HELP!!!!!! PLEASE!! I WILL GIVE 25 POINTS!!!!1) Joe and Ben were arguing about the Law of Conservation of Energy. Joe said that the Law of Conservation of Energy must be false because when you turn on a light it uses energy and so some of the energy is lost. Ben disagrees and says that energy cannot be created or destroyed. Who is right? Justify your answer.

A) Joe is right because the electricity is changed to heat and light and is no longer electricity.
B)Ben is right because the Law of Conservation of Energy is a law and cannot be false.
C) Ben is right because the electricity from the light is transformed into heat and light.
D) Joe is right because all electrical lights and appliances use electricity.

2) Greg and Shawn are studying for a physical science test. Greg thinks that the kinetic energy of an object depends on the height and speed of an object, but Shawn thinks it depends on the mass of an object. Who is right and why?

A) Shawn is right. The mass of an object determines the inertia of the object. Increasing inertia is the only thing that will increase kinetic energy..
B) Both Greg and Shawn are correct since kinetic energy depends on mass, height and speed of an object.
C) Greg is right. Increasing the height or speed of an object increases the kinetic energy of an object.
D) Neither is completely right. Shawn is partly correct since kinetic energy depends on mass, but Greg is also partly right since it also depends on speed.

3) Dan got into his car in the middle of summer. When he sat on the hot black leather seats, he burned his legs. His sister said that conduction was the reason Dan burned his legs, but Dan blamed the sunshine and said it was radiation that caused him to get burned. Who was right and why?

A) Both Dan and his sister are right. The sun heated the car seats through radiation heat transfer, but then Dan touched the seat and the heat was conducted to his legs.
B) Dan's sister was correct because Dan's legs touched the car seats. That is an indicator of heat transfer by conduction.
C) Dan was right because the sun heated the car without touching it. That is radiation.
D) Dan's sister was right because conduction can transfer heat through both solids and fluids (such as air).

Answers

Answer 1

Answer:

1) C) Ben is right because the electricity from the light is transformed into heat and light.

Explanation:

The Law of Conservation of Energy states that energy cannot be created nor destroyed, but only transformed.

In this particular example, energy is not destroyed. In fact, the electrical energy (produced, for instance, by the battery inside the torchlight) is converted into light (electromagnetic wave) and heat (thermal energy). So, Ben is right, because energy is just transformed into other types of energy.

2) D) Neither is completely right. Shawn is partly correct since kinetic energy depends on mass, but Greg is also partly right since it also depends on speed.

Explanation:

The kinetic energy of an object is given by:

$K=(1)/(2)mv^2$

where m is the mass of the object and v its speed. From the formula, we see that neither Shawn nor Greg is completely right, because the kinetic energy depends both on the mass and the speed, and:

- Greg only told about the speed

- Shawn only told about the mass

3) B) Dan's sister was correct because Dan's legs touched the car seats. That is an indicator of heat transfer by conduction.

Explanation:

Conduction is the method of heat transfer that occurs between two solid objects, when they are in contact with each other, and it is due to the collisions between the molecules of the two objects: when colliding, the molecules of the hotter object transfer part of their kinetic energy to the molecules of the colder object.

In this case, Dan legs are in contact with the car seat (which is at higher temperature), so heat is transferred from the seat to Dan legs by conduction.

Answer 2

Answer:

3 is B my dude and the reason nobody answered is because thousands of questions are asked every day. So not every question can be answered. It doesn't have to do with being lazy.

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Which describes Newton's law of universal gravitation?Gravitational force is directly proportional to the distance between objects.
All objects repel all other objects.
Gravitational force increases with distance.
All objects attract all other objects.

Answers

Answer:all object attracts all other objects

Explanation:

All objects attracts all other objects

a person pushing a stroller starts from rest, uniformly accelerating at a rate of 0.500 m/s2. What is the velocity of the stroller after it has traveled 4.75 m ?

Answers

Answer:

Approximately $2.18 m\cdot s^(-1)$ .

Explanation:

Consider one of the equations for constant acceleration ("SUVAT" equations)

$v^(2) - u^(2) = 2 \; a \cdot x$ ,

where

$v$ is the final velocity of the object,
$u$ is the initial velocity of the object,
$a$ is the acceleration of the object, and
$x$ is the distance that the object had traveled while its velocity changed from $u$ to $v$ .

Note that unlike other SUVAT equations, this one does not ask for the time required for the speed of the object to change from $u$ to $v$ . Since in this problem, time isn't given, this time-less equation would particular useful.

Here

$v$ the final velocity needs to be found.
$u = 0$ for the stroller started from rest.
$a =\rm 0.500 \;m \cdot s^(-2)$ is the acceleration of the stroller, and
$x = \rm 4.75\; m$ is the distance that the stroller traveled while its velocity changed from $u$ to $v$ .

Rearrange the equation to isolate the unknown, $v$ :

$v^(2) = u^(2) + 2 \; a \cdot x$ .

Make sure that all units are standard, so that the unit of the output will also be standard. Apply the equation:

$v = \sqrt{u^(2) + 2 \; a \cdot x} = √(0^2 + 2 * 0.500 * 4.75 )\approx \rm 2.18\; m\cdot s^(-1)$ .

Hence the final velocity will be approximately $\rm 2.18 m\cdot s^(-1)$ .

Who is the silentest that revised the atomic modle

Answers

Bohr is the scientist you are looking for my friend...;)

Which of the following is true statement about isotopes?A.
The number of protons always equals the number of neutrons in all isotopes.

B.
The number of protons never equals the number of neutrons in an isotope.

C.
Different isotopes for the same element will always have the same numbers of neutrons.

D.
Different isotopes for the same element always have the same number of protons.

Answers

Answer:

D. different isotopes for the same element will always have the same numbers of neutrons.

Explanation:

An isotope is the different variant of an element that has different number of neutron. There are various elements found in nature that have different isotopes.

Number of neutrons present in atom is different for the same element which makes the mass of one isotope different from the another.

Example of such isotope : Isotope of hydrogen are Protium, Deuterium and Tritium.

Final answer:

Different isotopes for the same element will always have the same numbers of neutrons.

Explanation:

The correct statement about isotopes is C. Different isotopes for the same element will always have the same numbers of neutrons. Isotopes are variants of an element that have the same number of protons but different numbers of neutrons. The number of protons in an element determines its atomic number, whereas the sum of protons and neutrons determines its atomic mass. So, while isotopes of the same element have the same number of protons, they can have different numbers of neutrons.

Learn more about Isotopes here:

brainly.com/question/27475737

#SPJ6

Which scientist was the first to propose the heliocentric model of the universe? A. Aristotle B. Isaac Newton C. Galileo Galilei D. Nicolaus Copernicus

Answers

The answer would defiantly be option D "Nicolaus Copernicus." Copernicus was first to purpose the model of the universe, back in 1543 he presented a heliocentric model of the universe, he also made a geocentric model.

Hope this helps!

Nonportrit

Answer:

Option (D)

Explanation:

Heliocentric model was discovered by the great scientist Nicolaus Copernicus.

According to the Heliocentrism theory, the sun is believed to be located at the center of our solar system and earth along with other planets revolves around it in a circular path.

There were certain limitation of this theory. This theory was unable to describe why the stars most of the time exist to be at the same place, inspite of the frequently changing positions of earth as it revolves around the sun.

Thus, the correct answer is option (D).

Select the correct answer.Rita is about to buy a house. She looks at houses in a good neighborhood that’s well known for its excellent community policing.. What need is she trying to fulfill according to Maslow’s hierarchy of needs?
A.
self-actualization
B.
esteem
C.
safety
D.
physiological

Answers

the answer would be c because it is talking about she wants to be in a good neighborhood

I would say c, if she is looking in a good neighborhood with good policing, then she wants to be safe.

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