One mole of ammonia (NH3)has a mass of 17.0 g,and one mole is equal to 6.02 × 1023 molecules.How many hydrogen (H)atoms are in 55.0 g of ammonia? Note that each molecule of ammonia has 3 hydrogen atoms.

A) 5.84E+24 B) 1.95E+24 C) 3.07E+25 D) 6.49E+23 A) 5.84E+24 B) 1.95E+24 C) 3.07E+25 D) 6.49E+23

The basic function of an automobile's carburetor is to atomize the gasoline and mix it with air to promote rapid combustion.Assume that 30.0 cm3 of gasoline is atomized into N spherical droplets.Each droplet has a radius of 1.0 × 10−5 m.Find the total surface area of these N spherical droplets.

A) 3.0E+4 cm2 B) 1.2E+5 cm2 C) 1.8E+5 cm2 D) 9.0E+4 cm2 E) 1.1E+5 cm2 A) 3.0E+4 cm2 B) 1.2E+5 cm2 C) 1.8E+5 cm2 D) 9.0E+4 cm2 E) 1.1E+5 cm2

Calculate (0.83 + 0.049)(4.4 × 103),keeping only significant figures.

A) 3 900 B) 3 868 C) 3 886 D) 3 644 E) 4 000 A) 3 900 B) 3 868 C) 3 886 D) 3 644 E) 4 000

Exam 1: Units, Trigonometry, and Vectors

One mole of ammonia (NH₃)has a mass of 17.0 g,and one mole is equal to 6.02 × 10²³ molecules.How many hydrogen (H)atoms are in 55.0 g of ammonia? Note that each molecule of ammonia has 3 hydrogen atoms.

(Multiple Choice)

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Question 81

Two wires support a post,with dimensions as shown in the figure.If d = 14 m,what is the value of x?

(Multiple Choice)

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Question 82

The distance from New York to London is 3 470 miles.If a plane takes 6.0 hours to fly this distance,what is the plane's average speed in kilometers per hour? 1 mile = 1.609 km.

(Multiple Choice)

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Question 83

When we add a displacement vector to another displacement vector,the result is

(Multiple Choice)

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Question 84

An airplane takes off due west at an angle of 16.0° with the horizontal.When the airplane is at a vertical height of 400 ft,what is its displacement vector? Let east be the +x direction and +z be upwards.

(Multiple Choice)

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Question 85

Two ships set sail from the same port.Ship A sails a distance of 35.0 kilometers in a direction 30.0° north of east,and drops anchor.Ship B sails due south.When ship B is 30.0 km from the port,how far apart are the ships?

(Multiple Choice)

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Question 86

Arvin the Ant travels 30 cm eastward,then 25 cm northward,and finally 10 cm westward.In what direction is Arvin now in with respect to his starting point?

(Multiple Choice)

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Question 87

A surveyor stands 100 m from the base of a building,and uses a transit to determine that the angle of elevation to the building's roof is 19.0°.If the transit height is 0.80 m,what is the height of the building?

(Multiple Choice)

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Question 88

Of vectors with lengths 5 m,3 m,and 4 m,which has the greatest magnitude x component?

(Multiple Choice)

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Question 89

A marble has a radius of 16 mm.Approximately how many marbles will fit in a cube-shaped container with each side equal to 36 cm?

(Multiple Choice)

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Question 90

The basic function of an automobile's carburetor is to atomize the gasoline and mix it with air to promote rapid combustion.Assume that 30.0 cm³ of gasoline is atomized into N spherical droplets.Each droplet has a radius of 1.0 × 10−⁵ m.Find the total surface area of these N spherical droplets.

(Multiple Choice)

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Question 91

Multiplying a 2-significant-figure number by a 4-significant-figure number and then dividing the product by a seven-significant-figure number yields a number with how many significant figures?

(Multiple Choice)

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Question 92

When we subtract a velocity vector from another velocity vector,the result is

(Multiple Choice)

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Question 93

How long has it been that scientists have accepted that the nucleus of the atom consists of neutrons and protons? Think of your answers in terms of order of magnitude.

(Multiple Choice)

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Question 94

When three vectors are added graphically and form a closed triangle,the largest enclosed angle between any two of the vectors cannot be greater than

(Multiple Choice)

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Question 95

I walk six miles in a straight line in a direction north of east,and I end up four miles north and several miles east.How many degrees north of east have I walked?

(Multiple Choice)

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Question 96

Calculate (0.83 + 0.049)(4.4 × 10³),keeping only significant figures.

(Multiple Choice)

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Question 97

A cement truck can pour 160 cubic yards of cement per hour.Express this in ft³/min.

(Multiple Choice)

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Question 98

On planet Q the standard unit of volume is called the guppy.Space travelers from Earth have determined that one liter = 39.0 guppies.How many guppies are in 230 liters?

(Multiple Choice)

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Question 99

Sphere A has a radius of 5.00 cm,and sphere B has a radius of 8.80 cm.What is the difference in volume between the two spheres?

(Multiple Choice)

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Question 100

Showing 81 - 100 of 100

Exam 1: Units, Trigonometry, and Vectors

One mole of ammonia (NH3)has a mass of 17.0 g,and one mole is equal to 6.02 × 1023 molecules.How many hydrogen (H)atoms are in 55.0 g of ammonia? Note that each molecule of ammonia has 3 hydrogen atoms.

Two wires support a post,with dimensions as shown in the figure.If d = 14 m,what is the value of x?

​The distance from New York to London is 3 470 miles.If a plane takes 6.0 hours to fly this distance,what is the plane's average speed in kilometers per hour? 1 mile = 1.609 km.

When we add a displacement vector to another displacement vector,the result is

​An airplane takes off due west at an angle of 16.0° with the horizontal.When the airplane is at a vertical height of 400 ft,what is its displacement vector? Let east be the +x direction and +z be upwards.

Two ships set sail from the same port.Ship A sails a distance of 35.0 kilometers in a direction 30.0° north of east,and drops anchor.Ship B sails due south.When ship B is 30.0 km from the port,how far apart are the ships?

Arvin the Ant travels 30 cm eastward,then 25 cm northward,and finally 10 cm westward.In what direction is Arvin now in with respect to his starting point?

​A surveyor stands 100 m from the base of a building,and uses a transit to determine that the angle of elevation to the building's roof is 19.0°.If the transit height is 0.80 m,what is the height of the building?

Of vectors with lengths 5 m,3 m,and 4 m,which has the greatest magnitude x component?

​A marble has a radius of 16 mm.Approximately how many marbles will fit in a cube-shaped container with each side equal to 36 cm?

Multiplying a 2-significant-figure number by a 4-significant-figure number and then dividing the product by a seven-significant-figure number yields a number with how many significant figures?

When we subtract a velocity vector from another velocity vector,the result is

How long has it been that scientists have accepted that the nucleus of the atom consists of neutrons and protons? Think of your answers in terms of order of magnitude.

When three vectors are added graphically and form a closed triangle,the largest enclosed angle between any two of the vectors cannot be greater than

I walk six miles in a straight line in a direction north of east,and I end up four miles north and several miles east.How many degrees north of east have I walked?

Calculate (0.83 + 0.049)(4.4 × 103),keeping only significant figures.

A cement truck can pour 160 cubic yards of cement per hour.Express this in ft3/min.

On planet Q the standard unit of volume is called the guppy.Space travelers from Earth have determined that one liter = 39.0 guppies.How many guppies are in 230 liters?​

Sphere A has a radius of 5.00 cm,and sphere B has a radius of 8.80 cm.What is the difference in volume between the two spheres? ​

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One mole of ammonia (NH₃)has a mass of 17.0 g,and one mole is equal to 6.02 × 10²³ molecules.How many hydrogen (H)atoms are in 55.0 g of ammonia? Note that each molecule of ammonia has 3 hydrogen atoms.

The distance from New York to London is 3 470 miles.If a plane takes 6.0 hours to fly this distance,what is the plane's average speed in kilometers per hour? 1 mile = 1.609 km.

An airplane takes off due west at an angle of 16.0° with the horizontal.When the airplane is at a vertical height of 400 ft,what is its displacement vector? Let east be the +x direction and +z be upwards.

A surveyor stands 100 m from the base of a building,and uses a transit to determine that the angle of elevation to the building's roof is 19.0°.If the transit height is 0.80 m,what is the height of the building?

A marble has a radius of 16 mm.Approximately how many marbles will fit in a cube-shaped container with each side equal to 36 cm?

Calculate (0.83 + 0.049)(4.4 × 10³),keeping only significant figures.

A cement truck can pour 160 cubic yards of cement per hour.Express this in ft³/min.

On planet Q the standard unit of volume is called the guppy.Space travelers from Earth have determined that one liter = 39.0 guppies.How many guppies are in 230 liters?

Sphere A has a radius of 5.00 cm,and sphere B has a radius of 8.80 cm.What is the difference in volume between the two spheres?