PHYSICS HIGH SCHOOL

What occurs when a swimmer pushes through the water to swim?

Answers

Answer 1
Answer:

The correct answer to the question is that water will exert a force on the swimmer in forward direction, and swimmer will move along that direction.

EXPLANATION:

Before going to answer this question, first we have to understand Newton's third laws of motion.

Newton's third laws of motion states that, for every action, there is an equal and opposite reaction.

In the given question, the swimmer pushes the water in backward direction. This is the force of action. As per Newton's third law, the water must exert a reaction on the swimmer. The water applies a force on the swimmer in forward direction for which the swimmer can swim in the water.
Answer 2
Answer: When a swimmer pushes threw water to swim they are propelled forward because of the water resistance against the hand and feet.

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An electrical kettle uses 18A of current to boil 500ml of water. What is the electrical resistance of the kettle in ohms?

Answers


We can't tell from the given information.

Regarding the water, we don't know . . .
-- starting temperature
-- quantity of water
-- time in which the heater boiled it
so we don't know how much heat energy it takes to boil it.

Even if we DID know the total heat energy required, we don't know
the voltage supplied to the kettle's heating coil.  Together with the
current flowing in the heater, we need to know either its resistance
or the voltage across it in order to calculate the rate at which heat
energy is dissipated from the heater.

Which of the options is the best definition of a vector?A.a specific type of imaginary number
B.a quantity with both magnitude and direction
C.a magnitude described as a number
D.the magnitude of a value

Answers

the answer is B, the vector represents magnitude and direction

On Planet X, an astronaut has maximum walking speed of 1.9 m/s. The astronaut's legs are each 1.3 m long. What is the constant of acceleration due to gravity on Planet X?A. 8.3 m/s2
B. 2.8 m/s2
C. 3.8 m/s2
D. 1.1 m/s2

Answers

Answer:

Acceleration due to Gravity:

Explanation:

Here g is acceleration due to gravity. So C. 3.8 m/s2

Which one of the following statements about sulfuric acid is correct? A. Sulfuric acid is a known muriatic acid.
B. Sulfuric acid is a strong oxidizing agent.
C. Sulfuric acid is dangerous to living organisms.
D. Sulfuric acid has little effect on metals

Answers

The answer is C. Sulfuric Acid is dangerous to living organism

Direct contact with your skin and it will cause Chemical Burns , Direct contact with your eyes and it could cause a permanent Blindness.

This chemical also suck the water out of everything, so you can guess what will happen if it get into your body.

As an object increases in altitude, its mass: Decreases
OR remains the same

Answers

Answer:

Remains same

Explanation:

Mass of an object is measure of the matter it contains. It is independent of height. Commonly when we weigh something we measure its weight and not mass. Weight is a product of mass (m) and acceleration due to gravity (g).

As altitude changes, the amount of matter doesn't change thus the mass will remain constant. But due to the change in height the gravitational force will change and thus weight will vary.
No matter where you are, your mass stays the same. It's weight that changes. Also applies to any object.

Nonuniform positive acceleration

Answers


It means that acceleration changes with time.
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