In the H-R diagram, the bright blue-white stars that dominate the naked eye sky lie to the
A) top left.
B) top right.
C) middle of the main sequence.
D) top center.
E) bottom left.
A
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When a container of water is placed on a laboratory scale, the scale reads 120 g. Now a 20-g piece of copper (of density 8.9 g/cm3 ) is suspended from a thread and lowered into the water, not touching the bottom of the container
What will the scale now read? The density of water is 1.0 g/cm3. A) 120 g B) 122 g C) 138 g D) 140 g
Two long straight parallel wires separated by a distance of 20 cm carry currents of 30 A and 40 A in opposite directions. What is the magnitude of the resulting magnetic field at a point that is 15 cm from the wire carrying the 30-A current and 25 cm from the other wire?
a. 51 ?T b. 33 ?T c. 72 ?T d. 64 ?T e. 46 ?T
Each 2.0-m length of a long cylinder (radius = 4.0 mm) has a charge of 4.0 nC distributed uniformly throughout its volume. What is the magnitude of the electric field at a point 5.0 mm from the axis of the cylinder?
a. 9.9 kN/C b. 8.1 kN/C c. 9.0 kN/C d. 7.2 kN/C e. 18 kN/C
A common inactive ingredient in products such as sunscreen lotions and shampoo is triethyl amine, also known as TEA. Which of the following is the chemical structure for this compound?
A) a B) b C) c D) d