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3 years ago

How roofs are lifted off building in tornado?

Physics

1 answer:

bekas [8.4K]3 years ago

7 0

Explanation:

As a tornado or other storm system passes over a building, low pressure can tug a roof upward. When those forces surpass the force exerted by the weight of the roof, the structure flies up and is swept away by wind currents..

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Which quantities define momentum?

grigory [225]

Answer:

A. How much matter an object has, plus the magnitude and direction of its motion

Explanation:

Momentum is defined as the product of mass by velocity, in the international system of measurements (SI) momentum has the following Units [kg*m/s].

P = m*v

where:

P = momentum Lineal [kg*m/s]

m = mass [kg]

v = velocity [m/s]

Therefore the answer is A) How much matter an object has, plus the magnitude and direction of its motion

7 0

3 years ago

A satellite orbiting Earth at a velocity of 3700 m/s collides with a piece of

Gekata [30.6K]

Answer: B

Explanation:

You can use the conservation of momentum, under the assumption that no mass was lost when the collision occurred. The initial momentum of the system must equal the final momentum of the system. Our system is the region including, and only including, the satellite and the space debris. Classical momentum is defined as the product of mass and velocity:

$p_i=p_f$

$m_1v_1_i+m_2v_2_i=m_1v_1_f+m_2v_2_f$

Due to mass 1 equaling mass 2, we can factor these quantities out:

$m(v_1_i+v_2_i)=m(v_1_f+v_2_f)$

Cancel the mass term on both sides to get:

$v_1_i+v_2_i=v_1_f+v_2_f$

We have the initial and final velocities for everything besides the final velocity of the satellite. Plug everything in:

$3700m/s+6000m/s=v_1_f+3700m/s$

$v_1_f=6000m/s$

7 0

2 years ago

Why is using two thin blankets in bed usually warmer than one thick one?

Korolek [52]

I think it is because a big thick blanket has more room in it. if you have two thin blankets there isn't a whole lot there so it keeps the warmth in. <span />

4 0

3 years ago

Read 2 more answers

AP Physics I, shouldn't be too hard.

Nana76 [90]

Answer:

The correct option is;

D. The kinetic energy decreases by 3·m₀·v₀²

Explanation:

The given parameters are;

The mass of object X = m₀

The initial velocity of object X = v₀

The mass of object Y = 2·m₀

The initial velocity of object Y = -2·v₀

By conservation of linear momentum, we have;

The total initial momentum = The total final momentum

Therefore, we have;

The total initial momentum = m₀·v₀ - 2·m₀·2·v₀ = The total final momentum

∴ The total final momentum = -3·m₀·v₀

The total mass of the two object after sticking together = 2·m₀ + m₀ = 3·m₀

Therefore, the velocity of the two objects after collision = (The total final momentum)/(Total mass) = -3·m₀·v₀/(3·m₀) = -v₀

The kinetic energy = 1/2 × Mass × (Velocity)²

Therefore, the kinetic energy after collision = 1/2 × (3·m₀) × v₀² = 3·m₀·v₀²/2

The kinetic energy before collision = 1/2 × m₀ × v₀² + 1/2 × (2·m₀) × (2·v₀)² = (1/2 + 4) × (m₀·v₀²)

∴ The kinetic energy before collision = 9·(m₀·v₀²)/2

The change in kinetic energy = The kinetic energy after collision - The kinetic energy before collision = 3·m₀·v₀²/2 - 9·(m₀·v₀²)/2 = -3·m₀·v₀²

Therefore, the kinetic energy decreases by 3·m₀·v₀².

5 0

3 years ago

What is obliquity in earth's orbit?

slavikrds [6]

The angle which the Earth's axis with the plane of the orbit.

6 0

3 years ago