Test 1 Chapter 1 and 2

its speed on returning to its starting point is the same as its initial speed

An object is thrown vertically upward. Which of the following statements is true?

80 kg

Approximately what is the mass of the average adult in kilograms? Something that weighs 1 pound has a mass of about 1/2kg.

all of the preceding

Both sides of an equation are equal in Both sides of an equation are equal in units. numerical value. dimensions. all of the preceding.

greater than

Statement A: 2.567 km, to two significant figures. Statement B: 2.567 km, to three significant figures. Determine the correct relationship between the statements. Statement A is _________ Statement B

v = 341.092 s = 0.268

Driving a jet-powered car, Royal Air Force pilot Andy Green broke the sound barrier on land for the first time and achieved a record land speed of more than 763 mi/h in Black Rock Desert, Nevada, on October 15, 1997. What is this speed expressed in m/s? How long would it take the jet-powered car to travel the length of a 300-ft football field at this speed? (Hint: v=d/t.)

97.0 cm

How many centimeters are there in a length 38.2 inches ? Express your answer in centimeters to three significant figures.

10^3 (1000)

How many millimeters are there in one meter?

0.21 m^2

In the calculation of the area of a rectangle with dimensions of 4.282 m by 0.050 m, which of the following answers has the correct number of significant figures? 0.2 m2 0.2141 m2 0.214 m2 0.21 m2

a curve

On a position-versus-time plot for an object that has a constant acceleration, the graph is

The truck travels twice as far as the car.

On a straight road, a car speeds up at a constant rate from rest to 20 m/s over a 5 second interval and a truck slows at a constant rate from 20 m/s to a complete stop over a 10 second interval. How does the distance traveled by the truck compare to that of the car?

a, k = 5.1,-1

A number written in scientific notation has the form a×10k, where 1≤a<10 and k is an integer, that is, k is one of ...−3,−2,−1,0,1,2,3.... Determine the values of a and k when 0.51 is written in scientific notation.

a, k = 2.9979, 8

A number written in scientific notation has the form a×10k, where 1≤a<10 and k is an integer, that is, k is one of ...−3,−2,−1,0,1,2,3.... Determine the values of a and k when 299,790,000 is written in scientific notation.

1 hour equals 3600 seconds

A leaky faucet drips once each second. At this rate, it takes 1 hour to fill a 1-liter graduated cylinder to the 200-cm^3 mark. What unit conversion do you need in order to calculate the average volume of a single drop in cm^3?

a, k = 4.4,3

A number written in scientific notation has the form a×10k, where 1≤a<10 and k is an integer, that is, k is one of ...−3,−2,−1,0,1,2,3.... Now consider the expression 4.0×103+4×102. Determine the values of a and k when the value of this expression is written in scientific notation.

a, k = 9.78,0

Finally, consider the expression (6.67×10−11)(5.97×1024)(6.38×106)2. Determine the values of a and k when the value of this expression is written in scientific notation.

kg⋅m2 / s2

One consequence of Einstein's theory of special relativity is that mass is a form of energy. This mass-energy relationship is perhaps the most famous of all physics equations: E=mc2, where m is mass, c is the speed of the light, and E is the energy. In SI units, the units of speed are m/s. For the preceding equation to have consistent units (the same units on both sides of the equation), the units of E must be which of the following? kg⋅m / s kg⋅m2 / s2 kg⋅s2 / m2 kg⋅m2 / s

The rock has a downward acceleration of 9.8 m/s2.

Suppose that you toss a rock upward so that it rises and then falls back to the earth. If the acceleration due to gravity is 9.8 m/sec2, what is the rock's acceleration at the instant that it reaches the top of its trajectory (where its velocity is momentarily zero)? Assume that air resistance is negligible.

kilogram (kg)

The SI base unit for mass is the _______.

kg⋅m / s2

The SI unit of force is, appropriately, called the newton (N). What are the units of the newton in terms of base quantities?

33.3

The body mass index (BMI) is a measure of relative size commonly used to assess how much one's body weight differs from what is healthy or desirable. BMI = mass/(height)2 in SI units. What is the BMI of a 65.0 inch tall man with a weight of 200 lbs?

6.38 × 10^8 cm

The radius of the earth is 6,380 kilometers. What is the radius of the earth in centimeters?

Average acceleration is always equal to the change in velocity of an object divided by the time interval.

Which of the following best describes how to calculate the average acceleration of any object?

128.0

Which of the following has the greatest number of significant figures? Which of the following has the greatest number of significant figures? 128.0 747 2.2×10^12 9.81

Displacement

Which of the following is a vector? Which of the following is a vector? Temperature Displacement Speed Mass Distance

has an increase in speed of 9.8 m/s each second

A dropped object in free fall

either an increase in speed or a decrease in speed

A negative acceleration can cause

A scalar is specified with a single number, but a vector is specified using both a magnitude and a direction.

In the study of physics, what distinguishes a scalar from a vector?

a curve

For a constant linear acceleration, the position-versus-time graph would be

m^3 / kg⋅s2

Gravity causes objects to be attracted to one another. This attraction keeps our feet firmly planted on the ground and causes the moon to orbit the earth. The force of gravitational attraction is represented by the equation F=Gm1m2r2, where F is the magnitude of the gravitational attraction on either body, m1 and m2 are the masses of the bodies, r is the distance between them, and G is the gravitational constant. In SI units, the units of force are kg⋅m/s2, the units of mass are kg, and the units of distance are m. For this equation to have consistent units, the units of G must be which of the following? kg3 / m⋅s2 kg⋅s2 / m3 m3/ kg⋅s2 m / kg⋅s2

equal to

Statement A: (2.567 km + 3.146 km), to two significant figures. Statement B: (2.567 km, to two significant figures) + (3.146 km, to two significant figures). Determine the correct relationship between the statements. Statement A is _________ Statement B

greater than

Statement A: Area of a rectangle with measured length = 2.536 m and width = 1.4 m. Statement B: Area of a rectangle with measured length = 2.536 m and width = 1.41 m. Since you are not told specific numbers of significant figures to round to, you must use the rules for multiplying numbers while respecting significant figures. If you need a reminder, consult the hint. Determine the correct relationship between the statements. Statement A is ______ Statement B

3.38 miles

Suppose that a particular artillery piece has a range R = 5940 yards . Find its range in miles. Use the facts that 1mile=5280ft and 3ft=1yard. Express your answer in miles to three significant figures.

1 in^3 / (2.54)^3 cm^3

The motorcycle engine on a Kawasaki Ninja 1000 has a displacement of 1043 cubic-centimeters (cm3). In order to calculate its engine displacement in cubic-inches (in3) what unit conversion factor would you use to multiply the given displacement?

all of the above

To eight significant figures, Avogadro's constant is 6.0221367×1023mol−1. Which of the following choices demonstrates correct rounding? Check all that apply. 6.022×1023mol−1 6.0×1023mol−1 6.02214×1023mol−1

1.67 * 10 ^-27

To seven significant figures, the mass of a proton is 1.672623×10−27kg. Which of the following choices demonstrates correct rounding? Check all that apply. Check all that apply. 1.672×10^−27kg 1.67×10^−27kg 1.67263×10^−27kg

either greater than or equal to

What can be said about average speed relative to the magnitude of the average velocity?

200 cm

What is the approximate height of the average adult in centimeters?The distance from your elbow to your fingertips is typically about 50 cm

v = 0.4469 m/s

What is the speed of a car going v=1.000mph in SI units? Notice that you will need to change from miles to meters and from hours to seconds. You can do each conversion separately. Use the facts that 1mile=1609m and 1hour=3600s. Express your answer in meters per second to four significant figures.

The position versus time graph is parabolic.

What shape do we expect for a graph showing the position of a motorcycle versus time if the motorcycle is speeding up with a constant acceleration? The position versus time graph is a horizontal line. The position versus time graph is a line with a negative slope. The position versus time graph is parabolic. The position versus time graph is a line with a positive slope.

size = 3.94 inches

What size cube (in inches) would have a volume equal to that of a liter?

The meter is defined as the distance that light travels in a specified time interval.

Which of the following is the basis of the current standard for the meter? The meter is defined as the length of a strand of carbon fiber that consists of a specified number of carbon-12 atoms. The meter is defined as a specified number of wavelengths of the orange-red light emitted by krypton-86. The meter is defined in terms of the standard inch so that 2.54 cm is exactly 1 inch. The meter is defined as the distance between precise scratch marks on a certain platinum-iridium bar that is kept under specified conditions. The meter is defined as the distance that light travels in a specified time interval.