Me
question 1 (1 point)
when reporting the speed, we need to include the value, un...
Me
question 1 (1 point)
when reporting the speed, we need to include the value, units and direction the object was traveling.
true
false
question 2 (1 point)
when reporting the velocity of an object, we need to include the value, the units and the direction the object was traveling.
true
false
question 3 (1 point)
an object travels 10 meters to the right and 7 meters to the left, what distance has it traveled?
17
17 meters
3
3 meters
question 4 (1 point)
an object travels 5 meters to the north and 7 meters south, what was its total displacement?
2 meters
2 meters south
12 meters
12 meters north
question 5 (1 point)
an object travels 10 meters to the right before reversing direction and going 13 meters to the left. jenny reported its displacement as 3 meters, but she was not correct. what did she do wrong?
she reported the distance instead of the displacement.
she forgot to include the units.
she did not give the direction as either left, or negative.
she did not do anything wrong.
question 6 (1 point)
a car travels 5 miles north and then 2 miles south in 1/4 hour. what was its average speed?
7 mph
3 mph
28 mph
14 mph
question 7 (1 point)
a car travels 5 miles north and then 2 miles south in 1/4 hour. what was its average velocity?
28 mph
12 mph
12 mph south
12 mph north
question 8 (1 point)
mya is running an experiment to determine if a car with large tires will move faster than a car with small tires. her ramp is 0.75 meters long. she recording the following times on each of her trials: trial 1: 2.5 seconds, trial 2: 2.75 seconds, trial 3: 2.98 seconds. what was the average speed of her car?
2.74 m/s
3.7 m/s
0.27 m/s
2.7
question 9 (1 point)
data that is accurate, is data that is really close to the actual value, but data that is precise is data that is repeated over and over again.
true
false
question 10 (1 point)
accuracy and precision mean the same thing.
true
false
Answers: 3
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Answers: 2
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Answers: 2
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A75-hp (shaft output) motor that has an efficiency of 91.0 percent is worn out and is to be replaced by a high-efficiency motor that has an efficiency of 95.4 percent. the motor operates 4368 hours a year at a load factor of 0.75. taking the cost of electricity to be $0.12/kwh, determine the amount of energy and money saved as a result of installing the high-efficiency motor instead of the standard motor. also, determine the simple payback period if the pu
Answers: 1
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