In which of the following cases would the maximum contact pressure from the floor on a person be the least?
1.when the person is lying down on the floor
2.when the person is sitting on the floor
3.when the person is standing on the floor
4.when the person is standing on their tip-toes on the floor
[Ques. 2] A block of steel is found on a ship sunk in 5000 meters of water, where pressures are about 500 times that on the Earth at sea level. To know its dimensions at sea level, which relationship between stress and strain for this metal would we need to know?
1.Young's modulus
2.shear modulus
3.bulk modulus
4.none of these
[Ques. 3] An engineer tests a strip of metal by applying a pulling force to the metal and measuring the change in length of the metal. Which relationship between stress and strain could she determine for this piece of metal?
1.Young's modulus
2.shear modulus
3.bulk modulus
4.none of these
[Ques. 4] To describe the relationship between the stress and strain for a cube of Jello when it jiggles from side to side, which of the following would we use?
1.the shear modulus
2.the bulk modulus
3.Young's modulus
4.none of these
[Ques. 5] A tall crate and a short crate (both rectangular and of similar construction) of equal mass and equal base size are placed side by side on an incline, without touching each other. As the incline angle is increased, which crate will topple first?
1.the tall crate
2.the short crate
3.Both will topple at the same time.
4.It is impossible to tell, they will topple differently every time.
[Ques. 6] The center of gravity is a useful point at which to balance an object. For instance, a ruler can be balanced by placing its center on your finger. Is it possible for the center of gravity of an object to be located at a point where no material exists to balance the object?
1.no, never
2.only for very unsymmetrical objects
3.It is possible in theory, but no objects have been found for which this occurs.
4.Yes, it is possible.
[Ques. 7] A 100 gram meter stick has a wad of clay on one end of it. The stick is supported from a fulcrum point 33 1/3 cm from the clay. What is the clay's mass?
1.25 grams
2.50 grams
3.100 grams
4.200 grams
[Ques. 8] If an object were in torque equilibrium and in force equilibrium, could it
(i) be stationary?
(ii) move in a straight-line path?
(iii) rotate in place?
(iv) rotate while moving in a straight-line path?
1.(i) only
2.(i), (ii), and (iii)
3.(ii) and (iii) only
4.all of these
[Ques. 9] A single force acts on an object and the torque caused by the force is nonzero about some point. Is there any other point about which the torque is zero?
1.Yes, under any circumstance there is such a point.
2.No.
3.Yes, but only if the force is centripetal.
4.It is impossible to determine.
[Ques. 10] If the torque acting on an object about a certain axis is zero, what can we say about the angular momentum of this object with respect to this axis?
1.It is zero.
2.It is constant.
3.It can never be zero.
4.Nothing, angular momentum has nothing to do with torque.
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