Answer:
2100 J
Explanation:
Parameters given:
Force acting on the object, F = 420 N
Distance moved by object, d = 5m
The change in kinetic energy of an object is equal to the work done by a force acting on the object:
W = F * d
∆KE = F * d
∆KE = 420 * 5
∆KE = 2100 J
It is not only the horizontal part of the loop that dips
into the magnetic field. We can neglect or disregard the horizontal parts of
the loop that hollows into the magnetic fields since only the parts
perpendicular to the magnetic field complement to it.
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In this question, you are given the energy( 500,000btus) and the temperature difference( 100F-20F= 80F). You are asked to find the volume of water.
1 BTU mean 1 degree of F increased for 1 pound mass. First, we can calculate the mass of the water in lb unit. The calculation would be:
mass= energy/temperature increase = 500,000/80= 6250lb.
Then we need to convert the weight into gallons. The calculation would be:
6250lb x kg/2.204lb x 1kg/m3 x 264.172 gallons/m3= 3638969.3 gallons
Answer is lead, lead will heat up the fastest as it has the highest specific heat amongst the choices. The higher the specific heat of the substance the easier it is for that substance temperature to change for every mole of substance with respect to a degree in kelvin.
