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What is the most appropriate SI unit to express the speed of a cyclist in the last leg of a 10-km race? A. km/s B. km/h C. mm/s D. cm/h
Weegy: The answer is B. km/h User: A ball is rolled uphill a distance of 5 meters before it slows, stops, and begins to roll back. The ball rolls downhill 9 meters before coming to rest against a tree. What is the magnitude of the ball’s displacement? A. 4 meters B. 9 meters C. 14 meters D. 45 meters Weegy: A. 4 meters .The ball only moved 4 mts away from initial position, regardless of the 9 meter travel. User: Suppose you increase your walking speed from 1 m/s to 3 m/s in a period of 1 s. What is your acceleration? A. 2 m/s2 B. 5 m/s2 C. 4 m/s2 D. 3 m/s2 Weegy: A. 2 m/s2 User: An object that is accelerating may be A. slowing down. B. gaining speed. C. changing direction. D. all of the above Weegy: D. all of the above User: Which of the following statements is true? A. An object that is accelerating is always changing direction. B. An object has an instantaneous acceleration, even if the acceleration vector is zero. C. An object at rest has an instantaneous acceleration of zero. D. Instantaneous acceleration is always changing. Weegy: C. An object at rest has an instantaneous acceleration of zero. User: The rate at which velocity changes is called A. speed. B. vectors. C. acceleration. D. motion. Weegy: The rate at which velocity changes is called acceleration. (More)
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Asked 3/29/2013 9:30:45 AM
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A speed-time graph shows that a car moves at 10 m/s for 10 s. The car’s speed then steadily decreases until it comes to a stop at 30 s. Which of the following describes the slope of the speed-time graph from 10 s to 30 s? A. linear, horizontal B. curved, upward C. linear, sloping downward D. linear, sloping upward
Weegy: C. linear, sloping downward User: What is instantaneous acceleration? A. how fast a speed is changing at a specific instant B. how fast a velocity is changing at a specific instant C. how fast a direction is changing at a specific instant D. all of the above Weegy: B. how fast a velocity is changing at a specific instant User: 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 at 5 km/h relative to the river. How can the velocity of the boat relative to the shore be calculated? A. by subtracting the river current vector from the boat’s velocity vector B. by dividing the river current vector by the boat’s velocity vector C. by multiplying the vectors D. by adding the vectors Weegy: D. by adding the vectors User: Which example describes constant acceleration due ONLY to a change in direction? A. increasing speed while traveling around a curve B. an object at rest C. traveling around a circular track D. an object in free fall Weegy: B. An object at rest has an instantaneous acceleration of zero. (More)
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Asked 3/29/2013 9:34:02 AM
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Which example identifies a change in motion that produces acceleration? A. a speed skater moving at a constant speed on a straight track B. a ball moving at a constant speed around a circular track C. a particle moving in a vacuum at constant velocity D. a vehicle moving down the street at a steady speed
Weegy: B. a ball moving at a constant speed around a circular track is an example identifies a change in motion that produces acceleration. User: One kilometer equals 1000 meters. What does the prefix kilo- mean? A. 1 B. 10 C. 100 D. 1000 Weegy: D. 1000 User: An orange might roll off your cafeteria tray when you stop suddenly because of A. the balanced forces acting on the orange. B. the centripetal force acting on the orange. C. the friction forces acting on the orange. D. the orange’s inertia. Weegy: An orange might roll off your cafeteria tray when you stop suddenly because of the orange's inertia. User: What is the momentum of a 50-kilogram ice skater gliding across the ice at a speed of 5 m/s? A. 10 B. 500 kg•m/s C. 50 kg D. 250 kg•m/s Weegy: D. 250 kg?m/s User: The SI unit of force is the A. joule. B. kilogram. C. meter. D. newton. Weegy: The SI unit of force is the D. newton. User: The product of an object’s mass and velocity is its A. centripetal force. B. momentum. C. net force. D. weight. Weegy: B. momentum. Momentum is the product of an object's velocity and its mass. momentum = mass x velocity or p = mv User: The acceleration due to gravity on the surface of Mars is about one third the acceleration due to gravity on Earth’s surface. The weight of a space probe on the surface of Mars is about A. nine times greater than its weight on Earth’s surface. B. three times greater than its weight on Earth’s surface. C. one third its weight on Earth’s surface. D. the same as its weight on Earth’s surface. Weegy: C. one third its weight on Earth???s surface. User: The forces acting on a falling leaf are A. air resistance and fluid friction. B. gravity and air resistance. C. gravity and static friction. D. weight and rolling friction. Weegy: The forces acting on a falling leaf are : B. gravity and ... (More)
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Asked 3/29/2013 9:39:16 AM
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The gravitational force between two objects increases as mass A. decreases or distance decreases. B. decreases or distance increases. C. increases or distance decreases. D. increases or distance increases.
Weegy: C. increases or distance decreases. User: Newton’s third law of motion describes A. action and reaction forces. B. balanced forces. C. centripetal forces. D. net force. User: Your weight equals your A. mass. B. mass divided by the net force acting on you. C. mass times the acceleration due to gravity. D. mass times your speed. Weegy: Your weight equals your B. mass divided by the net force acting on you. [ ] User: What kind of friction occurs as a fish swims through water? A. fluid B. rolling C. sliding D. static Weegy: What kind of friction occurs as a fish swims through water? C. Sliding. (More)
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Asked 3/29/2013 10:07:19 AM
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Weegy: The first human invention to break the sound barrier is a whip or [ bullwhip. ]
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