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Fill in the blanks:

i) The standard of mass is a cylinder of 1 kg mass made of ______ alloy.

ii) ______ is the magnitude of velocity.

iii) 10 ns is equal to ______.

iv) If the velocity is constant, the ______ is zero.

v) The slope of a distance-time graph gives the ______ of a moving object.

vi) Newton's first law expresses the idea of ______.

vii) 1 km is equal to ______ cm.

Choose the correct answers from the following:

Sagot :

GinnyAnsweridn
Certainly! Let's go through each part and fill in the blanks step-by-step.

i) The standard of mass is a cylinder of 1 kg mass made of platinum-iridium alloy.

Explanation: The standard of mass, known as the international prototype kilogram (IPK), is a cylinder of 1 kg mass made of a platinum-iridium alloy.

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ii) Speed is the magnitude of velocity.

Explanation: Speed refers to how fast an object is moving and is the scalar quantity of velocity, which includes both speed and direction.

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iii) 10 ns is equal to 1e-08 seconds.

Explanation: The conversion for time from nanoseconds (ns) to seconds is done by multiplying it with [tex]\( 10^{-9} \)[/tex]. Hence, 10 ns equals [tex]\( 10 \times 10^{-9} \)[/tex] seconds or [tex]\( 1 \times 10^{-8} \)[/tex] seconds.

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iv) If the velocity is constant, the acceleration is zero.

Explanation: Acceleration is defined as the rate of change of velocity. If the velocity is constant, there is no change in velocity, and thus the acceleration is zero.

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v) The slope of the distance - time graph gives the speed of the motion object.

Explanation: On a distance-time graph, the slope (change in distance divided by change in time) represents the speed of the object.

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vi) Newton's first law expresses the idea of inertia.

Explanation: Newton's first law, often called the law of inertia, states that an object will remain at rest or in uniform motion unless acted upon by an external force.

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vii) 1 km is equal to 100000 cm.

Explanation: To convert kilometers to centimeters, multiply by the conversion factor [tex]\( 10^5 \)[/tex], since 1 kilometer is equal to 1000 meters and each meter is 100 centimeters. Therefore, 1 km equals [tex]\( 1000 \times 100 = 100000 \)[/tex] cm.

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Here is the completed set of answers with the corresponding explanations for clarity:

i) The standard of mass is a cylinder of 1 kg mass made of platinum-iridium alloy.
ii) Speed is the magnitude of velocity.
iii) 10 ns is equal to 1e-08 seconds.
iv) If the velocity is constant, the acceleration is zero.
v) The slope of the distance - time graph gives the speed of motion object.
vi) Newton's first law expresses the idea of inertia.
vii) 1 km is equal to 100000 cm.
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