Question

13) What is SONAR?
14) Define average speed.
15) A bus travels a distance of 120 km with a speed of 40 km/h and returns with a speed of 30
km/h. Calculate the average speed for the entire journey.
16 What does the odometer of an automobile measure? Which of the following is moving faster?
Justify your answer.
(i) A scooter moving with a speed of 300 m per minute.
(ii) A car moving with a speed of 36 km per hour.
17) A bus accelerates uniformly from 54 km/h to 72 km/h in 10 seconds Calculate
(i) acceleration in m/s?
(ii) distance covered by the bus in metres during this interval.
18) A car moves with a speed of 30 km/h ‘for half an hour, 25 km/h for one hour and 40 km/h
for two hours. Calculate the average speed of the car.
19) A certain household has consumed 250 units of energy during a month How much energy is this in joules?​

Answer 1

Step-by-step explanation:

A certain household has consumed 250 units of energy during a month. How much energy is this in joules? 1 unit of energy is equal to 1 kilowatt hour (kWh). Therefore, 250 units of energy = 250 — 3.6 — 106 = 9 — 108