What type of image is formed by a lens if m = 3.0?
A. A virtual image that is smaller than the object
B. A virtual image that is larger than the object
C. A real image that is larger than the object
D. A real image that is smaller than the object

The mass number of an element tells us the number of protons AND neutrons in an atom (the two particles that have a measurable mass). Sodium has a mass number of 23amu. Since sodium has 11 protons, the number of neutrons must be 23 – 11 = 12 neutrons.

They become charged particles called ions.

The list of choices you gave us doesn't have any true statements on it.

The statement  true of a concave lens  is Option A.

Concave lens is a type of spherical lens which is polished from outside and it reflects the light coming from the object through its inner surface.

This lens is diverging in nature which means that the light rays gets diverged after reflection.

The nature of the image formed by these lens is virtual and the size of the image will be less than the object and the image formed will be upright.

Hence, the correct option is A.

Learn more about concave lens.

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The term that describes the number of thoughs that pass a point in a given amount of time is FREQUENCY.

In wave theory, frequency refers to the number of wave that pass through a fixed point in a given amount of time. Frequency is usually measure in Hertz. The mathematical formula for finding frequency is:

F = Velocity of wave / wavelength of wave.

4 m/s²

When both forces point due east  then;

the resultant force will be; 10 + 30 = 40 N due east

But; From second Newton's law of motion;

F = ma

Thus;

a = F/m ; F= 40 N and mass = 10 kg

  = 40/ 10

  = 4 m/s² to wards east

1 m/s²

when 10 N force points due east and 30 N force points due west then;

the resultant force will be; 30 N - 10 N = 10 N due west

But; From second Newton's law of motion;

F = ma

Thus;

a = F/m

   = 10 /10

   = 1 m/s² , towards the west direction

Explanation:

Given that,

First force = 10 N

Second force = 30 N

Mass of box = 10 kg

(1). When both forces point due east

Then the net force will be

[tex]F_{net}=F_{1}+F_{2}[/tex]

[tex]F_{net}=10+30[/tex]

[tex]F=40 N[/tex]

We need to calculate the acceleration

Using newton's second law

[tex]F= ma[/tex]

put the value into the formula

[tex]40=10\times a[/tex]

[tex]a=\dfrac{40}{10}[/tex]

[tex]a=4\ m/s^2[/tex]

The box accelerate towards east.

(2). When 10 N force points due east and 30 N force points due west.

Then the net force will be

[tex]F_{net}=F_{2}-f_{1}[/tex]

[tex]F_{net}=30-10=20\ N[/tex]

We need to calculate the acceleration

Using newton's second law

[tex]F= ma[/tex]

[tex]20=10\times a[/tex]

[tex]a=\dfrac{20}{10}[/tex]

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

The box accelerate towards west.

Hence, This is the required solution.

The answer is modulation. In modulation a radio wave (also called the "carrier signal") is changed by the signal we want to send to the receiver, for example a song, or, in a wireless network, some data from a computer.

Answer:

Radio waves carry conversations, music, pictures, and information.

Explanation:

power ratings basically just compare with how many watts are used, like a tackle in football compares to a car engine

For historical reasons, the horsepower is occasionally used to describe the power delivered by a machine. One horsepower is equivalent to approximately 750 Watts. ... Thus, the power of a machine is the work/time ratio for that particular machine. A car engine is an example of a machine that is given a power rating.

Informal and formal learning both require effort and are significance. Neither is better than the other. So the answer is "One is more structured than the other."

chemical energy into mechanical energy as well as heat.

Answer:

Explanation:

1.1772 N

Given in the question,

mass of an object = 0.12 kg

To find the weight of this object we will use formula

weight = mass x acceleration due to gravity

We know that acceleration due to gravity on earth is constant = 9.81 m/s²

So,

weight = 0.12 x 9.81

           = 1.1772 N

Since it is not mention that were the object is so i assume that it is on earth but if it is on moon then acceleration due to gravity will be 1.625 m/s²

Answer:

51.9 m/s, horizontal

Explanation:

The horizontal and vertical components of the initial velocity of the projectile are given by:

[tex]v_x = v cos \theta=(65.0 m/s)(cos 37^{\circ})=51.9 m/s\\v_y = v sin \theta=(65.0 m/s)(sin 37^{\circ})=39.1 m/s[/tex]

In a projectile motion, the horizontal component of the velocity does not change (because there are no forces acting in the horizontal direction), while the vertical velocity changes according to:

[tex]v_y(t)=v_{0y}-gt[/tex]

where g=9.8 m/s^2 is the acceleration due to gravity. However, at the point of maximum height, the vertical velocity is zero (because it is the point at which the projectile starts falling down), so the magnitude of the resultant velocity will simply be equal to the horizontal component:

v = 51.9 m/s

and the direction will be horizontal.

The magnitude of the velocity at the maximum height is 52.0 m/s and the direction is horizontal.

To determine the magnitude and direction of the velocity at the maximum height of a projectile, we need to analyze its motion. At the maximum height, the vertical component of the velocity becomes zero, while the horizontal component remains constant. Since the initial velocity is given as 65.0 m/s at an angle of 37º above the horizontal, we can use trigonometry to determine the horizontal and vertical components of the velocity.

The horizontal component of the initial velocity can be calculated as: Vx = initial velocity * cos(angle) = 65.0 m/s * cos(37º) = 52.0 m/s

At the maximum height, the vertical component of the velocity is zero. We can calculate the vertical component of the initial velocity as: Vy = initial velocity * sin(angle) = 65.0 m/s * sin(37º) = 39.0 m/s

Therefore, at the maximum height, the magnitude of the velocity is 52.0 m/s and the direction is horizontal or along the x-axis.

At the release point, the ball has kinetic energy,

[tex]\dfrac12m{v_0}^2[/tex]

and at its maximum height it has potential and kinetic energy,

[tex]-mgy+\dfrac12mv^2[/tex]

where [tex]y[/tex] is the maximum height attained above the release point.

The LoCoE tells us that we should have

[tex]\dfrac12m{v_0}^2=-mgy+\dfrac12 mv^2[/tex]

[tex]\implies v^2-{v_0}^2=-2gy[/tex]

[tex]\implies\left(7.20\dfrac{\rm m}{\rm s}\right)^2-\left(8.30\dfrac{\rm m}{\rm s}\right)^2=-2\left(9.80\dfrac{\rm m}{\mathrm s^2}\right)y[/tex]

[tex]\implies y=0.870\,\mathrm m[/tex]

Answer: The maximum height of the ball is 0.87 m

Explanation:

To calculate the height of the ball, we use third equation of motion:

[tex]v^2-u^2=2as[/tex]

where,

s = distance traveled  / height of the ball = ?

u = initial velocity of the ball = 8.30 m/s

v = final velocity of the ball = 7.20 m/s

a = acceleration due to gravity = [tex]-9.8m/s^2[/tex]  (negative sign represents the ball is going upwards that is against gravity)

Putting values in above equation, we get:

[tex](7.20)^2-(8.30)^2=2\times (-9.8)\times s\\\\s=\frac{(7.20)^2-(8.30)^2}{(2\times (-9.8))}=0.87m[/tex]

Hence, the maximum height of the ball is 0.87 m

Do Not Know but let me ask my Brother bc he did it last Year

The maximum height of the rock above the surface is 202 m

Answer:

It should be A.

Explanation:

Wire A and wire B are made from the same material and have the same length, however, wire A is wider which would allow more electricity or power to be transformed.

Unless im understanding your question wrong, but from what I do understand it is most likely A.

Hope this helps, could you mark me brainliest if it is right?

Answer: Each consecutive disturbance has a further distance to travel before reaching observer A. For this reason, observer A observes a frequency of arrival that is less than the frequency at which the disturbances are produced.

Explanation:

The Doppler Effect

Suppose that there is a happy bug in the center of a circular water puddle. The bug is periodically shaking its  legs in order to produce disturbances that travel through the water. If these disturbances originate at a point, then they would travel outward from that point in all directions. Since each disturbance is traveling in the same medium, they would all travel in every direction at the same speed. The pattern produced by the bug's shaking would be a series of concentric circles as shown in the diagram at the right. These circles would reach the edges of the water puddle at the same frequency. An observer at point A (the left edge of the puddle) would observe the disturbances to strike the puddle's edge at the same frequency that would be observed by an observer at point B (at the right edge of the puddle). In fact, the frequency at which disturbances reach the edge of the puddle would be the same as the frequency at which the bug produces the disturbances. If the bug produces disturbances at a frequency of 2 per second, then each observer would observe them approaching at a frequency of 2 per second.

Now suppose that our bug is moving to the right across the puddle of water and producing disturbances at  the same frequency of 2 disturbances per second. Since the bug is moving towards the right, each consecutive disturbance originates from a position that is closer to observer B and farther from observer A. Subsequently, each consecutive disturbance has a shorter distance to travel before reaching observer B and thus takes less time to reach observer B. Thus, observer B observes that the frequency of arrival of the disturbances is higher than the frequency at which disturbances are produced. On the other hand, each consecutive disturbance has a further distance to travel before reaching observer A. For this reason, observer A observes a frequency of arrival that is less than the frequency at which the disturbances are produced. The net effect of the motion of the bug (the source of waves) is that the observer towards whom the bug is moving observes a frequency that is higher than 2 disturbances/second; and the observer away from whom the bug is moving observes a frequency that is less than 2 disturbances/second. This effect is known as the Doppler effect.

Answer:frequency increases

Use the equation q=mc/\T, where q is the heat lost, m is mass, and /\T is the change in temperature, and c is the specific heat.

q=50kg(3470J/kg K)(2K)

q=347000 J

Any other questions, just ask.

The heat lost from Nova's body is calculated using the specific heat formula Q = mcΔT. Substituting in the given values, we find that Nova's body lost 347,000 joules of heat.

The amount of heat lost by Nova's body can be calculated using the specific heat formula which is: Q = mcΔT, where 'Q' is the heat transferred, 'm' is the mass, 'c' is the specific heat, and 'ΔT' is the change in temperature. In this case, you would substitute the given values into this formula: Q = (50.0kg) * (3470J/kg°C) * (2.00°C)

When you multiply these together, the resulting heat loss is 347,000 joules. Therefore, Nova's body lost 347,000 joules of heat while she was skiing.

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Answer:

A. Distance over which the force is applied

Explanation:

As we know that in pulley system the mass of the car is balanced by the tension in the string

so here we will have

[tex]T = r \times F[/tex]

so here in order to decrease the force needed to lift the car we have to increase Distance over which the force is applied

So here if we increase the distance over which force is applied then it will reduce the effort applied by us in this pulley system as the torque will be more if the distance is more.

C. measure their amplitudes

C measures their amplitudes. Hope this helps! :)

From the Earth, we can see multiple phases of the Moon in a 28 days cycle. These phases are not changes int he Moon or how much of it is lightened, but instead it is a result of the positions that the Earth, Moon, and Sun have in relation to each other. The Sun is always lighting one half of the Moon, which is the half that is turned toward it. From the Earth it doesn't seem that way, as we can see Moon that seems fully light, partially light on the left side, partially light on the right side, or totally dark, but all of that depends on how much of the lighted side of the Moon is turned toward the Earth.

76.3°C

Considering the fact that;

Specific heat capacity of the hot chocolate = 3.751 kJ/kg C°

Specific heat capacity of milk is 3.93 kJ/(kg.C°)

But;

Heat gained by milk = Heat lost by hot chocolate

If the final temperature is x , then

Heat gained by milk

= 0.05 × 3.93 × (x-5)

= 0.1965x - 0.9825

Heat lost by hot chocolate;

= 0.2 × 3.751 × (95-x)

= 71.269 - 0.7502x

Therefore;

0.1965x - 0.9825 = 71.269 - 0.7502x

0.1965 x + 0.7502x = 71.269 + 0.9825

                  0.9467 x  = 72.2515

                               x = 76.319 °C

Approximately, the new temperature is 76.3°C

It must have a medium to travel through.

Happy to help. Marking me the brainliest would really be appreciated.

Static electricity

hope this helps :)

the answer to this question is static electricity

Answer:

D Closer to moon than earth because earth has a greater mass than the moon

Explanation:

As we know that gravitational force is given by

[tex]F = \frac{Gm_1m_2}{r^2}[/tex]

so here if the net gravitational force at some distance between moon and earth is zero or equal due to moon and earth then in that case

[tex]F_{moon} = F_{earth}[/tex]

so here we can say

[tex]\frac{GM_m m}{r_1^2} = \frac{GM_e m}{r_2^2}[/tex]

so here we will have

[tex]\frac{M_m}{M_e} = \frac{r_1^2}{r_2^2}[/tex]

since mass of earth is more than mass of moon so we can say

[tex]\frac{r_1}{r_2} < 1[/tex]

so here we have

[tex]r_1 < r_2[/tex]

so the position is closer to moon because moon is of smaller mass than earth

Final answer:

In a spacecraft launched from Earth toward the moon, the spacecraft will be closer to the moon than to Earth when the gravitational forces acting on it are equal.

Explanation:

In a spacecraft launched from Earth toward the moon, the spacecraft will be closer to the moon than to Earth when the gravitational forces acting on it are equal.

The gravitational force between two objects depends on their masses and the distance between them. Although the moon has smaller mass compared to Earth, it is much closer to the spacecraft when it reaches that point where the gravitational forces are equal. This is because the spacecraft has traveled a greater distance away from Earth.

So, the correct answer is option B, closer to the moon because the moon has greater mass than the earth.

Answer:

Hence, the correct option is (A) "If the mass of each object is very small".

Explanation:

The gravitational force between two objects is directly proportional to the product of masses and inversely proportional to the square of the distance between them.

The mathematical expression is given by :

[tex]F=G\dfrac{m_1m_2}{d^2}[/tex]

d is the distance between masses

Gravitational force is one of the fundamental force in the universe. If the masses of objects is too small, then their interaction with each other is hard to detect.

Hence, the correct option is (A) "If the mass of each object is very small".

Metals - The close packing of the metal ions in the lattice and the delocalised electrons ensure it can carry kinetic energy through the lattice.

Non - metals have fewer free electrons and electrons are held tightly, meaning they're not allowed to move freely.

Final answer:

Metals are good electrical conductors due to their free electrons that allow for easy flow of charge, while non-metals are poor conductors as their electrons are more tightly bound. This electron structure difference makes metals suitable for electrical wiring and non-metals for insulation.

Explanation:

Metals are generally good conductors of electricity because they have free electrons that can move easily between atoms, providing a path for electrical charge to flow. This is why metals like copper and gold are commonly used in electrical conducting wires. On the other hand, non-metals are typically poor conductors of electricity, as their electrons are more tightly bound to their atoms and do not move freely. Materials like plastic, wood, and glass are examples of non-conductors or insulators. Therefore, the fundamental distinction between metals and non-metals in terms of conductivity is based on how their electrons are structured and interact.

Properties of Metals and Nonmetals

Metals have a shiny lustre, are malleable and ductile, making them ideal for making jewellery and cooking utensils.

Non-metals, such as sulfur and oxygen, are neither malleable nor ductile, and they usually do not conduct heat and electricity well.

Moving beyond electrical conductivity, materials can also be classified by magnetism, thermal conductivity, and other properties, emphasizing the versatility and range of uses for different elements based on their conducting abilities.

laser in the garage . . . D

wavelength of a sound . . . C

how sound travels . . . B

electromagnetic spectrum . . . D

Final answer:

The garage door safety mechanism functions by blocking a laser beam, which triggers the system to halt the door. The wavelength of sound informs us about pitch, with longer wavelengths corresponding to lower pitches. The speed of sound is dependent on the medium it travels through, and infrared light waves are not visible to the human eye.

Explanation:

The component that prevents a garage door from closing if there is an obstruction works as follows: The laser light travels in a straight line towards the receiver, and if an object blocks this path, the door will not close. The correct answer is D. An object in the path interrupts the beam, which signals the system to stop the door.

Regarding sound waves, the wavelength of a sound provides information about the pitch of the sound, which means C is the correct answer. A longer wavelength correlates with a lower pitch, and vice versa.

The speed of sound does not remain constant and varies depending on the material through which it travels, making B the correct statement. This variability is due to differences in density and elasticity of different media.

In the electromagnetic spectrum, D is the false statement because infrared light waves are not visible to the human eye. The electromagnetic spectrum includes a range of wavelengths, some visible and some not, such as infrared.

80.87 °C

Change in Temp of metal = (C of water *mass of water* Change in temp of water)/(C of metal*mass of metal)

That is;

Change of temp. of metal

   = [(4186 J/kg*°C)×(0.15kg)×(25°C-21°C)/[(899 j/kg*C)×(0.050kg)

     = 55.87 °C

The change in temp of the metal is -55.87 °C  as the metal cools down

Therefore;

Change in temperature = Final Temperature-Initial Temperature Initial                                       Temperature = Final Temp.-Change in Temp

                      =25 °C- (-55.87 °C)

                       = 80.87 °C

The normal force is always (underline, bold) is always perpendicular to the surface an object is sitting on. If the object is on an inclined plane, then the normal will not be vertical but it will be perpendicular to the angle of the incline.

The diagram below (left) shows a normal force (GH) that is not vertical, but it is perpendicular to the surface. The object on the right is the more usual normal a mass on a table top.

The vertical line on the right is the normal and it points up.

The correct option is A. perpendicular

In Physics, the normal force is the component of a contact force that is perpendicular to the surface that an object contacts. It is the support force exerted upon an object that is in contact with another stable object. Normal Force will be always acting opposite to the force falling on the surface. For example, if a book is resting upon a surface, then the surface is exerting an upward force upon the book in order to support the weight of the book.