Answer:
40,000N
Explanation:
Force = Acceleration × Mass
2000×20=40,000
Answer:
Option (b)
Explanation:
let the weight of boat is W. In equilibrium condition, the weight of boat is equal to the buoyant force acting on the boat.
The buoyant force acting on the boat is equal to the weight of water displaced by the boat.
In case of fresh water:
Weight of the boat = weight of fresh water displaced by the boat
W = Volume of fresh water displaced x density of fresh water x g
W = V x 1 x g
W = V x g ....... (1)
In case of salt water:
Let the volume of salt water displaced is V'.
Weight of the boat = weight of salt water displaced by the boat
W = Volume of salt water displaced x density of salt water x g
W = V' x 1.02 x g ..... (2)
Equate equation (1) and equation (2), we get
V x g = V' x 1.02 x g
V' = 0.98 V
Thus, option (b) is true.
Answer:
The roaring of the lion is louder and has low pitch than the sound produced by a mosquito. Hence, they sound so different
Answer:
The mass of the hailstone is 
Explanation:
From the question we are told that
The mass of the hockey puck is 
The initial speed of the puck is 
The final speed of the puck is 
According to the principles of linear momentum
At initial the velocity of the hailstone was zero so
So
substituting values
=> 
=> 
=>
