Very short stions . (a) What is the change in position of a body with respect to time called? (b) What is the another name for sand clock? (c) What is the small metallic ball of simple pendulum called? (d) What is the SI unit of time? (e) Which device is used to measure distance in a car? Short answer type questions.
Answers
Ans (a)Change in position of a body with time is called motion
Ans(b)An hourglass (or sandglass, sand timer, sand clock or egg timer) is a device used to measure the passage of time
Answer:
a)motion, in physics, change with time of the position or orientation of a body. Motion along a line or a curve is called translation
b) An hourglass (or sandglass, sand timer, sand clock or egg timer) is a device used to measure the passage of time. It comprises two glass bulbs connected vertically by a narrow neck that allows a regulated flow of a substance (historically sand) from the upper bulb to the lower one.
c) Bob : A simple pendulum consists of a small metallic ball or a piece of stone suspended from a rigid stand by a thread called the bob of the pendulum
d)The second, symbol s, is the SI unit of time. It is defined by taking the fixed numerical value of the cesium frequency ΔνCs, the unperturbed ground-state hyperfine transition frequency of the cesium 133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s-1.
e)odometer
speedometer, instrument that indicates the speed of a vehicle, usually combined with a device known as an odometer that records the distance traveled
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