mbm said:Homework Statement
suppose you had to carry ten 30lb concrete blocks up a 24ft ladder, to build a chimney. if you were paid for the work that you did on the blocks at the same price as electrical energy costs (14 cent kWh). how much money would you make from this job.
Homework Equations
energy = power x time
The Attempt at a Solution
should it be assumed that the whole time is an hour? or is there a way to calculate time
When time is not given, energy can be calculated by using the formula E = P x t, where E is the energy in joules, P is the power in watts, and t is the time in seconds.
The units used for energy calculation with no time given are joules (J). Other commonly used units include kilojoules (kJ) and watt-hours (Wh).
Yes, energy can be calculated without knowing the time as long as the power or work done is known. Time is a factor in the formula for energy, but it can be eliminated if it is not given.
Energy and power are related, but they are not the same. Energy is the ability to do work, while power is the rate at which energy is used or transferred. In other words, energy is a measure of the amount of work done, while power is a measure of how quickly the work is done.
Energy calculation with no time given is commonly used in situations where the energy consumption or production is known, but the time it takes to use or produce the energy is not relevant. This can include calculating the energy usage of appliances, the power output of a generator, or the energy stored in a battery.