A conservative force F S is in the +x-direction and has magnitude F1x2 = a>1x + x022 , where a = 0.800 N # m2 and x0 = 0.200 m. (a) What is the potential-energy function U1x2 for this force? Let U1x2 S 0 as x S . (b) An object with mass m = 0.500 kg is released from rest at x = 0 and moves in the +x-direction. If F S is the only force acting on the object, what is the objects speed when it reaches x = 0.400 m?
• Blood • Role of Blood – Maintains balance (homeostasis) of the body – Transports material to and from cells – Buffers changes in pH – Carries excess heat to the body surface – Plays a role in the defense system – Minimizes blood loss • Blood Components – Plasma – fluid 50-55% of blood – Red Blood Cells (erythrocytes) – White Blood Cells (leukocytes) – Platelets ‘thrombocytes’ (hemostasis; stops bleeding) • Fig. 19.2(TE Art) • Plasma – Carries heat – Electrolytes (ions) – Nutrients (glucose, amino acids, lipids & vitamins) – Waste products (creatine, bilirubin, urea) – Dissolved gases (O and2Co ) 2 – Hormones – Plasma proteins • Albumin- trans