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3 years ago

Can someone help me ?????

Physics

2 answers:

Norma-Jean [14]3 years ago

8 0

I think It’s d or c b it I 90 percent think it’s c

aksik [14]3 years ago

3 0

The answer is electromagnetic induction :) ask me if you need any more help.

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A new event has been proposed for the Winter Olympics. An athlete will sprint 100 m, starting from rest, then leap onto a 20 kg

Mamont248 [21]

Answer:

3.5 m

Explanation:

Given

Mass of the bob sled , m_b = 20 kg

Mass of the girl, m = 40 kg

Speed of the girl, v = 12 m/s

Spring constant , k = 2000 N/m

Length of the ramp, L = 50 m

Angle of incline , θ = 20°

When the girl leaps on the sled , we use conservation of momentum principle

to find the speed of sled and the girl

m v + m_b (0) = (m + m_b) v_1

40 kg ×12 m/s = (20 kg + 40 kg ) v_1

v_1= 8 m/s

----------------------------------------------------------------------------

The height of the incline is ,

h = L sin 20 = 50 m sin 20° = 17.1 m

By law of conservation of energy

(m + m_b) g h + 1/2 (m + m_b) v_1^2 = 1/2 (m +m_b) v2^2 + 1/2 k x^2

(60 kg ) ×9.8 m/s^2 ×17.1 m + 1/2 (60 kg ) (8 m/s)^2 = 1/2 (m +m_b)(0)^2 +1/2(2000 N/m) x^2

x = 3.5 m

Thus, the compression in the spring is 3.5 m

5 0

4 years ago

Make a list of five materials or substances you use every day that are made from organic compounds. Write a minimum of one parag

Vaselesa [24]

1.)Baking powder NaHCO3; sodium bicarbonate Used for baking for cooking, releases CO2 in reaction with other ingredients.

2.)Detergent Sodium sulphate, sodium hydroxide and phosphatecompounds Used for washing clothes.

3.)Toothpaste Calciuym carbonate, sodium flouride Used for cleaning teeth.

4.)Salt NaCl; Sodium Chloride Used in seasoning for cooking; also used as preservative.

5.)Vinegar C2H4O2

acetic acid, ethanoic acid

Used as preservative and for seasoning foods. Utilized for various household cleaning uses.

6 0

3 years ago

How do mixtures differ from compounds?

julsineya [31]

A compound is a combination of molecules. Molecules and formula units are made of two or more different types of atoms either ionically or covalently bonded.
Compounds are made with chemical bonds. can only separated by a chemical ways.

Mixtures are two or more types of elements that are NOT chemically bonded. and we can separated by a physical ways.

3 0

4 years ago

Jessica is visiting a park with her mother. Jessica sits on a swing. Her mother pulls the swing to a height of 3 meters above th

Tpy6a [65]

You are given Jessica's height of the swing 3 meters above the ground, velocity at 5m/s² and her mass of 44 kilograms. Since there is no image given, I will assume that the position at maximum and minimum height, that is 3 and 0 meters.

Position at maximum height

PE = mgh

PE = 44 kg *9.8m/s²*3

PE = 1,294 J

Position at minimum height

PE = 0 J

Position at maximum velocity

KE = 1/2*mv²

KE = 1/2*44 kg*(5m/s²)²

KE = 550 J

Position at minimum velocity

KE = 0 J

8 0

3 years ago

Monochromatic light with a wavelength of 6.4 E -7 meter passes through two narrow slits, producing an interference pattern on a

seropon [69]

Answer:

The distance between the slits is given by 1.3 × $10^{-4}$ m

Given:

$\lambda = 6.4 \times 10^{-7} m$

D = 4 m

y = $2 \times 10^{-2} m$

m = 1

To find:

distance between slits, d = ?

Formula used:

y = $\frac{m \times \lambda \times D}{d}$

y = distance of first bright band from central maxima

D = distance between screen and source

d = distance between slits

$\lambda$ = wavelength

Solution:

distance of first bright band from central maxima is given by,

y = $\frac{m \times \lambda \times D}{d}$

y = distance of first bright band from central maxima

D = distance between screen and source

d = distance between slits

$\lambda$ = wavelength

Thus,

d = $\frac{m \times \lambda \times D}{y}$

d = $\frac{1 \times 6.4 \times 10^{-7} \times 4 }{2 \times 10^{-2} }$

d = 1.28 × $10^{-4}$

d = 1.3 × $10^{-4}$ m

The distance between the slits is given by 1.3 × $10^{-4}$ m

8 0

4 years ago