Please answer q8, 9, 10, 11 and 12 and fully explaination. Please see the table belown to know about the result.

8. The force of gravity between two objects is 120 N. If the mass of one object is tripled and the distance between their centres is halved, then find the new force of gravity between them. 9. A 19.0 kg curling stone is travelling at 3.0 m/s [N] along the smooth ice when it hits an opponent's stone that is at rest. (Both stones have the same mass.) The opponent's stone rolls off at a velocity of 1.8 m/s [N 22. W]. Determine the percentage of kinetic energy lost during the collision and comment on how close this collision is to being elastic. 10. A 490 g dynamics cart is held at rest next to a Hooke's Law spring that is compressed by 44.0 cm. The spring has a force constant of 150 N/m. The cart is released and travels along a horizontal surface; the surface is smooth except for a 1.0 m rough patch where a 4.0 N force of friction acts. The cart then travels along a frictionless incline. What is the maximum height (h) reached by the cart, above the horizontal surface? rough patch 1- 1.0 m 11. With what upward velocity must an object be launched from the Earth's surface, in order to reach a maximum height of 2500 km above the surface? 12. A 550 g ball is thrown down, at a speed of 3.0 m/s, from a height of 2.2 m above a vertical spring of force constant 1.1 x 10 N/m. What will be the maximum compression in the spring? T 2.2 m 13. Two electrons are held 2.0 um apart. If the electrons are released from rest, then how fast will they be travelling when they are 5.0 um apart? 14. Two particles are given identical charges. The force of electrostatic repulsion between them is 4.1 x 1012 N when they are separated by a distance of 3.0 cm. Find the charges. 15. A 1200 kg satellite is orbiting Earth at an altitude of 2500 km. If the satellite has a stable circular orbit then what is its period of rotation? ANSWERS TO REVIEW 1 39 m/s [ 63 to the ground] 11 5.9 x 103 m/s 2 13 m/s [N 18 W] 12 17 cm 3 2.3 x 102 m 13 8.7 x 103 m/s 4 17 m/s [310 up from ground] 14 6.4 x 10-13 C 5 0.42 m/s 15 2.3 h 6 0.43 m/s? [up] 16 6.7 x 10' N/C [E 70'S] 7 1.6 m/s 17 480 nm 8 1.4 x 103 N 18 1.3 x 105 m 9 39% is lost 19 1.9 x 104m 10 2.2 m 20 1.1 x 10 m