A 50 kg uniform ladder, 5.0 m long, is placed against a smooth wall at a height of h = 3.7 m. The base of the ladder rests on a rough horizontal surface whose coefficient of static friction is 0.40
An 80 kg block is suspended from the top rung of the ladder, just at the wall. In Figure 10.12, the magnitude of the force exerted on the base of the ladder, due to contact with the rough horizontal surface is closest to: A) 1,580
B) 1,560
C) 1,550
D) 1,600
E) 1,610
A
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The sedimentary rock known as ______________ consists of rounded pebbles cemented together by silica, calcium carbonate, or iron oxide
Fill in the blank(s) with correct word
Galaxies may contain a supermassive black hole at their center but ___________ an active nucleus because of ____________ into the black hole
a. show; mass inflow b. not show; mass inflow c. show; lack of mass inflow
Spherical Mirrors: An object is in front of a concave spherical mirror, and its image is 4.0 cm behind the mirror. If the focal length of the mirror has a magnitude of 5.0 cm, where is the object?
A. 2.2 cm in front of the mirror B. 2.2 cm behind the mirror C. 9.0 cm in front of the mirror D. 1.0 cm behind the mirror
If the spectrum of star jessica peaks at optical wavelengths, and star Jacob's surface is twice as hot as jessica's surface, then jacob's spectrum peaks in the infrared.
Indicate whether the statement is true or false.