A ship steams at a constant velocity of 30 km/h. (a) How far does it travel in a day? (b) How long does it take to travel 500 km?

College Physics
11th Edition
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Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Supplementary Problems
3.1.
A ship steams at a constant velocity of 30 km/h. (a) How far does it travel in a day? (b) How long does it take to travel
500 km?
A car moves at 50 km/h for h and then at 60 km/h for 2 h. (a) How far did it go? (b) What was its average velocity
for the entire trip?
32.
3.3. A woman jogs halfway home at 8 km/h and walks the rest of the way at 6 km/h. Find her average velocity for the
entire trip.
3.4. An airplane whose airspeed is 500 km/h covers a distance of 1000 km in 24 h. How strong was the headwind against
it?
3.5.
A boat moving downstream (with the current) in a river takes 4 min 7 s to cover a measured mile according to marks
on shore, and 7 min 30 s to cover the same distance moving upstream (against the current). If the boat's velocity
relative to the water is 11 mi/h, what is the velocity of the current in the river?
3.6. How long does it take an echo to return to a woman standing 300 m from a cliff? The velocity of sound in air is about
343 m/s.
3.7. A car moving at 100 km/h is 80 km behind another car moving at 60 km/h in the same direction. How far does the
first car travel before it overtakes the second car?
3.8. A pitcher takes 0.1 s to throw a baseball, which leaves his hand at a velocity of 30 m/s. What is the acceleration of
the baseball while it is being thrown?
3.9. A car comes to a stop in 6 s from a velocity of 30 m/s. (a) What is its acceleration? (b) At the same acceleration, how
long would it take the car to come to a stop from a velocity of 40 m/s?
3.10. The brakes of a car can slow it down from 60 to 40 km/h in 2 s. How long will it take to bring the car to a stop from
an initial velocity of 25 km/h at the same acceleration?
3.11. An object starts from rest with an acceleration of 10 m/s. (a) How far does it go in 0.5 s? (b) What is its velocity
after 0.5 s?
Transcribed Image Text:Supplementary Problems 3.1. A ship steams at a constant velocity of 30 km/h. (a) How far does it travel in a day? (b) How long does it take to travel 500 km? A car moves at 50 km/h for h and then at 60 km/h for 2 h. (a) How far did it go? (b) What was its average velocity for the entire trip? 32. 3.3. A woman jogs halfway home at 8 km/h and walks the rest of the way at 6 km/h. Find her average velocity for the entire trip. 3.4. An airplane whose airspeed is 500 km/h covers a distance of 1000 km in 24 h. How strong was the headwind against it? 3.5. A boat moving downstream (with the current) in a river takes 4 min 7 s to cover a measured mile according to marks on shore, and 7 min 30 s to cover the same distance moving upstream (against the current). If the boat's velocity relative to the water is 11 mi/h, what is the velocity of the current in the river? 3.6. How long does it take an echo to return to a woman standing 300 m from a cliff? The velocity of sound in air is about 343 m/s. 3.7. A car moving at 100 km/h is 80 km behind another car moving at 60 km/h in the same direction. How far does the first car travel before it overtakes the second car? 3.8. A pitcher takes 0.1 s to throw a baseball, which leaves his hand at a velocity of 30 m/s. What is the acceleration of the baseball while it is being thrown? 3.9. A car comes to a stop in 6 s from a velocity of 30 m/s. (a) What is its acceleration? (b) At the same acceleration, how long would it take the car to come to a stop from a velocity of 40 m/s? 3.10. The brakes of a car can slow it down from 60 to 40 km/h in 2 s. How long will it take to bring the car to a stop from an initial velocity of 25 km/h at the same acceleration? 3.11. An object starts from rest with an acceleration of 10 m/s. (a) How far does it go in 0.5 s? (b) What is its velocity after 0.5 s?
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