Final answer:
The physics equation i cross j results in the unit vector k, and j cross j is 0, thus i cross j cross j simplifies to 0. The '100 js g' part of the question is unclear and might be a typo. For unit conversions, 1 watt is equivalent to 1 J/s, and energy in Joules is computed by multiplying power in watts by time in seconds.
Step-by-step explanation:
The question seems to be about simplifying a vector cross product and is related to the subject of Physics, likely at the high school level. Regarding the cross product of unit vectors in physics, using the right-hand rule, we know that ī cross ī and ķ cross ķ both equal zero since the cross product involves the sine of the angle between vectors and here the vectors are parallel. For unit vectors, ī cross ķ equals k, which is a unit vector in the z-direction, because they are orthogonal and the sine of 90° is 1. Hence, i cross j simply results in k. When we further cross this with another j-vector, the result is 0 because j cross j is 0.
The '100 js g' part of the initial statement is unclear and may be a typo, so we cannot provide a specific answer to that without clarification. Therefore, based on the information given, i cross j cross 100 js g simplifies to 0. Note that in the realm of energy (Joules - J), the cross product is not applicable as it's a scalar quantity, not a vector.
When encountering a question that involves rendering formulas into applicable energy units (such as converting watt-hours to Joules), remember that 1 W equals 1 J/s. For example, 20W would be 20 J/s. To find the energy over a period of time, you would convert the time to seconds and then multiply by the power in watts to obtain energy in Joules.