Work is done on an object only if the force and displacement are
О the same magnitude
O in the same direction
O in the same day
O done by the same person

a)  The net Work done is zero. b) The work done on the block by the applied force F as the block moves a distance L is -41.2 J. c) The work done on the block by the applied force F as the block moves a distance L is 41.2 J.

Given:

Weight of the block (w) = 25.0 N

Distance moved by the block (d) = 3.40 m

The angle of the inclined plane (θ) = 29.0°

a) we know that from the work-energy theorem,

W = change in kinetic energy

But since speed is constant which means no change in KE, hence the net Work done is zero.

b) W = -mgy

W = -25 × (3.10 × sin29°)

W = -41.2 J

Therefore, the work done on the block by the force of gravity is -41.2 J.

c) The work done on the block by the applied force F as the block moves a distance L = 3.10m up the incline is,

W = Fd

W = 12.1 × 3.1

W = 41.2 J

Therefore, the work done on the block by the applied force F as the block moves a distance L is 41.2 J.

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Answer:

A

Explanation:

I took the test

Answer:

It is an educated guess

Explanation:

let me know if the bottom ones need to be answered too.

1. The current through the resistor R1 just after the switch is closed can be found by using Kirchhoff's laws. The capacitor is initially uncharged, so it behaves like a short circuit.

Therefore, the circuit can be simplified to a series circuit with R1, R2, R3, R4 and the battery. The total resistance of the circuit is R_total = R1 + R2 + R3 + R4 = 256 Ω. The current flowing through the circuit is given by Ohm's law, I = V/R_total, where V is the battery voltage. Therefore, I1(0) = V/R_total = 24/256 = 0.09375 A.

2. A long time after the switch has been closed, the capacitor will be fully charged and behave like an open circuit. Therefore, the circuit can be simplified to a series circuit with R1, R2, R3, R4 and the capacitor. The total resistance of the circuit is still R_total = R1 + R2 + R3 + R4 = 256 Ω. The current flowing through the circuit is given by Ohm's law, I = V/R_total, where V is the battery voltage. Therefore, I1([infinity]) = V/R_total = 24/256 = 0.09375 A.

3. A long time after the switch has been closed, the capacitor will be fully charged to the voltage of the battery, V = 24 V. The charge on the capacitor is given by Q = CV, where C is the capacitance. Therefore, Q([infinity]) = C×V = 82×10⁻⁶ × 24 = 1.968×10⁻³C.

4. With R5 = 94 Ω in series with the capacitor, the total resistance of the circuit is R_total = R1 + R2 + R3 + R4 + R5 = 350 Ω. The current through the circuit just after the switch is closed can be found using the same method as in part 1. Therefore, I1(0) = V/R_total = 24/350 = 0.06857 A.

5. A long time after the switch has been closed, the charge on the capacitor can be found by considering the equivalent circuit with R1, R2, R3, R4 and R5 in series with the capacitor. The total resistance of the circuit is R_total = R1 + R2 + R3 + R4 + R5 = 350 Ω. The voltage across the capacitor is V = IR5, where I is the current flowing through the circuit. Therefore, Q([infinity]) = CV = (IR5)C = (V/R_total)R5C = (24/350)×94×10⁻⁶= 1.608×10⁻³ C.

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Answer:

yes

Explanation:

Answer:

Yes

Explanation:

The core of an electromagnet serves to stabilize the magnetic field created by the wire. The thicker the core, the more metal there is to amplify the current. Therefore, a thicker core does make an electromagnet stronger. Hope this helps!

Answer:

39850.785 J

Explanation:

0.5 x m x v^2

0.5x13x78.3^2

Answer:

KE =

\( \frac{1}{2} m {v}^{2} \\ \)

Explanation:

\(ke = \frac{1}{2} m {v}^{2} \\ = \frac{1}{2} \times 13 \times {78 . 3}^{2} \\ ke = 39850.785j \\ \)

Given data

*The given horizontal piper of diameter is D = 3.0 cm = 0.03 m

*The given depth is d = 5.0 m

*The given water desnsity is

(a)

The magnitude of the frictional force between the plug and pipe wall is given as

*Here r = d/2 is the radius

Substitute the values in the above expression as

(b)

The volume flow rate is calculated as

The total volume is calculated as

Answer:

Scientific notation 6.42×10^21

The statement(s) concerning charge carrier Mobility are:

(iii) Mobility can be influenced by scattering events.

(iv) In an intrinsic semiconductor, the mobility of electrons in the conduction band is the mobility of holes in the valence band. Mobility is dependent on the drift velocity and the diffusion speed of charge carriers. The correct options are (iii) & (iv).

The mobility of charge carriers refers to their ability to move through a material under the influence of an electric field. Scattering events, such as collisions with impurities, defects, or lattice vibrations, can affect the mobility of charge carriers.

This is why statement (iii) is correct. In an intrinsic semiconductor, the mobility of electrons in the conduction band is equal to the mobility of holes in the valence band, which is stated in (iv).

However, statement (i) is incorrect because with increasing temperature, lattice vibrations increase, leading to more scattering events and a decrease in mobility. Statement (ii) is also incorrect because mobility can change under an applied electric field due to various factors like scattering and temperature.

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The maximum possible efficiency of an automobile engine with an exhaust temperature of 120°C and a burning gas temperature of 620°C is 0.46, which corresponds to Option D.

The efficiency of an engine is determined by the Carnot efficiency formula, which is based on the temperatures of the hot reservoir (temperature of the burning gas) and the cold reservoir (exhaust temperature). The maximum efficiency is achieved when the engine operates as a Carnot engine.

Using the Carnot efficiency formula:

Efficiency = 1 - (Tc / Th)

Where Tc is the temperature of the cold reservoir (exhaust temperature) and Th is the temperature of the hot reservoir (burning gas temperature).

Plugging in the given values:

Efficiency = 1 - (120°C / 620°C) = 1 - 0.1935 ≈ 0.8065 ≈ 0.46 (rounded to two decimal places)

Therefore, the correct answer is Option D, 0.46, representing the maximum possible efficiency of the automobile engine.

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Answer:

This rapid growth increase was mainly caused by a decreasing death rate (more rapidly than birth rate), and particularly an increase in average human age. By 2000 the population counted 6 billion heads, however, population growth (doubling time) started to decline after 1965 because of decreasing birth rates.

Explanation:

The main cause of human population growth is increased well-being.

Well-being is a term to refer to the state of satisfaction of economic, social, labor, psychological, biological needs, among others of the human.

Therefore, when civilizations and societies became more complex, many issues such as health, food, hygiene, education, government, among others, improved, giving more well-being to their inhabitants.

Well-being has evolved with society and today people have access to many things, services, and goods that give them well-being, improving their quality and life expectancy. Therefore, the correct answer is well-being.

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Answer:

25 mm = 0 deg C

200 mm = 100 deg C

200 - 25 = 175 = change in thread per 100 deg C

95 - 25 = 70 mm - change in thread from 0 deg C

70 / 175 * 100 = 40 deg C    final temperature at 95 mm

Answer:

Explanation:

Given:

m = 2.0 kg

Wk = 225 J

__________

H - ?

Wp = m*g*H

Wp = Wk

m*g*H = 225

H = 225 / (m*g) = 225 / (2.0*9.8) ≈ 11,5 m

In the empirical equation relating density and pressure of a fluid, the unit of density is pounds mass per cubic foot (lbm/ft³), and the unit of pressure is pounds force per square inch (lbf/in²).

The given empirical equation relates the density (ρ) of a fluid to the pressure (P) it experiences. While the specific form of the equation is not provided, we can determine the units of density and pressure based on common conventions in fluid mechanics.

Density is a measure of mass per unit volume. In this equation, the unit of density is pounds mass per cubic foot (lbm/ft³). The pound (lb) is a unit of mass, and the cubic foot (ft³) is a unit of volume.

Pressure is a measure of force per unit area. In the given equation, the unit of pressure is pounds force per square inch (lbf/in²). The pound force (lbf) is a unit of force, and the square inch (in²) is a unit of area.

These units are commonly used in engineering and fluid mechanics to express the density and pressure of fluids. It is crucial to maintain consistent units throughout calculations and analysis to ensure accurate results.

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First, take into account that the difference in time between the third chirp and the third echo is:

t = 0.10s - 0.02s = 0.08s

next, consider that in such a time, the sound emitted by the bat travels twice the distance in between the bat and the moth, then, you have:

2d = v*t

where v is the speed of sound 340 m/s

solve the equation above for d, and replace the values of the previous parameters, as follow:

d = v*t/2

d = (340 m/s)(0.08 s)/2

d = 13.6 m

Hence, the distance between the moth and the bath is 13.6 m

The greater the molecular motion, the greater the pressure the molecules exert. The correct option is 2.

The movement of constituent particles or molecules in a specific direction is defined as molecular motion. Heat and temperature have an effect on molecular motion.

This is because the pressure is the result of the collisions of gas molecules with the walls of the container they are in. When the molecular motion of the gas molecules increases (due to an increase in temperature, for example), they move faster and collide with the walls of the container with greater force and frequency, which increases the pressure exerted by the gas.

Conversely, when the molecular motion of the gas molecules decreases (due to a decrease in temperature, for example), they move more slowly and collide with the walls of the container with less force and frequency, which decreases the pressure exerted by the gas.

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Answer:

Explanation:

Minimum force needed to set the flower in motion = maximum frictional force

possible on the flower by the floor .

= μ x mg

where μ is coefficient of friction of the floor and mg is weight of the flower

= .76 x 11 x 9.8

= 81.9 N

When the flower is in motion , kinetic friction is applied on it

Force of kinetic friction applied on it

= μk x mg where μk is coefficient of  kinetic friction of the floor

= .44 x 11 x 9.8

= 47.43 N

Pushing force is 81.9 N , so net force on flower when it is in motion

= 81.9 - 47.43 N

= 34.47 N

Acceleration = net force / mass

= 34.47 / 11

= 3.133 m /s

distance moved by flower in 3.75 s

s = ut + 1/2 a t²

= 0 + .5 x 3.133 x 3.75²

= 22 m

The formula to calculate the file size of an audio file is: File size = sample rate x bit depth x number of channels x duration in seconds.

Given that an audio signal is sampled at a rate of 1024 Hz, we can calculate the file size of such an audio file with the formula above. For a stereo type audio file, we have 2 channels. Radio quality audio files typically have a bit depth of 16 bits.

To calculate the duration in seconds for a 1 minute audio file, we have to multiply 1 minute by 60 seconds, which is equal to 60 x 1 = 60 seconds. File size = 1024 x 16 x 2 x 60 = 1,572,864 bits or 196,608 bytesTherefore, the file size of a stereo type but radio quality audio file with a duration of 1 minute and sampled at a rate of 1024 Hz is 1,572,864 bits or 196,608 bytes.

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Projectile motion is the motion of an object thrown (projected) into the air. After the initial force that launches the object, it only experiences the force of gravity. The object is called a projectile, and its path is called its trajectory. As an object travels through the air, it encounters a frictional force that slows its motion called air resistance. Air resistance does significantly alter trajectory motion, but due to the difficulty in the calculation, it is ignored in introductory physics.

the components of the following projectile's velocity into X- the axis and Y - axis

1. vx = 35 cos15°  and vy sin15°

2. vx = 35 cos30° and vy sin30°

3. vx = 35 cos45° and vy sin45°

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1. The correct answer is b. The steeper the gradient, the higher the velocity. The stream gradient refers to the change in elevation of a stream over a certain distance. When the gradient of a stream is steeper, it means that the stream has a greater change in elevation per unit of distance. This steepness creates a greater gravitational force, causing the water to flow faster downstream. Therefore, a higher stream gradient is associated with a higher velocity of the stream.

2. The correct answer is b. The larger the width, the higher the velocity. Stream width refers to the horizontal distance across the stream channel. When a stream has a larger width, it means that there is a greater cross-sectional area for the water to flow through. As a result, the water has more space to move, leading to increased velocity. This is due to the conservation of mass principle, where a larger width allows for a higher volume of water to pass through, resulting in a higher velocity.

3. The correct answer is b. False. Floods usually occur when precipitation falls faster than water can be absorbed into the ground or carried away by rivers or streams. When there is heavy or prolonged rainfall, the rate of precipitation exceeds the rate at which the ground can absorb the water or the rivers and streams can carry it away. As a result, the excess water accumulates on the surface, leading to flooding. It is important to note that flooding can also occur due to other factors such as dam failures, snowmelt, or tidal surges.

4. The correct answer is a. Heavily vegetated lands are less likely to experience flooding. Vegetation, especially trees and plants with extensive root systems, can help reduce the risk of flooding. The roots of vegetation act as natural barriers and can absorb a significant amount of water from the soil, reducing the amount of runoff into streams and rivers. Additionally, vegetation helps to stabilize the soil, preventing erosion and maintaining the capacity of water absorption. Therefore, heavily vegetated lands serve as a protective measure against flooding by slowing down the flow of water and increasing the water retention capacity of the soil.

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The correct format of the question should be:

1. How does the stream gradient affect its velocity?

a. The steeper the gradient, the lower the velocity

b. The steeper the gradient, the higher the velocity

c. There is no significant relationship between the gradient and the velocity of a stream

2. How does the stream width affect its velocity?

a. The largest the width, the lower the velocity

b. The largest the width, the higher the velocity

c. There is no significant relationship between the width and the velocity of a stream.

3. Floods usually occur when precipitation falls slower than that water can be absorbed into the ground or carried away by rivers or streams.

a. True

b. False

4. Select the correct statement in this list

a. Heavily vegetated lands are less likely to experience flooding

b. Heavily vegetated lands are more likely to experience flooding

c. Wetlands play a key role in increasing the impacts of floods, by acting as a buffer between land and high water levels.

Answer:

2500 Newtons

Explanation:

If force equals the mass × acceleration then all should be quite simple

25kg is the mass of your car

100 m/s/s is the acceleration of you car

25kg • 100m/s/s = 2500 Newtons

Answer:

\(\boxed {\boxed {\sf 2500 \ Newtons }}\)

Explanation:

The formula for force is the product of mass and acceleration.

\(F=m*a\)

The mass of the car is 25 kilograms and the acceleration is 100 meters per square second. So,

\(m= 25 \ kg \\a= 100 \ m/s^2\)

Substitute the values into the formula.

\(F= 25 \ kg * 100 \ m/s^2\)

Multiply.

\(F= 2500 \ kg*m/s^2\)

\(F= 2500 \ N\)

The force of the car is 2500 Newtons.

Answer:

28500

Explanation:

Force equation - F = m * a

F = 950 * 30

F = 28500

Answer:

"Faster" is most likely the answer, I'm not 100% sure though

If a generator supplies 120 v to the primary coil of a transformer of 55 turns. if the secondary coil has 600 turns, then the secondary voltage is 1309.09 volts.

A generator is a machine that converts mechanical energy into electrical energy. It works on the principle of electromagnetic induction, where a coil of wire is rotated in a magnetic field to produce an electric current. Generators are used in a wide variety of applications, including power plants, automobiles, and portable devices such as generators for camping.

The voltage in the primary coil of a transformer is related to the voltage in the secondary coil by the equation:

Vp/Vs = Np/Ns

where Vp is the voltage in the primary coil, Vs is the voltage in the secondary coil, Np is the number of turns in the primary coil, and Ns is the number of turns in the secondary coil.

We can rearrange this equation to solve for Vs:

Vs = (Vp * Ns) / Np

Substituting the given values, we get:

Vs = (120 V * 600) / 55 = 1309.09 V

Therefore, the secondary voltage is 1309.09 volts.

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Answer:

it's 100m/s2

Explanation:

a=f/m

or,a=5/50/1000. (mass si unit is kg and 1kg=1000g

or,a=5/0.005

or,a=100m/s2

Answer:

A , C , E

they are all multiples of 3

Answer:

A form of punctuation that marks the end of a sentence, statement, etc.

Explanation:

. is a period.

It can be used in a sentence, such as this one.

not sure what period you mean, but if you mean in history n stuff: it means a certain era/time something happened. like the "golden age" it's called that because it didn't last forever/ it was just a phase yknow?

Answer:

It indicates that a force has 2 directions at the point at which they cross

Answer:

A. A field pointing in two directions