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irga5000 [103]
3 years ago
7

A mass of 1000 kg drops from a height of 10 m on a platform of negligible mass. It is desired to design a spring and dashpot on

which to mount the platform so that the platform will settle to a new equilibrium position 0.2 m below its original position as quickly as possible after the impact without overshooting. Find the spring constant k and the damping constant b of the dashpot. Be sure to examine your proposed solution x(f) to make sure that it satisfies the correct initial conditions and docs not overshoot. Find, to two significant figures, the time required for the platform to settle within 1 mm of its final position.
Physics
1 answer:
Juliette [100K]3 years ago
4 0

Answer:

k = 5\times 10^{4}\ N/m

b = 0.707\times 10^{3}

t = 7.1\times 10^{- 5}\ s

Solution:

As per the question:

Mass of the block, m = 1000 kg

Height, h = 10 m

Equilibrium position, x = 0.2 m

Now,

The velocity when the mass falls from a height of 10 m is given by the third eqn of motion:

v^{2} = u^{2} + 2gh

where

u = initial velocity = 0

g = 10m/s^{2}

Thus

v = \sqrt{2\times 10\times 10} = 10\sqrt{2}\ m/s

Force on the mass is given by:

F = mg = 1000\times 10 = 10000 N = 10\ kN

Also, we know that the spring force is given by:

F = - kx

Thus

k = \frac{F}{x} = \frac{10000}{0.2} = 5\times 10^{4}\ N/m

Now, to find the damping constant b, we know that:

F = - bv

b = \frac{F}{v} = \frac{10000}{10\sqrt{2}} = 0.707\times 10^{3}

Now,

Time required for the platform to get settled to 1 mm or 0.001 m is given by:

t = \frac{0.001}{v} = \frac{0.001}{10\sqrt{2}} = 7.1\times 10^{- 5}\ s

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Answer:

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c) Initial momentum appears to be zero

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Natalka [10]
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Unpolarized light with intensity 300 W/m^2 passes first through a polarizing filter with its axis vertical, then through a secon
SOVA2 [1]

Answer:

The angle from vertical of the axis of the second polarizing filter is 50.57⁰.

Explanation:

Given;

intensity of the unpolarized light, I₀ = 300 W/m²

intensity of emergent polarized light, I = 121 W/m²

let the angle from vertical of the axis of the second polarizing filter = θ

Apply Malus's law, intensity of emergent polarized light is given as;

I = I₀Cos²θ

Cos^2 \theta = \frac{I}{I_o} \\\\Cos^2 \theta =\frac{121}{300} \\\\Cos^2 \theta =0.4033\\\\Cos \theta = \sqrt{0.4033} \\\\Cos \theta = 0.6351\\\\\theta  = Cos^{-1} (0.6351)\\\\\theta  = 50.57 ^0

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2 years ago
Just pretend that the cases are numbered 1-5
Sliva [168]

Answer:

Yes,

NO,

Yes,

Yes,

No.

Explanation:

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As the wire is moved through the field of a magnetic the magnetic flux through the circuit loop changes,; therefore current is induced.

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There needs to be relative motion between the wire and the magnet for the current to be induced; therefore, simply holding a magnet close to a wire will not induce current in the circuit.

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As the magnet is moved into a coil of wire, the magnetic flux through the coil changes, and therefore, the current is induced.

CASE: A magnet is moved out of  coil of wire

Moving a magnet out of  coil of wire also changes the magnetic flux through the coil; therefore, the current is induced.

CASE: A magnet rests in coil of wire

There needs to be relative motion between the coil of wire and the magnet for the current to be induced; therefore, a magnet resting in the coil of wire will no induce any current in the coil.

7 0
3 years ago
Compute the resistance in ohms of a lead block 10 cm long and .10 cm^2 in a cross sectional area (p=2.2 x 10^-5 ohm-cm
maks197457 [2]

Answer:

2.2\cdot 10^{-3} \Omega

Explanation:

The resistance of the lead block is given by

R=\frac{\rho L}{A}

where

\rho = 2.2\cdot 10^{-5}\Omega cm is the resistivity of lead

L = 10 cm is the length of the block

A=0.10 cm^2 is the cross sectional area of the block

Substituting into the equation, we find

R=\frac{(2.2\cdot 10^{-5} \Omega cm)(10 cm)}{0.10 cm^2}=2.2\cdot 10^{-3} \Omega

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