A. Two objects coming in contact with each other
Radiation - it travels in all directions so when you place your hands above a fire radiation hits your hand and reveals to ur cells where they transfer that hear into electrical signals, making you feel heated
Answer:B=Negative C=Positive D=Positive
Explanation:objects that repel each other means they have the same polarity. objects that attract have the opposite polarity A is negatively charged if A and B repel then A and B are both negative. B is negatively charged if B and C attract then they have reverse polarity which makes C positively charged. C is positive if C and D repel then that means that C and D have the same polarity making D positively charged.
Reduce the amount of waste- whether this is light, heat or sound waste.
Reduce the amount of friction that the machine is making
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h = 0 when the ball hit the ground, so
<span>0 = rt - 16t^2 </span>
<span>Since r = 32, </span>
<span>0= 32t - 16t^2 </span>
<span>16t(2 - t) = 0 </span>
<span>t = 0 or 2 </span>
<span>At t=0, h=0 but the ball hasn't left the ground yet. </span>
<span>Thus, the answer is 2.</span>