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Vilka [71]
3 years ago
8

3 PHYSICAL SCIENCE: In order to figure out what is in a sealed box, you perform some tests. The box seems heavy for its size and

is harder to remove from a steel table than when placed on a concrete floor. What kind of object could be inside the box?"
Physics
1 answer:
rjkz [21]3 years ago
7 0
Some sort of magnetic metal

Metals are heavier per cubic unit than other materials such as air or water, and also are much more magnetic than other materials
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A constant current of I = 15 A exists in a solenoid whose inductance is L = 2.8 H. The current is then reduced to zero in a cert
julia-pushkina [17]

Answer:

Explanation:

Given that

Constant current I=15A

Inductance L=2.8H

a. Current changes from 15A to 0A.

∆I=0-15=-15

For a time of t=75ms=0.075s

EMF=?

EMF is given at

EMF=-L(∆I/t)

EMF=-2.8×-15/0.075

EMF=3.15V

b. Energy stored?

Energy stored is given as

E=½LI²

E=½×2.8×15²

E=315 J

c. Rate of energy? Which is power and the rate of energy is given as

Power=Energy/timetaken

Power=315/0.075

Power=4200W

P=4.2KW

7 0
3 years ago
The figure shows an uncharged conducting cubic shell and a positive point charge Q outside the shell. There are two lettered poi
Nataliya [291]

If the point charge is placed at point E_W is equal to E_X.

<h3>Electric field inside a conducting cubic shell</h3>

The electric field inside a conducting cubic shell is zero. When a point charge is placed outside the shell, the electric field outside the shell is greater than the electric field inside the shell which is zero.

We can deduce the following;

  • Electric field inside the shell is zero, thus E_W = E_X =0
  • Electric field outside the shell is greater than electric field inside the shell

Thus, the only correct statement is, If the point charge is placed at point E_W is equal to E_X.

Learn more about electric field inside a shell here: brainly.com/question/539905

4 0
2 years ago
How can speed be defined
Anna11 [10]

Explanation:

C) distance / time

.......

6 0
2 years ago
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Natalija [7]

Answer:

option (i) is correct

Explanation:

as there is no air resistance, no force is acting on the object horizontally, but gravitational acceleration will obviously act, regardless of the air resistance... option (i) is correct

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3 years ago
The Solar System is made up of eight planets, numerous comets, asteroids, and moons, and the Sun. The force that holds all of th
Marrrta [24]
Your Question:
<span>The Solar System is made up of eight planets, numerous comets, asteroids, and moons, and the Sun. The force that holds all of these objects together is _______.
A.
magnetism
B.
tension
C.
electromagnetic attraction
D.
gravity </span>
Our Teams Answer:

the force is gravity holding them


Our Teams aim's to please and We are happy to help! Its the answer is wrong please notify us quickly for we can fix it quickly! Thanks :)

-ExperimentsDIY


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3 years ago
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