Physics test 1

A nanosecond is?

B. 10−9 s

(5.0×104)×(3.0×106)

C. 1.5×101

Which of the following is closest to a yard in length?

C. 1m

1 mi is equivalent to 1609 m so 55 mph is

B. 25 m/s

1.513 + 27.3=

B. 28.8

The number of significant figures in 0.00150 is:

B. 3

A car starts from Hither, goes 50 km in a straight line to Yon, immediately turns around, and returns to Hither. The time for this round trip is 2 hours. The average speed of the car for this round trip is:

B. 50 km/h

1 m is equivalent to 3.281 ft. A cube with an edge of 1.5 ft has a volume of

B. 9.6×10−2 m

The average speed of a moving object during a given interval of time is always:

B. the distance covered during the time interval divided by the time interval

A particle moves along the x axis from xi to xf. Of the following values of the initial and final coordinates, which results in a negative displacement?

B. xi = −4m,xf = −8m

The number of significant figures in 15.0 is:

C. 3

A sphere with a radius of 1.7 cm has a surface area of:

C. 3.6×10−3 m2

3.2×2.7=

C. 8.6

The SI base unit for mass is

C. kilogram

In 1866, the U. S. Congress defined the U. S. yard as exactly 3600/3937 international meter. This was done primarily because:

C. this definition relates the common U. S. length units to a more widely used system

Two automobiles are 150 kilometers apart and traveling toward each other. One automobile is moving at 60km/h and the other is moving at 40km/h mph. In how many hours will they meet?

D. 1.5

Suppose A = BnCm, where A has dimensions LT, B has dimensions L2T−1, and C has dimensions LT2. Then the exponents n and m have the values:

D. 1/5; 3/5

A right circular cylinder with a radius of 2.3 cm and a height of 1.4 m has a volume of:

D. 2.3×10−3 m3

A right circular cylinder with a radius of 2.3 cm and a height of 1.4 cm has a total surface area of:

D. 5.3×10−3 m

Which of the following weighs about a pound?

D. 50 kg

A car travels 40 kilometers at an average speed of 80km/h and then travels 40 kilometers at an average speed of 40km/h. The average speed of the car for this 80-km trip is:

D. 53km/h

There is no SI base unit for area because:

D. area can be expressed in terms of square meters

During a short interval of time the speed v in m/s of an automobile is given by v = at2 + bt3, where the time t is in seconds. The units of a and b are respectively:

D. m/s3;m /s4

A car starts from Hither, goes 50 km in a straight line to Yon, immediately turns around, and returns to Hither. The time for this round trip is 2 hours. The magnitude of the average velocity of the car for this round trip is:

A. 0

A sphere with a radius of 1.7 cm has a volume of:

A. 2.1×10−5 m3

Suppose A = BC, where A has the dimension L/M and C has the dimension L/T. Then B has the dimension:

A. T/M

The coordinate of a particle in meters is given by x(t) = 16 t − 3.0t3, where the time t is inseconds. The particle is momentarily at rest at t =

B. 1.3s

(5.0×104)×(3.0×10−6)=

B. 1.5×10−1

A gram is

B. 10−3 k

A square with an edge of exactly 1 cm has an area of:

B. 10−4 m2

A cubic box with an edge of exactly 1 cm has a volume of

B. 10−6 m3

A drag racing car starts from rest at t = 0 and moves along a straight line with velocity given by v = bt2, where b is a constant. The expression for the distance traveled by this car from its position at t = 0 is

B. bt3/3

The SI standard of time is based on: A. the daily rotation of the earth B. the frequency of light emitted by Kr86 C. the yearly revolution of the earth about the sun D. a precision pendulum clock E. none of these

E.

5.0×105 +3 .0×106 =

E. 3.5×10

(7.0×106)/(2.0×10−6)=

E. 3.5×1012

The SI standard of length is based on:

E. the speed of light

A particle moves along the x axis from xi to xf. Of the following values of the initial and final coordinates, which results in the displacement with the largest magnitude?

E. xi = −4m,xf =4m