Hello
this question is for my physics homework
"display knowledge of static and kinetic coefficients of friction, and calculate one of them to solve a problem"

Please answer it fast

thank you

An 15.0-kg package in a mail-sorting room slides 4.00 mm down a chute that is inclined at 59.0 ∘∘ below the horizontal. The coefficient of kinetic friction between the package and the chute's surface is 0.90.

1.Calculate the work done on the package by gravity.

Express your answer with the appropriate units.

2.Calculate the work done on the package by the normal force.

Express your answer with the appropriate units.

3.What is the net work done on the package?

Express your answer with the appropriate units.

Alex is riding in a car that has LEDs at each end. The car passes Jordan, who is standing on the ground 25 m from the car's path, with velocity 0.8c. Flashes from the two LEDs reach Jordan simultaneously, and when he observes them, he observes one to be 3.75 m to his left, and the other to be 3.75 m to his right. According to Alex, how far apart are the LEDs, and what was the delay between their flashes?

4. By what factor does tripling the radius of a circle
increase (a) the circumference of the circle? (b) the area
of the circle?
5. What are some of the advantages of scientific notation?
6. After which numeral is the decimal point usually placed
in scientific notation? What determines the number of
numerical digits written in scientific notation?

There are three possibilities for the shape/curvature of the universe: positive curvature (closed), negative curvature (open), and flat curvature. These all imply different things about the ultimate fate of the expanding universe. What kinds of observable tests could cosmologists use to distinguish one curvature from the next? Please write a detailed paragraph explaining what kinds of theory/observations cosmologists would have to make to determine that the universe has negative curvature (open)?

1) Which one of the following statement about scientific hypothesis is FALSE
b) A scientific hypothesis is an explanation for natural phenomenon.
c)In order to be useful, a scientific hypothesis must be testable in a. way that is replicable by other scientist
d)The previously known outcome of an observation or experienment can be used as solid proof that a newly created scientific hypothesis is absolutely true

2)How does the path of the Sun change with the seasons for an observer located near the North Pole?
b)The maximum altitude of the is higher in the sky during summer
c)The maximum altitude of the inn the sky increases in the autumn
d)The maximum altitude of the in the sky decreases in the spring

4)IN the Northern Hemisphere, an observer at a higher latitude sees more circumpolar stars compared to an observer at a lower latitude, this is because?
a)The North Celestial pole is higher in the sky for an observer at a higher latitude
b)The north celestial pole is lower in the sky for an observer at a higher latitude
c) the zenith is her in the sky for an observer at a higher latitude

5)Choose the correct statement about precession of the Earth's axis?
a) Precession of the Earth's axis of rotation is caused by changes in the shape of the Earth's orbit due only to the gravitational pull of the Sun.
b)After thousands of years, the Earth's spin axis will have drifted away from Polaris and will point in a different direction.
d)Precession of Earth;s rotational axis does not affect the position of Earth's pole star

6)The worse of Earth's gravity pulls down on a snowfaleka s it floats gently toward the ground. What is the "equal and opposite force" during this interaction, according to Newton;s third law?
a)The force of the air pushing up on the snowflake
b)The force of the snowflake gravity pulling up on the Earth
d) there is no equal and opposite force in this case

1. Suppose a certain wavelength of light falls on a diffraction grating and creates an interference pattern.

   1. What happens to the interference pattern if the same light falls on a grating that has more lines per centimeter?

   2. What happens to the interference pattern if a longer-wavelength light falls on the same grating?

   3. Suppose a feather appears green but has no green pigment. Explain in terms of diffraction.

   4. Why is the index of refraction always greater than or equal to 1?

   5. Draw how light changes direction (toward or away from the perpendicular) in the following situations:

   6. goes from air to water?

   7. goes from water to glass?

   8. goes from glass to air?

   9. Why does the wavelength of light decrease when it passes from vacuum into a medium?

   10. Describe the types of images the following “devices” can create, and where the object needs to be located in relation to the “device” for that type of image to occur. Be clear in discussing all cases.

   11. a convex mirror

   12. a concave mirror

   13. a convex lens

   14. a concave lens

a) Calculate, in units ofℏ, the magnitude of the maximum total (orbital+spin) angular momentum for an electron in a hydrogen atom for states with a principal quantum number of 5.

b) An electron initially in a 4p state decays to a lower energy state. Which energy state is forbidden? (pick one): 1s, 2s, 3d, or 2p? Why?

c) What is the total number of electrons that can occupy a subshell for a given amount of orbital angular momentum l? Write an expression in terms of l.

A fast-moving electron beam strikes a metal target and produces a sharp peak in emission at one frequency as well as the bremsstrahlung continuum emission.

a) What causes this peak in X-ray spectrum? Explain what happens to the electrons in the metal atom.

b) Can a hydrogen atom emit x-rays? Explain why or why not (be quantitative about photon energy).

In the diffraction lab, we will use a laser which has wavelength is 650 nm and aim it at the hair until a clear diffraction pattern is visible on the screen or wall.

1. Does fine or coarse hair result in a greater distance between fringes in the resultant diffraction pattern? Explain the reasoning for your response.

2. Explain why laser light is used for this lab activity.

3. Differentiate between interference and diffraction and provide a common example of each from your home, work, or school experiences.

A plane leaves the airport in Galisteo and flies 170km at 68.0 degrees east of north and then changes direction to fly 230 km at 48.0 degrees south of east, and then changes direction to fly 120 mi west, after which it makes an immediate emergency landing in a pasture. When the airport sends out a rescue crew, in which direction and how far should this crew fly to go directly to the plane?

Intrinsic carrier density of Ge is 1.7x1019 /m3
. It is doped with a pentavalent impurity of 1ppm. Assuming all impurity atoms are ionized, calculate the factor by which the majority concentration is more than the intrinsic carrier concentration.

A boron nitride (BN) film was deposited using a reactive radiofrequency magnetron sputtering substrate. The deposition rate was 200nm/hr. The XPS compositional analysis showed that boron-to-nitrogen atomic ratio was 1/1 while the FTIR analysis indicated that the ratio of cubic phase (cBN) to hexagonal (hBN) phase was 55 % t0 45 %. What was the ion-to-deposition flux ratio when the ion current density was 4 mA/cm2? (Deposition area: 1/cm2; cBN mass density: ρcBN =3.48 g/cm3, Boron: Ma = 10.811 g/mol; Nitrogen: Ma = 14.0067 g/mol; hBN mass density: ρhBN =2.25 g/cm3; cBN mass density: ρcBN =3.48 g/cm3)

Describe in detail the Hertzsprung Russell (HR) diagram. Include the information contained on the vertical and horizontal axles, as well as the location of a Red Super Giant, a high mass main sequence star, a Sun like star, and low mass main sequence star, and a white dwarf star.

How do stars evolve on the HR diagram? Chose and describe of an object along one of the following:

• The Hayashi track
• The Henyey track
• The Asymptotic Giant Branch

this is for AST 1002