A physicist is investigating a beam of laser light of wavelength 550 nm. The light strikes a target that is 189 meters away from the source of the light. What is the travel time of the light from the source to the target? Let the speed of light c = 3.00 × 10^8 m/s.

Answer: here you go I was looking for this answer everywhere,I have it now so it’s 6.30 x 10^-7 s

Explanation:

I hope this helps☺️

Answer:

I can confirm that it is 6.30 x 10^-7

Explanation:

Compare and contrast acids and bases. Tell what happens when they are mixed together. (with reason)

A decathlon is a combined event in athletics consisting of 10 track and field events
True false

What are the positive and negative effects of the mountain-climbing trade on the local environment and economy? 3-5 sentences, please thx

Light with a wavelength of 5.0 · 10-7 m strikes a surface that requires 2.0 ev to eject an electron. Calculate the energy, in joules, of one incident photon at this frequency.

_____ joules

4.0 x 10 -19
9.9 x 10 -32
1.1 x 10 -48
4.0 x 10 -49

newtons second law states that fotce is equal to mass time acceleration. How does this experiment demonstrate newton's second law?

Apparent brightness depends on which two properties?
A. Distance and temperature
B. Luminosity and distance
C. Luminosity and temperature
D. Luminosity and size

The rate of change of an object's velocity is called _______.

Justin and Oscar each hit a baseball with a bat. The baseballs have the same mass, but the ball Justin hits has a greater acceleration. What might be the reason for the greater acceleration of Justin's baseball?

Do some research, and look up the difference between the zinc-carbon battery described in the lesson, and the alkaline battery (shown at the bottom), which is another common dry cell that we use every day. What are the electrodes made of in the alkaline battery? The electrolyte? Does one type have an advantage over the other? Write a short essay.

Create your own real world example of how the application of they scientific discovery has help create a new technology

The greater the mass of an object,

a.the more space it takes up


b.the more balanced it is


c.the easier the object starts moving

d.the greater its inertia

Explain how scientists are able to estimate the age of the solar system.

They use radioactive dating with samples of meteorites.
They use relative dating with the layers of the moon's surface.
They use radioactive dating with samples of moon rock.
They use relative dating with the layers of the Earth's surface.

Which statement is correct about a vacuole?

It is a rigid layer that surrounds the plant cell.
It is a rigid layer that surrounds the animal cell.
It is larger in animal cells than in plant cells.
It is larger in plant cells than in animal cells.

Which item produces the magnetic field in the electromagnet?

Lab Report
Motion and Forces
It’s time to complete your Lab Report. Save the lab to your computer with the correct unit number, lab name, and your name at the end of the file name (e.g., U4_ Lab_MotionAndForces_Alice_Jones.doc).
Introduction
What was the purpose purpose of the experiment?
The purpose of the experiment is to test the hypothesis.
What were the independent, dependent, and control variables in your investigation? Describe the variables for each part of the experiment.


Write a hypothesis based on observations and scientific principles.
Type your answer here:
Experimental Methods
What tools did you use to collect your data?
Questionnaires and observations.
Write your procedure. List each step so that another student could follow the procedure and repeat your experiment.
Type your answer here:
Data and Observations
Record your observations.
Type your answer here:
Conclusions
What conclusions can you draw about how the sum of forces acting on an object affect its motion? Write an evidence-based claim.
Type your answer here:
Which mass, A, B, or C, was the greatest? Use the observations from your experiment and your knowledge of Newton’s laws of motion to write an evidence-based claim.
Type your answer here:
Make a model that shows the forces acting on two blocks on a flat, frictionless surface:
A 1 N block at rest
A 1 N block with 2 N of force applied in one horizontal direction
Include arrows to represent the forces and labels to indicate the magnitude of each force. Use your model to compare and explain the motion of each block.
Type your answer here:

When is the best time to take RHR (Resting Heart Rate)?

Question 2 options:

After running


First thing in the morning


After eating a big dinner


none of the above

Identify two structural characteristics specific to muscle tissue.

Charles Darwin,
Seeing this new artificially designed creature at home, as the result of breeding, he coined the term ____ ______ to explain the variation of species around the islands and (by extension of his theory) also word wide
A. Amateur Selection
B. Artificial Selection
C. photosynthesis
D. Natural Selection

100 POINTS!! A chemical formula is used to represent the compound formed when two or more elements bond. Your parents decide to have a BBQ this weekend, but they need to refill the propane tank before they can start the grill. List each element and how many atoms of each element are present in one molecule of propane C3H8.

Describe 3 factors an engineer should take into consideration when choosing material for building the pipes in a pipeline

Gr. 8
Think it has something to do with Viscosity, Density, and Pressure but not sure what

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.

Helpppp meee againnnn pleaseeeeeee

What does it mean that energy cannot be created or destroyed?
A. Potential energy cannot be transformed into kinetic energy
B. Energy can only be transformed
C. Kinetic energy cannot be transformed into kinetic energy
D. Kinetic energy cannot be transformed into potential energy

The volume of the water in the graduated cylinder rose as some of the water was displaced by the golf ball. Find the volume of the ball using the formula Vb = Vf – Vi What is the volume of the golf ball?

Sample Temperature (ºC) Volume (mL)

;1. 15 . 30

;2. 8 .30

; 3 .22 .30

4 4 30

A student measures the temperature of four samples of water. Which sample has water particles that have the greatest average kinetic energy?


A. 3

B. 1

C. 4

D. 2

A box moves 10 m horizontally when force F = 20 N is applied at an angle θ=30° degrees. What is the work done on the box by force F during the displacement?

how does a free fall drop ride work with newtons 3rd law?

Which has a higher density? Helium or air?

What unit do you measure time in to determine the speed of an object?

Celsius
Grams
Kilometers
Seconds

What two gases in the atmosphere do animals and plants need to breathe and grow?