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Question 1 The density of gold is 19 300 kg/m³. What is the mass of a gold sphere whose diameter is 0.25 m? A) 87.5 kg C) 947 kg E) 3790 kg B) 158 kg D) 1260 kg Question 2 Within a certain type of star called a neutron star, the material at the center has a mass density of 1.0 x 1018 kg/m³. If a tiny sphere of this material of radius 1.0 x 10-5 m were somehow transported to the surface of the earth, what would be the weight of this sphere? A) 1000 N B) 4200 N C) 4.1 x 104 N D) 7.0 × 104 N E) 3.8 × 10⁹ N Question 3 An ice cube, r = 917 kg/m³, is sliding down a frictionless incline as shown in the drawing. The sides of the cube each have a length of 0.75 m. What pressure does the cube exert on the incline? A) 1800 Pa B) 6500 Pa C) 3600 Pa D) 2700 Pa E) 5100 Pa 16⁰