PHYSICS HIGH SCHOOL

A solid magnesium flare has a mass of 1300 g and a volume of 743 cm3 what is the density of the magnesium

Answers

Answer 1

Answer:

Answer:

$density = 1.75 g/cm^3$

Explanation:

As we know that the mass of the magnesium is given as

mass = 1300 g

volume of the magnesium is

volume = 743 cubic cm

so we will have

$density = (mass)/(volume)$

so we will have

$density = (1300)/(743)$

$density = 1.75 g/cm^3$

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You're caring for three children in your home: a three-year-old, a four-year-old, and a two-month-old infant. The infant often becomes hungry and wants to be fed just when you're involved in something with the two older children. What should you do with the infant? A. Put the infant in a location so he or she can watch you and the other two children; then feed the infant when you're through.
B. Hold and feed the infant while you supervise the activity of the older children.
C. Have the older two children continue the project on their own while you feed the infant in a separate room.
D. Prop the infant's bottle in the crib so he or she can eat while you continue to help the older children

Answers

Answer: B. Hold and feed the infant while you supervise the activity of the older children.

Explanation: On one side, a two-month-old is too young to understand that he has to wait until you finish with your other activities so you are free to feed him. His needs are urgent. Of course he is also too young to take the bottle on his own. These are the reason why options A and D are incorrect. On the other side, the other two children also need your supervision. You have to take care of them and leave them alone is not a good option. This is why option C is incorrect. Taking all these things into account I find option B as the best answer.

B i belive, :) :) :) ..

If (on earth) an object falls 18m and loses 36J of GPE. What is the objects mass?

Answers

The gravitational potential energy of the object falling from 18 m height is 36 J. Thus, its mass is 0.2 Kg.

What is gravitational potential energy?

Gravitational potential energy of an object is the energy generated by virtue of its position in a gravitational field. The magnitude of gravitational potential energy is directly proportional to the mass of the object , height from the surface and the acceleration due to gravity.

GPE = mgh

The height of the object falling = 18 m

Gravitational potential energy = 36 J

Acceleration due to gravity in earth = 9.8 m/s².

Mass of the object = GPE/ (gh)

= 36 J/ (18 m×9.8 m/s² )

= 0.20 Kg.

Therefore, the mass of the object is 0.20 Kg.

To find more on gravitational potential energy, refer here:

brainly.com/question/19768887

#SPJ2

PE=mgh
Where 'g' is the gravitational constant (9.81 m/s^2)
If you're solving for m, you can change the equation to be (PE/gh)=m.
m=(36J/18m*9.81m/s^2)
m=.2kg

The distance-time graph for a vehicle standing on a road side will be

Answers

Answer:

Explanation:

could you please upload ur image

A comet is in an elliptical orbit around the Sun. Its closest approach to the Sun is a distance of 4.7 1010 m (inside the orbit of Mercury), at which point its speed is 9.5 104 m/s. Its farthest distance from the Sun is far beyond the orbit of Pluto. What is its speed when it is 6 1012 m from the Sun? (This is the approximate distance of Pluto from the Sun.)

Answers

Answer:

58515.9 m/s

Explanation:

We are given that

$d_1=4.7* 10^(10) m$

$v_i=9.5* 10^4 m/s$

$d_2=6* 10^(12) m$

We have to find the speed (vf).

Work done by surrounding particles=W=0 Therefore, initial energy is equal to final energy.

$K_i+U_i=K_f+U_f$

$(1)/(2)mv^2_i-(GmM)/(d_1)=(1)/(2)mv^2_f-(GmM)/(d_2)$

$(1)/(2)v^2_i-(GM)/(d_1)+(GM)/(d_2)=(1)/(2)v^2_f$

$v^2_f=2((1)/(2)v^2_i-(GM)/(d_1)+(GM)/(d_2))$

$v_f=\sqrt{2((1)/(2)v^2_i-(GM)/(d_1)+(GM)/(d_2))}$

Using the formula

$v_f=\sqrt{v^2_i+2GM((1)/(d_2)-(1)/(d_1))}$

$v_f=\sqrt{(9.5* 10^4)^2+2* 6.7* 10^(-11)* 1.98* 10^(30)((1)/(6* 10^(12))-(1)/(4.7* 10^(10)))$

Where mass of sun= $M=1.98* 10^(30) kg$

$G=6.7* 10^(-11)$

$v_f=58515.9 m/s$

A charge of 0.2 C experiences an electric force of 5 N. What is the strength of the electric field in N/C?

Answers

YOUR ANSWER SHOULD BE AS FOLLOWS

25N/C

$\vec{E}=\frac{\vec{F}}{q}\n \n \vec{E}=(5 \ N)/(0.2 \ C)=25 \ N/C$

Which of these are considered an oxidizing mutagenic agent?a. x-rays
b. benzopyrene
c. gamma rays

Answers

X - rays are considered an oxidizing mutagenic agent. The answer is letter A. X-rays are high energy electrons that can cause damage when exposed under extreme conditions. The best technology that can block it is t using a lightweight type of metal foam. It can take in high energy collisions which also exhibits high forces. it does not only block x-rays but also, neutron radiation and gamma rays.

Answer: X-rays is what's considered an oxidizing mutagenic agent

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