9. (1 point) In the fission reaction shown below, what is the value of x? 92 235 U ton -736 Kr +56 Ba + con A. 1 B. 2 C. 3 D. 4 10. (1 point) Which of the following nuclear reactions is the main process for energy production in the core of the Sun? A. Alpha Decay B. Gamma Decay C. Nuclear Fission D. Nuclear Fusion5. (1 point) Energy is added to a substance, such that its temperature rises from 10"C to 50"C. What is its change in temperature in kelvin? A. 40 K B. 80 K C. 233 K D. 313 K 6. (1 point) The term used to describe the transfer of thermal energy that occurs when warmer objects are in physical contact with colder objects is A. thermal convection B. thermal induction C. thermal radiation D. thermal conduction 7. (1 point) The graph below shows the temperature of a solid with a melting point of 35.C. A 2.0 kg sample of the solid is heated at a constant rate. What is the specific heat capacity of the solid? 50 45 40 35 - Temperature (C) 15,000 30,000 45,000 60,000 75,000 90,000 105,000 120,000 Energy (J) A. 1.5 x 104 J kg 1.C-1 B. 1.5 x 103 J kg 1.C-1 C. 7.5 x 103 Jkg-1 . C-1 D. 7.5 x 102 J kg-1. C'-1 (1 point) What type of decay is represented by the general nuclear reaction below? EX -2_1 Ytie+ve A. Positron Emission (B+ Decay) B. Electron Capture C. Electron Emission (8- Decay) D. Gamma DecayChoose one and only one answer. Choose the answer which is most correct. You do not need to show your work. 1. (1 point) A girl pulls a 80.0 kg wagon from rest using the metal handle, with a force of 690 N at an angle of 0 to the horizontal. If the girl uses 5.0 x 10* J of energy to move the wagon 8.0 m, what is the value of 0? A. 650 B. 250 C. 53 D. 37 2. (1 point) An archer pulls back a 500 g arrow on a bowstring using an average force of 210 N to draw the string back 30 cm. If there is no friction, with what speed will the arrow leave the bow when it is released. A. 5.0 m/s B. 0.50 m/s C. 160 m/s D. 16 m/s 3. (1 point) An object released from a height h strikes the ground with a velocity v. If the same object is now released from a height 2h, with what velocity will it hit the ground? The effects of air resistance can be neglected. A. V2 B. V2v C. 2v D. 4v 4. (1 point) A lift (elevator) is operated by an electric motor. It descends form the 10th floor to the 2nd floor at a constant speed. Which of the following is a valid energy transformation during this journey? A. gravitational potential energy - kinetic energy B. electrical energy -+ kinetic energy C. electrical energy -+ thermal energy D. kinetic energy - thermal energy