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aniked [119]
3 years ago
14

Match the scenario with the justification Please help ;-; 1. Gage is beginning a low calorie diet, so he eats three servings of

chicken for lunch. 2. Walter eats two servings of whole grain pasta the night before running a 5K. 3. Maggie eats half a candy bar and saves the rest for the next day. Fatty foods contain nine grams of pure fat and have little nutritional value. A. Protein contains four calories per gram of fat, so it is a low fat, high energy food. B. Carbohydrates contain four calories per gram of fat, so they need to come from grains in moderation. C. Fatty foods contain nine grams of pure fat and have little nutritional value.
Physics
1 answer:
AfilCa [17]3 years ago
4 0

Answer:

1. "Gage is beginning a low calorie diet, so he eats three servings of chicken for lunch" is equal to C: "Protein contains four calories per gram of fat, so it is a low fat, high energy food."

2. "Walter eats two servings of whole grain pasta the night before running a 5K" is equal to B: "Carbohydrates contain four calories per gram of fat, so they need to come from grains in moderation."

3. "Maggie eats half a candy bar and saves the rest for the next day" is equal to A: "Fatty foods contain nine grams of pure fat and have little nutritional value."

Explanation:

Chicken is a popular, low-fat food that provides an impressive amount of high-quality protein in just one serving. The breast is the leanest part of a chicken. A 3-ounce (85-grams) serving of roasted, skinless chicken breast contains only 3 grams of fat but provides 26 grams of protein (47).

Pasta is a fat-free, low sodium food that can fit right in with a weight loss or management plan. One cup of cooked pasta contains just 200 calories, in addition to valuable vitamins and minerals.

Sweets like candy, soft drinks, syrups, jams, and jellies are made mostly of sugars. Most of these foods do not contain many vitamins or minerals. So they are called "empty calorie" foods. Fats, oils and sweets are not bad foods.

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Answer:

Just find the formula then you can do it

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To determine the muzzle velocity of a bullet fired from a rifle, you shoot the 2.47-g bullet into a 2.43-kg wooden block. The bl
Elza [17]

Answer:

The velocity of the bullet on leaving the gun's barrel is 236.36 m/s.

Explanation:

Given;

mass of the bullet, m₁ = 2.47 g = 0.00247 kg

mass of the wooden block, m₂ = 2.43 kg

initial velocity of the wooden block, u₂ = 0

height reached by the bullet-block system after collision = 0.295 cm = 0.00295 m

let the initial velocity of the bullet on leaving the gun's barrel = v₁

let final velocity of the bullet-wooden block system after collision = v₂

Apply the principle of conservation of linear momentum;

Total initial momentum = Total final momentum

m₁v₁ + m₂u₂ = v₂(m₁ + m₂)

0.00247v₁  + 2.43 x 0  =  v₂(2.43 + 0.00247)

0.00247v₁ = 2.4325v₂ -------(1)

The kinetic energy of the bullet-block system after collision;

K.E = ¹/₂(m₁ + m₂)v₂²

K.E = ¹/₂ (2.4325)v₂²

The potential energy of the bullet-block system after collision;

P.E = mgh

P.E = (2.4325)(9.8)(0.00295)

P.E = 0.07032

Apply the principle of conservation of mechanical energy;

K.E = P.E

¹/₂ (2.4325)v₂² = 0.07032

1.21625 v₂²  = 0.07032

v₂²  = 0.07032  / 1.21625

v₂² = 0.0578

v₂ = √0.0578

v₂ = 0.24 m/s

Substitute v₂ in equation (1), to obtain the initial velocity of the bullet;

0.00247v₁ = 2.4325v₂

0.00247v₁ = 2.4325 (0.24)

0.00247v₁ = 0.5838

v₁ = 0.5838 / 0.00247

v₁ = 236.36 m/s

Therefore, the velocity of the bullet on leaving the gun's barrel is 236.36 m/s.

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3 years ago
Explain how astronomers might use spectroscopy to determine the composition and temperature of a star.
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Everything starts from spectroscopy. Astronomers only have concentrated information at wavelengths that are emitted from the stars. What they do with this information is to obtain the frequency range of the stars and through spectroscopes they are responsible for dividing the radiation beams and determining the coincidence with the emission of those same waves, of chemical elements. From these observation techniques it is possible to obtain the composition and according to the color, obtaining characteristics such as temperature. The spectrum of stars consists of dark and bright lines called Fraunhofer lines. This spectrum is compared to the spectrum of different elements to find the composition of the stars. This is possible because the elements emit or absorb only specific wavelengths.

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3 years ago
Which of the following energy resources does not produce greenhouse
Inessa [10]

Answer:

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7 0
3 years ago
Electromagnetic radiation of 8.12×10¹⁸ Hz frequency is applied on a metal surface and caused electron emission. Determine the wo
klemol [59]

Answer:

The work function ϕ of the metal = 53.4196 x 10⁻¹⁶ J      

Explanation:

When light is incident on a photoelectric material like metal, photoelectrons are emitted from the surface of the metal. This process is called photoelectric effect.

The relationship between the maximum kinetic energy (E_{k}) of the photoelectrons to the frequency of the absorbed photons (f) and the threshold frequency (f₀) of the photoemissive metal surface is:

                                        E_{k} = h(f − f₀)

                                        E_{k} = hf - hf₀

E is the energy of the absorbed photons:  E = hf

ϕ is the work function of the surface:  ϕ = hf₀

                                        E_{k} = E - ϕ

Frequency f = 8.12×10¹⁸ Hz

Maximum kinetic energy E_{k} = 4.16×10⁻¹⁷ J  

Speed of light  c = 3 x 10⁸ m/s

Planck's constant h = 6.63 × 10⁻³⁴ Js                                

                                        E = hf = 6.63 × 10⁻³⁴ x 8.12×10¹⁸

                                        E = 53.8356 x 10⁻¹⁶ J

from E_{k} = E - ϕ ;

                                        ϕ = E - E_{k}

                                        ϕ = 53.8356 x 10⁻¹⁶ - 4.16×10⁻¹⁷

                                        ϕ = 53.4196 x 10⁻¹⁶ J

The work function of the metal ϕ = 53.4196 x 10⁻¹⁶ J      

4 0
3 years ago
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