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What is instantaneous speed is measured ...?
Points scored may differ from the grading guidelines because of teacher review. Contact your program teacher if you have any questions.Correct Partial Credit IncorrectMultiple ChoiceIdentify the letter of the choice that best completes the statement or answers the question.1.Which distance can be most accurately measured with a ruler?(1 point)(0 pts) the length of a river(1 pt) the width of a book(0 pts) the distance between two cities(0 pts) the size of an object under a microscope1 /1 point 2.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 while maintaining the same displacement?(1 point)(1 pt) by driving east 3 blocks from the starting point.(0 pts) by driving north 1 block and east 4 blocks.(0 pts) by driving west 3 blocks from the starting point.(0 pts) by driving back to the starting point by the same route.1 /1 point 3.Displacement vectors of 1 km south, 3 km north, 6 km south, and 2 km north combine to a total displacement of(1 point)(0 pts) 12 km(0 pts) 6 km(0 pts) 4 km(1 pt) 2 km1 /1 point 4.Instantaneous speed is measured(1 point)(0 pts) at the starting point.(0 pts) when the object reaches its destination.(1 pt) at a particular instant.(0 pts) over the duration of the trip.0 /1 point 5.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?(1 point)(0 pts) 254 km/h(1 pt) 63.5 km/h(0 pts) 209 km/h(0 pts) 74.5 km/h1 /1 point 6.A horizontal line on a distance-time graph means the object is(1 point)(0 pts) moving at a constant speed.(0 pts) moving faster.(0 pts) slowing down.(1 pt) at rest.1 /1 point 7.A distance-time graph indicates that an object moves 100 m in 4 s and then remains at rest for 1 s. What is the average speed of the object?(1 point)(0 pts) 50 m/s(0 pts) 25 m/s(1 pt) 20 m/s(0 pts) 100 m/s1 /1 point 8.What example identifies a change in motion that produces acceleration?(1 point)(0 pts) a speed skater moving at a constant speed on a straight track(1 pt) a ball moving at a constant speed around a circular track(0 pts) a particle moving in a vacuum at constant velocity(0 pts) a vehicle moving down the street at a steady speed1 /1 point 9.Objects in free fall near the surface of the Earth experience(1 point)(0 pts) constant speed.(0 pts) constant velocity.(1 pt) constant acceleration.(0 pts) constant distance.1 /1 point 10.The slope of a speed-time graph indicates(1 point)(0 pts) direction.(1 pt) acceleration.(0 pts) velocity.(0 pts) speed.1 /1 point CompletionComplete each sentence or statement.11.The motion of an object looks different to observers in different _____________.(1 point)(1 pt) frames of reference(1 pt) perspectives(1 pt) speed(1 pt) frames of references(1 pt) frame of references(1 pt) frame(0 pts) perspective0 /1 point12.The direction and length of a straight line from the starting point to the ending point of an object's motion is _____________.(1 point)(1 pt) displacement1 /1 point13.The difference between speed and velocity is that velocity indicates the _____________ of motion and speed does not.(1 point)(1 pt) direction1 /1 pointShort Answer14.Bus A travels 300 m in 12 s. Bus B travels 200 m in 12 s. Both vehicles travel at constant speed. How do the distance-time graphs for these two speeds differ?(3 points)Essay:bus A was going 25m/s bus B was going 16m/s1 /3 points15.What is the significance of the slope in a distance-time graph? (3 points)Essay:to show acceleration3 /3 points16.What types of changes in motion cause acceleration?(3 points)Essay:change in position3 /3 pointsProblem17.If you ride your bike at an average speed of 2 km/h and need to travel a total distance of 20 km, how long will it take you to reach your destination? Show your work.(3 points)Essay:20 / 2 = 10h3 /3 pointsEssay18.Picture a ball traveling at a constant speed around the inside of a circular structure. Is the ball accelerating? Explain your answer.(5 points)Essay:no because its going a constant speed5 /5 pointsOther19.Calculating Using vector addition, calculate the distance traveled by the object and the displacement of the object represented by the figure.(5 points)Essay:a displacment is 11 meters, B displacement is 5 meters distance traveled is the same5 /5 pointsThe final score is 31/35 (88.6%).
The formula for calculating kinetic energy can be written as?
In Newtonian mechanics the formula is: E = 1/2 m v^2 Where E is the kinetic energy, m the mass of an object and v its velocity. If the speed approaches that of light a different formula should be used according to special relativity: E = (gamma - 1) m c^2 Here c is the speed of light and gamma is the gamma factor given by: 1 / sqrt(1-sqr(v/c)).
You cover 10 meters in a time of 1 second. Is your speed the same if you cover 20 meters in 2 seconds?
Yes, the speed is the same in both scenarios. Speed is calculated as distance divided by time, so if you cover 10 meters in 1 second or 20 meters in 2 seconds, the speed remains constant at 10 meters per second.
What is mach speed?
340.29 m/s
What happened to kinetic energy is speed is halved?
The formula for kinetic energy is: KE = mv^2, in which m is mass in kilograms and v is speed in meters/second, or m/s. The unit for kinetic energy is the Joule (J), which is one kilogram·m^2/s^2. If the speed of a mass is halved, it's kinetic energy will be reduced by one quarter. For example, if a 1 kg mass has a speed of 4 m/s, its kinetic energy = 1 kg(4 m/s)^2 = 16 J. If the speed of the 1 kg mass is halved to 2 m/s, its new kinetic energy = 1 kg(2 m/s)^2 = 4 J.
How does the average speed of light glass compare with its speed in a vacuum?
About 2/3 its speed in a vacuum.
How do you compare kinetic energies on things that move?
Kinetic energy = (1/2)*mass*(speed)^2 where, in metric units, mass is in kilograms, speed is in meters/second, and kinetic energy is in Joules. So, you need to know the mass and the speed of the things.
What are the steps in a compare and contrast?
1. Compare 2. Contrast
Standard unit for the speed of light?
The speed of anything is(the distance from point-1 to point-2) / (the time it takes that thing to travel from point-1 to point-2)Consequently, we may write, without fear of confrontation or contradiction,that the speed of light is(the distance from point-1 to point-2) / (the time it takes light to travel from point-1 to point-2)Moreover, after literally centuries of observation and experimentation, by giantsupon whose shoulders we now stand, we are able to write that speed. If thereis no material substance between point-1 and point-2, then the speed is299,792,458 meters (186,282 miles) per second.If there IS material substance in that space then the speed is somewhat less,and varies depending on the substance.It is never more.
The distance and direction of an object from a starting point?
The distance formula is Example: (1,1) and (3,2) X1=1 X2=3 Y1=1 Y2=2 (3-1)2=4 and (2-1)2=1 4+1=5 The answer is going to be the square root of 5
How many ev point does staravia have?
2 Speed
What one has the greatest kinetic energy a semi truckmotorcyclecarbicycle?
if all moving at same speed the semi truck has greatest, since it is heavier and kinetic energy is 1/2 mass x velocity squared
What is the kinetic energy of an object that has a mass of 20 kg and a speed of 2 point 8 m per s?
Kinetic Energy = 1/2 m V2 = 1/2 (20) (2.8)2 = 78.4 joules
What is quadrant does the point (-2-1) lie?
-1
Is .2 less than .15?
Compare the first digit after the decimal point. Which is less?
How does 7 3rds compare to 2 1 3rds?
7/3 = 2 and 1/3
Plot the following points point 1 10 point 21-1 point 3 1-2 point 4 2 -2 draw lines to connect from point 1 to point 2 to point 3 to point 4 the lines that you have just drawn most resembled which of?
It's the shape of the letter L
