Answer:
Average Speed = (Total distance)/(Total Time) = (1800 + 1800)/(30 + 45) = 3600/75 = 48 km/hr. Hence the correct option here is C) 48 km/hr. So to find the average speed never use the formula of the averages but try to find the total distance covered and the total time taken.
Explanation:
It is equals to distance divided time
Answer:
The paper is placed on the focus of the lens then we get the sharp image.
Explanation:
Given that,
Object distance = 150000000 km
Diameter = 1400000 km
Diameter of lens = 5.2 cm
Focal length = 10 cm
We need to calculate the image distance
Using formula of lens



Here,


Hence, The paper is placed on the focus of the lens then we get the sharp image.
The SI prefix that means 1/100 is centi.
Explanation:
Use half life equation:
A = A₀ (½)^(t / T)
where A is the final amount,
A₀ is the initial amount,
t is time,
and T is half life.
0.375 = 3 (½)^(1 / T)
0.125 = (½)^(1 / T)
(½)^3 = (½)^(1 / T)
3 = 1 / T
T = 1/3 hours
T = 20 minutes
Explanation:
Here,
initial velocity(u)=25m/s
final velocity (v)=0m/s
time taken(t)= 5 second
Now,