You use a pulley system to lift a fallen tree . You apply a force of 50 N and the pulley pulls on the tree with a force of 1300 N what is the mechanical advantage of the pulley ?

Answer:

2.7 m/s²

Explanation:

Average acceleration is change in velocity over change in time.  Assuming the acceleration is constant, we can say it is equal to the average:

a = Δv / Δt

a = (6.0 m/s - 0 m/s) / 2.2 s

a ≈ 2.7 m/s²

Force is given by m*a

thus

4.719/33 = 0.143 kg

that's 143 grams

Answer:

≅6.5Ω

Explanation:

In the series resistor circuit, the electric current flows only one path. In the parallel resistor circuit, the current divides and circulates through several paths. These resistances are joined by their two extremes.

The equivalent resistance of a resistor circuit in parallel is equal to the reciprocal of the sum of the inverse of the individual resistors.

For the general case with "n" resistances in parallel the formula is:

[tex]\frac{1}{R_{n} }=\frac{1}{R_{1}}+ \frac{1}{R_{2}} +\frac{1}{R_{3}}+....\frac{1}{R_{n} }[/tex]

Solving for R1 = 7ohm and R2 = 93ohm

[tex]\frac{1}{R_{n} }=\frac{1}{7ohm}+ \frac{1}{93ohm}}[/tex]

[tex]\frac{1}{R_{n} }=0.143ohm+0.011ohm\\\frac{1}{R_{n} }=0.154ohm\\R_{n}=\frac{1}{0.154} ohm\\R_{n}=6.503ohm[/tex]

.

Answer:

[tex]9.3\cdot 10^{37}[/tex]

Explanation:

Power is defined as the energy produced (E) per unit of time (t):

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

This means that the energy produced in the Sun each second (1 s), given the power [tex]P=4.0\cdot 10^{26}W[/tex], is

[tex]E=Pt=(4.0\cdot 10^{26}W)(1s )=4.0\cdot 10^{26} J[/tex]

Each p-p chain reaction produces an amount of energy of

[tex]E_1 = 4.3\cdot 10^{-12} J[/tex]

in order to get the total number of p-p chain reactions per second, we need to divide the total energy produced per second by the energy produced by each reaction:

[tex]n=\frac{E}{E_1}=\frac{4.0\cdot 10^{26} J}{4.3\cdot 10^{-12} J}=9.3\cdot 10^{37}[/tex]

Answer:

The number above the symbol is the atomic mass (or atomic weight). This is the total number of protons and neutrons in an atom. The number below the symbol is the atomic number and this reflects the number of protons in the nucleus of each element's atom. Every element has a unique atomic number.

Explanation:

Answer:

B, C and E

Explanation:

The unit of resistance in the international system is the Ohm, the equation that describes the resistance is:

[tex]R=p\frac{l}{S} \\[/tex]

Where (l) is for lenght of the wire, (S) is the area and (p) its the constant associated to the conductor.

It's related by the Ohm's Law:

[tex]R=\frac{V}{I}[/tex]

Resistance, measured in ohms, refers to the opposition of the flow of electric charge in a conductor. It is not the excess accumulation of electric charge, nor is it measured in amps. Resistance is related to voltage and current as per Ohm's Law.

Resistance, in the context of Physics, is the opposition to the flow of electric charge through a conductor. It can be thought of as electrical friction that resists the flow of charge, akin to how physical obstructions can slow down the flow of water. Resistance is typically measured in units called ohms and is symbolized by the Greek letter Omega (Ω). It's not the excess accumulation of electric charge, as stated in option A.

Ohm's Law, named after the German physicist Georg Simon Ohm, relates resistance to voltage and current. It states that the current passing through a conductor between two points is directly proportional to the voltage across the two points when the temperature remains constant. Mathematically, it is expressed as V = IR, where V is the voltage in volts, I is the current in amps, and R is the resistance in ohms.

Therefore, the statements B, C, and E are true about resistance. It is not measured in amps (option D); current is measured in amps. The resistance of a component can be determined using an ohmmeter, and the equivalent resistance of a circuit depends on how resistors are connected within the circuit (in series, parallel, or a combination of both).

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Answer is .... A I think

Answer:

D. Most substances will contract

Explanation:

I took the test; this is the correct answer (:

I think flat surface mirrors are also just called plane mirrors. One way to tell even if you don't know that this is the answer is by knowing that flat mirrors have "planar reflective surfaces"

Answer:

The correct answer is option C.

Explanation:

The layer below the lithosphere , the upper layer of the mantle of the earth with high heat pressure .It is made up of almost solid rocks but also flows not which indicates that it consist of viscoelastic fluid of molten rocks.This is because in some regions there can be presence of molten rocks.

Answer:

C.

Explanation:

Answer:

Wouldn't it be the muscles in your arms or legs since they have to push the most while they have gravity acting upon them?

Explanation:

Respiration and Circulation

Hope that helped

It's called geothermal energy, and is present due to the incredible amount of heat present in Earth's interior from radioactive decay, friction, and residual heat from Earth's formation.

Answer: Yeast produces carbon dioxide

Explanation: Yeasts feed on the sugars in flour and releases the carbon dioxide that makes bread rise.

Answer:

Carbon Dioxide

Explanation:

Bread dough rises because yeast produces Carbon Dioxide.

Carbon Dioxide causes the yeast to rise in the dough because Carbon Dioxide fills p any space. The dough rises because the Carbon Dioxide fills the extra space in the dough, causing the dough to get big and fluffy, aka rise.

Mordancy.

Answer:

The magnetic force of the magnet can only be used so much

If the magnet is covered with paper clips it can not pick up more

Explanation:

Final answer:

The student cannot lift all paper clips because the magnet's force has limited range and intervening materials can reduce its effectiveness. Some paper clips may also stick together after being magnetized, exceeding the magnet's lifting capacity.

Explanation:

The student cannot pull all the paper clips out of the box because the magnetic force of the magnet has a limited range, and not all paper clips are within that range. Additionally, if other materials are placed between the magnet and the paper clips, like paper or wood, they may reduce the magnetic attraction. Moreover, the magnetization of the paper clips through contact with a magnet can cause some of them to stick together, thereby increasing the effective weight beyond the lifting capacity of the magnet used by the student.

Experiencing magnetic forces like attraction or repulsion among paper clips demonstrates the behavior of bar magnets which, based on their ends being north or south poles, can either attract or repel each other. This principle is also evident in other experiments where materials are used to see how they influence magnetic forces, such as using a metal ruler to attract paper clips after rubbing it with a magnet, indicating induced magnetization.

Answer:

45 V

Explanation:

The voltage across the resistor can be found by using Ohm's law:

[tex]V=RI[/tex]

where

R is the resistance

I is the current

In this circuit,

[tex]R=3 \Omega[/tex]

[tex]I=15 A[/tex]

Therefore, the voltage across the resistor is

[tex]V=(3\Omega )(15 A)=45 V[/tex]

Voltage = (current) x (resistance)   <== memorize this formula

Voltage = (15 Amperes) x (3 ohms)

Voltage = 45 volts

Answer:

1.3 m/s², 210 m

Explanation:

Average acceleration is change in velocity over change in time.

First, convert to SI units.

30. mph ≈ 13.4 m/s

60. mph ≈ 26.8 m/s

a = Δv / Δt

a = (26.8 m/s - 13.4 m/s) / 10.5 s

a = 1.28 m/s²

Rounded to 2 sig-figs, your acceleration is 1.3 m/s².

The distance traveled is:

x = x₀ + ½ (v + v₀)t

x = (0 m) + ½ (26.8 m/s + 13.4 m/s) (10.5 s)

x = 211 m

Rounded to 2 sig-figs, you and your date traveled 210 m.

Final answer:

The acceleration of the car was approximately 1.27728 m/s², and the distance traveled during the acceleration was approximately 211.69242 meters.

Explanation:

To calculate the acceleration, we can use the formula:

a = (Vf - Vi) / t

Where Vf is the final velocity, Vi is the initial velocity, and t is the time. Plugging in the values given, we get:

a = (60 mi/hr - 30 mi/hr) / 10.5s

To make the units consistent, we should convert the velocities from miles per hour to meters per second. Since 1 mi/hr is approximately equal to 0.44704 m/s, after conversion we get:

a = (26.8224 m/s - 13.4112 m/s) / 10.5s = 1.27728 m/s²

To find the distance traveled during acceleration, we use the formula:

d = Vi*t + 0.5*a*t²

Substituting the known values, we find:

d = 13.4112 m/s * 10.5s + 0.5 * 1.27728 m/s² * (10.5s)² = 140.8176 m + 70.87482 m

The total distance traveled by your date during the acceleration is approximately 211.69242 meters.

Answer:

Earthquakes

Explanation:

A Transform boundary is a fault that occur when two  tectonic plates slide sideways past each other.During the rubbing process, huge portions of rocks on both plates break to create fault lines resulting into earthquakes.The San Andrea Fault is was formed through a similar process.

Using more wire loops

Answer:

using more wire loops.

Explanation:

When there is a change in magnetic flux linked with a coil changes, an emf is induced in the coil. This phenomenon is called electromagnetic induction.

the amount of induced emf developed is

[tex]e = \frac{d\phi }{dt}[/tex]

If there are N number of turns in the coil, then induced emf is given by

[tex]e = N\frac{d\phi }{dt}[/tex]

Induced current is given by

i [tex]i = \frac{e }{R}[/tex]

So, as number of turns increases, the current produced is also increases.

Answer:

its 5

Explanation:

Chemical change shows the change in the chemical composition during an experiment. Seth observed 5 signs of chemical changes during the experiment.

when a substance reacts chemically with another substance in order to form a new substance causes decomposition of that substance into two or more substances. The following reaction only takes place due to certain changes during the reaction known as chemical change.

Seth observes signs as follows

The burner is lighting.

The condensation appeared on the top of the test tube.

A  smell was coming from the tube.

There is a light a wooden splint occurs.

when he lit the wooden splint it was immediately extinguished.

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Answer: The first ray diagram

Explanation:

A convex lens is thicker in the center than at its edges and concentrates (converges) at a point the rays of light that pass through it.

Now, the lens shown in the image is a biconvex lens, which is still convergent.

For the specific case in which the object is positioned between the focus F and point 2F, the image produced will be real and inverted.

With real image means that it can be projected on a screen if it is placed just where the rays converge after passing through the lens.

Then, the option that is closest to this fact is the first figure.

Answer:

A the first one

Answer:

D)   Some of the light passes through, and some of the light is absorbed or scattered by the object.

Explanation:

When light strikes translucent materials, only some of the light passes through them. The light does not pass directly through the materials. ... When light strikes an opaque object none of it passes through. Most of the light is either reflected by the object or absorbed and converted to heat.

(I googled it) ☺

Answer:

D

Explanation:

Its the answer on my usatestprep

Answer:

An object in equilibrium has a net force of zero  

Static equilibrium describes an object at  rest having equal and balanced forces acting upon it.

Dynamic equilibrium describes an object in  motion having equal and balanced forces acting upon it.

Explanation:

An object is said to be in equilibrium when a net force of zero is acting on it. When this condition occurs, the object will have zero acceleration, according to Newton's second law:

[tex]F=ma[/tex]

where F is the net force, m the mass of the object, a the acceleration. Since F=0, then a=0. As a result, we have two possible situations:

- If the object was at rest, then it will keep its state of rest. In this case, we talk about static equilibrium.

- If the object was moving, it will keep moving with constant velocity. In this case, we talk about dynamic equilibrium.

An object in equilibrium has a net force of zero. In static equilibrium, the object is at rest, and the forces acting on it are balanced, resulting in no net force.

Dynamic equilibrium describes an object in motion with a constant velocity. In this state, the object is moving at a constant speed in a straight line, and the forces acting on it are balanced. Similar to static equilibrium, the net force acting on the object is zero.

Both static equilibrium and dynamic equilibrium require the forces acting on the object to be balanced, resulting in a net force of zero. The difference lies in whether the object is at rest or moving at a constant velocity.

Therefore, A subject in equilibrium experiences no net force.

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Answer:

B

Explanation:

When a star dies, it is most likely to help create a star, therefore the correct answer is option B

Chandrasekhar's limit is a type of maximum limited value that is used to define the maximum mass of a white dwarf star. The generally internationally considered value of the Chandrasekhar limit is about 1.44 times the mass of the sun which is approximately 2.765×10³⁰ kg.

In other words, one can say that the Chandrasekhar limit is the maximum value that can attain 1.44 times the solar mass.

A high-mass star expands and transforms into a red supergiant when it runs out of gas to burn. The supergiant stars, known as supernovae, obliterate themselves in a tremendous explosion while the majority of stars slowly fade away. Massive star deaths can result in the formation of new stars.

Thus, The correct response is option B because when a star dies, it most likely contributes to the creation of another star.

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Answer:

125 m/s

Explanation:

95 is just a measurement of length, depth, or width

You can't go -35.2 m/s

For this case we have by definition, that the speed is a scalar quantity that determines the relation of the distance traveled by a body or object and the time it needs to cover said distance.

So:

ANswer:

Option B

Answer:

organ system

Explanation:

An organ system is a group of organs that work together to perform a common function.

The correct answer is an Organ System

You're talking about a grain of sand or a stone or a rock that's drifting in space, and then the Earth happens to get in the way, so the stone falls down to Earth, and it makes a bright streak of light while it's falling through the atmosphere and burning up from the friction.

-- While it's drifting in space, it's a meteoroid.

-- While it's falling through the atmosphere burning up and making a bright streak of light, it's a meteor.

-- If it doesn't completely burn up and there's some of it left to fall on the ground, then the leftover piece on the ground is a meteorite.

Answer:

Microwaves

Explanation:

Microwaves are electromagnetic waves with wavelengths longer than those of terahertz (THz) wavelengths, but relatively short for radio waves. this is why a cell company would use microwaves to provide service

hope this helps!

Answer:

Drug abuse is best defined as the nonmedical or improper use of a drug that can interfere with a healthy life.

For example, a person that is addicted to cocaine will use it everyday, and will develope agressive behavior, anxiety, sleep disorder, paranoia etc.

This person could get addicted at the point of comiting a robbery, killing and much more.

Drug abuse is best defined as the nonmedical or improper use of a drug that can interfere with a healthy life.

Hence, the correct option is C.

Drug abuse is best defined as the nonmedical or improper use of a drug that can interfere with a person's physical, psychological, and social well-being.

It involves using drugs for purposes other than their intended medical use or using drugs in excessive amounts or frequency, which can lead to addiction, health problems, and negative consequences in various aspects of life.

Drug abuse can involve both legal and illegal drugs and is a significant public health concern worldwide.

Therefore, Drug abuse is best defined as the nonmedical or improper use of a drug that can interfere with a healthy life.

Hence, the correct option is C.

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Answer:

Opposite

Explanation:

if you put 20 lbs of force into the swing then 20 lsb of force is put into the ball and the bat so think of it as two balls being thrown at each other at the same speed they will hit each other and stop because the force cancels out

i hope this helps and sorry if im wrong

If a bat hits a ball and sends it in one direction, the bat will be accelerated in the opposite direction. This is based on Newton's third law of motion which states that for every action, there is an equal and opposite reaction.

The laws of physics state that for every action, there is an equal and opposite reaction. This is known as Newton's third law. If the action force of a bat striking a ball accelerates the ball in one direction, the reaction force accelerates the bat in the opposite direction. This means that if the bat propels the ball to the left, the bat would be driven to the right and vice versa. This is why a players' hand can feel a sting or shock when hitting a baseball, which is the bat being accelerated in the opposite direction by the reaction force.

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Answer:

23.3 g/cm3

Explanation:

First of all, this should be in the math section. I just so happen to also be good at math. Cheers!

We have that for the Question "a platinum bar measures 5.0 cm long, 4.0 cm wide and 1.5 cm thick. it has a mass of 700.0 grams" it can be said that The density of the platinum bar is

[tex]\rho=23.33g/cm^3[/tex]

From the question we are told

a platinum bar measures 5.0 cm long, 4.0 cm wide and 1.5 cm thick. it has a mass of 700.0 grams

Generally the equation for the density  is mathematically given as

[tex]\rho=\frac{m}{V}\\\\Therefore\\\\\rho=\frac{m}{V}\\\\\rho=\frac{700}{5*4*1.5}\\\\[/tex]

[tex]\rho=23.33g/cm^3[/tex]

Therefore

The density of the platinum bar is

[tex]\rho=23.33g/cm^3[/tex]

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