Blocks A and B of masses 18 kg and 19 kg, respectively, are connected by a rope, which passes over a light frictionless pulley, as shown
The horizontal surface is rough. The coefficients of static and kinetic friction are 0.40 and 0.20, respectively. External forces P and Q act on block B, as shown. In Figure 5.20, force P equals 76 N. The force Q for which the block descends at constant speed is closest to:
A) 120 N
B) 130 N
C) 140 N
D) 160 N
E) 72 N
A
You might also like to view...
Which planet is often called our most brilliant "morning star"?
a. Venus b. Jupiter c. Mars d. Mercury e. Saturn
How does an H-R diagram make it clear that giant stars are larger than main-sequence stars of the same temperature?
What will be an ideal response?
Opposing shearing forces of 3000 N are applied to the 4.00-cm × 5.00-cm faces of a metal block measuring 3.00 cm × 4.00 cm × 5.00 cm. By what amount does the block become slanted? The shear modulus for this metal is 8.10 × 1010 N/m2
A) 5.56 × 10-7 m B) 9.88 × 10-7 m C) 6.98 × 10-6 m D) 1.54 × 10-6 m E) 3.08 × 10-6 m
When a workman strikes a steel pipeline with a hammer, he generates both longitudinal and transverse waves. The two types of reflected waves return 2.4 s apart. How far away is the reflection point? (For steel, vL = 6.2 km/s, vT = 3.2 km/s)