A rock is dropped from high above the surface of the Earth. The initial speed is 0, and the initial height above the surface is NxRg where Rg is the radius of the Earth. Calculate the speed of the rock when it hits the upper atmosphere, say at height 20 km above the surface. DATA for the Earth: radius Rg = 6.38 x 10 m; mass M = 5.98 x 1024 kg. N = 9; (in m/s) OA: 7.258x103 OB: 1.052x104 OC: 1.526x104 OD: 2.213x104 OE: 3.208x104 OF: 4.652x104 OG: 6.746x104 OH: 9.781x104

The magnitude F (in newtons) of a force F and the magnitude G (in newtons) of a force G satisfy the vector equation 2Fi-3Fj+2Gi+2Gj-3i=0 where i and j are the Cartesian unit vectors. What is the value of F? 9 10 3 O 5/60/5 10 06

The car travels around the circular track having a radius of r = 300 m such that when it is at point A it has a velocity of 8 m/s, which is increasing at the rate of v = (0.08t) m/s², where t is in seconds. (Figure 1) Figure A X 1 of 1 Part A Determine the magnitude of the velocity when it has traveled one-third the way around the track. Express your answer to three significant figures and include the appropriate units. V = Submit Part B Value a = μA 0 Submit Request Answer Determine the magnitude of the acceleration when it has traveled one-third the way around the track. Express your answer to three significant figures and include the appropriate units. O μÀ Value Units Request Answer ? Units ?

A plane flies at a speed of 360 mph on a bearing of S45°E. Relative to the ground, the plane's speed is measured as 335 mph with a true bearing of S35°E. Round answers to the nearest whole unit.