Answer:
True
Explanation:
Velocity is a vector, therefore it consists of two elements:
- A magnitude (also called speed), which is the ratio between the displacement of the object and the time taken
- A direction, which corresponds to the direction of motion of the object
Therefore, velocity can be describes as positive or negative, depending on the direction which has been chosen as positive. If we chose the positive x-axis as positive direction, therefore:
- if the object is moving to the right (positive x-direction), the velocity will be positive
- if the object is moving to the left (negative x-direction), the velocity will be negative
So, in this case, since the velocity of the cart is negative, it must be moving to the left.
Answer: 1,600 seconds
Explanation:
31,360/9.8 = 3,200.
Then divide 3,200/2 = 1,600
A person is submerged of about 97.9%.
The average density of the human body is given as 979 kg/ m³.
<h3>Define Law of floatation.</h3>
Law of floatation can be defined as the volume of the liquid displaced when a body floats on the liquid surface is equal to the body submerged in the water.
As body has the stable equilibrium state, the buoyancy of the fluid will be equal to the weight.
Weight of the body floating = Weight of the body immersed in fluid
Law of floatation = Density of the floating object / density of fluid
As fluid is the freshwater here, the density of fluid will be 1000 kg/ m³.
= (979 kg/ m³) / ( 1000 kg/ m³)
= 97.9 %
A person is submerged when floating gently in fresh water about 97.9%.
Learn more about law of floatation,
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Answer:
b
Explanation:
Bar magnets have two magnetic poles
