PHYSICS MIDDLE SCHOOL

Why does a smaller car get better gas mileage than a bigger one?​

Answers

Answer 1
Answer:

Answer:

Vehicle weight is the biggest single enemy of fuel economy. A heavy vehicle simply needs more power than a smaller one to produce

Explanation:


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HIGH SCHOOL

Calculate the density of a solid cube that measures 4.53 cm on each side and has a mass
of 519 g.
Answer in units of g/cm3

Answers

Ok so if each side is 4.53 cm, we can multiply 4.53 x 4.53 x 4.53 to get the volume (since v= l x w x h). Density equals mass/volume, so

519 g/4.53 cm 
114.57 g/cm^3 (since none of the units cancel)
MIDDLE SCHOOL

Why are protons in an atom so important? Question 8 options: There are more protons than electrons or neutrons in a neutral atom. Protons determine the atoms' identity (type of element) and where it is located on the periodic table. Protons determine an atom's chemical properties and how it will react with other elements. Protons are bigger than all the other particles in an atom.

Answers

The answer is the second option "Protons determine the atom's identity (type of element) and where it is located on the periodic table." Protons determine the element if the number of protons kept changing then the element would keep changing and there would be no use for the periodic table. Electrons have the same amount of protons and neutrons are determined by subtracting the atomic mass to the atomic number.

Hope this helps!

MIDDLE SCHOOL

A stationary front is the starting point in the formation of which of the following? Question options:
B is wrong
A.midlatitude cyclone

B.tornado<-this is wrong

C.thunderstorm

D.tropical cyclone

Answers

The Answer is Midlatitude Cyclone, I just took the test. 

Answer:

midlatitude cyclone

Explanation:

HIGH SCHOOL

what essential characteristic does a good experiment have? a. a control group is given the experimental treatment. b. a single variable is tested. c. a control is used. d. both b and c

Answers

A. A control group is given the experimental treatment.
HIGH SCHOOL

Which of the following units is the SI unit of velocity? a. meter c. meter per second b. meter·second d. second per meter

Answers

C. meter per second

Velocity and speed share the same SI unit.
MIDDLE SCHOOL

9. Calculate the distance (in km) that Charlie runs if he maintains the average speed from question 8 for 1 hour.

Answers

Correct Question:

Calculate the distance (in km) charlie runs if he maintains an average speed of 8 km/hr for 1 hour

Answer:

The total distance covered by Charlie is 8 km in 1 hour.

Explanation:

The average velocity as given in the question is,

v = 8 km/hr

Total time taken,

As we know the formula to evaluate the total distance d when the average velocity and time is given;

Hence, the total distance covered by Charlie in 1 hour will be 8 km.

MIDDLE SCHOOL

What makes a planet a dwarf planet?

Answers

If a plant is under 700km in diameter it is considered a dwarf planet, according to the international astronomical union it must orbit around the sun, be massive enough to be in hydrostatic equilibrium, and it has cleared the neighborhood around its orbit.
HIGH SCHOOL

What planet has a visible mark referred to as the the Great Red Spot?

Answers

Jupiter  that is the answer

good luck

Answer:

The planet that has a visable red spot is Neptune.

Explanation:

(Sorry that I'm 4 years late XD)

MIDDLE SCHOOL

Which statements best describe medical uses for radioactive isotopes? Check all that apply. Radioactive isotopes are used to detect medical problems.
High-energy gamma rays are injected into the body.
Radioactive isotopes are used to treat some diseases.
Radiation is used to kill cancer cells.
Radioactive isotopes are directed at tumors from outside the body.

Answers

Explanation:

A radioactive isotope is defined as two or more chemical species of an element which has different atomic mass with unstable nuclei. As these isotopes emit excess of radiation in the form of alpha, beta and gamma rays.

For example, X-rays and gamma rays help in the use of medical diagnosis etc.

Therefore, we can conclude that the statements which best describe medical uses for radioactive isotopes are as follows.

  • Radioactive isotopes are used to detect medical problems.
  • Radioactive isotopes are used to treat some diseases.
  • Radiation is used to kill cancer cells.

A.radioactive isotopes are used to detect medical problems.

C.Radioactive isotopes are used to treat some diseases.

D.radiation is used to kill cancer cells.

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