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