N1 Engineering Science|The Easy Way! 17
6. Fig. 1.8 shows the dimensions of a sports field. A man runs one and a half times around the perimeter of the field. If he started running from the half-way line (point A); 6.1 what was his displacement, and 6.2 how far did he run?
75 m
A (75 m; 585 m)
7. Fig. 1.9 shows the outline of a dam. Path A is the route taken by a power boat when it travelled straight from the one shore (x) to the next shore (y). A car leſt from x and travelled on land, following path B, to point y. 7.1 Was it the car or the boat that was displaced?
7.2 What was the displacement of 7.1? 7.3 How far did the car travel?
Fiig. 1.8g. 1.8
(y) •
Dam (x)• Fig. 1.9 Fig. 1.9 (Both were displaced; 780 m; 2,15 km) 8. Can distance covered and displacement be equal? Give a reason for your answer. Exercise 1.4
1. What is the difference between speed and velocity? 2. Is velocity a scalar or a vector quantity? Give a reason for your answer. 3. Is speed a scalar or a vector quantity? 4. Define velocity. 5. Write down the equation for calculating velocity.
6. A car travels for 25 minutes at a constant speed for 45 km. How fast is the car travelling?
7. A car travels at a constant speed of 110 km/h. How far will the car travel in 1,5 hours?
8. A man sees a puff of smoke from a cannon some distance away and 3,5 seconds later he hears a boom. If the velocity of sound is 355 m/s, how far is the cannon?
(108 km/h) (165 km) (1,243 km)
120 m
Route (B) 2,15 km
Path (A) 780 m
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