A 3.00-m-long ladder, weighing 200 N, leans against a smooth vertical wall with its base on a horizontal rough floor, a distance of 1.00 m away from the wall. The ladder is not completely uniform, so its center of gravity is 1.20 m from its base
What force of friction must the floor exert on the base of the ladder to prevent the ladder from sliding down? A) 93.3 N
B) 130 N
C) 28.3 N
D) 102 N
E) 150 N
C
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The ____________________ of the sun is composed of ionized gas and produces a continuous spectrum with a superimposed emission spectrum
Fill in the blank(s) with correct word
A sewing machine needle moves up and down in simple harmonic motion with an amplitude of 1.27 cm and a frequency of 2.55 Hz. (a) What is the maximum speed of the needle? (b) What is the maximum acceleration of the needle?
What will be an ideal response?
Two masses are suspended by a cord that passes over a pulley with negligible mass. The cord also has negligible mass. One of the masses, 
has a mass of 7.0 kg and the other mass, 
has a mass of 3.0 kg. The pulley turns on a shaft through the center of the pulley and supports the pulley and all the masses. The vertical force of the shaft on the pulley that supports the whole system is
A. 49 N upward.
B. 49 N downward.
C. 82 N upward.
D. 82 N downward.
E. 98 N upward.
The celestial object _______________ is just one of many small objects that orbit the Sun beyond Neptune
Fill in the blank(s) with correct word