A block of wood has density 0.500 g/cm3 and mass 2 000 g. It floats in a container of oil (the oil's density is 0.750 g/cm3). Wh
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Answer:
T_final = 279.4 [°C]
Explanation:
In order to solve this problem, we must use the following equation of thermal energy.
where:
Q = heat = 9457 [cal]
m = mass = 79 [g] = 0.079 [kg]
Cp = specific heat = 0.5 [cal/g*°C]
T_initial = initial temperature = 40 [°C]
T_final = final temperature [°C]
A) Upward
In order to find the direction of the magnetic force on the wire, we can use the right-hand rule: the index finger, the middle finger and the thumb of the right hand must be placed all of them perpendicular to each other.
So we have:
- Index finger: direction of current in the wire (from west to east)
- Middle finger: direction of magnetic field (from south to north)
- Thumb: direction of the force --> so it will be upward
So, the force will point upward.
B)
The magnitude of the force exerted by the magnetic field on the wire is given by
where
I = 1.50 A is the current in the wire
L = 2.20 m is the length of the wire
Substituting into the equation, we find