Question

An ice rink (circular) is enclosed by a hemispherical dome. The ice and the dome are at 0°C and 15°C, respectively. The rink diameter is 25 m. The emmissivity of the ice is 0.6. What is the net radiative transfer in W?

Answer #1

At the center of a 50-mm-diameter circular ice rink, a 80 kg
skater traveling in the +y direction at 2.1 m/sm/s collides with
and holds onto a 63 kg skater who had been heading in the +x
direction at 3.0 m/sm/s .
A) How long will it take them to glide to the edge of
the rink? t=---------s?
B) Where will they reach it? Give your answer as an angle
measured counter-clockwise with respect to the +x axis
theta ---------? ∘...

A grain silo consists of a cylindrical concrete lower surmounted
by a mental hemispherical dome. The metal in the dome costs 1.7
times as much as the concrete(per unit of a surface area). If the
volume of the silo is 950 m^3, what are the dimensions of the
silo(radius and height of the cylindrical tower) that minimize the
cost of the materials? Assume the silo has no floor and no flat
ceiling under the dome.
-what is the function of...

A mass m slides on a frictionless ice rink. A circular wall
constrains it to move inside a fixed ring of radius R (Note:
gravity is irrelevant here; in the vertical direction the weight is
simply opposed by a normal force from the frictionless ice.) At t =
0, the puck is moving along the inside of the ring withh velocity
v0. The coefficient of friciton betweeen the puck and the wall is u
Find the differential equation obeyed by...

A 25-cm-diameter, 2.4 m-long vertical cilonder
containing ice at 0 °C is buried right under the ground. The
cylinder is thin-shelled and is made of a high thermal conductivity
material. The surface and the thermal conductivity of ground are 18
°C and 0.85 W/m °C respectively. Find rate of Heat transfer yo
cylinder in W.
a) Table 4.1 a or b: ?
b) Case: ?
c) Restriction: ??? m >> ??? m
d) Shape factor: S = ??? m
e)...

An 160.0 g hockey puck slides along an essentially frictionless
ice rink with speed 4.70 m/s. A hockey player uses her stick to do
–1.20 J of work on the puck. What is the puck's speed after she has
done this work? A. 0 m/s B. 2.66 m/s C. 3.50 m/s D. 4.53 m/s

You own an ice rink and are considering investing in a new high
speed Zamboni (ice resurfacing machine). This would require an
investment of $36,000 (the cost!). You are projecting that with the
new Zamboni, additional related annual net cash inflows (with more
available ice time for hockey leagues, skating parties, etc.) would
be $8,000 annually. The Zamboni is expected to have a 6 year useful
life with no salvage/residual value. (Percentage is 10%)
A. What is the expected simple...

Combustion gases passing through a 2.3-cm-internal diameter
circular tube are used to vaporize waste water at atmospheric
pressure. Hot gases enter the tube at 115 kPa and 250°C at a mean
velocity of 5 m/s, and leave at 150°C. If the average heat transfer
coefficient is 120 W/m2 °C and the inner surface temperature of the
tube is 112°C, determine the tube length. Answer in cm with two(2)
decimal places.

Carbon dioxide and nitrogen experience equimolar
counterdiffusion in a circular tube whose length and diameter are
1m and 50 mm respectively. The system is at a total pressure of
1atm and at a temperature of 25 C. The ends of the tubes are
connected to large chambers in which the species concentrations are
maintained at fixed values. The partial pressures of CO2 at one
endis 100 mm Hg, while at the other end it is 50 mm Hg. What is...

A 1 m outer diameter spherical tank made of AISI 304 steel with
10 cm wall
thickness contains solid iced water at 0°C. Air at 25°C flows
outside the tank with a
velocity of 1 m/s. Determine the rate of heat transfer to the tank
and the mass rate (
m_dot) at which ice melts. Ignore convection effects of the melting
ice.
The latent heat of fusion of water at 0°C is 333.7 kJ/kg.
Thanks!

In 1986, a gargantuan iceberg broke away from the Ross Ice Shelf
in Antarctica. It was approximately a rectangle 165 km long, 45.0
km wide, and 250 m thick.
(a) What is the mass of this iceberg in kg, given that the
density of ice is 917 kg/m3?
?kg
(b) How much heat transfer (in joules) is needed to melt it?
?J
(c) How many years would it take sunlight alone to melt ice this
thick, if the ice absorbs...

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