Q&A Hero

Q: Thermometers use varying physical properties to measure temperature. Which of the following variable physical properties are utilized in thermometers? a. expansion b. electrical resistance c. color d. all of the above

Q: Temperature is a macroscopic measurement of a microscopic phenomenon. a. True b. False

Q: The physical quantity that quantifies or provides a measure of how active molecules are on a microscopic level is a. density b. temperature c. viscosity d. specific weight

Q: The physical quantity that provides a measure of molecular activity and the internal energy of an object is a. density b. temperature c. viscosity d. specific weight

Q: Which of the following material properties varies with temperature? a. density b. viscosity c. electrical resistance d. all of the above

Q: Temperature is a fundamental dimension. a. True b. False

Q: Material properties are not a function of temperature. a. True b. False

Q: Civil engineers must design the structures in such a way as to allow for expansion and contraction of materials, such as concrete and steel that occur due to changes in the surrounding temperatures. a. True b. False

Q: Mechanics deals with the study of behavior of objects or structural members when subjected to forces. a. True b. False

Q: Linear impulse represents the net effect of a force acting over a period of time and brings about a change in the linear momentum of the object. a. True b. False

Q: The modulus of rigidity is a measure of how easily a material can be twisted or sheared. a. True b. False

Q: The value of fluid bulk modulus shows how easily the volume of the fluid can be reduced when the pressure acting on it is increased. a. True b. False

Q: A brittle material, when subjected to a tensile load, will go through significant permanent deformation before it breaks. a. True b. False

Q: A ductile material shows little or no permanent deformation before it ruptures. a. True b. False

Q: The modulus of elasticity is a measure of how easily a material will stretch when pulled (subject to a tensile force) or how well the material will shorten when pushed (subject to a compressive force). a. True b. False

Q: The modulus of elasticity, or Young's modulus, is computed by calculating the slope of a stress-strain diagram over the elastic region. a. True b. False

Q: Stress provides a measure of the intensity of internal forces acting over an area. a. True b. False

Q: Geometric properties of an object such as its length, area, and first and second moment of area do not play significant roles in the way the object responds to a force. a. True b. False

Q: The absolute pressure is related to the gauge pressure according to a. True b. False

Q: A "teeter-totter" (or "see-saw" if you prefer) has a 50 lb child sitting at one end, 10 ft from the center pivot point (fulcrum). How far from the center point should a 125 lb adult sit in order to balance the teeter-totter? a. 2.5 ft b. 4 ft c. 6.5 ft d. 10 ft

Q: Calculate the torque produced by a 50 N perpendicular force at the end of a 20 cm-long wrench. a. 10 N.m b. 1000 N.m c. 2.5 N/m d. 0.4 cm/N

Q: A "suction cup" sticks to the wall because it is a. pulled to the wall by vacuum b. pushed to the wall by the atmospheric pressure c. both of these d. none of the above

Q: What is the SI unit for pressure? a. b. c. d.

Q: Pressure is a fundamental dimension. a. True b. False

Q: Identify the force that accelerates a car: a. the car pushing on the road b. the road pushing on the car c. the engine pushing on the wheels d. the wheels pushing on the engine

Q: A tow truck exerts a force of on a car, causing it to accelerate at . What is the mass of the car? a. 45 slugs b. 45 lbm c. 45 kg d. None of the above

Q: A tow truck exerts a force of on a car, causing it to accelerate at . What is the mass of the car? a. b. c. d. e. None of the above

Q: If a small sports car collides head-on with a massive truck, which vehicle experiences the greater impact force? Which vehicle experiences the greater acceleration due to the impact?

Q: What does g stand for in the following equation? a. Weight b. Gallons c. Acceleration due to gravity d. none of the above

Q: What does W stand for in the following equation? a. Weight b. Work c. Watts d. none of the above

Q: What does F stand for in the following equation? a. Gravitational force b. Friction c. Viscous friction d. Weight

Q: What does r stand for in the following equation? a. Radius of the earth b. Universal gravitational constant c. Resistance d. Center-to-center distance between objects

Q: What does G stand for in the following equation? a. Gravity b. Universal gravitational constant c. Gallons d. Weight

Q: Weight and mass are essentially the same thing. a. True b. False

Q: The weight of an object is the force that is exerted on the mass of the object by the earth's gravity. a. True b. False

Q: If you push on the wall with a force of 10 pounds the wall pushes back on you with a force of 10 pounds. This is a basic description of a. Newton's 1st Law b. Newton's 2nd Law c. Newton's 3rd Law d. None of the above

Q: When a force causes an object to accelerate, the force and the resulting acceleration have a. the same direction. b. different directions. c. no relationship between their directions. d. none of the above

Q: The acceleration of an object is directly proportional to the force that is causing the acceleration. This is a basic description of a. Newton's 1st Law b. Newton's 2nd Law c. Newton's 3rd Law d. Newton's 4th Law

Q: In his second law, Newton observed that force and acceleration are a. inversely proportional b. directly proportional c. all of the above d. none of the above

Q: Objects at rest tend to remain at rest and objects in motion tend to remain in motion, unless acted upon by an unbalanced external force. This is a basic description of a. Newton's 1st Law b. Newton's 2nd Law c. Newton's 3rd Law d. Newton's 4th Law

Q: If you drop your textbook, while it is falling it speeds up, therefore a. there are no forces acting on the book. b. all of the forces acting on the book are balanced. c. the forces acting on the book are unbalanced. d. none of the above

Q: If you push on your textbook so that it slides across the table at a constant velocity, a. there must not be any forces acting on the book, otherwise it would accelerate. b. all of the forces acting on the book must be balanced. c. the book must be changing direction. d. none of the above

Q: If an object is moving and there are no unbalanced forces acting on it, the object will a. speed up. b. slow down. c. continue moving at constant velocity. d. none of the above

Q: If an object is at rest and there are no unbalanced forces acting on it, the object will a. speed up. b. slow down. c. remain at rest. d. none of the above

Q: In general, the viscosity of liquids increases with increasing temperature. a. True b. False

Q: In general, the viscosity of gases increases with increasing temperature. a. True b. False

Q: The quantity that represents a measure of how easily a given fluid can flow is known as a. density b. specific weight c. viscosity d. none of the above

Q: The property of a fluid that quantifies fluid friction is called a. coefficient of friction b. coefficient of restitution c. density d. viscosity

Q: What does stand for in the following equation? a. Newtons b. Normal force c. Natural force d. Natural frequency

Q: What does stand for in the following equation? a. coefficient of friction b. coefficient of restitution c. spring constant d. viscosity

Q: If you push sideways gently on your textbook and it doesn"t move, it is most likely because a. the book's mass is large enough to resist your push. b. your push is too small to overcome the book's inertia. c. friction is pushing on the book in the opposite direction as your push. d. none of the above

Q: A force of 20 N causes a spring to stretch 5 cm. What is the spring constant? a. 1 N/m b. 2 N/m c. 20 N/m d. 400 N/m

Q: The value of the spring constant depends on a. the type of material used to make the spring. b. the shape and winding of the spring. c. All of the above d. None of the above, that's why it's called a "constant."

Q: Over the elastic range, the deformation of a spring is inversely proportional to a. the amount of stretch. b. the amount of compression. c. the applied force. d. the spring constant.

Q: Over the elastic range, the deformation of a spring is directly proportional to a. the amount of stretch. b. the amount of compression. c. the applied force. d. the spring constant.

Q: A force that will accelerate 1 slug of mass at a rate of is known as a a. pound force. b. Newton. c. ton. d. metric ton.

Q: One Newton is equal to a. b. c. d.

Q: A force that will accelerate 1 kilogram of mass at a rate of is known as one a. pound. b. Newton. c. ton. d. metric ton.

Q: Forces tend to do what to objects upon which they act? a. move them b. rotate them c. elongate, shorten them, or bent them d. all of the above

Q: Unlike many other vector quantities, which are defined by their magnitude and direction, force is also defined by its a. color b. duration c. length d. point of application

Q: The physical quantity of force has a. magnitude only. b. direction only c. both magnitude and direction d. neither magnitude nor direction

Q: The physical quantity of force is a vector quantity (has direction). a. True b. False

Q: Which of the following is the SI unit for force? a. Pounds b. Newtons c. Grams d. Kilograms

Q: A satellite orbits the earth instead of flying off into space because a. rocket thrusters continuously push it towards the earth. b. solar reflectors continuously push it towards the earth. c. wind sails continuously push it towards the earth. d. gravity continuously pulls it towards the earth.

Q: If you drop your textbook it falls because the earth pulls it downward. At the same time, your textbook pulls on the earth with a force that is a. equal to the downward pull on the textbook and in the same direction. b. equal to the downward pull on the textbook but in the opposite direction. c. immeasurably small. d. zero.

Q: All forces result from direct contact. a. True b. False

Q: Forces always come in pairs, equal in magnitude and opposite in direction. a. True b. False

Q: A single force can exist all by itself. a. True b. False

Q: Which of the following statements best describes what weight is? a. Weight is the amount of mass something has. b. Weight is resistance to acceleration. c. Weight is a force due to gravity acting on a mass. d. Weight describes how massive something is.

Q: Force is a fundamental dimension. a. True b. False

Q: An aluminum alloy has a density of 2800 kg/m3. What is its specific weight? a. 27500 N/m3 b. 2800 N/m3 c. 27500 m3/kg d. 2800 m3/kg

Q: A roll of kitchen aluminum foil is 30 cm wide by 22 m long (if you unroll it). If the foil is 0.15 mm thick, and the density of aluminum is, what is the mass of the roll of aluminum foil? a. 267 kg b. 26.7 kg c. 2.67 kg d. 0.267 kg

Q: A roll of kitchen aluminum foil is 30 cm wide by 22 m long (if you unroll it). If the foil is 0.15 mm thick, and the specific weight of aluminum is , how much does the roll of aluminum foil weigh? a. 52.4 N b. 5.24 N c. 262 N d. 26.2 N

Q: It takes 5 seconds to fill a 500-ml bottle with water from your kitchen faucet. What is the mass flow rate from the faucet if water has a density of ? a. 1 kg/s b. 0.1 kg/s c. 0.01 kg/s d. 1 g/s

Q: While filling up your car with gasoline, you notice that it takes 3 minutes to dispense 50 liters of gasoline. What is the mass flow rate if water has a density of and gasoline has a specific gravity of 0.72? a. 2 kg/s b. 0.2 kg/s c. 20 kg/s d. 200 kg/s

Q: An aluminum cylinder is long and has a mass of, and if aluminum has a density of, what is the radius of the cylinder? a. 0.77 m b. 0.077 m c. 0.77 mm d. 7.7 mm

Q: A block of unknown metal has dimensions: . The block's density is . What is the mass of the block? a. b. c. d.

Q: A block of unknown metal has dimensions: . The block's mass is. What is the density of the block? a. b. c. d.

Q: Calculate the weight of all the air in a classroom with the dimensions of 9 m by 10 m by 3m. Assume the density of air to be approximately. Express your answers in both Newton and pound force.

Q: A car has a momentum of while traveling at. What is the car's mass?