Describe how a mold fossil is related to a cast fossil.
1 answer:
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Answer:
Option (A) , (b) and (d) are correct option
Explanation:
According to Coulomb's law electric force between two charges is given by
From the relation we can say that force is directly proportional to magnitude of charges and inversely proportional to distance between them '
So if we increase the distance then force will decrease
Increase if any of the charge get larger
If force is attractive then both the charge will be of different sign and is force is repulsive then both the charges of same sign
From above conclusion we can say that (a), (b) and (d) are correct option
Answer:
Acceleration,
Explanation:
Given that,
Initial velocity, u = 20 m/s
Final velocity, v = 60 m/s
Time, t = 10 s
We need to find the acceleration of the car. It is equal to the change in velocity divided by time.
So, the acceleration of the car is .
Answer:
The net force acting on the person is 5.34 N acting upwards
Explanation:
The information given are;
Mass of the person = 55.0 kg
Density of the person = 1010 kg/m³
Body volume of the person = Mass/Density = 55/1010 = 0.0545 m³
Weight of the person = Mass × Gravity = 55 × 9.81 = 539.55 N↓
Where the density of water = 1000 kg/m³, we have;
Upthrust = weight of the water displaced = Mass of the water displaced × Gravity
Mass of the water displaced = Density of water × Volume of the water
Mass of the water displaced = Density of water × Body volume of the person
= 1000 × 0.0545 = 54.5 kg
The Upthrust = 54.5 × 9.81 = 534.21 N↑
Given that the net force, acting is the sum of the mass of forces acting on the person which are the weight acting downward and the upthrust acting upwards
We have;
F(Net) = 534.21↑ - 539.55↓ = 5.34 N↑
The net force acting on the person = 5.34 N upwards.