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Emily jogs 3 laps at the track to warm up. she jogs at 5mph. then she runs 3 more laps at 7 mph. what is true about her average speed and her average velocity?
Wiki User
∙ 12y ago
Her average speed is greater than her average velocity.
Wiki User
∙ 14y ago
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What does the slope of a line on a distance-versus-time graph show?
It shows the speed of an object in a direction towards or away from the reference point. This is not the speed of the object because any motion in a transverse direction is ignored. For example, even if a racing car is going at top speed around the reference point on a circular track, the distance v time graph will be a horizontal line. The slope will be zero.
Can you accelerate and keep the same speed?
Acceleration means any change in either speed or direction of motion.If speed remains constant, there may still be acceleration present if thedirection of the motion is changing.If the rate at which speed and/or direction are changing remains constant,then the acceleration is constant
Goldie Goldfish a speed swimmer loves to race around the parks pond which is 0.5 miles around If she can swim 20 laps around the track in 2 hours what is her average speed?
Goldie swims a total of 20*0.5 miles = 10 miles.She does so in 2 hours.Her average speed is therefore 10 miles per 2 hours.You can further simplify this by dividing both measures by 2.10 miles per 2 hours5 miles per 1 hour.She swam very fast: 5 mph.
What makes a race car fast?
The quick answer is low weight, powerful engine, and excellent cornering and braking ability. It's no use just being fast in a straight line, many of the fastest cars round a track are quick because of their ability to corner well. This can be achieved using aerodynamic aids to increase downforce (and thus grip), and sticky tyres. HAving good brakes also allows the driver to brake as late as possible into the bends, thus increasing the average speed around the track, and get good lap times.
A railroad diesel engine coasting at 10 Kmh runs into a stationary flatcar The diesel weighs four times as much as the flatcar. How fast do the cars move when they stick together upon collision?
There are no forces external to the engine and car involved here*, thus this is a case of conservation of momentum. Note, an unknown amount of energy is absorbed by the couplers and other parts of the engine and car, so the conservation of energy equation is not useful here. Momentum = velocity X mass Since momentum is conserved, the total velocity X mass before the collision will equal total velocity X mass after the collision. If we define the mass of the car as M, then the mass of the engine is 4M Let: the initial velocity of the engine = Ve1 = 10Kmh the initial velocity of the car = Vc1 = 0 Kmh the final velocity = V2 (it is the same for both the car and the engine) So the initial momentum is: (Ve1) (4M) + (Vc1) (M) = (10) (4M) + (0) (M) = 40M The final momentum is: (V2) (4M + M) = (V2) (5M) = 5V2M Setting the initial momentum equal to the final momentum gives: 40M = 5V2M Doing the algebra gives: 40 = 5V2 8 = V2 So, the answer is the final velocity is 8 Kmh *We are assuming friction of the wheels on the track is negligible and that the track is level so that gravity can be ignored.
Emily jogs three laps around the track to warm up she jogs at 5 mph then she runs three more laps at 7 miles per what is true about her average speed and her average velocity?
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What is the answer to this question Emily rides a bicycle around a circle track Abby rides on a straight track Emily contains a steady speed but Abby's speed increases describe the acceleration e?
Abby is on a straight track, with increasing speed. Her acceleration is the rate of change of speed. Not sure of the significance of Emily in this question.
What is one example of velocity?
One example of Velocity is that if you are running in the same direction, your speed and velocity is the same. But if you are running AROUND the track, your speed is the same but your velocity is changing.
When you run around a track at 5 km h your velocity is constant?
No. Your speed is constant but your velocity is not. Velocity is a vector and as you run around a track, the direction of your motion changes and so the velocity changes - not in magnitude but in direction.
Is constant speed current velocity?
No, it is not. Basically speed is a scalar whereas velocity is a vector.A car going round a circular track at constant speed has a velocity which is changing at every moment.
Explain why velocity changes while driving around a circular track even if the speed is constant?
Velocity consists of a speed and a direction. If any of the two changes, the velocity changes.
When you are describing the rate that a race car goes around a track should you use the term speed or velocity to describe the motion?
Since velocity is speed with direction, you would use speed in reference to average rate of change of position, since the direction keeps changing. You can use velocity in reference to instantaneous speed, since a car is going in a specific direction at each instant in time.Examples:80 km/h is a speed.80 km/h due north is a velocity.
Is velocity an objects speed and direction of motion?
Velocity is an objects speed in a given direction e.g. a runner having run round a circular track of 400m in circumference has 0 velocity.
Is a car on a circular track has also constant velocity?
Yes, IF it maintains constant speed on the track. The academic definition of velocity is speed and the associated direction, a vector. A car traveling in a circle is constantly changing direction. However, most people, including physicists when they are not writing textbooks, treat velocity and speed as interchangable such that a car going a constant speed on a circular track would be considered to have a constant velocity even though the direction in which it is traveling is constantly changing.
A car runs at a constant speed on a circular track of radius 200 meters taking 62.8 seconds on each lapfind the average velocity and average speed on each lap?
Avg speed =dis/time=2(pi)*100/62.8=10m/s Avg velocity will be 0 since the car ends up back from where it is started ..
Mike ran ten laps around his schools 14 mile track in 15 minutes. What was his average velocity in miles per hour?
His velocity was zero - since he's back to where he started. (Try to substitute speed where appropriate.)
When Mike ran ten laps around his school's 14 mile track in 15 minutes. what was his average velocity in miles per hour?
His velocity was zero - since he's back to where he started. (Try to substitute speed where appropriate.)
