College Physics with Mastering Physics

Physics & Astronomy

Quiz 1 :

Measurement and Problem Solving

Quiz 1 :

Measurement and Problem Solving

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A sailor tells you that if his ship is traveling at 25 knots (nautical miles per hour), it is moving faster than the 25 mi/h your car travels. How can that be
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The conversion formula of nautical miles to miles to solve this problem is as follows:
img The speed of the ship is 25 nautical miles per hour.
Now, convert this unit into miles per hour.
img Thus, in terms of miles/hour, the speed of the ship is 28.75 mi/h and this speed is greater than the speed of the car which is moving at 25 mi/h.
Hence, the statement of the sailor is true stating that his ship moving with speed 25 nautical miles per hour is greater than the car moving with speed 25 mi/h.

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Explain why a metric ton is equivalent to 1000 kg.
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The metric ton is not the unit of weight and is for the unit of mas. It is defined as the mass of 1.0 cubic meter of water.
One cubic centimetre is equal to one gram.
img img Hence the 1.0 metric ton is equal to 1000 kg.

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What replaced the original definition of the second and why Is the replacement still used
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A second is a basic time unit based in SI units.
A solar day is not the interval of time that elapses between two successive crossings of the same longitude line (meridian) by the Sun. A second was fixed as 1/86400 of this apparent solar day (1 day = 24h =1440min =86400s).
The mean solar day replaces the original second definition.
The mean solar day is the time which is calculated based on the crossing of sun across the meridian. This is the calculation of time with respect the position of sun in the sky. The mean solar day is defined as the period where the earth makes the rotation on the axis of earth. This is equal to 24 hours.
This replacement is not used now.
These are now replaced by atomic clocks. Because, 1 second is defined as the 9,192,631,770 cycles of a Cesium - 133 atomic clock.

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Give a couple of major differences between the SI and the British system.
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Why are there not more SI base emits
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Convert the following: (a) 40 000 000 bytes to MB, (b) 0.5722 mL to L, (c) 2.684 m to cm, and (d) 5 500 bucks to kilobucks.
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Why is weight not a base quantity
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If a fellow student tells you he saw a 3-cm-long ladybug, would you believe him How about another student saying she caught a 10-kg salmon
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Which of the following is the SI base emit for mass: pound, (b) gram, (c) kilogram, or (d) ton
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How many base units are there in the SI: (a) 3, (b) 5, (c) 7, or (d) 9
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(a) What volume in liters is a cube 20 cm on a side (b) If the cube is filled with water, what is the mass of the water
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The metric system is a decimal (base-10) system, and the British system is, in part, a duodecimal (base-12) system. Discuss the ramifications if our monetary system had a duodecimal base. What would be the possible values of our coins if this were the case
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Explain why 1 mL is equivalent to 1 cm 3.
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Which of the following is not related to a volume of water: (a) kilogram, (b) pound, (c) gram, or (d) tonne
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The prefix giga - means (a) 10 9 , (b) 10 9 , (c) 10 6 , (d) 10 6.
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The only SI standard represented by material standard or artifact is the (a) meter, (b) kilogram, (c) second, (d) electric charge.
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What size cube (in centimeters) would have a volume equal to that of a quart
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The prefix micro - means (a) 10 6 , (b) 10 6 , (c) 10 3 , (d) 10 3.
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A rectangular container measuring 25 cm × 35 cm × 55 cm is filled with water. What is the mass of this volume of water
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(a) In the British system, 16 oz = 1 pt and 16 oz = 1 lb. Is something wrong here Explain. Here's an old one: A pound of feathers weighs more than a pound of gold. How can that be [ Hint : Look up ounce in the dictionary.]
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