Answer:
Explanation:
Given
Force 
one at an angle of
East of North and another at
West of North
Net Force is in North Direction

Forces in horizontal direction will cancel out each other
thus Work done will be by north direction forces

here 

As we know that intensity of sound is defined as power received per unit area
so here the power of source is given as

distance of microphone is given as

now if loudspeaker is considered as spherical source then we will have


here
r = d = 60 m


Answer:
The value is 
Explanation:
From the question we are told that
The frequency of the second player is 
The beat frequency is 
The speed of sound is 
Generally the frequency of the note played by the first player is mathematically represented as

=> 
=> 
From the relation of Doppler Shift we have that

Here 
So

=> 
Answer: 
Explanation:
Given
Camera has an adjustable focal length ranging from
to
mm
Power is given by Reciprocal of focal length in meter
Power corresponding to 77 cm

Power corresponding to 224 cm

Therefore, the range of the power is 
Answer:944.4kg
Explanation:
Kinetic energy(ke)=425000 joules
Velocity(v)=30m/s
Mass=(2 x ke) ➗(v x v)
Mass=(2 x 425000) ➗ (30 x 30)
Mass=(850000) ➗ 900
Mass=944.4
Mass=944.4kg