A string that is 0.15 m long and fixed at both ends is vibrating in its n = 5 harmonic. The sound from this string excites a pipe that is long and open at both ends into its second overtone resonance
What is the distance between a node and an adjacent antinode, in the string? The speed of sound in air is 345 m/s.
A) 7.5 mm B) 23 mm C) 150 mm D) 30 mm E) 15 mm
E
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A very long straight wire carries a 12-A current eastward and a second very long straight wire carries a 14-A current westward. The wires are parallel to each other and are 42 cm apart. Calculate the force on a 6.4 m length of one of the wires
(?0 = 4? × 10-7 T ? m/A) A) 5.1 × 10-4 N B) 2.2 × 10-4 N C) 5.1 × 10-6 N D) 8.0 × 10-5 N E) 8.0 × 10-7 N
What is the magnitude of the gravitational force that two small 7.00-kg balls exert on each other when they are 35.0 cm apart? (G = 6.67 × 10-11 N ? m2/kg2 )
What will be an ideal response?
A force of 100 N is applied to a rod with a diameter of 6.00 mm. The stress in the rod is
a. 
b. 
c. 
d. 
e. 
Carla and Jenny are arguing about whether or not it is possible to escape the gravitational field of the Earth. Carla shows Jenny a system where mass m is rE (not the Earth's radius) distant from Earth and rP (not planet P's radius) distant from planet P, the mass being on the line connecting the Earth and planet P. Carla states that the mass m has escaped if FP on m = ?FE on m. Jenny
disagrees. Which one, if either, is correct, and why? a. Carla, because the total gravitational force on m is zero at that point. b. Carla, because there is no gravitational force from Earth on m at that point. c. Carla, because there is no gravitational force on m from Earth when r > rE. d. Jenny, because there is a gravitational force on m from Earth no matter how great the distance from the Earth. e. Jenny, because the gravitational force from the Earth can only be blocked by a body that is larger than the Earth.