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3 years ago

Does air have weight? Explain your answer. PLEASE HURRY!

Physics

2 answers:

goblinko [34]3 years ago

6 0

Answer:

Yes, it does.

Explanation:

Air has mass, and anything with mass has weight. We can tell it has mass, because we can feel it when the wind blows.

Liono4ka [1.6K]3 years ago

4 0

Answer:

Explanation:

Air doesn't have weight because it is, in terms, an oxygen gas.

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A mass of 4 kg is traveling over a quarter circular ramp with a radius of 10 meters. At the bottom of the incline the mass is mo

amid [387]

Answer:

499.7 J

Explanation:

Since total mechanical energy is conserved,

U₁ + K₁ + W₁ = U₂ + K₂ + W₂ where U₁ = potential energy at bottom of incline = mgh₁, K₁ = kinetic energy at bottom of incline = 1/2mv₁² and W₁ = work done by friction at bottom of incline, and U₂ = potential energy at top of incline = mgh₂, K₁ = kinetic energy at top of incline = 1/2mv₂² and W₂ = work done by friction at top of incline. m = mass = 4 kg, h₁ = 0 m, v₁ = 21.3 m/s, W₁ = 0 J, h₂ = radius of circular ramp = 10 m, v₂ = 2.8 m/s, W₂ = unknown.

So, U₁ + K₁ + W₁ = U₂ + K₂ + W₂

mgh₁ + 1/2mv₁² + W₁ = mgh₂ + 1/2mv₂² + W₂

Substituting the values of the variables into the equation, we have

mgh₁ + 1/2mv₁² + W₁ = mgh₂ + 1/2mv₂² + W₂

4 kg × 9.8 m/s²(0) + 1/2 × 4 kg × (21.3 m/s)² + 0 = 4 kg × 9.8 m/s² × 10 m + 1/2 × 4 kg × (2.8 m/s)² + W₂

0 + 2 kg × 453.69 m²/s² = 392 kgm²/s² + 2 kg × 7.84 m²/s² + W₂

907.38 kgm²/s² = 392 kgm²/s² + 15.68 kgm²/s² + W₂

907.38 kgm²/s² = 407.68 kgm²/s² + W₂

W₂ = 907.38 kgm²/s² - 407.68 kgm²/s²

W₂ = 499.7 kgm²/s²

W₂ = 499.7 J

Since friction is a non-conservative force, the work done by all the non-conservative forces is thus W₂ = 499.7 J

4 0

3 years ago

PLS HELP!!! The quarter back runs 75 meters down a football field in 12 seconds to score a touchdown. How fast did he run? A. 0.

atroni [7]

Answer:

B.6

Explanation:

speed = distance / time

= 75m / 12s

= 6.25 m/s

The closest answer is b. 6 m/s

heart plz

3 0

4 years ago

A uranium ion and an iron ion are separated by a distance of =61.10 nm. The uranium atom is singly ionized; the iron atom is dou

scoray [572]

Answer:

Explanation:

Charge on uranium ion = charge of a single electron

= 1.6 x 10⁻¹⁹ C

charge on doubly ionised iron atom = charge of 2 electron

= 2 x 1.6 x 10⁻¹⁹ C = 3.2 x 10⁻¹⁹ C

Let the required distance from uranium ion be d .

force on electron at distance d from uranium ion

= 9 x 10⁹ x 1.6 x 10⁻¹⁹ / r²

force on electron at distance 61.10 x 10⁻⁹ - r from iron ion

= 9 x 10⁹ x 3.2 x 10⁻¹⁹ / (61.10 x 10⁻⁹ - r )²

For equilibrium ,

9 x 10⁹ x 1.6 x 10⁻¹⁹ / r² = 9 x 10⁹ x 3.2 x 10⁻¹⁹ / (61.10 x 10⁻⁹ - r )²

2 d² = (61.10 x 10⁻⁹ - r )²

1.414 r = 61.10 x 10⁻⁹ - r

2.414 r = 61.10 x 10⁻⁹

r = 25.31 nm .

4 0

3 years ago

A tourist bus is carrying passengers from the bottom of a hill to the top. the people, the bus, and the luggage can be analyzed

WINSTONCH [101]

The friction between the tires and the road causes loss of energy in the form of heat-energy.

<h3>What is kinetic energy?</h3>

The term kinetic energy refers to the energy of an object that is in motion. The pasengers that are sitting at a point possess potential energy. If the bus stops suddenly, the potential energy of the passengers is converted to kinetic energy as they move forward.

Since friction causes loss of energy, the friction between the tires and the road causes looss of energy in the form of heat-energy.

Learn more about kinetic energy: brainly.com/question/12669551

7 0

2 years ago

Which describes how outer space, air, and glass affect the speed of light?

11Alexandr11 [23.1K]

The following that describes how outer space, air, and glass affect the speed of light is that light travels fastest through outer space, it travels somewhat slower though air, and of these three, it travels the slowest through glass. The answer is letter B.

5 0

3 years ago