Practice: Beginning from a signpost, you run 60m to the right, then 60m back. The entire trip takes 24 seconds. What is your speed and velocity for the whole trip?

Subjects

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Vectors, Scalars, & Displacement | 14 mins | 0 completed | Learn |

Average Velocity | 33 mins | 0 completed | Learn |

Intro to Acceleration | 8 mins | 0 completed | Learn |

Position-Time Graphs & Velocity | 26 mins | 0 completed | Learn |

Conceptual Problems with Position-Time Graphs | 22 mins | 0 completed | Learn |

Velocity-Time Graphs & Acceleration | 6 mins | 0 completed | Learn |

Calculating Displacement from Velocity-Time Graphs | 15 mins | 0 completed | Learn |

Conceptual Problems with Velocity-Time Graphs | 11 mins | 0 completed | Learn |

Calculating Change in Velocity from Acceleration-Time Graphs | 11 mins | 0 completed | Learn |

Graphing Position, Velocity, and Acceleration Graphs | 11 mins | 0 completed | Learn |

Kinematics Equations | 53 mins | 0 completed | Learn |

Vertical Motion and Free Fall | 20 mins | 0 completed | Learn |

Catch/Overtake Problems | 23 mins | 0 completed | Learn |

Additional Practice |
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Motion Diagrams |

Proportional Reasoning |

Practice: Beginning from a signpost, you run 60m to the right, then 60m back. The entire trip takes 24 seconds. What is your speed and velocity for the whole trip?

Practice: You walk to the right at 3m/s for 8s, then turn around and walk backwards at 2m/s for some unknown time. You end up 16m to the right from where you started. How long did you walk backwards?

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Concept #1: Intro to Velocity and Speed

Practice #1: Calculating Speed and Velocity

Concept #2: Solving Constant and Average Velocity Problems

Example #1: Baseball Pitch

Concept #3: Constant Velocity with Multiple Parts

Practice #2: Constant Velocities in Different Directions

Example #2: Race Against Time

A ball is thrown against a wall and bounces back toward the thrower with the same speed as it had before hitting the wall. Does the velocity of the ball change in this process?
A) Although the speed is the same, the direction has changed. Therefore, the velocity has changed.
B) The velocity is the same because the speed is the same.
C) Without knowing the mass of the ball, the velocity is not determined.
D) The velocity is now twice as large because the ball is going into the opposite direction.

If you used only a keyboard to enter data, how many years would it take to fill up the hard drive in your computer that can store 83 (83109 ) of data? Assume "normal" eight-hour working days, and that one byte is required to store one keyboard character, and that you can type 180 characters per minute.

A certain audio compact disc (CD) contains 783.216 megabytes of digital information. Each byte consists of exactly 8 bits. When played, a CD player reads the CDs digital information at a constant rate of 1.4 megabits per second.How many minutes does it take the player to read the entire CD?

A maser is a laser-type device that produces electromagnetic waves
with frequencies in the microwave and radio-wave bands of the electromagnetic spectrum. You can use the radio waves generated by a hydrogen maser as a standard of frequency. The frequency of these waves is 1,420,405,751.786 hertz. (A hertz is another name for one cycle per second.) A clock controlled by a hydrogen maser is off by only 1 s
in 100,000 years. (The large number of significant figures given for the frequency simply illustrates the remarkable accuracy to which it has been measured.)What is the time for one cycle of the radio wave?How many cycles occur in
6 h ?How many cycles would have occurred during the age of the earth, which is estimated to be
4.6 109 years?By how many seconds would a hydrogen maser clock be off after a time interval equal to the age of the earth?

A certain fuel-efficient hybrid car gets gasoline mileage of 55.0 mpg (miles per gallon).You may want to review (Pages 6 - 7) .
For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of Converting volume units.If you are driving this car in Europe and want to compare its mileage with that of other European cars, express this mileage in km/L
(L =liter).If this cars gas tank holds 45 L
, how many tanks of gas will you use to drive 1600 km ?

One drop of oil falls straight down onto the road from the engine of a moving car every 5 s. Figure OQ2.1 shows the pattern of the drops left behind on the pavement. What is the average speed of the car over this section of its motion? (a) 20 m/s (b) 24 m/s (c) 30 m/s (d) 100 m/s (e) 120 m/s

According to a rule-of-thumb, every five seconds between a lightning flash and the following thunder gives the distance to the flash in miles.Assuming that the flash of light arrives in essentially no time at all, estimate the speed of sound in m/s from this rule.What would be the rule for kilometers?

A particle moves according to the equation x 5 10t 2 where x is in meters and t is in seconds. (a) Find the average velocity for the time interval from 2.00 s to 3.00 s. (b) Find the average velocity for the time interval from 2.00 to 2.10 s.

A fast-food restaurant uses a conveyor belt to send the burgers through a grilling machine.If the grilling machine is 1.3 m long and the burgers require 2.6 min to cook, how fast must the conveyor belt travel?If the burgers are spaced 15 cm apart, what is the rate of burger production (in burgers/min)?

In an experiment, a shearwater (a seabird) was taken from its nest, flown a distance 5160 km away, and released. It found its way back to its nest 13.1 days after release.If we place the origin in the nest and extend the +x-axis to the release point, what was the birds average velocity for the return flight?What was the birds average velocity in m/s for the whole episode, from leaving the nest to returning?

A rocket carrying a satellite is accelerating straight up from the earths surface. At 1.25 s after liftoff, the rocket clears the top of its launch platform, 61 m above the ground. After an additional 4.75 s , it is 1.30 km above the ground.Calculate the magnitude of the average velocity of the rocket for the 4.75 s part of its flight.Calculate the magnitude of the average velocity of the rocket the first 6.00 s of its flight.

If a baseball pitcher throws a fastball at a horizontal speed of 160km/h, how long does the ball take to reach home plate 18.4m away?

A rolling ball moves from x1 = 3.4 cm to x 2 = -4.2 cm during the time from t 1 = 3.0 s to t2 = 5.1 s. What is its average velocity?

A person takes a trip driving with a constant speed of 89.5 km/h except for a 22.0-min rest stop. If the person's average speed is 77.8 km/h (a) how much time is spent on the trip and (b) how far does the person travel?

Assume it takes 7.00 min to fill a 30.0-gal gasoline tank.(a) Calculate the rate at which the tank is filled in gallons per second.(b) Calculate the rate at which the tank is filled in cubic meters per second.(c) Determine the time interval, in hours, required to fill a 1.00-m 3 volume at the same rate. (1 U.S. gal = 231 in.3)

Starting from the front door of a ranch house, you walk 60.0 m due east to a windmill, turn around, and then slowly walk 40.0 m west to a bench, where you sit and watch the sunrise. It takes you 28.0 s to walk from the house to the windmill and then 36.0 s to walk from the windmill to the bench. For the entire trip from the front door to the bench, what are your (a) average velocity and (b) average speed?

Assume there are 100 million passenger cars in the United States and the average fuel efficiency is 20 mi/gal of gasoline. If the average distance traveled by each car is 10,000 mi/yr how much gasoline would be saved per year if the average fuel efficiency could be increased to 25 mi/gal?

If you are driving 130 km/h along a straight road and you look to the side for 2.5 s, how far do you travel during this inattentive period?

What is the velocity (in cm/s) of an object which moves 44 m in 2 s?

What is the average velocity (in kilometers per hour) of a cart that travels 100 km in 5 hours?

The planetary model of the atom pictures electrons orbiting the atomic nucleus much as planets orbit the Sun. In this model you can view hydrogen, the simplest atom, as having a single electron in a circular orbit 1.06×10−10 m in diameter. (a) If the average speed of the electron in this orbit is known to be 2.20×106 m/s, calculate the number of revolutions per second it makes about the nucleus. (b) What is the electron's average velocity?

1. The two measurements necessary for calculating average speed are A) distance and accelerationB) acceleration and timeC) velocity and distanceD) velocity and timeE) distance and time.

Part AHow much time does it take light to travel from the moon to the earth, a distance of 384,000 km?Part BLight from the star Sirius takes 8.61 years to reach the earth. What is the distance to Sirius in kilometers?

You can enter units that are combinations of units with prefixes. However, you must maintain the same unit system given in the problem. For example, this question uses the SI unit system. Therefore an answer in U.S. customary units, such as miles per hour would not be accepted as correct.A car traveling with constant speed travels 150 km in 7200 s. What is the speed of the car? Express the speed with the appropriate units.

In an 8.00km race, one runner runs at a steady 11.8 km/hr and another runs at 15.0 km/hr. How far from the finish line is the slower runner when the faster runner finishes the race?

Distances in space are often quoted in units of light years, the distance light travels in one year.How many meters is it to Andromeda, the nearest galaxy, given that it is 2.00 × 106 ly away? (ly is the standard symbol for light year)

Julie drives 100 mi to Grandmother's house. on the way to grandmothers h's Julie drives half the distance at 40 mph and half the distance at 60 mph. On her return trip, she drives half the time at 40 mph and half the time at 60 mph.What is Julie's average speed on the way to grandmother's house?

Julie drives 100 mi to Grandmother's house. on the way to grandmothers h's Julie drives half the distance at 40 mph and half the distance at 60 mph. On her return trip, she drives half the time at 40 mph and half the time at 60 mph.What is her average speed in the return trip?

Which of the following statements about average speed is correct?A. The average speed is equal to the magnitude of the average velocityB. The average speed can never be greater than the magnitude of the average velocityC. The average speed can never be less than the magnitude of the average velocityD. If the average speed is zero, then the average velocity must be zeroE. If the average velocity is zero, then the average speed must be zero

The motion sensor depends on which of the following for its operation?1. The emission of a short burst of sound waves.2. Doppler shift measurements of the reflected sound wave3. Measurement of the time between the burst and the detection of an echo.4. Calculation of a distance from the time and the speed of sound.5. Calculation of the velocity from the Doppler shift.A. 1, 3, 4B. 1, 2, 3, 5,C. 1, 2, 5D. 1, 2, 3, 4E. 1, 2, 3, 4, 5

In the year 1178. five monks at Canterbury Cathedral in England observed what appeared to be an asteroid colliding with the moon, causing a red glow in and around it. It is hypothesized that this event created the crater Giordano Bruno, which is right on the edge of the area we can usually see from Earth. How long after the asteroid hit the Moon, which is 3.84 x 105 km away, would the light first arrive on Earth in seconds?

An object moves 15 meters in 3 seconds. What is its velocity (in m/s)?

A particle is at x1 = 3.4 cm when t1 = −5.4 s and is at x2 = 8.0 cm when t2 = 5.6 s .(a) What is its average velocity?(b) Can you calculate its average speed from these data?

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