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SIZIF [17.4K]
3 years ago
9

How can we magnitise and demagnitise a magnet at the same time

Physics
2 answers:
LekaFEV [45]3 years ago
6 0

Explanation:

Demagnetize a Magnet by Heating or Hammering

You can get the same effect by repeatedly hammering a magnet, applying pressure, or dropping it on a hard surface. The physical disruption and vibration shake the order out of the material, demagnetizing it.

damaskus [11]3 years ago
5 0

Answer:

To develop a molecular clock, you need to find which of the following?

a sequence of molecules

the rate at which changes occur in a type of molecule

how much total change has occurred in a type of molecule from two different species

how many molecules a species has

Explanation:

s;s;

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What is 28 degrees Celsius converted to Fahrenheit?
torisob [31]
28 degrees celsius converts to 82.4 degrees in Fahrenheit :) 
3 0
3 years ago
Read 2 more answers
A model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 85.0 m/s2
sergey [27]

Answer:

Maximum height attained by the model rocket is 2172.87 m

Explanation:

Given,

  • Initial speed of the model rocket = u = 0
  • acceleration of the model rocket = a\ =\ 85.0 m/s^2
  • time during the acceleration = t = 2.30 s

We have to consider the whole motion into two parts

In first part the rocket is moving with an acceleration of a = 85.0 m/s^2 for the time t = 2.30 s before the fuel abruptly runs out.

Let s_1 be the height attained by the rocket during this time intervel,

s_1\ =\ ut\ +\ \dfrac{1}{2}at^2\\\Rightarrow s_1\ =\ 0\ +\ 0.5\times 85\times 2.30^2\\\Rightarrow s_1\ =\ 224.825\ m

And Final velocity at that point be v

\therefore v\ =\ u\ +\ at\\\Rightarrow v\ =\ 0\ +\ 85.0\times 2.3\\\Rightarrow v\ =\ 195.5\ m/s.

Now, in second part, after reaching the altitude of 224.825 m the fuel abruptly runs out. Therefore rocket is moving upward under the effect of gravitational acceleration,

Let 's_2' be the altitude attained by the rocket to reach at the maximum point after the rocket's fuel runs out,

At that insitant,

  • initial velocity of the rocket = v = 195.5 m/s.
  • a = -g\ =\ -9.81\ m/s^2
  • Final velocity of the rocket at the maximum altitude = v_f\ =\ 0

From the kinematics,

v^2\ =\ u^2\ +\ 2as\\\Rightarrow 0\ =\ u^2\ -\ 2gs_2\\\Rightarrow s_2\ =\ \dfrac{u^2}{2g}\\\Rightarrow s_2\ =\ \dfrac{195.5^2}{2\times 9.81}\\\Rightarrow s_2\ =\ 1948.02\ m

Hence the maximum altitude attained by the rocket from the ground is

s\ =\ s_1\ +\ s_2\ =\ 224.85\ +\ 1948.02\ =\ 2172.87\ m

6 0
3 years ago
Calculate the weight of each of the following masses on earth. Show working
padilas [110]
W=mg

a. W=0.01*9.81=0.0981N
b. W=3.6*9.81=35.316N
c.W=0.713*9.81=6.99453N
6 0
2 years ago
If the relative density of a metal is 19,what will be the mass of 20cm of the metal when immersed in water?
Lady_Fox [76]

Answer:

The mass of 20 cm of the metal is 360 grams.

Explanation:

Relative density or specific gravity is the ratio of the density of a substance to the density of a standard; usually water for a liquid or solid, and air for a gas. It has no units.  

Given, relative density of a metal is 19 and volume of the metal is 20 cm.  

We know that, Mass= Volume X Density. So, mass is 19 X 20= 380 grams.  

So, weight in water = true weight- upthrust

Desired answer is 380- 20 X 1= 360 grams.

3 0
3 years ago
Question 2
FromTheMoon [43]

Answer:

C

Explanation:

When the frequency of sound changes, we hear a change in pitch. When the frequency of light changes we see a change in color.

5 0
3 years ago
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