Answer: N=2
Explanation:
We know that at the surface of the earth, value of g=
R
2
GM
At height h above the Earth's surface, the value of acceleration due to gravity g
′
=
(R+h)
2
GM
So it is given that g
′
=
4
g
When the bullet reaches maximum height, acceleration due to gravity is
4
1
th of that at planet's surface.
That implies
4R
2
GM
=
(R+h)
2
GM
→h=R
By conservation of mechanical energy,
R
−GMm
+
2
1
mv
2
=
h+R
−GMm
+0 since velocity is zero at max height. ⇒
2
1
mv
2
=
2R
GMm
v=
R
GM
=
2R
2GM
=
2
1
R
2GM
=
2
1
v
esc
⇒v
esc
=
2
v
⇒N=2
21. Magnetism is produced by the motion of electrons as they
a. move around the nucleus.
b. spin on their axes.
c. both A and B
d. none of the above
22. If you put a small compass in a magnetic field, the compass will
a. line up in a direction parallel to the magnetic field lines.
b. swing randomly.
c. line up in a direction perpendicular to the magnetic field lines.
d. seek electrical charge concentrations.
23. Magnetic field strength is
a. strongest close to a magnet.
b. constant everywhere around a magnet.
c. strongest far from a magnet.
24. Magnetic domains are
a. regions that may or may not be magnetized.
b. clusters of atoms randomly aligned.
c. regions of atoms magnetically aligned.
d. blocks of material.
25. Earth's magnetic field is most likely due to
a. millions of small magnets buried in Earth.
b. a magnetized solid inner core of Earth.
c. convection currents in the molten part of Earth's interior.
d. the rotation of Earth acting on all of Earth's electrons.
<h2>Answer:</h2>
<u>The correct option is </u><u> B.the empirical evidence that is collected during the experiment. </u>
<h2>Explanation:</h2>
A scientific experiment is the one that is not biased and it must be based upon actual data facts with the details dependent upon analysis and research. Empirical Evidence is that evidence is the information received by means of the senses, particularly by observation and documentation acquired through experimentation. Therefore B is the required answer.
Answer:
The product of mass times velocity for both objects is the same.
Explanation:
They both have the same velocity. False
They both have the same mass. False: Because two objects of different masses can have the same momentum. The least massive of the two objects will have the greatest kinetic energy.
The product of mass times velocity for both objects is the same. True: Same momentum means that the large mass must have a small velocity; therefore, their product is equal to the small mass times a large velocity.
Mass and velocity is the same for both. False: Based on what was stated for the second option.