An organ pipe that is 1.75 m long and open at both ends produces sound of frequency 303 Hz when resonating in its second overtone. What is the speed of sound in the room?
What will be an ideal response?
354 m/s
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A 15.0-kg child is sitting on a playground teeter-totter, 1.50 m from the pivot. What is the minimum distance, on the other side of the pivot, such that a 220-N force will make the child lift off the ground?
A) 1.00 m B) 1.50 m C) 0.102 m D) 9.78 m E) 2.35 m
Magnetic Field of a Long Wire: A long straight wire has a constant current flowing to the right. A rectangular metal loop is situated above the wire, and also has a constant current flowing through it, as shown in the figure. Which one of the following statements is true? 
A. The net magnetic force on the rectangle is upward, and there is also a nonzero torque on the rectangle. B. The net magnetic force on the rectangle is zero, and the net torque on it is zero. C. The net magnetic force on the rectangle is downward, and there is also a nonzero torque on the rectangle. D. The net magnetic force on the rectangle is zero, but there is a nonzero torque on the rectangle. E. The net magnetic force on the rectangle is downward, and the net torque on it is zero.
Characteristic peaks occur in an x-ray spectrum of an atom because electrons in the atom make transitions to lower energy levels after being bombarded with high energy electrons
a. True b. False Indicate whether the statement is true or false
Which of the following is true of a light-year(ly)?
A) It is a unit of time. B) It is a unit of mass. C) It is a smaller unit of distance than kilometers. D) It is a larger unit of distance than the astronomical unit.