answer per question. 1. When a race car is traveling at a constant speed on a ci
ID: 1461979 • Letter: A
Question
answer per question. 1. When a race car is traveling at a constant speed on a circular track, the net torque required to do so is: (A) constant (B) increasing (C) decreasing (D) zero (E) unkown 2 Which of the following is not an example of simple harmonic motion? Circle each letter and list them in the space provided. More than one could be correct. (A) a boy swinging very gently on a swing at the playground (B) the pendulum in a grandfather clock (C) a mass attached to a spring, bouncing up and down (D) A block being pushed side to side with a pause between each cycle 3.A piece of wood is being held completely below the surface of the water. If you now push the wood further down below the surface and hold it there, the buoyancy force on the wood block will (A) be unchanged (B) increase (C) decrease (D) go to zero (E) unkown When you walk on a floor in tennis shoes you apply a force to the floor equal to your weight. If you now walk on the floor in high heels, which of the following statements is the most correct. (A) force on the floor increases (B) pressure on the floor increases (C) force on the floor remains the same (D) pressure on the floor remains the same (E) both A and B (F) both B and C (G) both B and D (H) both A and DExplanation / Answer
(1)
When car moving traveling in circular path at a constant speed, the net torque acting on the car is zero.
Correct option is ( D )
(2)
The motion of the block is not simple harmonic, since there is pause at each cylce . In this case, the accelration of block is not proportinal to displacement block
Option ( D) is not an example for simple harmonic motion.
(3)
In this case, there is no water under the object submerged. Hence, there is no bouyant force acting on it.
Correct option is ( D )
(4)
The area of cross section of high heel is less. Hence the force acting on the floor increases.
since , P = F /A , area decreases results in pressure incrases , and hence force increases
Correct option is ( E )
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