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3 years ago

A projectile is shot straight up from the earth's surface at a speed of 10,000 km/hr. how high does it go?

1 answer:

7 0

Naturally we assume that 10000 km/hr is initial velocity (same as being shot from a cannon), and no air resistance. With so high a velocity, the effect of diminishing gravity with increasing radius must be taken into account, so you use an energy solution. M is earth mass, r is earth radius.
KE/m = (9000000/3600)^2/2 = 3858025 J/kg
ΔPE/m = (PE(at height) - PE(at surface))/m = -GM/(r+h) + GM/r
KE/m = ΔPE/m
KE/m - GM/r = -GM/(r+h)
h = -GM / (KE/m - GM/r) - r = 335665.44 m
(Using G = 6.673E-11 Nm^2/kg^2, M = 5.9742E24 kg, r = 6378100 m)

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Advocard [28]

For the given problem, we calculate the required time by using the formula P = W/t.

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P = (1/2) x m x 58^2 / t = 1682 m / t

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4 years ago

Two straight wires are in parallel and carry electrical currents in opposite directions with the same magnitude of LaTeX: 2.02.0

koban [17]

Answer:

$2.4\times 10^{-5} N$

Explanation:

We are given that

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Distance between the wires, $d=5.0 mm=5\times 10^{-3} m$

1mm= $10^{-3} m$

Length of other wire,l=0.3 m

Length of one wire is infinite.

We have to find the magnitude of force between the two wires.

We know that magnetic force

$F=\frac{2\mu_0 I_1I_2 l}{4\pi d}$

Where $\frac{\mu_0}{4\pi}=10^{-7}$

$F=\frac{2\times 10^{-7}\times 2\times 2\times 0.3}{5\times 10^{-3}}$

$F=2.4\times 10^{-5} N$

When the wires carrying equal current in opposite direction then the force between two wires repel to each other.

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3 years ago

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zysi [14]

Answer:

The answer is Kinetic Energy

Explanation:

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4 years ago

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KatRina [158]

Answer:

They will become aligned according to the charges on the metal plate.

Explanation:

When Polar molecules are placed between oppositely charged metal plates the molecules will tend to be attracted by their corresponding oppositely charged plates that is the positive and negative plates,

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3 years ago

A simple pendulum 50 oscillations 22.3s find its period

Harman [31]

Answer:

22.3s / 50 =0.446s

Explanation:

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3 years ago