Calculate the heat gained by 100 grams of ice at -20°c in order to become water at 50°c. ( c = .5 for ice and c = 1 for water, q = m. с.δt)

Need in all of themmm only answer if you know plsssss

What type of electromagnetic wave is used in security pens? a. x-rays c. microwaves b. visible light d. ultraviolet radiation select the best answer from the choices provided

Part a constants huck finn walks at a speed of 0.60 m/s across his raft (that is, he walks perpendicular to the raft's motion what is huck's velocity (speed and direction) relative to the river bank? express your answer to three significant figures and include the appropriate units. relative to the shore)