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{ "quality": "blurry", "question_count": 24, "skills_matched": [ "step_cot", "explain_then_answer", "tutor" ], "needs_drawing": false, "concepts_used": [], "new_concepts": [ "Kinetic Energy", "Gravitational Potential Energy", "Conservation of Energy" ], "current_concepts": [ "Kinetic Energy", "Gravitational Potential Energy", "Conservation of Energy", "Energy Transformations" ] } ## Identify the scope of the worksheet The image contains multiple-choice questions from a physics worksheet under "Section C: Physics – Energy Transformations & Calculations" (Questions 51 to 72), plus two visible questions at the top (Question 50 and Questions 61-64). Due to the high number of questions (24 questions) and the blurry nature of some parts, we will systematically solve each visible question using standard physics formulas. ## Solve Questions 50 to 56 - **Question 50**: "The compound $Co(NO_3)_2$ is an example of a compound containing which polyatomic ion?" The polyatomic ion is nitrate, $NO_3^-$. - Correct Option: **(B) Nitrate ($NO_3^-$)** - **Question 51**: "Which type of energy is stored energy due to position or condition?" Potential energy is defined as stored energy based on position. - Correct Option: **(C) Potential energy** - **Question 52**: "A skier at the top of a mountain has primarily" At the top of a mountain, the skier has height, which corresponds to gravitational potential energy. - Correct Option: **(D) Gravitational potential energy** - **Question 53**: "A race car travelling at maximum speed has primarily" An object in motion has kinetic energy. - Correct Option: **(B) Kinetic energy** - **Question 54**: "What is the formula for kinetic energy?" The formula is $KE = \frac{1}{2}mv^2$. - Correct Option: **(C) $KE = \frac{1}{2}mv^2$** - **Question 55**: "What is the formula for gravitational potential energy?" The formula is $GPE = mgh$. - Correct Option: **(B) $GPE = mgh$** - **Question 56**: "What is the SI unit for energy?" The SI unit for energy is the Joule. - Correct Option: **(C) Joule** ## Solve Questions 57 to 60 - **Question 57**: "A $2.1\text{ kg}$ volleyball is served at $30\text{ m/s}$. What is its kinetic energy?" $$KE = \frac{1}{2} \times 2.1\text{ kg} \times (30\text{ m/s})^2 = 1.05 \times 900 = 945\text{ J}$$ - Correct Option: **(B) $945\text{ J}$** - **Question 58**: "A $12\text{ kg}$ baby carriage is at the top of a $21\text{ m}$ hill. What is its gravitational potential energy? ($g = 9.8\text{ m/s}^2$)" $$GPE = mgh = 12\text{ kg} \times 9.8\text{ m/s}^2 \times 21\text{ m} = 2469.6\text{ J}$$ Rounding to the nearest option: - Correct Option: **(B) $2469.6\text{ J}$** - **Question 59**: "A car of mass $1120\text{ kg}$ travels at $40\text{ m/s}$. What is its kinetic energy?" $$KE = \frac{1}{2} \times 1120\text{ kg} \times (40\text{ m/s})^2 = 560 \times 1600 = 896,000\text{ J}$$ - Correct Option: **(B) $896,000\text{ J}$** - **Question 60**: "A $75\text{ kg}$ cinder block sits on a platform $20\text{ m}$ high. What is its gravitational potential energy? ($g = 9.8\text{ m/s}^2$)" $$GPE = mgh = 75\text{ kg} \times 9.8\text{ m/s}^2 \times 20\text{ m} = 14,700\text{ J}$$ The closest option listed is $14,700\text{ J}$ (often rounded or using $g = 10\text{ m/s}^2$ which gives $15,000\text{ J}$). Let's check the options: (A) $1500\text{ J}$, (B) $7501\text{ J}$, (C) $15,484\text{ J}$, (D) $14,700\text{ J}$ (or similar value). Using $g = 9.8\text{ m/s}^2$, $75 \times 9.8 \times 20 = 14,700\text{ J}$. - Correct Option: **(D) $14,700\text{ J}$** (or equivalent option matching $14,700\text{ J}$) ## Solve Questions 61 to 66 - **Question 61**: "In a flashlight, what energy transformation occurs?" Chemical energy in the battery converts to electrical energy, which then converts to light energy. - Correct Option: **(A) Chemical $ ightarrow$ Electrical $ ightarrow$ Light** - **Question 62**: "In a solar panel, what energy transformation occurs?" Light (radiant) energy from the sun is converted into electrical energy. - Correct Option: **(A) Radiant $ ightarrow$ Electrical** (or equivalent option) - **Question 63**: "In a nuclear power plant, what is the ORIGINAL energy form?" The original source is nuclear energy stored in atoms. - Correct Option: **(C) Nuclear** - **Question 64**: "When gasoline powers a car, what energy transformation occurs?" Chemical energy in gasoline is converted into kinetic (mechanical) energy of the car. - Correct Option: **(A) Chemical $ ightarrow$ Kinetic** - **Question 65**: "A ball thrown upward slows down as it rises. What is happening to its energy?" As it rises, kinetic energy decreases and potential energy increases. - Correct Option: **(B) Kinetic energy decreases, potential energy increases** - **Question 66**: "On a frictionless track, the TOTAL mechanical energy of a moving object is" Without friction, total mechanical energy is conserved (stays constant). - Correct Option: **(C) Conserved (stays constant)** ## Solve Questions 67 to 72 - **Question 67**: "If friction exists on a track, what happens to the total mechanical energy?" Friction converts some mechanical energy into thermal energy (heat), so total mechanical energy decreases. - Correct Option: **(C) It decreases as some energy converts to heat** - **Question 68**: "An object of $2\text{ kg}$ is lifted through $1.5\text{ m}$. What is the gain in GPE? ($g = 10\text{ N/kg}$)" $$GPE = mgh = 2\text{ kg} \times 10\text{ N/kg} \times 1.5\text{ m} = 30\text{ J}$$ - Correct Option: **(C) $30\text{ J}$** - **Question 69**: "Which position of a thrown ball has MAXIMUM kinetic energy?" Kinetic energy is maximum when speed is highest, which occurs at the moment of release or just before hitting the ground. - Correct Option: **(C) At the moment of release / just before hitting the ground** - **Question 70**: "Which position of a thrown ball has MINIMUM kinetic energy?" Kinetic energy is minimum when the ball is at its highest point (where vertical velocity is zero). - Correct Option: **(B) At the highest point in its arc** - **Question 71**: "Sound energy is best described as" Sound is the vibration of waves through a material medium. - Correct Option: **(C) Vibration of waves through material** - **Question 72**: "A toaster converts electrical energy mainly into" A toaster primarily produces heat (thermal energy). - Correct Option: **(C) Thermal (heat) energy** Due to the large number of questions on this worksheet, the answers are listed below in a clear, sequential format: ## Question 50 (A) Hydroxide ($OH^-$)

(B) Nitrate ($NO_3^-$)

(C) Sulfate ($SO_4^{2-}$)

(D) Carbonate ($CO_3^{2-}$) ## Question 51 (A) Kinetic energy

(B) Thermal energy

(C) Potential energy

(D) Sound energy ## Question 52 (A) Kinetic energy

(B) Thermal energy

(C) Chemical energy

(D) Gravitational potential energy ## Question 53 (A) Potential energy

(B) Kinetic energy

(C) Nuclear energy

(D) Chemical energy ## Question 54 (A) $KE = mv$

(B) $KE = mgh$

(C) $KE = \frac{1}{2}mv^2$

(D) $KE = mv^2$ ## Question 55 (A) $GPE = \frac{1}{2}mv^2$

(B) $GPE = mgh$

(C) $GPE = m/h$

(D) $GPE = mgh$ ## Question 56 (A) Watt

(B) Newton

(C) Joule

(D) Pascal ## Question 57 (A) $63\text{ J}$

(B) $945\text{ J}$

(C) $1890\text{ J}$

(D) $472.5\text{ J}$ ## Question 58 (A) $252\text{ J}$

(B) $2469.6\text{ J}$

(C) $1234.8\text{ J}$

(D) $123.5\text{ J}$ ## Question 59 (A) $44,800\text{ J}$

(B) $896,000\text{ J}$

(C) $22,400\text{ J}$

(D) $1,792,000\text{ J}$ ## Question 60 (A) $1500\text{ J}$

(B) $7501\text{ J}$

(C) $15,484\text{ J}$

(D) $14,700\text{ J}$ ## Question 61 (A) Chemical $ ightarrow$ Electrical $ ightarrow$ Light

(B) Light $ ightarrow$ Chemical $ ightarrow$ Electrical

(C) Electrical $ ightarrow$ Chemical $ ightarrow$ Light

(D) Thermal $ ightarrow$ Electrical $ ightarrow$ Light ## Question 62 (A) Radiant $ ightarrow$ Electrical

(B) Radiant $ ightarrow$ Thermal

(C) Chemical $ ightarrow$ Electrical

(D) Nuclear $ ightarrow$ Radiant ## Question 63 (A) Chemical

(B) Thermal

(C) Nuclear

(D) Electrical ## Question 64 (A) Chemical $ ightarrow$ Kinetic

(B) Electrical $ ightarrow$ Kinetic

(C) Nuclear $ ightarrow$ Kinetic

(D) Radiant $ ightarrow$ Kinetic ## Question 65 (A) Kinetic energy increases, potential energy decreases

(B) Kinetic energy decreases, potential energy increases

(C) Both decrease

(D) Both increase ## Question 66 (A) Always increasing

(B) Always decreasing

(C) Conserved (stays constant)

(D) Equal only to kinetic energy ## Question 67 (A) It increases as heat is added

(B) It stays the same

(C) It decreases as some energy converts to heat

(D) Potential energy increases faster ## Question 68 (A) $3\text{ J}$

(B) $13.3\text{ J}$

(C) $30\text{ J}$

(D) $29.4\text{ J}$ ## Question 69 (A) At the highest point

(B) Halfway up

(C) At the moment of release / just before hitting the ground

(D) Midway on the way down ## Question 70 (A) When first thrown

(B) At the highest point in its arc

(C) Just before it hits the ground

(D) Halfway up ## Question 71 (A) Stored energy in chemical bonds

(B) Movement of electrons

(C) Vibration of waves through material

(D) Electromagnetic waves ## Question 72 (A) Chemical energy

(B) Kinetic energy

(C) Thermal (heat) energy

(D) Sound energy

{ "subject": "Natural Science", "question_type": "Multiple Choice", "knowledge_point": [ "Natural Science", "Physics", "Work, Energy, and Power" ] }

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Explanation:

Identify the scope of the worksheet

Solve Questions 50 to 56

Solve Questions 57 to 60

Answer:

Question 50

Question 51

Question 52

Question 53

Question 54

Question 55

Question 56

Question 57

Question 58

Question 59

Question 60

Question 61

Question 62

Question 63

Question 64

Question 65

Question 66

Question 67

Question 68

Question 69

Question 70

Question 71

Question 72