Q&A Hero

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?

Q: A car has a momentum of . How fast is the car moving?

Q: A car is traveling at 108 km/h. What is its momentum?

Q: The SI unit for momentum is a. b. c. d.

Q: The physical quantity of momentum is a vector quantity (has both magnitude and direction). a. True b. False

Q: Which has more influence on a moving object's momentum? a. the object's mass b. the object's velocity c. both mass and velocity d. none of the above

Q: What does L stand for in the following equation (m is mass and v is velocity): a. Length b. Inertia c. Momentum d. Torque

Q: What does I stand for in the following equation (m is mass and r is distance): a. mass moment of Inertia b. Intensity c. Inductance d. Internal volume

Q: The farther away the mass is located from the center of rotation, the harder it is to rotate the mass about the given center of rotation. a. True b. False

Q: The closer the mass is located to the center of rotation, the harder it is to rotate the mass about the given center of rotation. a. True b. False

Q: The relationship between the mass flow rate and the volume flow rate is given by a. mass flow rate is equal to (time)(volume flow rate) b. mass flow rate is equal to (density)(volume flow rate) c. mass flow rate is equal to (mass)(volume flow rate) d. none of the above

Q: The SI unit for mass flow rate is a. kg/s b. slugs/s c. lbm/s d. none of the above

Q: Mass flow rate is a fundamental dimension. a. True b. False

Q: The amount of mass that flows through something per unit of time is called a. mass moment of inertia b. volumetric flow rate c. mass flow rate d. none of the above

Q: A truck and a motorcycle are moving with the same momentum. Which has the greater kinetic energy? a. Truck b. Motorcycle

Q: The Earth has a mass of and an average radius of . What is the average density of the Earth? a. b. c. d.

Q: What happens to the density of a marshmallow when squeeze it? a. Increases b. Decreases c. Remains constant

Q: What happens to the mass of a marshmallow when squeeze it? a. Increases b. Decreases c. Remains constant

Q: What happens to the volume of a marshmallow when squeeze it? a. Increases b. Decreases c. Remains constant

Q: A rectangular block of aluminum has the following dimensions: . The density of aluminum is . How much does the block of aluminum weigh? a. b. c. d.

Q: When a spinning ice skater pulls her arms inward, her angular velocity a.. increases b. decreases c. remains the same

Q: What is the momentum of a object that slides at across an icy lake? a. b. c. d. None of the above

Q: The SI unit for specific weight is a. b. c. d. N/m3

Q: Specific weight is a fundamental dimension. a. True b. False

Q: The ratio of an object's weight to its volume is a. density b. specific volume c. specific gravity d. specific weight

Q: The SI unit for specific gravity is a. b. c. d. unitless

Q: The specific gravity is unitless a. True b. False

Q: The ratio of an object's density to the density of water is a. density b. specific volume c. specific gravity d. specific weight

Q: The SI unit for specific volume is a. b. c. d.

Q: The ratio of an object's volume to its mass is a. density b. specific volume c. specific gravity d. specific weight

Q: The SI unit for density is a. b. c. d.

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

Q: The ratio of an object's mass to its volume is a. density b. specific volume c. specific gravity d. specific weight