Which of the following would you describe as a change in state?A) melting ice
B) burning paper
C) film being exposed to light
D) a piece of paper being cut in half

Answers

Answer 1

Answer: Melting ice is a change in state. (A)

Answer 2

Answer: A. Melting ice, because it is changing water from its solid state (ice) to its liquid state.

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Which of the following is not a reason fluorescent lamps are advantageous over incandescent lamps? A. Fluorescent lamps are more efficient than incandescent lamps. B. Fluorescent lamps operate at a higher temperature than incandescent lamps. C. Fluorescent lamps dissipate more energy as light instead of heat than incandescent lamps. D. Fluorescent lamps produce light with less glare than incandescent lamps.
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Draw velocity-ime graph for uniform moion of an object , when initially body is at rest.

Answers

When the body is at rest, its speed is zero, and the graph lies on the x-axis.

When the body is in uniform motion, the speed is constant, and the graph is a horizontal line, parallel to the x-axis and some distance above it.

It's impossible to tell, based on the given information, how these two parts of the
graph are connected. There must be some sloping (accelerated) portion of the graph
that joins the two sections, but it cannot be accounted for in either the statement
that the body is at rest or that it is in uniform motion, since acceleration ... that is,
any change of speed or direction ... is not 'uniform' motion'.

Calculate how long it takes for a stone falling from a bridge with an average acceleration downward of 9.8m/s^2 to hit the water. The stone starts from rest and hits the water with a velocity of 12.3m/s.

Answers

If the stone begins from rest and ends with a downward speed
of 12.3 m/s, then it must have spent

(12.3) / (9.8) = 1.26 seconds
falling.

Which of these are considered an oxidizing mutagenic agent?a. x-rays
b. benzopyrene
c. gamma rays

Answers

X - rays are considered an oxidizing mutagenic agent. The answer is letter A. X-rays are high energy electrons that can cause damage when exposed under extreme conditions. The best technology that can block it is t using a lightweight type of metal foam. It can take in high energy collisions which also exhibits high forces. it does not only block x-rays but also, neutron radiation and gamma rays.

Answer: X-rays is what's considered an oxidizing mutagenic agent

Which of the following is a characteristic of elements A. They are always metals
B. They cannot be divided into simpler substances
C. They break down when reacting with acids
D. They can be altered with and electric current

Answers

Answer:

Explanation:

They are the BASE elements. Cannot make them any simpler.

What is the potential energy of a 30 Newton ball that is on the ground

Answers

The potential energy of a 30N ball on the ground will be zero. With respect to height, h. Potential energy will be calculated like this. P=mgh. So if its on the ground relatively speaking the h=0. Thus inputting into the above formula. P=0.

a lump of putty and a rubber ball have equal mass. both are thrown with equal speed against a wall. the putty sticks to the wall. the ball bounces back at nearly the same speed with which it hit the wall. which object experiences the greater momentum change?

Answers

The bouncy ball experiences the greater momentum change.

To understand why, you need to remember that momentum is actually
a vector quantity ... it has a size AND it has a direction too.

The putty and the ball have the same mass, and you throw them
with the same speed. So, on the way from your hand to the wall,
they both have the same momentum.
Call it " M in the direction toward the wall ".

After they both hit the wall:

-- The putty has zero momentum.
Its momentum changed by an amount of M .

-- The ball has momentum of " M in the direction away from the wall ".
Its momentum changed by an amount of 2M .

Rubber ball will experience the greater momentum change than the lump of putty

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Further explanation

Newton's second law of motion states that the resultant force applied to an object is directly proportional to the mass and acceleration of the object.

$\large {\boxed {F = ma }$