6. A block whose weight is w is pushed to the left across a level 60 N surface at a constant velocity by a force of 60 newtons that is 30 inclined to the horizontal at an angle of 30, as shown. The coefficient of kinetic friction between the block and the surface is 0.50. What is the magnitude of the weight of the block? 7. A mass of 78.0 kilograms is suspended in equilibrium with three "LLLLLLLLLLLLLLL 550 ropes of negligible mass, as shown. Find the tensions 7, and T2. T1 T2 78.0 kg 8. An automobile slowed down at a constant rate from 46 meters per second to 2.0 meters per second in 5.0 second (a) Find the acceleration of the automobile. (b) Find the distance the automobile traveled in 5.0 seconds. 9. One food calorie is equivalent to 4186 joules of energy. Lifting a 31-newton weight vertically a distance of meters requires the expenditure of 93 joules of energy. If Tycho lifted the weight 120 times, how many food calo of energy would be expended? 10. The specific heat of gold is 129 joules per kilogram per Celsius degree. Find the amount of heat energy in jou required to raise the temperature of 6.0 kilograms of gold 36 kelvins