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Q: What is the weight of a 900 x 600 slab of concrete?
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What is the average voltage of a full-wave rectifier if the peak voltage is 900 volts?

between 900 and 600 depending on load and capacitance


How many hours of charge can 600 mAh hold?

A 600 mAh battery can produce 75 mA for about 8 hours. If it is called upon to deliver 600 mA, it will last somewhat less than one hour. This is because ampere-hour ratings for batteries are, by standard agreement, normalized to an eight-hour rate. The actual rating is only a comparative rating, so you could properly say that a 900 mAh battery, for instance, will last 1.5 times longer than a 600 mAh battery.


A 60kg platform is 8m wide supported by 4 legs each of which are 2m from the edge of the platform What is the force on the left legs if a 30kg mass is placed on the left edge of the platform?

This problem asks to solve for unknown forces when an object is in equilibrium. Let us solve it! As platform is in equilibrium , so , by 1st condition of equilibrium, Upward forces = Downward forces T1+T2=600+300=900N , Now apply second condition, Anti-clockwise torque= Clockwise torque (taking point of first leg as axis of rotation so that torque due to T1 is zero) 300*2+T2*4=600*2 600-1200=-T2*4, 600=T2*4, or T2=600/4=150N ,now T1=90-T2=900-150=750N


What is 100 plus 900?

900 + 100 = 1000


Can you have 2 heaters with different watts give the same BTu's example of heaters-both 13650BTu 1240 volt radiator with settings for 600 900 1500 watts or a 24000watt 240 volt fan forced electic?

no you can not it would ruin your system for good. You have to get a heaters with the same watts