TopAcademicTutors.Com

Expert Assignment Help for students who have pending assignments.

For 10$ a page, you can get your written essay.

Tell us your requirements

Posted in Physics

1. Which of the following is NOT part of John Dalton's atomic theory? A. All elements are composed of atoms. B. All atoms of the same element have the same mass. C. Atoms contain subatomic particles. D. A compound contains atoms of more more than one element. 2. Who provided evidence for the existence of a nucleus in an atom? A. John Dalton B. J. J Thomson C. Democritus D. Ernest Rutherford


1. C
His theory did not incorporate the existence of subatomic particles.

2. D

Related Questions

Posted in Physics

What mass (in mg) does 2.63 moles of nickel have?

To convert the amount in moles to units of grams, we need the atomic mass of nickel which is 58.69 g/mol. We multiply the number of moles to the atomic mass which cancels moles leaving us with units of grams.

2.63 moles ( 58.69 g/mol ) = 154.35 g Nickel

Hope this answers the question. Have a nice day.

Posted in Physics

What happens when the temperature of an object increases? A. The particles move closer together. B. The particles move faster. C. The number of particles increases. D. The particles stop moving.

I believe the correct answer from the choices listed above is option B. When the temperature of an object increases, the particles move faster since kinetic energy of the molecules increases. Hope this answers the question. Have a nice day.

Posted in Physics

In 2004 astronomers reported the discovery of a large Jupiter-sized planet orbiting very close to the star HD 179949 (hence the term "hot Jupiter"). The orbit was just 19 the distance of Mercury from our sun, and it takes the planet only 3.09 days to make one orbit (assumed to be circular). What is the mass of the star? Express your answer (a)in kilograms and (b)as a multiple of our sun's mass.

  I'll tell you how to do it but you must crunch the numbers. 

Use Kepler's 3rd Law 

T^2 = k R^3 

where k = 4(pi)^2/ GM 
G =gravitational constant = 6.67300 × 10-11 m3 kg-1 s-2 
M = mass of this new planet 
pi = 3.14159265 
T =3.09 days = 266976 seconds 
R = (579,000,000km)/9 = 64333333.3 km 

a) 
Solve Kepler's 3rd Law for M. Your answer will be in kg 


b) 
mass of the sun = 1.98892 × 10^30 kilograms 
Form the ratio 
M(planet)/M(sun) 

TopAcademicTutors.Com

Expert Assignment Help for students who have pending assignments.

For 10$ a page, you can get your written essay.

Tell us your requirements

Posted in Physics

A snowmobile has an initial velocity of 3.0 m/s Part 1: If it accelerates at the rate of 0.5 m/s/s for 7.0 sec, what is the final vel.? Part 2: If it accelerates at the rate of -0.60m/s/s, how long will it take to reach a complete stop?

Answer:

Part a)

v_f = 6.5 m/s

Part b)

t = 5 seconds

Explanation:

Part a)

As we know that

v_f = v_i + at

here we know that

v_i = 3 m/s

a = 0.5 m/s^2

t = 7.0 s

so we will have

v_f = 3 + (0.5)(7.0)

v_f = 6.5 m/s

Part b)

if finally the snowmobile comes to rest

So here we can say that

v_f = 0

v_i = 3.0 m/s

a = -0.60 m/s^2

so now we have

v_f = v_i + at

0 = 3.0 - (0.60)t

t = 5 s

Posted in Physics

Nuclear reactions result in tremendous amounts of a. uranium. b. energy. c. fission. d. mass.

I believe the correct answer from the choices listed above is option B. Nuclear reactions result in tremendous amounts of energy. nuclear reaction is considered to be the process in which two nuclear particles interact to produce two or more nuclear particles or ˠ-rays. Hope this answers the question.

Posted in Physics

Which tools would be use to find an irregularly shaped object’s mass and volume?

Scales for weight
Any beaker to measure the volume of liquid displaced

TopAcademicTutors.Com

Expert Assignment Help for students who have pending assignments.

For 10$ a page, you can get your written essay.

Tell us your requirements

Posted in Physics

The stress force that causes a mass of rock to pull or twist in opposite directions in called ______.

Shearing

The stress force that causes a mass of rock to pull or twist in opposite directions is called shearing.

Hope this helps! :)

Posted in Physics

1. How many correct experiments do we need to disprove a theory? How many do we need to prove a theory? Explain. 2. A guidebook describes the rate of climb of a mountain trail as 120 meters per kilometer. How can you express this as a number with no units?

1.  You can never prove a theory. All theories and laws and scientific knowledge in general is provisional. If your theory is inconsistent with an experiment (and you are sure the experiment is correct), your theory needs to be pitched or modified.

2. 
change the meters to kilometers; 

120 m/km = .12 km/km = .12 

or the kilometers to meters; 

120 m/km = 120 m/1000m = .12 

This sounds like its telling you how far you climb vertically (.12 km) for every 1 km that you walk along the slanted, winding trail. 

The unitless number ".12" is usefull because now you can think of the rate of climb in any units you want. So you rise vertcally .12 miles for every mile you walk the trail, or you rise .12 ft for every foot you walk the trail, etc.

TopAcademicTutors.Com

Expert Assignment Help for students who have pending assignments.

For 10$ a page, you can get your written essay.

Tell us your requirements

Posted in Physics

Will upvote!! True or False- The parts of a mixture keep their own properties when they are combined.

I believe the correct answer is false. The parts of a mixture do not keep their own properties when they are combined. When they are combined, they exhibit or behave with different properties since each atom is bonded which gives them unique properties. Hope this helps.

TopAcademicTutors.Com

Expert Assignment Help for students who have pending assignments.

For 10$ a page, you can get your written essay.

Tell us your requirements

Posted in Physics

A net force of 125 N accelerates a 25.0 kg mass. What is the resulting acceleration?

Answer: a=5 m/s^2

Explanation:

The acceleration of an object can be calculated by using Newton's second law:

F=ma

where

F is the net force applied on the object

m is the mass of the object

a is its acceleration

In this problem, we have F=125 N and m=25.0 kg, so we can rearrange the equation to calculate the acceleration:

a=\frac{F}{m}=\frac{125 N}{25.0 kg}=5 m/s^2

TopAcademicTutors.Com

Expert Assignment Help for students who have pending assignments.

For 10$ a page, you can get your written essay.

Tell us your requirements

Posted in Physics

Which of the following parts of an organism is most likely to become fossilized? A.)tooth B.)skin C.)heart D.)Lung

The tooth because skin, the heart, and a lung are all soft tissue and are less likely to become fossilized. Whereas the tooth is a hardened material like bones. :)

TopAcademicTutors.Com

Expert Assignment Help for students who have pending assignments.

For 10$ a page, you can get your written essay.

Tell us your requirements

Posted in Physics

Which parts of an electric generator are connected? two brushes two slip rings the armature and axle the armature and commutator

I think the correct answer from the choices listed above is the last option. The parts of an electric generator that are connected are the armature and commutator.  An armature generally refers to one of the two principal electrical components of an electromechanical or electrical machine. Hope this helps. Have a nice day.

TopAcademicTutors.Com

Expert Assignment Help for students who have pending assignments.

For 10$ a page, you can get your written essay.

Tell us your requirements

Posted in Physics

If you increase the force on an item without changing the mass you increase acceleration? true or false?

(F)(M)=A
Force times Mass equals Acceleration.
The answer is TRUE. 
If the mass increases the number on the left side of the equation increases, thus increasing the right side as well.

Posted in Physics

The acceleration due to gravity on Earth is 9.80 m/s2. An African elephant can have a mass up to 6,050 kg. What is its weight?

The weight on earth is equal to m*g, where m is the mass and g is the gravitational force. 6050 (m) * 9.8 (g) = 59290 Newtons.

TopAcademicTutors.Com

Expert Assignment Help for students who have pending assignments.

For 10$ a page, you can get your written essay.

Tell us your requirements

Posted in Physics

If a substance containing charged ions and electrons can be compressed so that the particles have less space between them, the substance is a gas. plasma. solid. liquid.

Answer: Option (b) is the correct answer.

Explanation:

Plasma is a hot ionized gas that contains approximately equal number of both positive ions and negatively charged electrons.

Thus, we can conclude that if a substance containing charged ions and electrons can be compressed so that the particles have less space between them, the substance is a plasma.

Posted in Physics

Rounded to the nearest whole number, what is the atomic mass of platinum? 78 117 195 273

Answer: The atomic mass of the platinum will be 195.

Explanation:

We know that,

Atomic mass is the sum of the electrons and protons.

Platinum is the chemical element and it is the symbol is Pt. The atomic number of the platinum is 78 and the atomic mass is the 195,084 u.

According to the question,

Rounded to the nearest whole number

Hence, The atomic mass of the platinum will be 195.

TopAcademicTutors.Com

Expert Assignment Help for students who have pending assignments.

For 10$ a page, you can get your written essay.

Tell us your requirements

Posted in Physics

Crystals can have _____ bonds between their atoms. ionic covalent metallic all types of

Answer;

All types of

Crystals can have all types of  bonds between their atoms.

Explanation;

  • Crystals are solid materials which contains atoms, molecules or ions that are arranged in a complex structure forming a crystal lattice.
  • Crystals may have all types of bonds, these includes; ionic bonds, formed as a result of transfer between a metallic bond and a non-metal atom, Covalent bond, formed as a result of sharing electrons between non metal atoms, hydrogen bonds, metallic bonds Van der Waals bonds, etc.

Posted in Physics

What is meant by the following statement? "Acceleration is inversely proportional to mass."

Answer:

he gave the correct answer its just we had options when we were doing this assignment so thanks for going in depth

Explanation:

Ps Odsseyware

Posted in Physics

Water is a compound because it?

forms chemical bonds with two or more atoms.

TopAcademicTutors.Com

Expert Assignment Help for students who have pending assignments.

For 10$ a page, you can get your written essay.

Tell us your requirements