﻿ Questions posted in Physics - AssignmentGrade.com

# Questions posted in Physics

### In the series circuit, is the current constant throughout the circuit, or does it vary?

If the voltage is constant (DC like a battery, not AC), there are only resistors in the circuit (not capacitors or inductors) and the resistance doesn't vary, then the current through any circuit is constant.

ANSWERED AT 01/04/2020 - 01:46 PM

QUESTION POSTED AT 01/04/2020 - 01:46 PM

### A 7.5 kg block is placed on a table. If its bottom surface area is 0.6 m2, how much pressure does the block exert on the tabletop? A. 73.5 Pa B. 122.5 Pa C. 367.5 Pa D. 226.5 Pa

A 7.5 kg block is placed on a table. If its bottom surface area is 0.6 m2, how much pressure does the block exert on the tabletop?

A. 367.5 Pa

B. 122.5 Pa

C. 73.5 Pa

D. 226.5 Pa

ANSWERED AT 01/04/2020 - 01:46 PM

QUESTION POSTED AT 01/04/2020 - 01:46 PM

### How will our Sun die?

Our Sun is in the main sequence star stage.
From there our Sun will evolve to be a red giant.

When it evolves many many years from now it will engulf all of the inner planets. But don't worry, that won't happen in our lifetime!

From there the red giant (sun) will die. The death of a red giant is known as a planetary nebula. Though at the center of the nebula there is still a burning core.
When the debris flies away from the planetary nebula, our Sun will turn into a white dwarf, then the core will burn out which gives us a black dwarf.

I've provided an image of a good life cycle of the star, if you follow along with the brief description I've given you it should make sense!

If you have any questions let me know! I hope this helps!

ANSWERED AT 01/04/2020 - 01:45 PM

QUESTION POSTED AT 01/04/2020 - 01:45 PM

### Sarah roller skates 18.5km in 3 1/2 hours. what is her average speed in kilo per hour?

5.2857 km/hrs... formula: speed = distance/time

ANSWERED AT 01/04/2020 - 01:45 PM

QUESTION POSTED AT 01/04/2020 - 01:45 PM

### A train travels 92 miles in 11 1/2 hours. what is its average speed in miles per hour?

The answer is 8 miles per hour

ANSWERED AT 01/04/2020 - 01:44 PM

QUESTION POSTED AT 01/04/2020 - 01:44 PM

### What is the distance between a point on one wave and the same point on the next cycle of the wave called

It is called the wavelength

ANSWERED AT 01/04/2020 - 01:44 PM

QUESTION POSTED AT 01/04/2020 - 01:44 PM

### If you were trying to design the most efficient fission reactor possible, what ratio of U-235 to U-238 would you want? Explain why.

U238 would not be used in the reactor.  It requires high energy neutrons to split, whereas U235 is more easily split with low energy neutrons

ANSWERED AT 01/04/2020 - 01:43 PM

QUESTION POSTED AT 01/04/2020 - 01:43 PM

### Which body have a period of revolution of 29.6 days? A.The sun B.Earth C.The moon D. Jupiter

The moon is the closest one on the list. Its period of revolution around the Earth is 27.32 days. (But the length of the cycle of phases, like from one Full Moon to the next one, is 29.53 days.)

ANSWERED AT 01/04/2020 - 01:42 PM

QUESTION POSTED AT 01/04/2020 - 01:42 PM

### What causes a bolt of lightning? A. Electrical charges build up in the clouds only. B. Electrical charges build up on the ground only. C. Electrical charges build up in the clouds and on the ground. D. Electrical charges build up in the space between the clouds and the ground.

Just finished the quiz and C was correct :)

ANSWERED AT 01/04/2020 - 01:41 PM

QUESTION POSTED AT 01/04/2020 - 01:41 PM

### why can a thick atmosphere can help protect a planet from meteors

The atmosphere is created from a bunch of gases, it is held in place by the gravity, the friction of the atmosphere will cause the meteor to burn up before it even gets a chance to come in to view.

ANSWERED AT 01/04/2020 - 01:40 PM

QUESTION POSTED AT 01/04/2020 - 01:40 PM

### Every mass is attracted to earth other in the universe through_____. A.Electrostatic B.Magnetic Force C.The force of gravity D.Nuclear force

C is ur answer amigo hope I helped!

ANSWERED AT 01/04/2020 - 01:38 PM

QUESTION POSTED AT 01/04/2020 - 01:38 PM

### The study of science deals with

There are many different aspects of science. Natural science, social science, the study of biology, chemistry, physics, engineering, medicine...

ANSWERED AT 01/04/2020 - 01:37 PM

QUESTION POSTED AT 01/04/2020 - 01:37 PM

### The concentration of an isotope is 1/500 of its initial value after one day. What is the rate of decay?

The exponential growth/decay formula is given by A = Pe^(rt), where A is the final amount, P is the initial amount, r is the rate of growth/decay and t is time.

We are given A = (1/500)P and t=1, so substituting:
(1/500)P = Pe^(r*1)
Cancelling out P on both sides:
1/500 = e^r
ln(1/500) = ln(e^r)
r = -6.215

Rate of decay is -6.215 per day.

ANSWERED AT 01/04/2020 - 01:37 PM

QUESTION POSTED AT 01/04/2020 - 01:37 PM

### Why don’t hurricanes form over land?

"A hurricane gets its energy from enormous volumes of warm, moist air, which are not present over landmasses."

ANSWERED AT 01/04/2020 - 01:36 PM

QUESTION POSTED AT 01/04/2020 - 01:36 PM

### A circuit that has only a single path for current to flow through is best classified into which category?

A series circuit

Explanation:

A circuit that has only a single path for current to flow through is best classified into which category?

a series circuit

an open circuit

a parallel circuit

a short circuit

Explanation:

The reason that A ( a series circuit ) is the answer is because in a series circuit, it only allows for current to flow in one single path.

ANSWERED AT 01/04/2020 - 01:35 PM

QUESTION POSTED AT 01/04/2020 - 01:35 PM

### What is the most important use of an element's atomic number?

It tells how many protons the element has

ANSWERED AT 01/04/2020 - 01:35 PM

QUESTION POSTED AT 01/04/2020 - 01:35 PM

### If you were going to invent a new way to power your mobile phone, which type of electromagnetic wave would be most useful to investigate? Radio waves, because they are high energy and common. Gamma rays, because they are strong and safe. X–rays, because they are low energy and safe. Ultraviolet rays, because they are moderate energy and abundant. Only respond if you are 100% sure. Thank you!!

The correct answer to the question is : D) Ultraviolet rays, because they are moderate energy and abundant.

EXPLANATION;

Before going to answer this question, first we have to know the nature of electromagnetic waves.

As per electromagnetic spectrum, the gamma wave has more frequency as compared to other electromagnetic waves. After gamma wave, X-rays come. Hence, gamma ray and X-ray are more energetic as compared to others, and more harmful. They are not safe.

Radio wave has the least frequency in the periodic table. Hence, it has less energy.It is also less harmful as compared to other electromagnetic waves.

As per the option, the radio wave has high energy which is wrong.

Ultraviolet rays have moderate energy. It is harmful but not so much like X-rays and gamma rays. It is abundant as it is coming from sun.

Hence, the proper answer of this question is ultraviolet rays.

ANSWERED AT 01/04/2020 - 01:35 PM

QUESTION POSTED AT 01/04/2020 - 01:35 PM

### Galaxies are separated by? A.Varied distance B.Moderate distance C.Extremely large distance D.Extremely small distance

Ur answer is c amigo ! ^---^ hope I helped

ANSWERED AT 01/04/2020 - 01:31 PM

QUESTION POSTED AT 01/04/2020 - 01:31 PM

### Which of these is outside of the solar system? A.Sun B.Galaxy C.Saturn D.Moon

The galaxy is outside the solar system.

The solar system is just the sun, planets and their moons. Basically, the solar system is inside the galaxy. So the galaxy is outside the solar system.

ANSWERED AT 01/04/2020 - 01:28 PM

QUESTION POSTED AT 01/04/2020 - 01:28 PM

### Does anyone else have this packet for Principles of Engineering? I'm lost on everything and just need the equations to start the problem and then I'm good lol PLEASE HELP

ANSWERED AT 01/04/2020 - 01:27 PM

QUESTION POSTED AT 01/04/2020 - 01:27 PM

### Before a cell enters mitosis, what happens to the genetic information in that cell?

Before a cell could undergo to the process of mitosis, the cell will have to undergo first to the stage of interphase. Where it will need to pass though three stages where it will prepare before it could undergo to cell division. The cell will most likely pass to G1, S and G2 phase for it to be checked and prepared before it passes through the mitosis.

ANSWERED AT 01/04/2020 - 01:25 PM

QUESTION POSTED AT 01/04/2020 - 01:25 PM

### What affect the amount of gravity between two objects? A.Density and mass B.Distance and weight C.Mass and weight D.Mass and distance between the objects.

The masses of both objects and the distance between their centers.

ANSWERED AT 01/04/2020 - 01:24 PM

QUESTION POSTED AT 01/04/2020 - 01:24 PM

### The force you exert on machine is called the?

The force you exert on machine is called the input force

ANSWERED AT 01/04/2020 - 01:24 PM

QUESTION POSTED AT 01/04/2020 - 01:24 PM

### Which statements accurately describe density? Check all that apply.

I think the answer is, density is the ratio of mass to volume.

Density is the term used to describe the relation between mass of liquid to a volume.  A denser liquid is lighter.   It can be observed on liquids that float on tops of another like oil and water.

ANSWERED AT 01/04/2020 - 01:24 PM

QUESTION POSTED AT 01/04/2020 - 01:24 PM

### What are nonmetals in general

Nonmetals include common gasses that are found in the atmosphere, such as nitrogen and oxygen, as well as sulfur (S) and carbon too. Nonmetals are usually not good conductors of heat and electricity.

ANSWERED AT 01/04/2020 - 01:22 PM

QUESTION POSTED AT 01/04/2020 - 01:22 PM

### Metal are good conductors of electricity true or false

Very true metal is one of the biggest conductors of electricity

ANSWERED AT 01/04/2020 - 01:21 PM

QUESTION POSTED AT 01/04/2020 - 01:21 PM

### If a substance has a temperature of absolute zero, what can you say about the kinetic energy of the substance’s particles?

They would stop moving and have zero energy. The rules of quantum mechanics don't allow particles to be completely still so we cannot actually get to absolute zero

ANSWERED AT 01/04/2020 - 01:18 PM

QUESTION POSTED AT 01/04/2020 - 01:18 PM

### Explain why it is important for scientists to balance open-mindedness and skepticism.

Because if they are too skeptic then they might never discover something new and if they are too open-minded they will believe any thing so you have find a good balance.

ANSWERED AT 31/03/2020 - 10:45 AM

QUESTION POSTED AT 31/03/2020 - 10:45 AM

### The service box is an area on the court that _________ . (Tennis Questions By The Way)

The service box is an area on the court that a serve is supposed to land in.

ANSWERED AT 31/03/2020 - 10:41 AM

QUESTION POSTED AT 31/03/2020 - 10:41 AM

### What ions are made of more than one atom

These ions are polyatomic ions. The prefix "poly-" means "many," and the rest of the word "atomic" clearly refers to the atoms themselves. So, if there are two or more atoms in an ion, this ion is polyatomic.

ANSWERED AT 31/03/2020 - 10:40 AM

QUESTION POSTED AT 31/03/2020 - 10:40 AM