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nirvana33 [79]
3 years ago
14

If a wheel falls from an airplane that is flying horizontally at an altitude of 500 m, how long will it take for the wheel to st

rike the ground?
10 s
50 s
80 s
100 s
Physics
1 answer:
IrinaK [193]3 years ago
5 0
Even though the plane is moving horizontally, the only thing that matters for figuring out how long it’ll take the whee to fall are vertical forces.

In this case the only vertical force is gravity, which has an acceleration of 9.8m/s^2. We are also given height (distance) and starting velocity (0 m/s). We need to solve for time. The equation that incorporates these variables is:

d = vt + ½ at^2
500 = 0t + ½ (9.8)t^2
500 = 4.9t^2
t^2 = 102
t = 10.1 seconds
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Answer: The volume of an ideal gas will triple in value if the pressure is reduced to one-third of its initial value

Explanation:

We can determine this from the gas laws. Using Boyle's law, which states that "the pressure of a given mass of an ideal gas is inversely proportional to its volume at a constant temperature"

Mathematically, P ∝ (1/V)

Since P ∝ (1/V), we can then write that

P = k(1/V)

Where P is the pressure, V is the volume and k is the proportionality constant

PV = k

We can then write that

P1V1 = P2V2 = P3V3 = ...

Hence, P1V1 = P2V2

Where P1 is the initial pressure of the gas

P2 is the final pressure of the gas

V1 is the initial volume of the gas

and V2 is the final volume of the gas

From the question, we want to determine what will make the new volume be thrice the initial volume.

Hence,

P1 = P

V1 = V

P2= ??

V2 = 3V

Therefore,

P × V = P2 × (3V)

P2 = PV/3V

P2 = P/3 = 1/3(P)

This means the volume of an ideal gas will triple in value if the pressure is reduced to one-third of its initial value

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Ke=34J. The canoe's kinetic energy floating downriver at a speed of 2m/s and 17kg mass is 34J.

This is a problem of kinetic energy, which is a form of energy, known as motion energy. The kinetic energy of an object is that which is produced because of its movements that depends on its mass and velocity.

The kinetic energy is represented by the following formula: Ke = ½ mv². The kinetic energy is measured in Joules (J), the mass in kilograms (kg) and the speed in meters over seconds (m/s).

A small 17kg canoe is floating downriver at a speed of 2m/s. Let's calculate canoe's kinetic energy.

Ke= (17kg)[(2m/s)²]/2= 68/2 kg m²/s²=34J

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