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6. Which statement is true about the moon? a. It is kept in its orbit by the gravity of Earth. b. It has a velocity parallel to the radius vector C. It has a velocity of 9.8 m/s. It was not considered as a falling body by Sir Isaac Newton. What is space junk? a. It is debris from artificial objects orbiting Earth. b. It refers specifically to discarded rocket boosters that did not return to Earth. It consists both of wanted objects such as GPS satellites and unwanted objects such as discarded rocket boosters. It refers to satellites that will never return to Earth. 8. Which of the following statements is true about general relativity? It explains gravity in terms of forces. It is a theory that was developed by Sir Isaac Newton. It was shown to be incorrect by Albert Einstein. It explains gravity in terms of the geometry of space and time. 9. Which statement is true? All protons carry the same amount of negative charge. Like charges repel and unlike charges attract. All electrons carry the same amount of positive charge. All of these. 10. What is true concerning the total charge of a closed system? remains constant always neutral C. always positive always negative 11. A charged balloon is held near a stream of water flowing from a faucet. It attracts the water. Why is the water attracted? a. The charge on the balloon transfers to the water molecules causing attraction. b. The water molecules are charged. C. The water molecules break into hydrogen and oxygen atorwhen in the presence of a charged object. The object induces a charge s the water. ultiple masses, such as a solar system.Two identical electric charges qi and qz are separated by a distance /. If r is tripled, what happens to the electric force between them? triples decreases by a factor of 3 decreases by a factor of 9 increases by a factor of 9 3. Which statement is true about the electric field at a point in space? a. It points in the same direction as the force on a small positive test charge b. It points in the same direction as the force on a small negative test charge. It points opposite to the direction of the force on a small positive test charge. It is not related to the force on a test charge. 14. Which statement correctly describes the density of electric field lines? a. The density increases with separation from a point charge. b. The density is proportional to the magnitude of the electric force The density decreases with distance from a point charge. The density decreases when approaching a negative point charge 15. What entity emits the light seen in the aurora borealis? .atoms of nitrogen and oxygen in Earth's atmosphere charged particles from the sun the magnetic field lines of Earth Sunspots 16. What effect does a magnetic field have on the motion of a charged particle? The particle is unaffected by a magnetic field. The particle must move in a circle. The particle spirals around the magnetic field lines. The particle spirals around the magnetic field lines only if it has a negative charge. Which statement is true? The magnetic poles of Earth have fixed positions. The magnetic poles of Earth have reversed direction many lathes. The magnetic field of Earth is due to its solid iron core. The cause of Earth's magnetic field is completely understood.18. An electron is over the equator 100 m above the surface of Earth. It is at rest with respect to the magnetic field lines of Earth. What is true about the force on the electron due to the magnetic field of Earth? The force points to the east. The force points toward the west. The force points upward from the surface of Earth. The force equals O N. 19. An alpha particle has a charge of 2e. A proton moves through a magnetic field with a velocity v. The alpha particle moves through the same field in the same direction, and feels the same magnetic force. What is the velocity of the alpha particle? a. 2V b. C. 0.5V 0.25 V 20. Which statement about field theory is true? a. Field theory is a scientific model. b. Field theory describes forces in terms of entities called fields that exist at every point in space. c. Field theory applies to gravitation, electric and magnetic forces. All of these. are multiple masses, such as a solar system.B: True/False - read each statement carefully. Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true. (1 mark each) 1. It is not possible for a planet with a radius less than that of Earth to have a surface gravity greater than g. 2. The orbital period of a geosynchronous satellite is 24 hours. B. Einstein developed many of his theories based on experiments done in a laboratory. 4. Objects that have more negative charge than positive charge are negatively charged. 5. According to Coulomb's law, the electric force between two point charges is directly proportional to the product of the charges. 6. Electric field lines are continuous lines of energy that show the direction of electric force at all points in the electric field around a charge or charges. _ 7. Opposite magnetic poles attract one another, and like magnetic poles repel one another. Moving electric charges produce a magnetic field. 9 . Consider a solenoid. If you place the fingers of your right hand to curl opposite to the direction of the conventional current, your thumb points in the direction of the magnetic field lines in the centre of the coil. 10. If the angle between the direction of the velocity of a charged particle and the direction of a magnetic field is 90% the magnetic force on the particle is zero. exist only where there are multiple masses, such as a solar system.PHYSICS 30 UNIT EXAM FOUR(1 X New Tab X + 64701077/PHYSICS-30-UNIT-EXAM-FO_pdf/ C: Calculation Questions - show all of your work What is the mass of a planet if when it is a distance of 2.90 x 10"? m from the center of the sun the force of attraction is 1.38 x 1021 N? (2 marks) 2. A 8.00 x 10' kg satellite is orbiting 625 km above the earth. (4 marks) a. Determine the acceleration due to gravity experienced by the satellite b. Determine the distance above the earth that a satellite of the same mass will orbit if it experiences only half the acceleration of the satellite in part a. 3. A silver Nissan 370Z Roadster with a mass of 1375 kg has a speed of 30.0 m/s when it travels through a 90.0' corner (quarter of a circle) with a radius of 45.0 m. (6 marks) a. How long does it take the Roadster to negotiate the curve? b. What is the centripetal acceleration of the Roadster? What is the minimum friction force required for the Roadster to negotiate the curve without skidding? pg. 6 ey exist only where there are multiple masses, such as a solar system.+ le/64701077/PHYSICS-30-UNIT-EX/ OUR1pdf/ Refer to the electrostatic series. An acetate rod is rubbed with cotton. Describe the charge transfer that occurs. (2 marks) weak hold on acetate electrons glass wool cat fur, human hair calcium, lead silk increasing aluminum tendency cotton to gain paraffin wax electrons ebonite polyethylene (plastic) carbon, copper, nickel sulfur platinum, gold strong hold on electrons Refer to the series of three diagrams. Explain the type of charging taking place, and why it works. (2 marks) charged rod ground A red balloon is given a charge of -30.0 HC and placed near a green balloon with a change of -70.0 HC, such 6 that their centres are separated by 1.25 m. What is the magnitude of the electric force exerted by the red balloon on the green balloon? (2 marks) y exist only where there are multiple masses, such as a solar system.Two charges , = -25 C and