PHYSICS HIGH SCHOOL

How dose an atom become an ion with a -2 charge?

Answers

Answer 1

Answer: A atom can become an ion with a -2 charge, if it gains 2 electrons during a chemical reaction.

15 kg

Explanation:

The mass of the object can be found by using the formula

$m = (f)/(a) \n$

f is the force

a is the acceleration

From the question we have

$m = (147)/(9.8) \n$

We have the final answer as

15 kg

Hope this helps you

A 20 kg crate of books is at rest on a table. what is the normal force on the books?

Answers

The weight of 20 kg is

(mass) x (gravity) =

(20 x 9.8) = 196 newtons, downward.

There must be a force of 196 newtons upward on the mass.
Otherwise the mass is accelerating either up or down.

Where should an object be placed in front of a concave mirror’s principal axis to form an image that is real, inverted, larger than the object, and farther from the mirror than the object is?

Answers

Answer:

At focus.

Explanation:

When the object is placed at the focus of a concave mirror, the image will form at infinity. The formed image is real and inverted and its size is highly enlarged.

When the object is placed between the pole and the focus, the image will formed behind the mirror. The formed image is virtual and erect and its size is enlarged. This is the only case when the formed image is virtual and erect.

if the object is kept in between the principle axis and the focus but some what nearer to the focus then we will get the enlarge,erect,and real image.

Which of the following can be determined by studying the spectrum of a star?the chemicals in the atmosphere of the star
the motion of the star
the temperature of the atmosphere of the star
all of the above

Answers

Answer:

all of the above

Explanation:

The spectrum of the star is is used to study its composition, motion and surface temperature. The absorbed or emitted wavelength indicates the elements present. The peak wavelength determines the surface temperature of the star using Wein's law. Peak wavelength is inversely proportional to temperature. The red-shift or blue shift indicates whether the star is moving away or towards us.

The right answer for the question that is being asked and shown above is that: "all of the above." the following that can be determined by studying the spectrum of a star includes: the chemicals in the atmosphere of the star; the motion of the star; the temperature of the atmosphere of the star.

Energy waves traveling at the speed of light are called _____.conduction particles
convection waves
radiation
atomic energy

Answers

RADIATION

There are three types of heat transfer or heat propagation; conduction, convection and radiation. Heat transfer is the process by which heat projects externally however, depending on the temperature and pressure. Also called the movement of heat from a low temperatured state which increases as heat progresses.
Conduction is the heat transfer by contact, immediate contact.
Convection is the transfer of heat through air and water.
Radiation is the transfer of heat regardless of the presence of atoms or particles.

Radiation is the answer.

What is the speed of a 500 kg elevator that has 4000 J of energy ?