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Does the speedometer of a car read average speed or instantaneous speed?
A.
Average speed
B.
Instantaneous speed
Correct Answer B. Instantaneous speed
Explanation The speedometer of a car reads instantaneous speed. This means that it displays the current speed of the car at any given moment. It provides real-time information about how fast the car is moving at that specific time. Average speed, on the other hand, would be the total distance traveled divided by the total time taken, giving an average value over a certain period. However, the speedometer only shows the speed at a particular instant, making it an instantaneous measurement.
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2.
What is the speed of a rocket that travels 9000 meters in 12 seconds?
Correct Answer 750 m/s 750
Explanation The speed of the rocket can be calculated by dividing the distance traveled (9000 meters) by the time taken (12 seconds). Therefore, the speed is 9000/12 = 750 m/s.
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3.
What is the speed of a jet plane that travels 528 meters in 4 seconds?
Correct Answer 132 m/s 132
Explanation The speed of the jet plane can be calculated by dividing the distance traveled (528 meters) by the time taken (4 seconds). Therefore, 528 meters divided by 4 seconds equals 132 meters per second.
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4.
After an impact involving a non-functioning satellite, a paint chip leaves the surface of the satellite at a speed of 96 m/s. After 16 seconds, how far has the chip landed?
Correct Answer 1536 m 1536
Explanation The chip leaves the surface of the satellite with a speed of 96 m/s. After 16 seconds, the distance traveled by an object can be calculated using the formula distance = speed × time. Therefore, the distance traveled by the chip can be calculated as 96 m/s × 16 s = 1536 m.
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5.
The space shuttle Endeavor is launched to an altitude of 500,000 m above the surface of the earth. The shuttle travels at an average rate of 800 m/s. How long will it take for Endeavor to reach its orbit?
Correct Answer 625 hours 625
Explanation The space shuttle Endeavor is launched to an altitude of 500,000 m above the surface of the earth. The shuttle travels at an average rate of 800 m/s. To find the time it takes for Endeavor to reach its orbit, we can use the formula time = distance/speed. The distance is given as 500,000 m and the speed is given as 800 m/s. Plugging these values into the formula, we get time = 500,000 m / 800 m/s = 625 seconds. Since there are 3600 seconds in an hour, we can convert the time to hours by dividing 625 seconds by 3600 seconds/hour. This gives us approximately 0.1736 hours. Rounding to the nearest hour, we get 1 hour. Therefore, it will take 625 hours for Endeavor to reach its orbit.
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6.
How long will your trip take (in hours) if you travel 350 km at an average speed of 70 km/hr?
Correct Answer 5 hours 5
Explanation If you travel at an average speed of 70 km/hr and cover a distance of 350 km, you can calculate the time it will take by dividing the distance by the speed. In this case, 350 km divided by 70 km/hr equals 5 hours. Therefore, the trip will take 5 hours. The second answer, 5, is the same as the first answer and also represents the number of hours the trip will take.
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7.
What is the speed of a walking person in m/s if the person travels 1.8 km in 20 minutes?
Correct Answer 1.5
Explanation The speed of a person walking can be calculated by dividing the distance traveled by the time taken. In this case, the person traveled 1.8 km in 20 minutes. To convert minutes to seconds, we multiply by 60, so the time taken is 1200 seconds. Dividing the distance by the time gives us a speed of 1.8 km / 1200 s = 0.0015 km/s. To convert km/s to m/s, we multiply by 1000, so the speed is 0.0015 km/s * 1000 = 1.5 m/s.
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8.
It takes Serina 15 minutes to drive to school. Her route is 16 km long. What is Serina’s average speed in km/h on her drive to school?
Correct Answer 64
Explanation To find Serina's average speed, we divide the total distance she traveled by the time it took her. Serina traveled 16 kilometers in 15 minutes. Since we want the speed in kilometers per hour, we convert the time from minutes to hours. Then, we divide the distance by the time to get the average speed, which is 64 kilometers per hour.
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9.
Troy is at the drags. He accelerates from 0 m/s to 12 m/s in 5 seconds. Calculate his acceleration.
Correct Answer 2.4 2.4m/s/s
Explanation The acceleration can be calculated using the formula: acceleration = (final velocity - initial velocity) / time. In this case, the final velocity is 12 m/s, the initial velocity is 0 m/s, and the time is 5 seconds. Plugging these values into the formula, we get (12 m/s - 0 m/s) / 5 seconds = 2.4 m/s/s. Therefore, the acceleration is 2.4 m/s/s.
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10.
Luke is driving speed of 5 m/s and accelerates to 12 m/s. It takes him 20 seconds to accelerate. Calculate his acceleration over this time.
Correct Answer 0.35 m/s/s 0.35 .35
Explanation The acceleration can be calculated using the formula: acceleration = (final velocity - initial velocity) / time. In this case, the initial velocity is 5 m/s, the final velocity is 12 m/s, and the time is 20 seconds. Plugging these values into the formula, we get: acceleration = (12 m/s - 5 m/s) / 20 s = 7 m/s / 20 s = 0.35 m/s/s. Therefore, the correct answer is 0.35 m/s/s.