Question 1 (1 point) Saved The elastic potential energy.r of an object may be negative True \\ (:3) False Question 2 (1 point) Saved If the cannonball is dropped from the tower, and air resistance is present, which statement is TRUE? The work clone by the force of air resistance is positive \\___/ The final speed at the moment the ball hits the ground is greater than if there '\\. _ ./I was no air resistance. (33, Air resistance does work as the ball falls, so the final mechanical energy of the cannonball is less than the initial mechanical energy Question 3 (1 point) Saved Your calculator, mass 149 grams falls from your desk to the floor, 60.0 cm below. What is the change in gravitational potential energy (in Joules] of the calculator? Give your answer with one digit precision. Your Answer: Answer Question 4 (1 point) Saved You drop a ball, mass 87 grams from a height of 103 cm. It bounces back to a height of 87' cm from the floor. What is the change in gravitational potential energy from the moment it is dropped, to the moment it reaches the maximum height from the bounce? Give your answer with a single digit of precision. Your Answer: 0.1 Answer Question 5 (1 point) Saved You hang a 250 gram mass from a vertical spring, and it stretches 9.1 cm from its equilibrium length. What is the spring constant, k, in me. Give your answer with one digit precision. Your Answer: Answer Question 6 (1 point) Saved A force 6.0 N does 22.7 Joules of work when displacing an object by a displacement D metres. If the angle between the force and the displacement is 29 degrees, calculate the displacement D in metres, with a single digit of precision. Your Answer: Answer Question 7 (1 point} An object of mass 2.7 kg is dropped from a height of 1.9 metres. It lands with a speed of 11.4 mfs. How much energy was lost due to air resistance? (Give your answer with one digit of precision, expressed as a magnitude) Your Answer: Answer Question 8 (1 point} Saved You wish to increase the speed a block of mass 4.0 kg from an initial speed of 4.1 m/s to a final speed of 11.6 mfs. How much work in Joules, has to be done on the block? Give your answer with two digits of precision. > vi L ) Your Answer: Answer Question 9 (1 point) An object of mass 32 kg is sliding horizontally with velocity 8.9 m/s. A force does negative work W = -31.6 Joules on the mass. Calculate the final speed of the object in m/s with two digits of precision. ->Vi F Your Answer: Answer Question 10 (1 point) In a pinball machine, a horizontal spring with a spring constant of 45 N/m, is compressed by 1.2 cm and is used to launch a ball of mass 24.2 grams horizontally. Calculate the speed of the ball immediately after launch, assuming that there are no non-conservative forces acting. Give the speed in m/s with one digit of precision. Your