between two magnets may or maynot exert push or pull. They only attract when the poles of the magnets are unlike poles (different). There is force of repulsion between them if like poles of the magnet come together according to the law of magnetism. Magnets in magnetic field will always experience force even if at a distance from each other in the field hence the reason for the selected options

ribosomes

an animal cell with a nucleus

animal

Answer:

4) Chloroplasts, 5) An animal cell with a nucleus, 6) many-celled organisms.

Explanation:

4) Chloroplasts are organelles present in eukariotic cells that produce food with the help of sunlight via photosynthesis.

5) Every cell has a nucleus. Bacteriae are prokariotic cells, while vegetal and animal cells are eukariotic cells, in which cytoplasm is exclusive for organells. Hence, the right answer is: An animal cell with a nucleus.

6) Specialized cells are cells that help in functioning of many-celled organisms. Therefore, the right choice is: many-celled organisms.

Answer:

The charge that will pass through the wire will be approx. 0.003C.

Explanation:

Two equations are relevant to answer this question:

(1) The charge (Q) over a capacitance (C), given a voltage (U):

[tex]Q = C\cdot U[/tex]

and

(2) the capacitance of a parallel-plate capacitor:

[tex]C=\varepsilon \frac{A}{d}[/tex]

with [tex]\varepsilon[/tex] being the dielectric constant, A the plate area and d their distance.

We are given the capacitance when air is present (80 micro-Farad, or uF). The dielectric constant for air/vacuum is 8.84 pico-Farad per meter. Then someone sneaky slides a slab of dielectric medium with dielectric constant of 20 pF/m and connects a source of 30V. By inserting the slab, they increased the capacitance by a factor of 20/8.84=2.26, making it 2.26*80=181uF. By connecting it to the source 30V, they charged our capacitor to a charge

[tex]Q = C\cdot V = 181\cdot 10^{-6}F\cdot 30V=5.43\cdot 10^{-3}C[/tex]

but, the sneaky person changes his mind and removes the slab, effectively changing C down to the original 80uF. There is now excess charge on the capacitor that wants to leave! The steady-state charge on the air-filled capacitor should be:

[tex]Q_0 = C_0\cdot V = 80\cdot 10^{-6}F\cdot 30V=2.4\cdot 10^{-3}C[/tex]

The charge that will pass through the wire will be the difference:

[tex]Q-Q_0=(5.43-2.40)\cdot 10^{-3}C\approx 3\cdot 10^{-3}C[/tex]

The change in the kinetic energy of the object as the speed changes is proportional to the square of the factor by which the speed changes. For example if the speed of the object becomes double, its kinetic energy changes to four times the initial kinetic energy.

Answer:

12,558 J

Explanation:

The amount of heat absorbed by the water is given by:

[tex]Q=mC_S \Delta T[/tex]

where

m = 50 g is the mass of the water

[tex]C_s = 4.186 J/gC[/tex] is the water specific heat

[tex]\Delta T=90C-30C=60^{\circ}C[/tex] is the temperature increase of the water

Substituting into the formula, we find

[tex]Q=(50.0 g)(4.186 J/gC)(60^{\circ}C)=12,558 J[/tex]

To find the amount of heat absorbed by the water, we use the formula for heat calculation q = m × c × ΔT. With a known heat capacity of water mass and temperature change we find the heat absorbed is 12552 J.

To calculate the quantity of heat absorbed by the water, we use the formula for heat (q) which is q = m × c × ΔT . In this equation, 'm' stands for mass, 'c' represents the specific heat capacity, and 'ΔT' is the change in temperature.

 The specific heat capacity (c) of water is 4.184 J/g °C, the change in temperature (ΔT) is 90°C - 30°C = 60°C, and the mass (m) of water is 50g. Substituting these values into our formula:

 q = 50g × 4.184 J/g °C × 60°C

q = 12552 J

This value represents the heat absorbed by the water.

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They both transfer energy through a medium in form of waves.

Transverse waves have perpendicular disturbances relative to the wave's direction, while longitudinal waves have parallel disturbances. Examples include strings of musical instruments and light for transverse, and sound for longitudinal waves. Amplitude is independent of wave speed in both types.

Transverse and longitudinal waves both involve the transmission of energy through a medium by means of periodic disturbances. A transverse wave is characterized by the disturbance being perpendicular to the direction of wave propagation. This means that if the wave moves horizontally, the disturbance moves vertically. Examples of transverse waves include waves on strings of musical instruments and electromagnetic waves like visible light.

In contrast, a longitudinal wave, also known as a compressional wave or compression wave, has disturbances that move parallel to the direction of the wave propagation. Sound waves in air and fluids exemplify longitudinal waves, where the periodic disturbances are variations in pressure.

The amplitude of a wave, which is the size of the disturbance, does not affect the wave's speed of propagation. Whether a wave is transverse or longitudinal, its amplitude is completely independent of its speed (Vw or Uw). Additionally, there are waves that combine both transverse and longitudinal characteristics, such as seismic waves resulting from earthquakes.

50 mph

100 divided by 2

Final answer:

At a constant voltage, current and resistance are inversely related as per Ohm's Law, with current decreasing as resistance increases, and vice versa.

Explanation:

When the voltage in a circuit is held constant, the current flowing through the circuit is inversely proportional to the resistance. This relationship is encapsulated by Ohm's Law, which states that the current (I) is equal to the voltage (V) divided by the resistance (R), mathematically represented as [tex]I = \frac{V}{R}[/tex].

As such, if the resistance in the circuit increases while the voltage remains unchanged, the current will decrease. Conversely, if the resistance decreases, the current will increase.

The resistance is influenced by factors such as the material of the conductor and its temperature. At a constant temperature, the resistance remains steady regardless of the changes in voltage or current.

Therefore, when considering Ohm's Law in a practical scenario, such as household electrical circuits, resistance plays a critical role in determining the current that flows through an appliance.

The answer is A. Solids have both definite shape and denfinite volume.

The correct statement that describes the properties of solids is A. Solids have both a fixed shape and a fixed volume, resulting from the particles being in fixed positions and bound by strong intermolecular forces.

Among the statements given, the one that best describes the properties of solids is: A. Solids have both definite shape and definite volume. In the solid state, the particles that make up the material are in fixed positions relative to each other because the thermal energy is not sufficient to overcome the strong intermolecular forces that bind them. This result is that solids have a rigid and definite shape, and they also have a definite volume, which means they do not change volume or shape unless a force is applied that alters their structure.

Liquids, on the other hand, have a definite volume but no definite shape, assuming the shape of their containers. Gases fill their containers completely, expanding to fill the volume available and thus having neither a definite volume nor a definite shape.

The product of (wavelength) x (frequency) is always the same number ... the wave's speed.  

So if the wavelength is somehow reduced to  1/4  its original length, the frequency is immediately multiplied by 4 .  That's the only way their product can remain the same.

The frequency increases by a factor of four when the wavelength is lowered by a factor of four.

Frequency is defined as the number of repetitions of a wave occurring waves in 1 second.

Frequency is given by the formula as,

[tex]\rm v = \lambda \times f[/tex]

If a wave travels at a constant speed the e frequency is inversely proportional to the wavelength.

if the wavelength is reduced by a factor of 4 then the frequency increases by a factor of 4.

Hence, the frequency increases by a factor of 4.

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A. Horizontal component: 7.3 m/s

Explanation:

The horizontal component of the velocity is given by:

[tex]v_x = v_0 cos \theta[/tex]

where

[tex]v_0 = 16 m/s[/tex] is the magnitude of the initial velocity

[tex]\theta=63^{\circ}[/tex] is the angle of the initial velocity with respect to the ground

Substituting numbers into the equation, we find

[tex]v_x = (16 m/s) cos 63^{\circ}=7.3 m/s[/tex]

B. Vertical component: 14.3 m/s

Explanation:

The vertical component of the velocity is given by:

[tex]v_y = v_0 sin \theta[/tex]

where

[tex]v_0 = 16 m/s[/tex] is the magnitude of the initial velocity

[tex]\theta=63^{\circ}[/tex] is the angle of the initial velocity with respect to the ground

Substituting numbers into the equation, we find

[tex]v_y = (16 m/s) sin 63^{\circ}=14.3 m/s[/tex]

= 4 feet

The height of the wave is defined as the elevation of the crest minus the elevation of the trough. or

The wave height is defined as the twice of the amplitude

It is given that the amplitude of the wave is 4 feet. The height of the wave is given as;

H = 2a

Where a is the amplitude of the wave.

Therefore, H = 4 feet.

Answer:

The last part on the right side of the diagram

Explanation:

Im on plato and just got it right :)

The last part on the right end of the given wave has the highest frequency.

The frequency can be defined as the number of oscillations of a wave in 1 second. The wavelength can be described as the distance between the two crests or troughs on a wave that is separated by a distance.

For periodic waves, media in which the wave speed is independent of frequency, therefore the frequency has an inverse relationship to the wavelength.

[tex]{\displaystyle f={\frac {v}{\lambda }}[/tex]

In electromagnetic waves in vacuum, then v = c, where c is the speed of light:

[tex]{\displaystyle f={\frac {c}{\lambda }}[/tex]

When monochromatic waves propagate from one medium to another, their frequency will remain the same.

Frequency can be defined as the number of occurrences of a repeating event per unit of time. Frequency can be measured in hertz (Hz) which is generally equal to one event per second.

Therefore, the part at the very right of the wave has the highest frequency.

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Answer:

work being done on an object.

Answer. A. A man pushes a couch across the room

diagram identifies an axle:

Answer: B. Z

simple machine described as a shaft at the center of a wheel:

Answer: D. Wheel and axle

Type of lever:

A. a catapult

Answer:

work being done on an object.

Answer. A. A man pushes a couch across the room

diagram identifies an axle:

Answer: B. Z

simple machine described as a shaft at the center of a wheel:

Answer: D. Wheel and axle

Type of lever:

A. a catapult

Explanation: