How does the mass of the products of a nuclear fusion reaction compare to the mass of the original elements?
A) The mass of the products is less than the mass of the original elements.
B) The mass of the products is greater than the mass of the original elements.
C) The mass of the products is unrelated to the mass of the original elements.
D) The mass of the products is equal to the mass of the original elements.
A
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An aluminum cantilever beam (E 5 72 GPa) with a square cross sec-tion and span length L 5 2.5 m is subjected to uniform load q 5 1.5 kN/m. The allowable bending stress is 55 MPa. The maximum deflection of the beam is approximately:
(A) 10 mm
(B) 20 mm
(C) 30 mm
(D) 40 mm
You are given a copper bar of dimensions 3 cm × 5 cm × 8 cm and asked to attach leads to it in order to make a resistor. If you want to achieve the largest possible resistance, you should attach the leads to the opposite faces that measure
A) 3 cm × 5 cm. B) 3 cm × 8 cm. C) 5 cm × 8 cm. D) Any pair of faces produces the same resistance.
The supermassive black holes that may be powering active galaxies emit only synchrotron radiation
Indicate whether the statement is true or false
A man drags a 130-kg object down an inclined plane at a speed of 1.40 m/s. The coefficient of friction between the object and the inclined plane is 0.800 and the angle of inclination with the horizontal is 23.0°
What is the amount of power this man expends in dragging this object? Use g = 10.0 m/s2. A) 1520 watts B) 1730 watts C) 629 watts D) 214 watts E) 416 watts