An object that weighs 75 N is pulled on a horizontal surface by a horizontal pull of 50 N to the right. The friction force on this object is 30 N to the left. What is the acceleration of the object?
A) 0.27 m/s2
B) 1.1 m/s2
C) 2.6 m/s2
D) 11 m/s2
C
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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 upper limit to the mass of a white dwarf is 1.4 solar masses
Indicate whether the statement is true or false
Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. Sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. Which one, if either is correct?
A. Beryl, because low thermal conductivity results in low heat transfer. B. Beryl, because low thermal conductivity results in high heat transfer. C. Sapphire, because low thermal conductivity results in low heat transfer. D. Sapphire, because low thermal conductivity results in high heat transfer. E. Neither, because low heat transfer is desirable both in summer and in winter.
On a giant rotating turntable are two clocks, one at the center and the other at the rim.The clock that runs slower is at
A) the center of the turntable. B) the rim of the turntable. C) either of these