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finale exam 11,12,13
finale exam
| Question | Answer |
|---|---|
| Ch11: A river current has a velocity of 5 km/h relative to the shore, and a boat moves in the same direction as the current and 5km/h relative to the river. How can the velocity of the boat relative to the shore be calculated | By adding the vectors |
| Ch11: One kilometer equals 1000 meters. what does the prefix kilo men | 1000 |
| Ch 11: Displacement vectors of 1 km south, 3 km north, 6 km south, and 2 km north combine to a displacement of | 2km |
| Ch 11: A person walks 1 mile every day for exercise, leaving her front porch at 9:00 AM and returning to her front porch at 9:25 AM what is the total displacement of her daily walk | 0 |
| Ch 11: A ball is rolled uphill a distance of 3 meters before it slows, stops, and begins to roll back. The ball rolls downhill 6 meters before coming to rest against a tree. what is the magnitude of the ball's displacement | 3 meters |
| Ch 11: A car traveled 88 km in 1 hour, 90 km in the next 2 hours, and then 76 km in 1 hour before reaching its destination. what was the car's average speed. | 88+90+76=254/4 63.5 km/h |
| Ch 11:The slope of a like on a distance-time graph is | Speed |
| Ch 11: What is the most appropriate SI unit to express the speed of a cyclist in the last leg of a 10-km race | km/h |
| Ch 11: The slope of a speed-time graph indicates | Acceleration |
| Ch 11: Instantaneous speed is measured | At a particular instant |
| Ch 11: A speed-time graph shows that a car moves at 10m/s for 10s. the car's speed then steadily decreases until it comes to a stop at 30s. which of the following describes the slope of the speed-time graph form 10s to 30s | Linear, sloping downward |
| Ch 11: A person drives north 3 blocks, then turns east and drives 3 blocks. The driver then turns south and drives 3 blocks. How could the driver have made the distance shorter wile maintaining the same displacement | By driving 3 blocks form the starting point |
| Ch 11: Objects in free fall near the surface of the earth experience | Constant acceleration |
| Ch 11: What is instantaneous speed | How fast a velocity is changing at a specific instant |
| Ch:11 An object moving at 10 m/s takes 5s to come to a stop. What is the objects acceleration | -6m/s^2 |
| Ch 11: which example identifies a change in motion that produces acceleration | A Ball moving at a constant speed around a circular track |
| Ch 11: Which example describes constant acceleration due ONLY to change in direction | Traveling around a circular track |
| Ch 11: An object that is accelerating may be | gaining speed, slowing down, and changing direction |
| Ch 11: Speed is the ratio of the distance an object moves to | The amount of time needed to travel the distance |
| Ch 11: A distance -time graph indicates that an object moves 100 m in 4 s and then remains at rest for 1s. what is the average speed of the object | 100/5 = 20m/s |
| Ch 12: The SI unit of force is the | Newton |
| Ch 12: An open parachute increasing air resistance of a falling sky diver by | Increasing surface area |
| Ch 12: The product of an object's mass and velocity is its | Momentum |
| Ch 12: The centripetal force acting on a satellite in orbit | Acts as an unbalanced force on the satellite, is a center-directed force, and changes the direction of the satellite |
| Ch 12: Projectile motion is caused by | The downward force of gravity and an initial forward velocity |
| Ch 12: Examples of action and reaction forces | When a tennis racket strikes a tennis ball, When rowing a boat, and when stepping from a curb |
| Ch 12: Which universal force acts only on the protons and neutrons in nucleus | Strong Nuclear |
| Ch 12: When a pair of balanced forces acts on an object, the net force that results is | Equal to Zero |
| Ch 12: What force is responsible for the repulsion between two positively-charged particles | Electric |
| Ch 12: When opposite poles of two magnets are brought together, the poles | Attract each other |
| Ch 12: The property of matter that resists change in motion is called | Inertia |
| Ch 12: Example of a weak nuclear force | Nuclear decay |
| Ch 12: What is momentum of a 10-kilogram ice skater gliding across the ice at a speed of 2 m/s | 100m/s |
| Ch 12: What kind of friction occurs as a fish swims through water | Fluid |
| Ch 12: The gravitational force between two objects increases as mass | Increases or distance decreases |
| Ch 12: What universal force is the most effective over long distances | Gravitational |
| Ch 12: As you push a cereal box across a table top, the sliding friction acting on the cereal box | Acts in the direction opposite of motion |
| Ch 12: Newton's third law of motion describes | Action and reaction forces |
| Ch 12: When an unbalanced force acts on an object | The object accelerates |
| Ch 12: The acceleration due to gravity on the surface of Mars is about one-third the acceleration due to gravity on earths surface. the weight of a space probe on the surface of Mars is about | one-third its weight on earths surface |
| Ch 13: The pressure of air at sea level is approximately | 101 kPa |
| Ch 13: What will sink in water (density of water 1.00 g/cm^3 | Anything More that the density |
| Ch 13: Were is fluid pressure the greatest | 2 meters below the surface of a swimming pool |
| Ch 13: The upward force acing on an object submerged in a fluid is called | Buoyant force |
| Ch 13: If teh air inside a balloon exerts a force of 1N on an area of 0.5 m^2, what is the pressure inside the balloon | 2N/m^2 |
| Ch 13: An example of a NON-fluid | Cork |
| Ch 13: Which of the following statements is true about an airplane wing during flight | Air moves above the wing travels faster than the air below the wing |
| Ch 13: Which of the following states Bernoulli's principle | As the speed of a fluid increases, the pressure within the fluid decreases |
| Ch 13: The operation of hydraulic lift system is explain by | Pascal's principle |
| Ch 13: Which principle states that change in the pressure at any point in a fluid in a closed container is transmitted equally and unchanged in all directions thought the fluid | Pascale's |
| Ch 13:Piston 1 exerts a pressure of 10 Pa on the fluid in the hydraulic sl lift. what is the fluid pressure on piston 2 | 10 Pa |
| Ch 13: The relationship between buoyant force and weight of a displaced fluid was first stated by | Archimedes |
| Ch 13: Two identical corks float in separate beakers. one beaker contains water the other contains very salty water what would happen to the corks | Both corks are subjected to the same buoyant force |
| Ch 13: Atmospheric pressure is caused by | The weight of the atmosphere above a particular location |
| Ch 13: The buoyant force on an object in a fluid is equal to the weight of the | Fluid displaced by the object |
| Ch 13: In order to calculate pressure exerted on a surface , what quantity is divided by the surface area | Force |
| Ch 13: A brick weighs 21 N. Measured underwater, it weighs 12 N. what is the size of the buoyant force exerted by the water on the brick | 9N |
| Ch 13: What is not possible to do with water | compress 2 liters of water into 1 liter volume |
| Ch 13: what will float in corn syrup (1.38 g/cm^3 | anything less than the dencity |
| Ch 13: hydraulic in a dump truck multiplies | Force |
Created by:
26sprim