Question

(d) Calculate the time taken by an aircraft to cover a distance of 1400km with an avera
velocity of 800km/hr.
Ans.
(e) What is the time period of a pendulum which is oscillating (a) 10 times in one second?
(b) 30 times in four seconds?
s. (i).
(ii)
a diagram​

Answer 1

Answer:

1. Data: Time=?, Distance=1400km =1400000m, Velocity=800km/hr=800000m/3600s=222m/s

Solution: Velocity = Distance / Time

Time = Distance/Velocity = 1400000/222=6306.

2. Time period = Time taken /Number of oscillations = 1/10 = 0.1 sec.

Time period = Time taken/ Number of oscillations= 4/30 =0.13 sec.

Answer 2

Answer:

your answer is in attachment