please help
Which is a result of using a machine?

The amount of work that is done is increased.
The work input is less than the work output.
Both the force and the distance through which it acts increase.
The distance through which a force acts increases, and the force decreases.

Answer:

A: crest

C: trough

B: wavelength

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Answer:

A: Wavelength

B: Trough

Crest

Explanation:

Answer:

No they cannot

Explanation:

A straight line going through the orign in a distance versus time graph would show that the object is going at a constant speed, meaning that the speed is not changing.

A straight line going through the origin in a speed versus time graph would show that the object is accelerating at a constant rate, or that it's speeding up/slowing down at a constant rate

It is true that if the line on a distance versus time graph and the line on a speed versus time graph are both straight lines going through the origin, then the two graphs can display the motion of the same object

Distance versus Time Graph: If the line on the distance versus time graph is a straight line, then the object's distance is proportional to the time. The object is traveling at a constant speed. The slope of this line shows the speed of the item.

Speed versus Time Graph: If the line on the speed versus time graph is likewise a straight line through the origin, the object's speed remains constant over time. The slope of this line denotes the object's acceleration.

Yes, if the line on a distance against a time graph and the line on a speed versus time graph are both straight lines through the origin, they can represent the motion of the same item.

Hence, it is true that if the line on a distance versus time graph and the line on a speed versus time graph are both straight lines going through the origin, then the two graphs can display the motion of the same object

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Answer:

Explanation:

1 meter = 100 cm

1 cm = 10 mm

Then,

0.2 m *  100 cm / 1 m =  20 cm

This does not seem like a physics question ??  

Answer:

No, the sound produced by screeching brakes is not a useful form of energy, because it does not contribute to stopping the car.

Answer:

Distance would need to increase.

Explanation:

Answer:

The force of gravity between two objects will decrease as the distance between them increases. The two most important factors affecting the gravitational force between two objects are their mass and the distance between their centres. As mass increases, so does the force of gravity, but an increase in distance reflects an inverse proportionality, which causes that force to decrease exponentially.

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Answer: D

Explanation:

I think it is D if i am wrong sorry

Answer:

Image result for what's newton's second law

Newton's second law is one of the most important in all of physics. For a body whose mass m is constant, it can be written in the form F = ma, where F (force) and a (acceleration) are both vector quantities. If a body has a net force acting on it, it is accelerated in accordance with the equation.

Answer:

C. Beats

Explanation:

When waves are interfering with each other, the sound is louder in some places and softer in others. As a result, we hear pulses or beats in the sound.

Answer:

beats

Explanation:

got it right

One component of my school's recycling system that could be automated is the sorting of recyclables. Currently, the school relies on students and staff to sort recyclables into the appropriate bins, which can be time-consuming and may result in contamination if materials are not sorted properly.

Automating the sorting process with a machine or conveyor belt system could improve the efficiency and accuracy of the recycling system. It could also potentially reduce labor costs associated with manual sorting.

The economic impact of automating the sorting process would depend on the initial cost of the equipment and any associated installation or maintenance costs. However, over time, the improved efficiency and accuracy of the system could result in cost savings for the school. Additionally, the increased efficiency of the system could potentially lead to increased recycling rates, which could result in cost savings for waste disposal and potentially generate revenue through the sale of recycled materials.

Answer:

Our school has color coded virtual trash cans. For example, a trash can for only paper will only accept paper items, if the item put inside is not paper, it will litter it out and all students have cleaning duties throughout the week so even if you or someone litters you’ll probably have to clean it up at some point anyways. I honestly think it’s very cool. (i wish this was true smh).

Answer:

A super conductor is a perfect conductor that has zero resistance. It doesn't just have very low resistance and conducts electricity well, it has ZERO resistance and conducts electricity perfectly with no losses at all

Answer:

Agree - energy can never be created or destroyed, it can only convert from one form to another (this is the Law of Conservation of Energy)

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Answer:

Arizona.

Explanation:

Petrified Forest National Park is an American national park in Navajo and Apache counties in northeastern Arizona. Named for its large deposits of petrified wood, the park covers about 346 square miles (900 square kilometers), encompassing semi-desert shrub steppe as well as highly eroded and colorful badlands.

Answer:

The estimated braking force needed to stop the lorry is zero, based on the given information and calculations. However, it's important to note that this result is likely not accurate, as some force is required to stop a moving object. It's possible that additional information or calculations are needed to obtain a more realistic estimate of the braking force.

Explanation:

To estimate the braking force needed to stop the lorry, we can use Newton's second law of motion, which states that force (F) is equal to mass (m) multiplied by acceleration (a).

In this case, the lorry decelerates uniformly, so the acceleration is constant. The initial velocity is assumed to be zero since the lorry comes to a stop. The final velocity is also zero. Therefore, we can use the equation:

Final velocity squared (vf^2) = Initial velocity squared (vi^2) + 2 * acceleration (a) * distance (d)

Since vi = 0 and vf = 0, the equation simplifies to:

0 = 0 + 2 * a * d

Solving for acceleration (a), we have:

2 * a * d = 0

a = 0

Since the acceleration is zero, it means that the braking force needed to stop the lorry is also zero. This is likely not an accurate result as some force is required to stop the lorry. It's possible that additional information or calculations are needed to accurately estimate the braking force.

The braking force required to stop a 6371 kg lorry after spotting a hazard and applying the brakes is what the question is asking for. The lorry decelerates uniformly and comes to a stop 60 meters after the brakes are applied.

The following steps will guide you on how to calculate the braking force:

Step 1: Determine the mass of the lorry which is 6371 kg. This will be denoted as m.

Step 2: Determine the distance travelled by the lorry, which is 60 m.

Step 3: Determine the time taken by the lorry to stop. This can be done by using the formula for uniform deceleration, which is a = (v-u)/t where v is the final velocity, u is the initial velocity and a is the uniform deceleration. Since the lorry comes to a stop, its final velocity is zero and its initial velocity is unknown.

However, we can assume that the lorry was initially travelling at a constant speed before spotting the hazard. Therefore, we can assume that the initial velocity was equal to the average velocity of the lorry before the brakes were applied.

This can be calculated using the formula v = d/t where d is the distance travelled and t is the time taken. The average velocity can therefore be calculated as follows: v = d/t = 60 m/t

Step 4: Rearrange the formula for uniform deceleration, a = (v-u)/t, to find u which is the initial velocity. Since the lorry comes to a stop, we know that v = 0.

Therefore: u = v - at where a is the uniform deceleration and t is the time taken to stop which is also equal to the time taken for the lorry to travel the distance of 60 meters. Substituting for v, we get: u = - at

Step 5: Calculate the acceleration of the lorry using the formula a = (v-u)/t. Since the final velocity is zero, we get: a = -u/t = -(-at)/t = a The acceleration is negative since the lorry is decelerating.

Step 6: Calculate the braking force using the formula F = ma where F is the braking force and m is the mass of the lorry. Therefore: F = ma = (-ma) since a is negative = (-6371 kg) (a) Therefore, the braking force required to stop the lorry is -6371a N where a is the uniform deceleration calculated in Step 5.

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Answer:

60 km/h

~16.7 m/s

Explanation:

speed= s1-s0/t1-t0

speed= 300-0/5-0= 60 km/h

60 km/h / 3.6 = ~ 16.7 m/s

Answer:

it is 60 kmh

Explanation:

it is 60 kmh because 300÷ 5=60

can you please mark brainly because i had it but for no reason someone deleted my answer and brainly took away my points

Answer:

The resources

Explanation:

The atmosphere and also the water and how Earth is in the goldilocks zone for the temperature to be good and sustainable for humans and other organisms to live on it another way live can survive on this planet from the characteristics is how there are many more resources on it than other planets in the solar system also how the gravitational pull is different than other planets

Answer:

In fact, the tallest mountains and deepest canyons are found on the ocean floor; far taller and deeper than any landforms found on the continents.

Rising up from the abyssal plain, you would encounter the mid-ocean ridge, an underwater mountain range, over 40,000 miles long, rising to an average depth of 8,000 feet. Tracing their way around the global ocean, this system of underwater volcanoes forms the longest mountain range on Earth.

Underwater landforms · Continental shelf Abyssal plains Mid-ocean ridge Ocean trenches Plate tectonics and the ocean floor Hydrography.

Seafloor spreading occurs at divergent plate boundaries. As tectonic plates slowly move away from each other, heat from the mantle's convection currents makes the crust more plastic and less dense.

At the deep-sea trenches, two plates converge, with one plate sliding down under the other into the mantle where it is melted. Thus, for each segment of new ocean floor created at the ridges, an equal amount of old oceanic crust is destroyed at the trenches, or so-called subduction zones.

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Answer: D

Explanation:

Answer:

4 seconds

Explanation:

30+30+30+30=120

that is 4 30s so that is the anwser

Answer:

Erosion produces landform that are often tall and jagged with cuts in layers of rock, and deposition usually produces landforms that are flat and low-lying.

Here, we are required to determine which procedure could be used to demonstrate that matter is conserved during a chemical change or reaction.

The Correct answer is option A.

First, a chemical change is one in which a chemical compound is transformed into one or more chemical substances and consequently, the resulting compounds have different chemical properties as their atoms are arranged differently.

From the definition above, it is evident option A where an acid and a base are reacted together to form water and salt is an example of chemical change and obeys the law of conservation of matter.

This is so because, upon first measuring the mass of the acid and base separately and then measuring the mass of the resulting salt and water.

The mass in both instances is constant.

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Answer:

During the first quarter or last quarter phase of the moon, when the sun and moon are perpendicular (at right angles) to each other in relation to the Earth, the tidal gravitational pulls interfere with each other, producing weaker tides, known as neap tides.

Explanation:

Answer:

A.

Explanation:

Millions of years ago, most of the foests we see today used to be oceans. In modern-day we find fossils in the ground from those old eras long ago, back when there were only sea creatures on earth and we find these.

Answer:

A falling object is in free fall when the only force acting on the force is gravity.

Explanation:

Because the only force acting on you is gravity, the scale no longer is pushing your cart up. Or in other words - your no longer pushing down onto the scale.

Answer: Truck escape ramps are used as a traffic tool on steep, sustained grades to check high vehicle speeds in emergencies. The ramps use a combination of momentum-halting media like gravel or sand and an incline to bring runaway vehicles to a halt.

Explanation:

Therefore, the answer is 3.

The magnet produces a magnetic field. Item A makes the magnetic field in the electromagnet.

Explanation:

Item A is called a magnet. It has a North pole and a South pole. The electrons move from the North to the south poles, creating a magnetic force.

This Magnetic field creates a magnetic field around a magnet.

Answer: D

Explanation: it is made of metal which attracts the magnetic force field