1. Define the following terms giving appropriate examples. (4mks)

1 answer:

4 0

Answer: Those materials which are not attracted by a magnet are called non- magnetic materials. All the substances other than iron, nickel, and Cobalt are non-magnetic substances for example plastic, rubber, water, etc are nonmagnetic materials. Non-magnetic substances cannot be magnetized.

Explanation: The materials which get attracted towards a magnet are magnetic – for example, iron, nickel or cobalt. The materials which are not attracted towards a magnet are non-magnetic materials. Examples of non-magnetic materials include rubber, coins, feather and leather.

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Explain why it is not possible to determine the type of an atom by simply knowing how many neutrons it has.

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Answer:

Explanation:

There are isotopes, which are the same atom, but different number of neutrons, so only neutrons cannot determine the atom

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The formula d = rt gives the distance d traveled in time t at rate r. A train travels 163.2 miles in 2.4 hours, traveling at a c

Alex17521 [72]

Since d= 163.2 and t = 2.4, we divide 163.2 by 2.4 to get 68 miles per hour.

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A simple pendulum has a bob of mass M. The bob is on a light string of length . The string is fixed at C. At position A, the str

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Answer:

$v=\sqrt{2gL}$

Explanation:

mass of bob = M

string is fixed at C, at position A the string is horizontal and at position B teh string is vertical.

Let the length of the string is L.

At the point C, it has maximum potential energy which is equal to

U = M x g x L ..... (1)

At the position B, it has maximum kinetic energy and the velocity is v.

K = 1/2 Mv² ...... (2)

According to the conservation of energy

The potential energy at the position A is equal to the kinetic energy at position B.

M x g x L = 1/2 M x v²

v² = 2 x g x L

$v=\sqrt{2gL}$

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An effort of 200 N is used to lift a load of 800 N by using a lever. If the load is at a distance of 40 cm from the fulcrum then

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The effort distance will be 160 cm.Applying the moment at the center as follows will provide the effort distance:

<h3 /><h3>What is the mechanical advantage?</h3>

Mechanical advantage is a measure of the ratio of output force to input force in a system, it is used to obtain the efficiency of forces in levers and pulleys.

Given data;

Effort, $\rm F_e=00 N$