For 1 gram of radioactive material that has a half-life of one year, after 4 years the original radioactive material left will be
A) 0 g.
B) 1/2 g.
C) 1/4 g.
D) 1/8 g.
E) none of the above
Answer: E
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An object is moving in a circular path of radius R. If the object moves through an angle of 30.0 degrees, then the angle is
A. 0.22 radians. B. 0.52 radians. C. 0.75 radians. D. 1.30 radians. E. 1.75 radians.
An aluminum light pole weighs 4300 N and supports an arm of weight 700 N, with the arm center of gravity at 1.2 m left of the centroidal axis of the pole. A wind force of 1500 N acts to the right at 7.5 m above the base. The pole cross section at the base has an outside diameter of 235 mm and thickness of 20 mm. The maximum compressive stress at the base is approximately:
(A) 16 MPa
(B) 18 MPa
(C) 21 MPa
(D) 24 MPa
One light-hour is the distance light travels in one hour. The speed of light is about 300,000 km/s . How far is 1 light-hour?
A) 300 thousand km (300,000, or 3 × 105 km) B) 1.08 billion km (1,080,000,000, or 1.08 ×109 km) C) 18 million km (18,000,000, or 1.8 × 107 km) D) 9.46 trillion km (9,460,000,000,000, or 9.46 × 1012 km)
A light bulb designed for use with AC would still work if hooked up to DC of the proper voltage
Indicate whether the statement is true or false