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Agata [3.3K]
3 years ago
11

For a given initial velocity, how does the time td it takes to stop on dry snow differ from the time tw it takes to stop on wet

snow
Physics
1 answer:
salantis [7]3 years ago
7 0

let the friction coefficient on dry ice and wet ice is different and given as

\mu_d = on dry ice

\mu_w = on wet ice

now by friction force formula we can say

F_f = -\mu mg

so the deceleration due to friction force is given as

a = -\mu g

now the deceleration due to friction force on both surface is given as

a_1 = -\mu_d * g

a_2 = -\mu_w * g

now the time to stop the two blocks can be calculated by kinematics

v_f - v_i = a t

0 - v_0 = -\mu_d * g * t_d

t_d = \frac{v_0}{\mu_d* g}

also for other block on wet ice we can say similarly

t_w = \frac{v_0}{\mu_w*g}

now the ratio of two time on two surfaces is given as

\frac{t_d}{t_w} = \frac{\mu_w}{\mu_d}

so this is the ratio of time on two surfaces

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Answer:

The atomic model in which electrons are treated as waves is called the wave mechanical model of the atom or the quantum mechanical model of the atom. Principal energy levels contains energy sublevels

5 0
4 years ago
. Two parallel conducting plates are separated by 10.0 cm, and one of them is taken to be at zero volts. (a) What is the electri
exis [7]

Answer:

Explanation:

electrical field strength = potential diff / distance

= ( 450 - 0 ) / 8 x 10⁻²

= 5625 V/m

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potential difference = electric field x distance

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= 562.5 V

6 0
3 years ago
Which of these represent a velocity a.123 km/sec. b.34 m/min east
Allisa [31]
Velocity is a vector so it can have a magnitude and direction.

B. 34 m/min      east
   ^magnitude    ^direction

hope this helps :)



4 0
4 years ago
Read 2 more answers
If two measurements are very close to each other, then they are ____.
dimaraw [331]
I'd say b, precise, here.
If there's an error somewhere in the experiment or project, then it is consistently .... wrong. So, just 'cos you measure something precisely, it doesn't mean that you've measured it accurately. Maybe an example would be a measurement of length. If you used a metal ruler at zero degrees C, you can measure to say half a millimetre. A series of measurements of the same object would give very similar readings. But, if you used same metal ruler at, say 100 celsius (implausible) then you'd probably get a different set of readings. 'cos of the expansion of the metal ruler.
4 0
3 years ago
Read 2 more answers
A diffraction grating with 140 slits per centimeter is used to measure the wavelengths emitted by hydrogen gas. At what angles i
Degger [83]

Answer:

0.003181 radians

0.003005 radians

Explanation:

Number of slits = 140 /cm

λ = Wavelength = 434 nm = 434×10⁻⁹ m

m = 3 Third order spectrum

Space between slits

d=\frac{0.01}{140} =7.14\times 10^{-5}\ m

Now,

dsin\theta = m\lambda\\\Rightarrow \theta=sin^{-1}\left(\frac{m\lambda}{d}\right)\\\Rightarrow \theta=sin^{-1}\left(\frac{3\times 434\times 10^{-9}}{7.14\times 10^{-5}}\right)\\\Rightarrow \theta=sin^{-1}0.018228\\\Rightarrow \theta=0.01823^{\circ}=0.01823\times \frac{\pi}{180}=0.003181 radians

0.003181 radians

When λ = 410 nm = 410×10⁻⁹ m

dsin\theta = m\lambda\\\Rightarrow \theta=sin^{-1}\left(\frac{m\lambda}{d}\right)\\\Rightarrow \theta=sin^{-1}\left(\frac{3\times 410\times 10^{-9}}{7.14\times 10^{-5}}\right)\\\Rightarrow \theta=sin^{-1}0.01722\\\Rightarrow \theta=0.01722^{\circ}=0.01722\times \frac{\pi}{180}=0.003005 radians

0.003005 radians

5 0
4 years ago
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