The figure shows an acceleration-versus-force graph for three objects pulled by rubber bands. The mass of object 2 is 36 kg. What are the masses of objects 1 and 3?
A) 14 kg and 90 kg
B) 72 kg and 18 kg
C) 90 kg and 18 kg
D) 14 kg and 72 kg
Answer: A
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Springs: It takes 87 J of work to stretch an ideal spring from 1.4 m to 2.9 m from equilibrium. What is the value of the spring constant (force constant) of this spring?
A. 27 N/m B. 77 N/m C. 52 N/m D. 39 N/m
The gauge pressure of the water in a swimming pool at 10 ft is twice the gauge pressure of the water at 5 ft
a. True b. False Indicate whether the statement is true or false
A point charge of +2.5 ?C is located at the origin of a coordinate system and a second point charge of ?5.6 ?C is at x = 1.9 m. At what point on the x axis is the electrical potential zero?
a. +4.3 m b. +5.3 m c. +0.59 m d. +11 m e. +1.3 m
Most likely, before biological evolution there was
A) chemical evolution B) physical evolution C) geological evolution D) no evolution of any kind