A 75.0 kg ladder that is 3.00 m in length is placed against a wall at an angle theta. The center of gravity of the ladder is at a point 1.2 m from the base of the ladder. The coefficient of static friction at the base of the ladder is 0.400. There is no friction between the wall and the ladder. What is the minimum angle the ladder makes with the horizontal for the ladder not to slip and fall?
A. 35 degrees
B. 45 degrees
C. 53 degrees
D. 60 degrees
E. 65 degrees
B. 45 degrees
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Mercury and the Moon appear similar, but we note that:
A) the lunar mare are darker than Mercury's intercrater plains. B) Mercury has "weird terrain" opposite its huge Caloris Basin. C) Mercury has striking lobate scarps due to the shrinking of its core. D) Mercury does not always keep the same face toward the Sun, while the Moon does have the Earthside always facing us. E) All of the above are correct.
A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts.The power consumed by the light bulb in watts is
a. 0.05 b. 20. c. 720 d. none of the above.
Which carbohydrate cannot be digested by humans as a direct source of energy?
a. Fructose b. Glucose c. Sucrose d. Cellulose e. Starch
According to two different estimates, coal reserves can be 250 Gt or 450 Gt, almost twice as much. Why is it so difficult to pin down the reserves' total?
What will be an ideal response?