A man pushes a cart with force of 120-N at an angle of 50 degrees with the ground. If he walks a horizontal displacement of 20-m going to cashier who’s much work is done!

100° C she can expect once the water begins to boil.

Option: B

Explanation:

The boiling point for water at 1 pressure atmosphere of sea level is 212 ° F or 100 ° C. That value isn't a fixed. Water's boiling point is dependent on the ambient pressure, which varies based on elevation. At a lower temperature, water boils as one gains altitude like getting higher on a hill, and boils at a higher temperature if one increases the atmospheric pressure of returning to or below sea level.

It also relies upon the water's purity. Water containing contaminants like salted water boils at a level higher than pure water. This effect is called acceleration of the boiling point and is one of the material's colligative features.

Answer:

option b) 100°

Explanation:

Answer:

Explanation:

Length if the bar is 1m=100cm

The tip of the bar serves as fulcrum

A force of 20N (upward) is applied at the tip of the other end. Then, the force is 100cm from the fulcrum

The crate lid is 2cm from the fulcrum, let the force (downward) acting on the crate be F.

Using moment

Sum of the moments of all forces about any point in the plane must be zero.

Let take moment about the fulcrum

100×20-F×2=0

2000-2F=0

2F=2000

Then, F=1000N

The force acting in the crate lid is 1000N

Option D is correct

Final answer:

The force applied on the crate lid when a 20-N force is applied perpendicularly at the end of a 1-m long pry bar, with the pivot point 2 cm from the crate lid, is 1000 N. This is calculated using the principle of levers.

Explanation:

The question is asking to determine the force applied on the crate lid when using a pry bar as a lever. The system can be analyzed using the principle of moments (or the lever principle), where the force exerted by the lever is calculated based on the force applied and the distances from the fulcrum (the point of rotation).

In the given scenario, a 20-N force is applied perpendicular to the pry bar at a distance of 1 meter from the fulcrum. The fulcrum is inserted 2 cm (0.02 m) away from where the force is applied to the crate lid. To find the force applied on the crate lid (F_crate), we can set up the following proportion based on the principle of levers:

F_applied x distance_from_fulcrum_to_F_applied = F_crate x distance_from_fulcrum_to_F_crate

Using the values from the question
20 N x 1 m =  F_crate x 0.02 m

Solving for F_crate:

F_crate = (20 N x 1 m) / 0.02 m

F_crate = 1000 N

Therefore, the force applied on the crate lid is 1000 N, which corresponds to option (D).

The frequency of bird chirping hear by hiran will be 1.77 kHz.

Explanation:

As per Doppler effect, the observer will feel a decrease in the frequency of the receiving signal if the source is moving away from the observer. So the shifted frequency is obtained using the below equation:

[tex]f'=\frac{c}{c+v_{s} }f[/tex]

Here , c is the speed of sound, Vs is the velocity of source with which it is moving away. f is the original frequency of source and f' is the frequency shift heard by the observer.

As here, f = 1800 Hz, Vs= 6 m/s and c = 343 m/s, then

[tex]f'=\frac{343}{343+6} \times 1800=1.77\ kHz[/tex]

So, the frequency of bird chirping hear by hiran will be 1.77 kHz.

The frequency that Hiran hears, given that a bird is flying away from him and emitting a frequency of 1800Hz, is approximately 1755 Hz. This is calculated using the Doppler Effect formula, as Hiran standing still and the bird moving away equate to a perceived decrease in the frequency of the bird's chirps.

The subject of this question is related to the phenomenon of the Doppler Effect. The Doppler Effect is a change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. In this case, the bird flying away from Hiran represents a source of sound moving away from the observer, which results in a perceived decrease in frequency (pitch) of the sound.

For the scenario provided, we can use the Doppler Effect formula which is: f' = f * (v + vo) / (v + vs), where:

Plugging these values into the formula, we get f' = 1800 Hz * (343 m/s + 0) / (343 m/s - 6 m/s). Simplifying this, we find that the frequency Hiran hears is approximately 1755 Hz.

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Answer:

The vacuum tube was replaced with transistor.

Explanation:

Answer:

-16 kg m/s

Explanation:

Momentum is a vector quantity indicating the "amount of motion" in an object.

The change in momentum of an object is given by:

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

where:

m is the mass of the object

u is its initial velocity

v is its final velocity

For the water balloon in this problem, we have:

m = 0.50 kg is the mass

u = 32 m/s is the initial velocity

v = 0 m/s (since the balloon comes to a stop)

Therefore, the change in momentum is:

[tex]\Delta p=(0.50)(0-32)=-16 kg m/s[/tex]

And the negative sign indicates that the direction is opposite to the initial velocity.

Answer:

4 the sum of chemical and kinetic energy of object

Answer:

The correct answer is "the energy due to the motion or position of objects on a macroscopic scale"

Answer:

Al2O3 + 3Mg ===》 3MgO + 2Al

Explanation:

Reaction of aluminium oxide with magnesium metal would form magnesium oxide and aluminium metal.

Balancing the stoichiometric equation, the number of atoms at the reactant must be equal to the number of atoms at the product so that law of conservation of matter must hold.

Al203 + 3Mg ====》 3MgO + 2Al

2 aluminium at reactant = 2 aluminium at product

3 oxygen at reactant = 3 oxygen at product

3 magnesium at reactant = 3 magnesium at product.

letter a because 4N to the left +3N to the right = 4N left minus 3N left as you change the direction of 3N then you also change the plus into minus. the direction will always favour to which of the direction is bigger

The couch will move to the left with a net force of 1 N, as the 4 N force to the left is greater than the 3 N force to the right. This is assuming that the applied force is sufficient to overcome the frictional force that may keep the couch stationary.

The situation described in the question involves two forces acting in opposite directions on an object, which in this case is a couch. When one person pushes to the right with a force of 3 N and another person pushes to the left with a force of 4 N, the net force on the couch can be determined using the principles of Newton's second law. To find the net force, we subtract the smaller force from the larger force, giving us an overall force of 1 N to the left. Therefore, the correct answer is (a) the couch will move to the left with a force of 1 N.

However, it's important to note that actual movement depends on whether the force applied exceeds the frictional force acting on the couch. In the scenario provided, without additional information about the frictional force, we cannot definitively say that the couch will move. If the net force is sufficient to overcome static friction, then the couch will begin to move to the left. But if the frictional force is greater than the net force applied, the couch will remain stationary.

Answer:

Gravitational force

Explanation:

Gravitational force is a force that attracts any two objects with mass.

Answer:

Yes they do

Explanation:

All waves (both transverse and longitudinal) transfer energy from one point to another.

(e.g think about sound waves (longitudinal) and light waves (transverse))

Answer: Yes

Explanation: The law of conservation of mass explains that the mass of the products in a chemical reaction must equal the mass of the reactants. The law of conservation of mass is useful for a number of calculations and can be used to solve for unknown masses, such the amount of gas consumed or produced during a reaction.

Answer:

because there are the same number of atoms of each element shown on both sides

Explanation:

i did the usa test prep

Answer:

mass

Explanation:

Answer:

The time needed for energy to reach 100J is 16.7s

Explanation:

Using the formula, P=V×I and P=Q/t where I is current and Q is energy :

500mA = 0.5A

P = 0.5 × 12

= 6W

6 = 100/t

t = 100/6

= 16.7s

Answer:

The correct answers are "chemical energy into electrical energy" and then "the electrical energy into light energy". Explanation: In the battery-powered flashlight, the battery supplies the chemical energy which makes the electrons to flow in the circuit and constitutes the current

Explanation:

ANOTHER RUNNING DOG

Explanation:

In the given question it is to find a suitable reference point to describe  the motion of dog. Here I could suggest that it is better to compare the dog with  another running dog to create the relative speed difference to get a reliable motion variation.

Because the motion of dog is in the linear with respect to the another dog and to the acceleration produced by the dog in the required interval is easy to calculate with respect to  another dog which is already in motion.

Hence, I suggest that Motion of dog can be analysed better by analyse the motion variation of dog with  another dog running.

The correct option is b. another dog running.

The following information should be considered:

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Answer:

the answer is letter d because both of them are pushing the couch in the same direction so 4 plus 2 will give you 6N

Answer:

16 m

Explanation:

For an object in uniformly accelerated motion (=with constant acceleration), the distance covered by the body can be found by using the following suvat equation:

[tex]s=ut+\frac{1}{2}at^2[/tex]

where

s is the distance covered

u is the initial velocity

t is the time

a is the acceleration

For the body in this problem,

u = 0 (it starts from rest)

[tex]a=2 m/s^2[/tex] is the acceleration

Substituting t = 4 s, we find the distance covered:

[tex]s=0+\frac{1}{2}(2)(4)^2=16 m[/tex]

Answer:

6.75×10^13N

Explanation:

The electric force between the charges can be determined using coulombs law which states that 'the force of attraction between two charges is directly proportional to the product of the charges and inversely proportional to the square of their distance between them.

Mathematically, F = kq1q2/r² where;

q1 and q2 are the charges

r is the distance between the charges

F is the force of attraction

k is the coulombs constant

Given q1 = 5C q2 = 15C r = 10cm = 0.1m k = 9×10^9Nm²/C²

Substituting the given values in the formula we have;

F =9×10^9×5×15/0.1²

F = 6.75×10^11/0.01

F = 6.75×10^13N

Therefore the electric force between them is 6.75×10^13N

The ball will continue its motion with same speed and along same direction on account of its inertia. Hence, option (C) is correct.

We can consider Newton's Law of inertia here to explain the given problem. Newton's law of inertia or Newton's first law says that, "If any object is in motion such that there is no external force is applied on it. So, it will continue to be in motion, until any force cause it to stop". This simply means that nothing moves without force and nothin stops without force.

Now consider the given case, where we are free from all the gravitational and frictional influences, such that on throwing the baseball with some speed, the ball will continue to move with same speed and in the same direction, until something struck its path.

Here stuck by the path means a force, therefore force can only cause the ball to stop or to change its direction.

Thus, we can conclude that the ball will continue its motion with same speed and along same direction on account of its inertia.

Learn more about the Newton's first law here:

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A pulley is another sort of basic machine in the lever family. We may have utilized a pulley to lift things, for example, a banner on a flagpole.

Explanation:

The point in a fixed pulley resembles the support of a lever. The remainder of the pulley behaves like the fixed arm of a first-class lever, since it rotates around a point. The distance from the fulcrum is the equivalent on the two sides of a fixed pulley. A fixed pulley has a mechanical advantage of one. Hence, a fixed pulley doesn't increase the force.

It essentially alters the direction of the force. A moveable pulley or a mix of pulleys can deliver a mechanical advantage of more than one. Moveable pulleys are appended to the item being moved. Fixed and moveable pulleys can be consolidated into a solitary unit to create a greater mechanical advantage.

Answer:Why does coil have to spin in a generator?

Explanation: because when the coil spin it creates speed  and conducts eletriced

Answer:

Explanation:

The moving charged particles in an electric current are called charge carriers. In metals, one or more electrons from each atom are loosely bound to the atom, and can move freely about within the metal. These conduction electrons are the charge carriers in metal conductors.

The flow of electrons in a direction is known as electric current. The tendency of attraction between the positive and negative charges makes electric current flow through a wire

An electrical charge, being either positive or negative, is a property that causes particles to experience force within an electric field. Electric current is the flow of these charges, driven by voltage sources such as batteries, across conductive materials. The current's strength is influenced by the applied voltage and the material's resistivity.

What is Electrical Charge and How Does it Create Electrical Current?

Electrical charge is a fundamental property of particles that causes them to experience a force when placed in an electric field. There are two types of charge, positive and negative, and like charges repel each other while opposite charges attract. This concept of charge is crucial in explaining how electric currents are created and maintained.

An electric current is the rate of flow of electric charge through a conductor, such as a wire. In metals, the charge carriers are primarily electrons, which are negatively charged particles that move through the metal's lattice when a potential difference (voltage) is applied across the conductor. This movement of charge constitutes the electric current.

Devices like batteries and generators create a potential difference in a circuit, and consequently an electrical field, which pushes the free charges to move. The amount of current that flows depends on both the voltage applied and the resistivity of the material through which charges are moving. Resistivity is a measure of how strongly a material opposes the flow of electric current, and it varies from material to material.

In different mediums, various charged particles may carry the current. In our bodies, for instance, current is carried by ions such as sodium ions (Na+), while in metal wires, it is carried by electrons. The existence of an electric current is fundamental to our technology, as it powers everything from simple torches to complex electric trains and computers, and even the neuronal activities in our brains.

Charges are responsible for creating electric fields, which can attract or repel other charges depending on their polarity. Positive charges are sources of electric fields, while negative charges act as sinks. It is this interplay between charges and electric fields that permits the generation and control of electric currents, leading to our ability to harness electricity for countless applications.

Answer:

When a particle or a system of particles move in a system where no external force acts, then the total linear momentum of the particle system remains constant.

Explanation:

Given data:

Total mass of the skateboarder, [tex]m_{1} = 70 \ kg[/tex]

Mass of the friend, [tex]m_{2} = 50 \ kg[/tex]

Initial velocity of the skateboarder, [tex]u_{1} = 3 \ m/s[/tex]

Initial velocity of the the friend, [tex]u_{2} = 0[/tex]

Let the new velocity of the skateboarder when his friend jumps be [tex]v[/tex].

From the conservation law of linear momentum,

[tex]m_{1}u_{1} + m_{2}u_{2} = (m_{1} + m_{2})v[/tex]

[tex]70 \times 3 + 50 \times 0 = (70 + 50)v[/tex]

[tex]\Rightarrow \ v &= 1.75 \ m/s.[/tex]

Answer:

a) 17 km

b) 9 km

Explanation:

The distance is the length of the path.

A to C: 5 km

B to C: 4 km

C to B: 4 km

B to C: 4 km

Total distance = 5 km + 4 km + 4 km + 4 km = 17 km

Displacement is the difference between the starting point and ending point.

Displacement = 9 km − 0 km = 9 km

Answer:

Familiarize

Explanation:

'Familiarize' is not a typical step in the scientific method. The steps usually include Observation, Question, Hypothesis, Experiment, Analyze, and Conclusion.

Among the given options, C. Familiarize is not one of the steps in the scientific method. The scientific method, commonly used in scientific research, follows a series of steps:

. While 'Summarize' may seem unusual, it can be considered part of the conclusion stage, where the results of the experiment are summarized. 'Familiarize' is not a typical step in this process.

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Answer:

[tex]2.19\cdot 10^{13}[/tex]

Explanation:

The electron is a fundamental particle, with a charge of

[tex]e=-1.6\cdot 10^{-19}C[/tex]

which is also known as fundamental charge.

For an object having N excess electrons, the total charge on the object is

[tex]Q=Ne[/tex] (1)

where e is the charge of the electron.

For the object in this problem, its charge is

[tex]Q=+3.5\cdot 10^{-6} C[/tex]

This can be obtained by removing a negative charge equal to

[tex]Q=-3.5\cdot 10^{-6}C[/tex]

Substituting into (1) and solving for N, we can find the number of electrons:

[tex]N=\frac{Q}{e}=\frac{-3.5\cdot 10^{-6}}{-1.6\cdot 10^{-19}}=2.19\cdot 10^{13}[/tex]

Answer:

Explanation:

momentum is written as p

p = mass * velocity

p = mv

30 km per hr = 30 * 1000 meters per 3600 seconds

velocity = 30000 meters per 3600 seconds

p = mv

p = 75 * 30000 / 3600

p = 625 kilogram per meter second

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The momentum of an adult female weighing 75 kg and riding a bicycle at 30 km/h (8.33 m/s) is 625 kg·m/s.

To calculate the momentum of an adult female riding a bicycle, we use the formula for linear momentum, which is momentum (p) = mass (m) × velocity (v). First, we need to convert the velocity from kilometers per hour (km/h) to meters per second (m/s) since the standard unit for velocity in physics is m/s. The conversion is as follows: 30 km/h = 30 × (1000 m/3600 s) = 8.33 m/s. The mass of the adult female is given as 75 kg.

Therefore, the momentum of the adult female riding a bicycle is:

p = m × v = 75 kg × 8.33 m/s = 625 kg·m/s.

Answer:

Albert Einstein and issac Newton

Explanation:

Answer:

a and d

Explanation:

edge 2021

The weight of the African elephant is 58,800 Newtons.

Explanation:

Step 1:

Mass of the African Elephant = 6000 Kg

We need to find the weight of  African elephant in Newton.

Step 2 :

Weight in Newtons = Mass of the object ×  acceleration due to gravity (g)

We know that value of  g is 9.8 m/sec²

Hence the required weight = 6000 × 9.8 = 58,800 Newtons

The height of the elephant can reach 4 m. But the weight of any object is nit dependent on the height and hence this information is not required to compute the weight.

Step 3 :

Answer :

The weight of the African elephant is 58,800 Newtons.

The weight of the elephant is 58,800 N.

Explanation:

Weight in Newtons (N) can be found by multiplying mass which is measured in kilograms (kg) and acceleration due to gravity that has a constant value of 9.8 m/s².

Weight = mass of the elephant × acceleration due to gravity

             = 6000 kg × 9.8 m/s²  

             = 58,800 kg m/s² or Newton.

So the weight of the elephant is 58,800 N. Here the height of the elephant doesn't required in the calculation of the weight of the elephant.

Answer:

Time, t = 28.22 s.

Explanation:

Given data:

Power, [tex]P = 1750 \ \rm W[/tex]

Mass, [tex]m = 315 \ kg[/tex]

Height, [tex]h = 16.0 \ m[/tex]

Let the time required to lift the piano to 16.0 m above be t.

We know that,

[tex]P = \frac{W}{t}[/tex]

[tex]P = \frac{mgh}{t}[/tex]

[tex]\Rightarrow \ t = \frac{mgh}{P}[/tex]

[tex]t = \frac{315 \times 9.80 \times 16.0}{1750}[/tex]

[tex]t = 28.22 \ s.[/tex]

It will take the motor 28.224 seconds to lift the piano to the sixth-story window.

Given the following data;

We know that acceleration due to gravity is equal to 9.8 m/s².

To find how long it will take to lift the piano to the sixth-story window;

First of all, we would have to determine the gravitational potential energy required to lift the piano up.

Mathematically, gravitational potential energy is calculated by using the formula;

[tex]G.P.E = mgh[/tex]

where:

Substituting into the formula, we have;

[tex]G.P.E = 315 \; * \; 9.8 \; * \; 16[/tex]

G.P.E = 49,392 Joules

Next, we would determine the time using the following formula;

[tex]Time = \frac{Energy}{Power}[/tex]

Substituting the values into the formula, we have;

[tex]Time = \frac{49392}{1750}[/tex]

Time = 28.224 seconds

Therefore, it will take the motor 28.224 seconds to lift the piano to the sixth-story window.

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