Exam 9: Mass and Mass-Related Variables in Engineering

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The ratio of an object's weight to its volume is

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The physical quantity of momentum has

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The SI unit for specific weight is a. N/m3\mathrm { N } / \mathrm { m } ^ { 3 } b. lb/in3\mathrm { lb } / \mathrm { in } ^ { 3 } c. Newtons d. unitless

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D

The ratio of an object's volume to its mass is

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Momentum is a fundamental dimension.

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While filling up your car with gasoline, you notice that it takes 2 minutes to dispense 15 gallons of gasoline. What is the mass flow rate if water has a density of 1000kgm3 and gasoline Has a specific gravity of 0.72? a. 3.4 kg/sec3.4 \mathrm {~kg} / \mathrm { sec } b. 0.34 kg/sec0.34 \mathrm {~kg} / \mathrm { sec } c. 54kg/sec54 \mathrm { kg } / \mathrm { sec } d. 5400 kg/sec5400 \mathrm {~kg} / \mathrm { sec }

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The SI unit for specific gravity is a. g/cm3g / \mathrm { cm } ^ { 3 } b. g/mlg / \mathrm { ml } c. kg/m3k g / m ^ { 3 } d. unitless

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Which has the greater momentum: a motorcycle that weight 500 Newtons moving at a speed of 100 m/s\mathrm { m } / \mathrm { s } , or a bullet that weighs 5 millinewtons moving at a speed of 900 m/s.900 \mathrm {~m} / \mathrm { s } .

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It takes 20 seconds to fill a two-liter bottle with water from your kitchen faucet. What is the mass flow rate from the faucet if water has a density of 1000kg/m31000 { \mathrm { kg } } / \mathrm { m } ^ { 3 } ? a. 1kg/sec1 { \mathrm { kg } } / \mathrm { sec } b. 0.1kg/sec0.1 { \mathrm { kg } } / \mathrm { sec } c. 0.01kg/sec0.01 { \mathrm { kg } } / \mathrm { sec } d. 1 g/sec1 \mathrm {~g} / \mathrm { sec }

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A measure of how hard it is to rotate something with respect to its center of rotation is called

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The Earth has a mass of 5.98×1024 kg5.98 \times 10 ^ { 24 } \mathrm {~kg} and an average radius of 6.37×106 m6.37 \times 10 ^ { 6 } \mathrm {~m} . What is the density of the Earth? a. 3500kg/m33500 { \mathrm { kg } } / \mathrm { m } ^ { 3 } b. 5500kg/m35500 { \mathrm { kg } } / \mathrm { m } ^ { 3 } c. 7500kg/m37500 { \mathrm { kg } / \mathrm { m } ^ { 3 } } d. 10000kg/m310000 { \mathrm { kg } } / \mathrm { m } ^ { 3 }

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A block of unknown metal has the following dimensions: 1 cm×1 cm×3 cm1 \mathrm {~cm} \times 1 \mathrm {~cm} \times 3 \mathrm {~cm} . The block's density is 8000kg/m38000 { \mathrm { kg } } / \mathrm { m } ^ { 3 } . What is the mass of the block?

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Which of the following is the SI unit for mass?

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The ratio of an object's density to the density of water is

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Specific volume is a fundamental dimension.

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The ratio of an object's mass to its volume is

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Mass is a fundamental dimension.

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What happens to the mass of a marshmallow when you squeeze it?

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Specific weight is a fundamental dimension.

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What does I stand for in the following equation? I=r2dmI = \int r ^ { 2 } d m

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