Question

A small metal bar, whose initial temperature was 30° C, is dropped into a large container of boiling water. How long will it take the bar to reach 80° C if it is known that its temperature increases 2° during the first second? (The boiling temperature for water is 100° C. Round your answer to one decimal place.)

sec

How long will it take the bar to reach 95° C? (Round your answer to one decimal place.)

sec

Answer #1

A
small metal bar, whose initial temperature is 20 ℃, is dropped into
a container containing boiling water (at 100 ℃) and its temperature
increases 2 ℃ in 1 second. Determine the temperature of the metal
bar after 10 seconds. How much time should we spend for the sea
slug temperature of 60 ℃?

Two large containers A and B of the same size
are filled with different fluids. The fluids in containers
A and B are maintained at 0° C and 100° C,
respectively. A small metal bar, whose initial temperature is 100°
C, is lowered into container A. After 1 minute the
temperature of the bar is 90° C. After 2 minutes (since being
lowered into container A) the bar is removed and instantly
transferred into the other container. After 1 minute...

A
pizza with a temperature of 90 degrees C is taken to a dining room
whose temperature is 60 degrees C. If after 5 minutes the
temperature had dropped to 10 degrees C, how long would it take to
reach a temperature of 65 degrees C? 0 degrees C?

Consider two 35-gram ice cubes, each initially at -5°C. One is
dropped into a at container filled with 0.1 kg of liquid nitrogen
(initially the boiling point of nitrogen); the other cube is
dropped into a container filled with 1 kg of (liquid) water,
initially at 5°C. Assume that no heat is lost through either
container (or into the atmosphere).
1.Determine the final (equilibrium) temperature of the
icewater mixture.
2. Determine the phase (ie., liquid or solid) corresponding to
the...

A gas sample enclosed in a rigid metal container at room
temperature (20.0∘C) has an absolute pressure p1. The container is
immersed in hot water until it warms to 40.0∘C. What is the new
absolute pressure p2? Express your answer in terms of p1.
p2=_________________

7. Calorimetry A piece of metal has mass 100 grams and an
initial temperature of 100'C. lt is placed in an insulated
container of mass 200 grams which contains 500 grams of water at an
initial temperature of 17 .3"C. The container is made of the same
material as the metal sample. lf the final temperature is 22.7'C,
what is the specific heat capacity of this metal? How many calories
('1 cal = 4.186 J) are required to warm the...

Consider two 35-gram ice cubes, each initially at -5°C. One is
dropped into a at container filled with 0.1 kg of liquid nitrogen
(initially the boiling point of nitrogen); the other cube is
dropped into a container filled with 1 kg of (liquid) water,
initially at 5°C. Assume that no heat is lost through either
container (or into the atmosphere)
a) Describe what happens to each ice cube (and why)
b) If (Lv)Nitrogen =48 kcal/kg, (LF)Nitrogen = 6.1 kcal/kg,
and...

Consider two 35-gram ice cubes, each initially at -5°C. One is
dropped into a at container filled with 0.1 kg of liquid nitrogen
(initially the boiling point of nitrogen); the other cube is
dropped into a container filled with 1 kg of (liquid) water,
initially at 5°C. Assume that no heat is lost through either
container (or into the atmosphere)
a) Describe what happens to each ice cube (and why)
b) If (Lv)Nitrogen =48 kcal/kg, (LF)Nitrogen = 6.1 kcal/kg,
and...

A thermometer is removed from a room where the temperature is
23° C and is taken outside, where the air temperature is −10° C.
After one-half minute the thermometer reads 12° C. What is the
reading of the thermometer at
t = 1 min?
(Round your answer to two decimal places.)
= ° C
How long will it take for the thermometer to reach −8° C? (Round
your answer to two decimal places.)
= min

A metal block of weight 50 kg heated to a uniform temperature of
227 degree C is thrown into a large lake at 12 degree C. a)
Determine the entropy change of the block, b) the entropy change of
the lake water and c) the entropy generated during this process.
Take c_p(metal) = 0.45kJ/kg.K. (Answers in two decimal points).
3 points
Your answer

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 1 minute ago

asked 11 minutes ago

asked 18 minutes ago

asked 33 minutes ago

asked 37 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago