What kind of image is formed by a convex lens when the object is less than a focal length away from the object?A) an image that is always smaller than the object

B) none, because the lens is too close to the object

C) a virtual image

D) an inverted real image

Answers

Answer 1

Answer:

Answer:

Explanation:

An object that is less than a focal length from a convex lens forms a virtual, magnified image. When the object is closer to a convex lens than the focal point, its rays do not pass through the focal point to form an image on the opposite side of the lens.

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The force of repulsion between two identical positive charges is 0.800 N when the charges are 0.100 m apart. Find the value of each charge.
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What is the name for a star and planets held together by gravity? A. solar system B. galaxy C. black hole D. supernova

Answers

These answers aren´t valid .

The correct answer will be:

Planetary system.

What is the acceleration due to gravity of a feather? Is it smaller than that of an iron ball?

Answers

A hammer and a feather will fall with the same constant acceleration if air resistance is considered negligible. This is a general characteristic of gravity not unique to Earth, as astronaut David R. Scott demonstrated on the Moon in 1971, where the acceleration due to gravity is only 1.67 m/s2.

Final answer:

The acceleration due to gravity is the same for all objects near the surface of the Earth, regardless of their mass. The effect of air resistance may make it appear that the acceleration of a feather is smaller than that of an iron ball.

Explanation:

Acceleration due to gravity refers to the rate at which an object falls toward the Earth under the influence of gravity. The value of acceleration due to gravity varies depending on the location and mass of the object.

In general, the acceleration due to gravity is the same for all objects near the surface of the Earth, regardless of their mass. This means that the acceleration due to gravity of a feather is the same as that of an iron ball. However, due to the difference in air resistance, a feather will experience a much smaller net force compared to an iron ball, which may give the illusion of a slower acceleration.

Therefore, the acceleration due to gravity of a feather is not smaller than that of an iron ball, but the effect of air resistance makes it appear so.

Learn more about acceleration due to gravity here:

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Calculate the volume of 1280 kilograms of aluminium if the density of aluminium is 2700 kg/m³. Give your answer to 2 decimal places.

Answers

Answer:

The correct answer is 0.47 m³

Explanation:

The formula for density (d) is

Mass (m) ÷ volume (v)

Hence

d = m ÷ v

The density of aluminium (as provided in the question) is 2700 kg/m³ and the mass of aluminium is 1280 kg, the volume is however unknown.

Thus, from the formula earlier

2700 = 1280 ÷ v

v = 1280 ÷ 2700

v = 0.47 m³

The volume of aluminium when the density is 2700 kg/m³ and the mass is 1280 kg is 0.47 m³

Answer:

volume = 0.47 $m^(3)$ .

Explanation:

Density:

$d = (m)/(v)$

We have that d = 2700 kg/ $m^(3)$ and that we have 1280 kg of Al.

$2700 = (1280)/(V)$

V = 0.47 $m^(3)$

Explain how inertia and the shape of a loop counteract the force of gravity to keep riders from falling out when a roller coaster goes through a loop traveling upside down

Answers

When a roller coaster car goes through a loop, inertia keeps it from being pulled down by gravity. Inertia is the tendency of an object to resist a change in its motion, meaning that an object (the roller coaster car) which is already moving will resist forces that try to stop it. It will continue to try to move in a constant speed in a constant direction, even if other forces are slowing it down. The shape of the loop in a roller coaster is made so that the car can travel up it without losing its momentum. This is why a roller coaster car needs to be travelling at high speeds to go through a loop. If it weren't travelling quickly enough, the forces of gravity would pull it down before it could make it all the way through the loop.

Which two of the following are the densest of the materials shown?Material Mass (g) Volume (L)
Rock 1000 0.5
Pillow 200 10
Bottle of soda 2000 2
Loaf of bread 100 1

Answers

Answer:

The densest materials are rock and bottle of soda.

Explanation:

The density of material is given by,

Density = $(mass)/(volume)$

Case 1: Rock

Density = $(1000)/(0.5)$

Density = 2000 $(g)/(L)$

Case 2: Pillow

Density = $(200)/(10)$

Density = 20 $(g)/(L)$

Case 3: Bottle of soda

Density = $(2000)/(2)$

Density = 1000 $(g)/(L)$

Case 4: Load of bread

Density = $(100)/(1)$

Density = 100 $(g)/(L)$

The densest materials are rock and bottle of soda.

Do changes that cannot be easily reversed, such a burning, observe the law of conservation of mass? Explain.

Answers

Answer:

Yes

Explanation:

According to law of conservation of mass, it can neither be created or destroyed. It remains constant. It can change to energy. This can be explained using Einstein's mass energy relation. E= mc^2.

So, the changes such as burning cannot be reversed do obey law of conservation of mass. Suppose wood is burnt. The mass of wood converts into energy and ashes.

yes!!! Everything follows the law of

conservation of mass, no matter what

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