Physics1: Chapter 1 & 2

What condition must apply to a system's state of motion for it to be regarded as an inertial frame of reference? (a) in decreasing velocity (b) in constant velocity (c) in constant acceleration (d) in increasing acceleration

(b) in constant velocity

The prefixes which are abbreviated p, n, and G represent which of the following? (a) 10^-2, 10^-6, and 10^15 (b) 10^-9, 10^6, and 10^10 (c) 10^-12, 10^-9, and 10^9 (d) 10^-15, 10^-6, and 10^12

(c) Pico 10^-12 Nano 10^-9 Giga 10^9

Which of the following expresses a principle, which was initially stated by Galileo and was later incorporated into Newton's laws of motion? (a) An object's acceleration is inversely proportional to its mass. (b) For every action there is an equal but opposite reaction. (c) The natural condition for a moving object is to remain in motion. (d) The natural condition for a moving object is to come to rest.

(c) The natural condition for a moving object is to remain in motion.

In mechanics, physicists use three basic quantities to derive additional quantities. Mass is one of the three quantities. What are the other two? a) length and force (b) power and force (c) length and time (d) force and time

(c) length and time

The speed of a boat is often given in knots. If a speed of 5 knots were expressed in the SI system of units, the units would be: (a) m. (b) s. (c) m/s. (d) kg/s

(c) m/s.

Changing the positive direction in a reference frame to the opposite direction does not change the sign of which of the following quantities? (a) velocity (b) average velocity (c) speed (d) displacement

(c) speed

If the displacement of an object, x, is related to velocity, v, according to the relation x = Av, the constant, A, has the dimension of which of the following? (a) acceleration (b) length (c) time (d) area

(c) time

If a is acceleration, v is velocity, x is position, and t is time, then which equation is not dimensionally correct? (a) t = x/v (b) a = v2/x (c) v = a/t (d) t2 = 2x/a

(c) v = a/t

7.0-kg bowling ball experiences a net force of 5.0 N. What will be its acceleration? *Note: f=ma (a) 35 m/s2 (b) 7.0 m/s2 (c) 5.0 m/s2 (d) 0.71 m/s2

(d) 0.71 m/s2

Which of the following is an example of the type of force that acts at a distance? (a) gravitational (b) magnetic (c) electrical (d) all of the above

(d) all of the above

Which formula is dimensionally consistent with an expression yielding a value for velocity? (a is acceleration, x is distance, and t is time) (a) v/t2 (b) vx2 (c) v2/t (d) at

(d) at

Since 1983 the standard meter has been defined in terms of which of the following? (a) specific alloy bar housed at Sevres, France (b) wavelength of light emitted by krypton‑86 (c) distance from the Earth's equator to the North Pole (d) the distance light travels in a certain fraction of a second

(d) the distance light travels in a certain fraction of a second

The term motion refers to a change in position with respect to a. a specific reference b. the ground c. the center of the Earth d. the Sun

a. a specific reference

The basic unit of length in the MKS system is a. meter b. liter c. centimeter d. foot

a. meter

Acceleration may be measured in a. meters/sec b. ft/sec c. miles/ hour d. centimeters

a. meters/sec

In successive seconds an object moves from start position, then moves 1 ft, 4 ft, and 8 ft. This is an example of a. non-uniform motion b. uniform acceleration c. uniform motion d. free fall in the Earth's gravitational field

a. non-uniform motion

Since 1967 the standard definition for the second of time has been based on which of the following? a. the characteristic frequency of the cesium 133 atom b. the average solar day c. the average solar year d. a pendulum clock housed in Sevres, France

a. the characteristic frequency of the cesium 133 atom

On a distance-time graph, a horizontal line is a. zero velocity b. constant velocity c. increasing velocity d. decreasing velocity

a. zero velocity

Since 1960 the standard meter has been defined in terms of which of the following? a. A specific alloy bar housed at Sevres, France. b. The wavelength of light emitted by krypton 86. c. The distance from the equator to the North pole. d. The diameter of the hydrogen atom

b. The wavelength of light emitted by krypton 86.

The metric system prefix meaning is a. milli- b. centi- c. kilo- d. mega-

b. centi-

Of the following, the shortest is a. 1 mm b. 0. 01 meter c. 0.001 ft d. 0.0001 km

c. 0.001 ft

One inches equals a. 1.0 cm b. 0.001 meters c. 2.54 cm d. 0.4 mm

c. 2.54 cm

A uniformly accelerated car starts from rest and travels 2 feet during the first second. Its acceleration is a. 2ft/sec b. 2ft/ sec^2 c. 4ft/sec^2 d. 32ft/sec^2 d=1/2 at^2, sovling for a, we have a= 2d/t^2= 2*2ft/ 1^2s^2= 4ft/s^2

c. 4ft/sec^2

A body whose velocity is constant has a. positive acceleration b. negative acceleration c. zero acceleration d. all of the abov

c. zero acceleration

A ball is thrown vertically upwards at 19.6 m/s. What is its maximum height. (a) 19.6 m. (b) 9.80 m. (c) 14.90 m. (d) 30.23 m.

(a) 19.6 m.

One year is about ________ seconds while one day is exactly ________ seconds. (a) 3.16 x 10^7; 86,400 (b) 5.26 x 10^5; 86,400 (c) 3.16 x 10^7; 8,640 (d) 1.04 x 10^6; 36,000

(a) 3.16 x 10^7; 86,400

A truck moves 70 m east, then moves 120 m west, and finally moves east again a distance of 90 m. If east is chosen as the positive direction, what is the truck's resultant displacement? (a) 40 m (b) - 40 m (c) 280 m (d) -280 m

(a) 40 m

Which of the following is not a vector quantity? (a) temperature (b) velocity (c) acceleration (d) displacement

(a) temperature

If we know an object is moving at constant velocity, we may assume: (a) the net force acting on the object is zero. (b) there are no forces acting on the object. (c) the object is accelerating. (d) the object is losing mass.

(a) the net force acting on the object is zero.

Which expression is dimensionally consistent with an expression that would yield a value for time-1?(v is velocity, x is distance, and t is time) (a) v/x (b) v2/x (c) x/t (d) v2t

(a) v/x

Displacement is which of the following types of quantities? (a) vector (b) scalar (c) magnitude (d) dimensional

(a) vector

Water flows into a swimming pool at the rate of 8.0 gal/min. The pool is 16 ft wide, 32 ft long and 8.0 ft deep. How long does it take to fill? (1 U.S. gallon = 231 cubic inches) (a) 32 hours (b) 64 hours (c) 48 hours (d) 24 hours

(b) 64 hours

a. 78.9 + 0.2 b. 3.788 x10 ^9 c. 2.46x10^-6 d. 0.0032

a) 3 significant figures b) 4 significant figures c) 3 significant figures d) 2 significant figures

1.10 The speed of light is now defined to be c = 2.997 924 58 ´ 108 m/s. Express the speed of light to (a) three significant figures, (b) five significant figures (c) seven significant figures

a. Rounded to 3 significant figures: c = 3.00 ´ 108 m/s b. Rounded to 5 significant figures: c = 2.997 9 ´ 108 m/s c. Rounded to 7 significant figures: c = 2.997 925 ´ 108 m/s

A steel rod is about one and quarter meters long. Its length in inches is closest to a. 50 inches b. 320 inches c. 125 inches d. 100 inches

a. 50 inches