S^2=3^2+4^2
S^2=9+16
S^2=25
S=√25
S=5m
Answer:
B
Explanation:
Torque exerted on an object depends upon three things.
1. Moment arm
2. Magnitude of applied force
3. Direction of force
T=r x F
T= r * F sinФ
Let T1 is force due to force applied at mid point of door.
let d is the width of door, so
T1= °) (∴ moment arm =d)
T1= __________(2) (∴ sin 90°=1)
Let T2 is the torque due to force applied at the doorknob.
T2= (∴ moment arm =d)
T2= __________(2) (∴ sin 90°=1)
From equation (1) and equation (2)
2T1=T2
or
T1= T2/2
As T2 is greater so option B is the correct answer.
as per the question charlie runs to the store which is 4 km away
hence the total distance covered [S] is 4 km
he takes 30 minutes to reach the store.
hence the total time taken [t] = 30 minutes=0.5 hour
We have to calculate the average speed.
the average speed[v]=
=
=8 km/hour
then we have to calculate the total distance traveled by charlie in 1 hour.
the distance covered S=
=8 km/hour ×1 hour
=8 km
Hence the average speed of charlie is 8 km/hour and he covers a distance of 8 km in 1 hour.
Acoustics is the interdisciplinary science that deals with the study of mechanical waves in gases, liquids, and solids including vibration, sound, ultrasound, and infrasound. Cheers.