# Physic Questionnaire

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Thu 16 Dec 2:07 PM
HKUST Canvas – Quiz: Part 10 x
PHYS1112_final_formulae.pdf
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TD课程中心 10min 园国际及专业考试网. HKUST Canvas
Take acceleration or gravity on Earth as ge4.80 m/s.
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Question 7
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A heavy block is hung vertically down with a thin 10-g wire that is 65.0 cm long from the ceiling.
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The lower end of the wire, where the block is, is fixed in position (not moving).
The block is much heavier than the wire such that the small variations of tensions along the
wire due to the mass of the wire can be ignored.
The linear mass density of the wire remains uniform.
When you gently pluck the upper end of the wire, a pulse travels down the wire and returns 10.24
ms later, having reflected off the lower end. If we now set the wire in vibration in its second
harmonic, what is the frequency of the vibration?
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0765 Hz
195 Hz
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383 Hz
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255 Hz
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0 128 Hz

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Thu 16 Dec 2:14 PM
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HKUST Canvas – Quiz: Part 10 x
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An object with surface area Ar at 750°C can transfer heat to its surroundings at 20°C by radiation
or by conduction. It is a perfect emitter such that the emissivity is e = 1. The rate of heat flow by
radiation, HR, is given by the Stefan-Boltzmann law. The rate of heat flow by conduction through a
copper rod attached firmly to the object is Hc. The rod has length L = 50 cm, cross-sectional area
Ac, and thermal conductivity of kcu = 385.0 W/m.K. For what value of the area ratio Ac/Ar will HR
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(Ignore absorption of radiation from the environment by the object.)
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750 C
20 C
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O 8.0 x 10-2
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O 1.6 x 10-2
O=
O 6.4 x 10-2
0.11
T
O 3.2 x 10-2
7
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Thu 16 Dec 2:22 PM
HKUST Canvas – Quiz: Part 10 x
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canvas.ust.hk/courses/40008/quizzes/60121/take/questions/465133
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Attempt due: Dec 16 at 2:33pm
7 Minutes, 26 Seconds
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All frictions can be neglected unless it is specified explicitly in the questions.
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Take acceleration of gravity on Earth as g = 9.80 m/s2.
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Question 9
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An object with mass m initially moves at a constant velocity vo on a frictionless surface and
collides with a spring. The spring is finally compressed by a length d from its natural length when
the object comes to a stop momentarily. Find the kinetic energy of the object, in terms of m and
Vo, when the compressed length of the spring is d/4.
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omv
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O muz
3. mv
o įmva

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Thu 16 Dec 2:26 PM
HKUST Canvas – Quiz: Part 1 o X
PHYS1112_final_formulae.pdf
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TD课程中心 10min 国际及专业考试网.. HKUST Canvas HKUST – myPortal…
ATTICIONIS call be neglecteu uimess TLTS Specirteu expliCILIY III e questionTS.
3 Minutes, 9 Seconds
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Take acceleration of gravity on Earth as g = 9.80 m/s2
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An isolated system consists of 100 grams of ice at T(ice)initial = 0.0°C in contact with 100 grams of
liquid water at T(water)initial = 5.0°C. What is the final temperature of the system, Tfinal, after it
comes into thermal equilibrium? The specific heat capacities are c(ice) = 2100 J/kgk and c(water) =
4190 J/kgk and the specific latent heat of fusion for the transformation between ice and water is
Lp = 334 x 103 J/kg.
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0 0.0°C
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O 3.3°C
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O 2.7°C
0.6°C
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Thu 16 Dec 2:34 PM
HKUST Canvas – Quiz: Part 2 x
PHYS1112_final_formulae.pdf
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Attempt due: Dec 16 at 3:38pm
59 Minutes, 51 Seconds
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All frictions can be neglected unless it is specified explicitly in the questions.
Take acceleration of gravity on Earth as g = 9.80 m/s2
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The vertical displacement of a horizontal stretched string from its equilibrium position is given by
y(x, t) = = Ym cos(-kx – wt)
where w and k are both positive. The velocity of the wave is:
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O klw along the +x direction
O none of the rest
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O w/k along the -x direction
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O wlk along the +x direction
O klw along the -x direction
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Thu 16 Dec 2:39 PM
HKUST Canvas – Quiz: Part 2 x
PHYS1112_final_formulae.pdf
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Attempt due: Dec 16 at 3:38pm
54 Minutes, 42 Seconds
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All frictions can be neglected unless it is specified explicitly in the questions.
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Take acceleration of gravity on Earth as g = 9.80 m/s2.
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A classical solid containing ng = 5.0 moles of atoms at temperature Ts is placed in an isolated
environment of volume V filled with ng = 10.0 moles of monoatomic ideal gas at temperature TG =
0.90 Ts. After heat flow from solid to gas brings the system to equilibrium, the temperature of the
combined solid-gas system is TF. Which one of the followings concerning Te is correct? It is given
that no change of phase results from this heat flow.
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O 0.98Ts
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