A 15.0 cm object is 12.0 cm from a convex mirror that has a focal length of -6.0 cm. What is the height of the image produced by the mirror? A. –5.0 cm B. 7.5 cm C. -7.5 cm D. 5.0 cm

Answer: D. 5cm

Explanation:

Given the following :

Focal length (f) = - 6.0 cm

Height of object = 15.0cm

Distance of object from mirror (u) = 12.0cm

Height of image produced by the mirror =?

Firstly, we calculate the distance of the image from the mirror.

Using the mirror formula

1/f = 1/u + 1/v

1/v = 1/f - 1/u

1/v = 1/-6 - 1/12

1/v = - 1/6 - 1/12

1/v = (- 2 - 1) / 12

1/v = - 3 / 12

v = 12 / - 3

v = - 4

Using the relation :

(Image height / object height) = (- image distance / object distance)

Image height / 15 = - (-4) / 12

Image height / 15 = 4 / 12

Image height = (15 × 4) / 12

Image height = 60 / 12

Image height = 5cm

Answer:

D. 5 cm

Explanation:got it right

A double coconut can grow for 10 years and have a mass of 20.0 kg. If a 20.0 kg double coconut oscillates on a spring 42.7 times each minute what is the spring constant of the spring?

Why did SpaceX install sun shields on the Starlink satellites? A to reduce light pollution caused by the satellites B to keep the satellites cool C to increase the amount of light reflected by the satellites D to provide solar power to the satellites

Using the knowledge you have about electricity, what invention would you create to provide electricity for those third world countries who need it? Post a picture of your invention listing the significance. If you have a country specifically in mind this could help please list that country, as well.

A group of students is tasked with developing a checklist for determining whether a material undergoes a chemical or physical change. The students make a preliminary list of properties that they can test and classify each as either a chemical or physical property.

Chemical Property Physical Property
bubbles when treated with acid color
burns when placed in a candle flame odor
density hardness
boiling point mass
dissolves in water melting point
Several other students in the class claim that the checklist is incorrect.

What change should the group make to the checklist to correct their mistake?


Boiling point and density should be moved to the physical property side of the list, and color and odor should be moved to the chemical property side of the list.


Boiling point and density should be moved to the physical property side of the list, and hardness and mass should be moved to the chemical property side of the list.

Dissolves in water and boiling point should be moved to the physical property side of the list, and odor and mass should be moved to the chemical property side of the list.

Density and boiling point should be moved to the physical property side of the list.

please help

can someone please help me?

A physics student weighing 500 N stands on a scale in an elevator and records the scale reading over time.

The data is
shown in the graph above. At time t= 0, the elevator is at rest on the ground floor.

What is the acceleration of the student
from 10-15 s?

Reed, Riley, Ean, and Michael want to run a race against each other. They start on the 20 yard line of the football field and finish at the 50 yard line. The times for them to
complete the race are listed in the table.
Reed
4 seconds
Riley
5 seconds
Ean
6 seconds
Michael
10 seconds
Which of the boys ran the race at an average speed of 5 yards per second?

giving out brain but don't beg because i will choose if the answer was right.

Two dogs are pushing against a box of dog treats from opposite sides. Dog 1 is pushing with 10 newtons of force to the right, and dog 2 is pushing with 15 newtons of force to the left. what is being applied to the box of dog treats?

A. 5 N to the left
B. 25 N to the left
B. 150 N to the left

Look at both pictures. Answer the question correctly.

A crane has a counterweight of 6000N at a distance of 4 m from the tower. What weight can be lifted on the loading platform at a distance of 5m from the tower on the other side?

Which of the following is the most likely global climate change?
a. a decrease in the overall temperature of the Earth
b. an increase in the overall temperature of the Earth
an increase in the number of cold climates
no change to global climate
C.
d.
Please select the best answer from the choices provided
OA
OB
OC
OD

What is the Eiffel Tower made of?

Can lightning be transported? If it can, can you explain how?

10 points are to be given.

Question is in the picture ^

What force is acting on the rainwater in the model?

the model shows water flowing down from the highest point to the lowest.

Matthew and his dad are walking along the beach. Matthew runs toward the water and dips his hands in the cool ocean. Then, he walks back to his dad and grabs his hand. “Matthew, your hands are so cold now!” his dad exclaims. Where did conduction occur during this scenario?
A. between Matthew’s warmer body and his now cooler hand
B. between Matthew’s hand and his father’s hand
C. between Matthew’s warm hand and the cool water
D. between Matthew's father's hand and the cooler water

an elastic material offers no resistance to forces that changes its shape

true or false

With energy, changes in the physical world are possible. These can be a change in speed, a change in direction, a change from cold to hot, and many other kinds of changes.

Question 4 options:
True
False

1 sentence telling me the topic of the story. In your own words.
3 sentences you copy straight from the magazine with "quotation" marks around it. This sentence proves that the topic is what you stated in the first sentence.
1 sentence telling me the conclusion. In your own words.
3 sentences you copy straight from the magazine with "quotation" marks around it. This sentence proves that the conclusion is what you stated in the sentence above this one
The average woodpecker smashes its beak against a hard surface more than 10,000 times a day. Any human who jolted their head like this would likely end up with a concussion. This traumatic brain injury is caused by a blow to the skull. So why doesn’t the constant hammering turn woodpeckers’ brains into mush? For years, it was assumed that woodpeckers had some kind of cushioning in their heads to protect their brains during pecking. Many scientists suggested that spongy bone in the birds’ skulls absorbed and lessened the shock of each impact (see Myth Buster: Hard Headed). This idea was repeated in scientific articles, textbooks, and informative plaques at zoos. Even though the concept “is often presented like a clear-cut fact, there haven’t been any real tests to prove it,” says Sam Van Wassenbergh. He’s a biologist who studies biomechanics, or how living things move, at the University of Antwerp in Belgium.SHOCK ABSORBER: Van Wassenbergh uses a spring-loaded hammer to show why a shock-absorbing skull would make a woodpecker less efficient at pecking. When you think about it, says Van Wassenbergh, the shock-absorbing skull idea doesn’t make much sense. Woodpecker drills into the wood in search of insects to eat. When the bird’s head accelerates forward, the movement generates kinetic energy. This energy of motion is transferred to the tree when the bird slams its beak against the trunk. If a woodpecker’s skull had to cushion, it would absorb some of this energy and decrease the force of the peck. Why would a bird that survives by pecking evolve to do it less effectively? Van Wassenbergh and his team decided to see what was really going on. First, the researchers recorded videos of woodpeckers’ heads in motion. To capture this rapid movement, the scientists needed special high-speed cameras. Each peck lasts only a fraction of a second! Van Wassenbergh’s team recorded videos of six woodpeckers from three species and analyzed the footage. The researchers used a computer to track three points on each bird’s head: one on the skull and two on the beak. The scientists hypothesized that if the birds’ skulls had shock absorbers, the footage would show a “squishing” of the space between the skull and beak—like when a spring compresses. But that didn’t happen. Instead, the birds’ heads moved as one stiff unit, like a hammer. Next, the team wanted to demonstrate why this adaptation would be helpful to the birds. Using computer models, the scientists simulated woodpecker skulls with and without shock absorbers. Then the researchers compared the force of the pecks. “The pecking performance was greatly reduced in the skull with a shock absorber,” says Maja Mielke, a biologist who worked on the study. With shock absorbers, says Mielke, “the poor birds would need to pound even harder to reach the same results.” For a woodpecker, having a shock-absorbing skull would simply be a waste of energy. Science World originally published this diagram in our May 10, 2021, issue. It was based on scientists’ beliefs about woodpecker anatomy at the time. Here it is again—updated based on new research. MYTH: The skull is made of spongy bone that cushions and protects the brain from impactBUSTED! The skull is hard enough to protect the bird from injury, but it doesn’t cushion The eyes have a special membrane that protects them from flying splinters and wood dust.MYTH: Neck muscles are strong and stiff enough to absorb the shock of each peck BUSTED! Stiff neck muscles do not absorb shock—in fact, they help increase the force of each peck.MYTH: The tongue wraps completely around the outside of the skull, providing an additional level of cushioning, and can extend to probe for food inside holes made by the birdBUSTED! The tongue does not provide any observable cushioning. The beak is connected to the skull with thick bone that prevents jolts and vibrations. NEW RESEARCH SHOWS: The woodpecker’s brain is small, which helps prevent concussions that might occur in a larger animal. If woodpeckers’ skulls don’t absorb shock, then why doesn’t constant pecking damage the birds’ brains? To answer this question, the researchers calculated how harmful the blows from pecking actually are. It turns out the hits aren’t that dangerous because the birds’ brains are so small. “Small masses can tolerate stronger impact forces without being damaged,” says Mielke.

The half-life of sodium-24 is 15 minutes. What was the original mass of Na-24 if 5.0 g remains after 1 hour?
20 g
40g
80g
100g

WILL RATE BRAINLIEST!!!
When you use electricity in your home,

which resources are powering it?

Research the energy resources used

to power your state’s electrical grid

(that’s what supplies your home with

electricity). In the space below or on

a separate sheet of paper, create an

informative handout to provide to the

people of your state.

Include the following information in your handout:

• Which state do you live in?

• What is the population of your state?

• What percent of the electricity in your state comes from

nonrenewable resources?

• What percent of the electricity in your state comes from

renewable resources?

• What percent of the electricity in your state comes from

nuclear energy?

• Which renewable resource is used the most in your state?

• What is an interesting fact about energy usage in your

state?

I live in United Arab Emarates/Dubai

What is the formula to calculate the GPE of an object?

Which data provide the best evidence of supermassive black holes at the centers of galaxies?
A.
sonar observations of the black hole
B.
observations of infrared radiation coming from the black hole
C.
observations of visible light coming from the black hole
D.
X-ray observations of superheated gas around the black hole

A meteor falls toward Earth's surface. Given that the acceleration due to
gravity is 9.8 m/s^2, what is the meteor's potential energy if it has a mass of 10
kg at an altitude of 400 m?
O A. 408 J
O B. 7,840,000 J
O C. 2J
O D. 39,200 J

Earth's atmosphere is composed of
A.
iron, oxygen, and silicon.
B.
nitrogen, oxygen, and trace amounts of other gases.
C.
water, liquid oxygen, and trace amounts of other liquids.
D.
carbon dioxide, ozone, and magnesium.

The strength of the gravitational attraction depends on the mass of the objects involved and on the distance between them. The gravitational force between two objects will be lowest in which of the following situations?
A. Both objects have small masses and are close together.
B. One object has a large mass, and the objects are close together.
C. Both objects have large masses and are close together.
D. Both objects have small masses, and they are far apart.

How do we know there has not been an increase in the number of earthquakes? Officials from the U.S. Geological Survey, the government agency that keeps track of earthquakes, point to statistics. On average, there have been no more earthquakes so far in 2010 than there were in previous years.

What Happens During Earthquakes?

In reality, it's not the number of quakes that has gained our attention, but the devastating impact quakes can have. Earthquakes are very natural—it's inevitable that they'll happen because of the way the planet works. The earth's surface is made up of tectonic plates that fit together like puzzle pieces and are always moving past each other. When two of the plates' edges get caught, stress builds up at the fault line—the crack between the plates. When the plates are finally able to break free of each other, the stress is released, and an earthquake occurs. Earthquakes of varying strengths happen every day, usually at fault lines. Some of these quakes have a high magnitude, while others are relatively weak. But it's often where an earthquake takes place that determines whether it will be something that goes largely unnoticed, or a disaster that affects thousands of people.

What Is Changing?

In the past, earthquakes were not as much of a problem because Earth's population was smaller, and cities were less populated.

"Look at some of the big [earthquakes] recently," said Debarati Guha-Sapir of the World Health Organization. Guha-Sapir cited some earthquakes that took place in areas where the population had increased in recent years, making the quakes more serious. "Had the Izmit or Bhuj quakes [of 1999 and 2001] happened 30 years ago, the events would have been relatively insignificant, as the [populations] of these cities were a third of what [they were when the earthquakes happened]. Increasing population density makes a small event into a big one."

Some of the earthquakes that took place in early 2010 occurred in highly populated areas, as well. More people are moving into megacities that happen to be built on fault lines—and many cities are on fault lines. Of the 130 cities with more than one million people, more than half are in earthquake zones, making them more prone to earthquakes.

In many of these cities, officials have drawn up laws requiring that buildings be designed and constructed to endure earthquakes. But some cities, particularly those in developing countries, lack the resources to do this. There, people are rapidly putting up substandard buildings that can't withstand the force of the shaking earth. For example, the Haiti earthquake took place near the nation's crowded capital. There was a great deal of destruction because there were "too many people crammed into a city that wasn't meant to have that many people and have an earthquake," said University of Miami geologist Tim Dixon.

Another reason quakes seem worse is that we're paying more attention. Everyone noticed when the Haiti earthquake was quickly followed by the Chile earthquake. Many people watched the news and the Internet for updates on these disasters, unable to believe that they were seeing two major earthquakes in such a short period of time. But eventually, the earth will have a period when earthquakes are minor or in unpopulated areas. Then people won't notice quite so much anymore.

"People are paying attention to the violent planet we've always lived in," said Dennis Mileti, a seismic researcher. "Come back [at a time when] there have been no [noticeable] earthquakes, [and] most people will have forgotten [about them] again."

According to the article, what is one reason why it seems as if the world is experiencing more earthquakes than usual?

It is more difficult to produce large mirrors for telescopes that have large objective lenses.
True
False

List an example of matter in each of the three states.

How much voltage must be applied across a 0.20 Ω wire in order to create a 30 A current? (Please show work for it too)