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3 years ago

A hockey puck slides across the ice at a constant velocity. Is the sliding puck in equilibrium? Why or why not?

Physics

1 answer:

geniusboy [140]3 years ago

3 0

Answer:

Since the hockey puck is moving at constant velocity

So here we will have

$F_{net} = ma$

where we have

a = acceleration of the object

m = mass of object

so here since we know that acceleration is defined as rate of change in velocity

so here we will say that

$a = \frac{dv}{dt}$

$a = 0$

so we have

$F_{net} = 0$

so we will say that hockey puck is in equilibrium as there is no net force of it

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3 years ago

A particle with charge 7.76×10^(−8)C is moving in a region where there is a uniform 0.700 T magnetic field in the +x-direction.

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Answer:

The z-component of the force is $\= F_z = 0.00141 \ N$

Explanation:

From the question we are told that

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The magnitude of the magnetic field is $B = 0.700\r i \ T$

The velocity of the particle toward the x-direction is $v_x = -1.68*10^{4}\r i \ m/s$

The velocity of the particle toward the y-direction is

$v_y = -2.61*10^{4}\ \r j \ m/s$

The velocity of the particle toward the z-direction is

$v_y = -5.85*10^{4}\ \r k \ m/s$

Generally the force on this particle is mathematically represented as

$\= F = q (\= v X \= B )$

So we have

$\= F = q ( v_x \r i + v_y \r j + v_z \r k ) \ \ X \ ( \= B i)$

$\= F = q (v_y B(-\r k) + v_z B\r j)$

substituting values

$\= F = (7.7 *10^{-8})([ (-2.61*10^{4}) (0.700)](-\r z) + [(5.58*10^{4}) (0.700)]\r y)$

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3 years ago

What is the longest wavelength of light that will emit electrons from a metal whose work function is 3.70 eV

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Answer:

h f = Wf + K

where the total energy available is h f, Wf is the work function or the work needed to remove the electron and K is the kinetic energy of the removed electron

If K = zero then hf = Wf

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λ = h c / Wf = 6.63E-34 * 3.0E8 / (3.7 * 1.6E-19)

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