Physics High School

Which of the following is a compound machine?

a,a ramp

b, a wheel and axle

c, a pulley

d, a pair of scissors

Answers

Answer 1

Option (d) is correct. A pair of scissors is a compound machine.

Further Explanation:

A machine is a device that is used to reduce the human effort and obtain much more output as compared to the input given. A simple lever that is used to lift a load is also a machine as it reduces the human effort.

A simple machine is a machine that has only one machine. For example, a ramp is an inclined plane that helps to cover a height easily. A lever is also a simple machine that is used to multiply the effort to pick up the heavier loads.

A ramp, a wheel and axle and a pulley all are the simple machines. They have only one simple machine in them whereas a pair of scissors is not a simple machine as it has more than one machine in it.

Thus, Option (d) is correct. A pair of scissors is a compound machine.

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Answer Details:

Grade: Middle School

Chapter: Machines

Subject: Physics

Keywords: Simple machine, compound machine, ramp, wheel and axle, pair of scissors, human efforts, lever, inclined plane.

Answer 2

The Compound machines from the given options is a pair of scissors.

The correct option is D.

Compound machines are mechanical devices composed of two or more simple machines working together to perform a specific task. These machines leverage the principles of simple machines, such as levers, pulleys, and gears, to multiply or redirect force, making it easier to perform work. Compound machines can be found in various applications, from complex industrial machinery to everyday tools like bicycles and cars. They illustrate the concept that combining simple machines can enhance mechanical efficiency and enable humans to accomplish tasks that would otherwise be challenging or impossible.

The compound machine from the given options is a pair of scissors.

A compound machine is a combination of two or more simple machines, which are devices that make work easier by reducing the required force or changing the direction of force. In the case of scissors, they consist of a lever and a wedge. The handles of the scissors act as a lever, while the blades function as wedges.

Therefore, option d, a pair of scissors is the correct answer.

Hence The correct option is D.

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Related Questions

PLEASE HELP ASAP :|

In a complete sentence using all keywords below, describe how you can charge a balloon and have it stick to the wall?

Keywords: wool/felt/hair,, balloon, electrons, wall, negative charge, and positive charge.

Make sure to use all keywords correctly for 6 points.

Answers

Rub a balloon on a woolen fabric to pick up some electrons, to make the balloon negatively charged, and stick them to a wall, which would be positively charged to make them stick. 

Opposites attract and when you stick a negatively charged objects to positively charged objects, they tend to stick together. When you pick up electrons, it increases the number of electrons which will make the object negatively charged. 

Note: The first part of the answer is a single sentence. The problem says in a complete sentence, so just in case that you need only one sentence you can take the first part. If you can add in more than a sentence, you can put in more from the second paragraph. 

A driver in front of you is signaling with his or her hand and arm pointing upward this driver wants to

Answers

Go straight. The man wants to go straight on the road.

what is the spring constant of a bungee cord that stretches an additional 28m when 300 n of force are applied

Answers

The magnitude of the force applied to the spring is equal to (Hook's law)
[tex]F=kx[/tex]
where k is the constant of the spring and x is the displacement of the spring with respect to its relaxed position.
In the exercise, the force applied is F=300 N while the displacement is x=28 m. Therefore the spring's constant is
[tex]k= \frac{F}{x}= \frac{300 N}{28 m}=10.7 N/m [/tex]

the combination of all forces acting on an object is called _____.

Answers

The answer is net force akaskakska

English help please
The last answer says archer

Answers

it's the letter A it demonstrates...
it is the first answer
hope this helps!!!

Make the following conversion.

45 m = ____ cm

4500
0.45
450
0.045

Answers

1 m = 100 cm so...

[tex]45 m * \frac{100 cm}{1 m} = 4500 cm[/tex]
It is 4500 cm. 

I m equal to 100 cm and 45 m is 4500 cm

The final phase of the order cycle is called order ____.

Answers

The final phase of the order cycle is called order delivery. 

A strong magnetic field surrounds earth. How does earths magnetic feild help humans?

Answers

Answer:

Earth's magnetic field deviates high energy particles (e.g cosmic rays) that are a risk for human health.

Explanation:

Cosmic rays are high energy charged particles (88% protons, 10% nuclei of helium, 1% heavier nuclei) that came from the outer space. The energies of these particles are in the range of 1 GeV to 10⁸ TeV. Since they are charged particles, they will be deviated by Earth’s magnetic field¹ (as a reminder: A magnetic field applies a magnetic force over a moving charged particle).

Earth’s magnetic field works as a shield to humans against high energy charged particles, if cosmic rays were in touch with a human body, it can break molecules that forms DNA structure². Modifying that structure can lead to diseases as cancer, for example.

Units:

GeV: Giga-electronvolt

TeV: Tera-electronvolt

¹Magnetic field: It is generated around the space of a moving charged particle.

²DNA structure: It is a compound of different molecules that provides information to cells functionality.

The temperature differences seen between quito, ecuador, and guayaquil, ecuador, illustrate the effect of _____. ocean currents cloud cover altitude

Answers

The answer would be altitude. 
Quito has the altitude of  2.850m, while Guayaquil has the altitude of 5m.
This can lead to the vast difference in climates.
The most noticeable difference is that temperature drop with increased altitude.
For each 1,000 foot rise in altitude, there is a 4°F drop in temperature.

This one has got to be the altitude.

Help please

Water is a compound because it (1 point)
• can be broken down into simpler substances.
• always has two hydrogen atoms for each oxygen atom.
• is made of water atoms joined together.
• both a and b



Which of the following is a heterogeneous mixture? (1 point)
• water in a swimming pool
• sugar water
• a jar of mixed nuts
• stainless steel,

Answers

Water is a compound because: It can be broken down into simpler substances Chemical compound: a substance formed from two or more elements chemically united in fixed proportions. A jar of mixed nuts is a heterogeneous mixture. A heterogeneous mixture is a mixture that is not uniform in composition – it's a non-uniform mixture of smaller constituent parts.

A soccer ball is kicked with an initial speed of 8.8 m/s. After 0.179 s it is at its highest point. What was its initial direction of motion?,

Answers

To solve the problem we can consider only the motion on the vertical direction (y-axis). Let's the take upward as positive direction, such that the acceleration of the motion (the gravitational acceleration) is negative: [tex]g=-9.81 m/s^2[/tex], because it is against the direction of the motion.
The initial speed of the ball on the y-axis is [tex]v_0 \sin \alpha[/tex], where [tex]v_0 = 8.8 m/s[/tex] and where [tex]\alpha [/tex] is the angle of the initial velocity v0 with respect to the horizontal, so it's the direction that we want to find.

The law of the velocity on the y-axis is:
[tex]v(t)=v_0 \sin \alpha + gt[/tex]
Where t is the time. At its highest point, the vertical velocity of the ball is zero, and this occurs when t=0.179 s: [tex]v(0.179 s)=0[/tex]. So we can write:
[tex]v(0.179 s)=v_0 \sin \alpha + gt=0[/tex]
And substituting the numbers we can find the value of the angle:
[tex]\sin \alpha = \frac{-gt}{v_0}= \frac{-(-9.81 m/s^2)(0.179 s)}{8.8 m/s}=0.20 [/tex]
[tex]\alpha = \arcsin (0.20)=11.5 ^{\circ}[/tex]

The potential difference in a simple circuit is 9 v and the resistance is 47 ω . what current flows in the circuit? answer in units of
a.

Answers

The current flowing in the circuit with a potential difference of 9 volts and resistance of 47 ohms is approximately 0.1915 amperes (A), calculated using Ohm's Law (I = V/R).

The current that flows through a circuit can be calculated using Ohm's Law, which is given by the formula V = IR, where V is the potential difference, I is the current, and R is the resistance. In this case, the potential difference is 9 volts (V) and the resistance is 47 ohms (Ω). To find the current, we rearrange the formula to I = V/R.

Substitute the given values into the formula:

I = 9V / 47Ω

I ≈ 0.1915 A

So the current flowing in the circuit is approximately 0.1915 amperes (A).

Select all that apply. A hypothesis is _____. always correct determined before experimentation begins the experimental factor that changes in response to a change in the independent variable testable and falsifiable

Answers

Final answer:

A hypothesis is a testable and falsifiable assumption known before experimentation. It's not always correct and does not always change in response to a change in the independent variable. Even when experiments support a hypothesis, it is not confirmed as absolutely correct.

Explanation:

A hypothesis is a testable and falsifiable assumption based on what is known. It is determined before any experiment begins and serves as a guide for the collection and analysis of data. For instance, we could formulate a hypothesis like, 'If I water plants with sugar-mixed water, they will grow faster.'. If subsequent experimentation disproves this hypothesis, it must be discarded or reformed.

A hypothesis does not necessarily change in response to a change in the independent variable; rather, it predicts the expected response or outcome. However, a hypothesis is not always correct. It represents our best prediction based on the current information and can often be proven wrong as new data or insights become available via further empirical research.

Furthermore, in scientific research, even though a hypothesis is supported by multiple experiments, it does not confirm it to be correct, as future experiments could contradict it. Also, if a hypothesis explains a large amount of experimental data it could be considered a theory, but even theories can be modified if new data appears.

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If the diameter of the black marble is 3.0 cm, and by using the formula for volume, what is a good approximation of its volume? Record to the ones place.
______cm3
Determine the initial volume of water in the graduated cylinder. If you added the black marble to the graduated cylinder and it sinks, what final volume should the water level indicate? Record to the ones place.
______ML

Answers

Answer:

The answers are 14 and 124, respectively.

Explanation:

The proof for these answers is the image attached.

Answer:

it is 14 and 124 I have took the test.

Explanation:

The mass of a full bottle of cooking oil is 1.30 kg when half Is empty calculate mass of empty bottle

Answers

Mass of bottle + cooking oil = 1.3 kg
Mass of bottle + 1/2 cooking oil = 0.9 kg
Thus half cooking oil = 1.3 - 0.9 
                                  = 0.4 kg
Mass of cooking oil in a full bottle = 0.4 × 2
                                                      = 0.8 kg
Therefore the mass of the empty bottle
               = 1.3 - 0.8 
               = 0.5 kg 

Record the length of the line shown in millimeters.

Choose one will mark the Brainliest.

34.3

3.43

3.40

3.4

Answers

Boss, your ruler is in centimeters which means it’s roughly 34 mm
This line is measured on a cm scale and we need to convert to mm.  To do that multiply the cm by 10.
When I look at the line the length is approximately 3.4 cm multiply that by 10 to get roughly 34 mm which matches with a

How much heat is needed to change 5.42 grams of solid gold to liquid gold at its melting point of 1,063°C? The latent heat of fusion of gold is 66.6 J/g.

Answers


[tex]5.42 \times 66.6 = 360.972[/tex]
360.972 J

Answer:

360.97 J

Explanation:

mass of gold, m = 5.42 g

Latent heat of fusion, L = 66.6 J/g

The amount of heat required to convert 1 kg of solid into liquid state at its melting point is called latent heat.

L = Heat / mass

So, L = Q / m

Q = m L

Where, Q is the amount of heat supplied and L be latent heat of fusion amd m be the mass of substance.

Q = 5.42 x 66.6

Q = 360.97 J

Thus, the amount of heat required to melt the desired amount of gold is 360.97 J.

The two balls are an "action-reaction" pair. Ball 2 had a reaction to the action of ball 1, but ball 1 also had a reaction to ball 2. Explain how each ball moved after the collision in terms of the forces the balls exerted on each other.

Answers

Newton’s first law I guess

Match the term to its definition. A. Conduction Heat flowing when a liquid or gas carries the heat B. Convection Heat flowing between two objects that are touching each other C. Radiation Heat flowing in waves

Answers

A. Conduction --> Heat flowing between two objects that are touching each other
B. Convection --> Heat flowing when a liquid or gas carries the heat
C. Radiation --> Heat flowing in waves

How was the speed of light measured in a precise way?

A. by timing how long it takes for an assistant far away to turn on a lantern after the scientist turns one on

B. by watching for eclipses

C. by timing the speed of falling meteorites

D. by using rotating mirrors to measure light's round trip travel to a distant mountain

:O :/,

Answers

The first successful measurement of the speed of light was done so through the observation of eclipses. Olaus Roemer noticed that depending on the relationship between the Earth, Sun and Jupiter there were varying differences in the times of predicted eclipses.

A balloon filled with helium occupies 20.0 l at 1.50 atm and 25.0◦
c. how many moles of helium will there be in the balloon at stp?

Answers

Final answer:

By applying the Ideal Gas Law, we find that the helium balloon contains approximately 1.22 moles under the given conditions. This mole amount remains consistent at standard temperature and pressure (STP) as no gas is added or removed.

Explanation:

Your question pertains to the concepts of chemical stoichiometry and the gas laws. Given the conditions and the volume of the gas, we start by converting the initial conditions to Standard Temperature and Pressure (STP). Your balloon containing helium is at a volume of 20.0 L, a pressure of 1.50 atm, and a temperature of 25.0°C (or 298.15 K in absolute temperature).

The Ideal Gas Law (PV=nRT) allows us to calculate the number of moles (n) in the balloon initially: n = PV/RT = (1.50 atm * 20.0 L) / (0.0821 L*atm/mol*K * 298.15 K) which results in approximately 1.22 mol of helium.

Now, to find the number of moles at STP, we need to remember that the number of moles remains the same as long as no gas is added or removed. Therefore, your balloon contains approximately 1.22 moles of helium at STP as well.

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There are approximately [tex]1.225\ moles[/tex] of helium in the balloon at STP (Standard Temperature and Pressure).

To find out how many moles of helium are in the balloon at STP (Standard Temperature and Pressure), we'll follow these steps:

Given Data

Volume of the balloon, [tex]\( V = 20.0 \) L[/tex]

Pressure of the helium gas,[tex]\( P = 1.50 \) atm[/tex]

Temperature of the helium gas, [tex]\( T = 25.0 \) ^\circ C[/tex]

Convert Temperature to Kelvin

First, convert the temperature from Celsius to Kelvin:

[tex]\[ T_{\text{Kelvin}} = T_{\text{Celsius}} + 273.15 \][/tex]

[tex]\[ T_{\text{Kelvin}} = 25.0^\circ C} + 273.15 \][/tex]

[tex]\[ T_{\text{Kelvin}} = 298.15 \text{ K} \][/tex]

Calculate the Number of Moles (using the Ideal Gas Law)

The ideal gas law equation relates the pressure, volume, temperature, and number of moles [tex](\( n \))[/tex] of a gas:

[tex]\[ PV = nRT \][/tex]

where:

[tex]\( P \)[/tex] is the pressure in atmospheres (atm)

[tex]\( V \)[/tex] is the volume in liters ([tex]L[/tex])

[tex]\( n \)[/tex] is the number of moles of gas

[tex]\( R \)[/tex] is the ideal gas constant, [tex]\( R = 0.0821 \) L\ atm/mol\ K[/tex]

[tex]\( T \)[/tex] is the temperature in Kelvin ([tex]K[/tex])

First, calculate [tex]\( n \)[/tex] using the ideal gas law:

[tex]\[ n = \frac{PV}{RT} \][/tex]

Now, substitute the given values:

[tex]\[ n = \frac{(1.50 \text{ atm}) \times (20.0 \text{ L})}{(0.0821 \text{ L·atm/mol·K}) \times (298.15 \text{ K})} \][/tex]

[tex]\[ n = \frac{30.0 \text{ atm·L}}{24.485 \text{ L·atm/mol}} \][/tex]

[tex]\[ n = 1.225 \text{ mol} \][/tex]

Match the description of how heat is transferred to the proper term. A. When two things in contact with each other transfer heat Convection B. When a liquid or gas carries heat Conduction C. When waves transfer heat Radiation

Answers

When two things in contact with each other transfer heat - Conduction
When a liquid or has carries heat- Convection
When waves transfer heat- Radiation

 these are my answers from the quiz i took

An experiment is designed to test the relationship between the initial height of a basketball before it is dropped to the height of its rebound bounce. The height of the rebound bounce is measured using a scale positioned behind the ball.

In the above experiment, which condition would not be controlled?

Answers

In general, when designing the experiment, it is desirable to control all thing that can affect the outcome of the experiment. In practice, this is not easily obtainable.
I imagine it would be hard to control the temperature in this experiment. Even though, temperature does affect the ball's bounce. 
Keep in mind that even if you don't control something it still can be measured and then you can use that information to correct your predictions.
In general, when coming up with the experiment, it's fascinating to control all factor which will have an effect on the end result of the experiment. To observe, this is often not simply gettable.
I imagine it'd be hard to manage the temperature during this experiment. although, the temperature will have an effect on the ball's bounce. 
Keep in mind that even if you do not management one thing it still is often measured then you'll be able to use that information to correct your predictions.
Explanation:

Now an uncontrolled variable is something like a force of nature, size of one thing or it's physically that cannot be controlled or modified.

An uncontrolled variable, or intermediator variable, is that the variable in an associate experiment that has the potential to negatively impact the link between the independent and dependent variables.

Which of the following items is most sensitive to increased acidity in the environment?

Answers

concrete buildings. i hope this helps you 

Answer: CONCRETE BUILDINGS

Explanation:

i got it right in my quiz

A vector has an x-component of length 10 and a y-component of length 3. What is the angle of the vector? (Hint: Use the inverse tangent.)

Answers

The vector, the x-component and the y-component form a rectangle triangle where the vector is the hypothenuse and the x and y components are the two sides.
Calling [tex]\alpha [/tex] the angle between the vector and the horizontal direction (x), the two sides are related to [tex]\alpha [/tex] by
[tex]\tan \alpha = \frac{v_y}{v_x} [/tex]
where vy and vx are the two components on the y- and x-axis. Using vx=10 and vy=3 we find
[tex]\tan \alpha = \frac{3}{10} =0.3[/tex]
And so the angle is
[tex]\alpha = \arctan (0.3)=16.7^{\circ}[/tex]

How does the mass relate to the momentum ?

Answers

Hi there!

Mass relates to momentum because
the heavier the object is, the more energy ît takes to make it start moving and make it stop. For example, if I had a 20 pound object and a 50 pound object, the 50 pound object would travel less than the 20 pound object when the same amount of force is exerted on it.

Hope this helps!

When you look into a clear pond, a fish may appear to be in a different position than it actually is. What is this caused by?

A. diffraction

B. dispersion

C. refraction

D. reflection,

Answers

Refraction Refraction is when waves are deflected when passing obliquely through the interface between one medium and another or through a medium of varying density. (the pond water)

The input force of a pulley system must move 8.0 m to lift a 3,000-n engine a distance of 2.0 m. what is the ima of the system?

Answers

The IMA (ideal mechanical advantage) of a single pulley is the ratio between the output force and the input force:
[tex]IMA= \frac{F_{out}}{F_{in}} [/tex]
Moreover, for the law of conservation of energy, the work done in input to lift the lift must be equal to the output work:
[tex]W_{in}=W_{out}[/tex]
[tex]F_{in} d_{in}=F_{out} d_{out}[/tex]
where the [tex]d_{in}[/tex] is the distance for which the input force is applied while [tex]d_{out}[/tex] is the distance of which the lift is lifted.
Substituting [tex]F_{out}=3000 N[/tex], [tex]d_{out}=2 m[/tex] and [tex]d_{in}=8 m[/tex] into the previous equation, we find the value of the input force:
[tex]F_{in}= \frac{F_{out} d_{out}}{d_{in}} = \frac{(3000 N)(2 m)}{8 m}=750 N [/tex]
And now we can find the IMA of the pulley:
[tex]IMA= \frac{F_{out}}{F_{in}}= \frac{3000 N}{750 N}=4 [/tex]

As we can see, the IMA is also equal to the ratio between the input and output distance:
[tex]IMA= \frac{d_{in}}{F_{out}}= \frac{8m}{2m}=4 [/tex]

How much time does it take to use 300 W of power to do 1800 J of work? Round your answer to the nearest whole number. The time is s.

Answers

Energy = power × time
1800 = 300 × time
time = 1800 ÷ 300 = 6 s

Hope it helped!

Answer:

It takes 6 seconds

Explanation:

Power is the rate of doing work. Power used or dissipated can be calculated as the relationship between the work done and the time it took to do it. That's why its units are also J/s.

Mathematically:

[tex]Power=\frac{Work}{time}[/tex]

In this case, we know about the Power and the work done, so we can calculate the time it took. Solving for time:

[tex]time=\frac{Work}{Power}[/tex]

Plugging in the values:

[tex]time=\frac{1800J}{300J/s}\\time=6s[/tex]

Which are ways of showing probability? Check all that apply.

Answers

i would say

-50%

-3/4

-25%

-7/8

Answer: a c e f

Explanation:

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