Taking into account the definition of calorimetry and sensible heat, the amount of energy required is 68.8 J.
<h3>Calorimetry</h3>
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
<h3>Sensible heat</h3>
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
In this way, between heat and temperature there is a direct proportional relationship. The constant of proportionality depends on the substance that constitutes the body and its mass, and is the product of the specific heat by the mass of the body.
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where:
- Q is the heat exchanged by a body of mass m.
- c is the specific heat substance.
- ΔT is the temperature variation.
<h3>Energy required in this case</h3>
In this case, you know:
- Q= ?
- c= 0.215
- m= 20 g
- ΔT= Tfinal - Tinitial= 88 C - 72 C= 16 C
Replacing in the definition of sensible heat:
Q = 0.215 × 20 g× 16 C
Solving:
<u><em>Q=68.8 J</em></u>
Finally, the amount of energy required is 68.8 J.
Learn more about calorimetry:
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Answer:
(a) 0.6 radians
(b) 6.27 cm
(c) 1.05 m
Explanation:
(a) The length of an arc is given as:
s = rθ
where r = radius of the circle
θ = angle subtended by the arc (in radians)
Therefore, the angle, θ, will be:
θ =
θ =
θ = 0.6 radians
The angle subtended by the circular arc is 0.6 radians.
(b) Using the same formula, we have that radius, r, is given as:
r = s/θ
But θ is in radians and the angle we have is in degrees (128°). Hence, we convert 128° to radians:
128° = radians = 2.234 radians
Therefore, r is:
r = 14/2.234
r = 6.27 cm
The radius of the circle is 6.27 cm.
(c) Using the same formula, we have that:
s = rθ
s = 1.5 * 0.7
s = 1.05 m
The length of the arc is 1.05 m.
Answer:
Resistance become infinite
Explanation:
In series circuit when switch is closed then a current is flow which is equal to , here V is voltage and R is resistance
But when switch is open then no current is flow in the circuit
So , this is possible when resistance become infinite
So when switch is open then resistance of the circuit will become infinite
Answer:
The current is
Explanation:
From the question we are told that
The magnetic field is
The first length is
The second length is
The first width is
The second width is
The time interval is
The resistance is
Generally the first area is
=>
=>
The second area is
=>
=>
Generally the induced emf is mathematically represented as
This negative show that it is moving in the opposite direction of the motion producing it
=>
=>
The induced current is
=>
=>