A majorette takes two batons and fastens them together in the middle at right angles to make an "x" shape. Each baton was 0.70 m long and each ball on the end is 0.10 kg. (Ignore the mass of the rods.) What is the moment of inertia if the arrangement is spun around an axis through the center perpendicular to both rods?
a. 7.0E–3 kg·m2 b. 2.5E–2 kg·m2
c. 1.2E–2 kg·m2 d. 4.9E–2 kg·m2
e. 7.0E–2 kg·m2
d
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A prismatic bar (diameter d0 5 18 mm) is loaded by force P1. A stepped bar (diameters d1 5 20 mm and d2 5 25 mm with radius of fillets R 5 2 mm) is loaded by force P2. The allowable axial stress in the material is 75 MPa. The ratio P1/P2 of the maximum permissible loads that can be applied to the bars, considering stress concentration effects in the stepped bar, is:
(A) 0.9
(B) 1.2
(C) 1.4
(D) 2.1
The inductance of a solenoid 16.0 cm long with a cross-sectional area of 1.00 × 10-4 m2 is 1.00 mH. How many turns of wire does this solenoid have?
A) 318,000 B) 159,000 C) 1130 D) 282 E) 150
Earth's interior is warmed by ________ and Earth's surface is warmed by ________
A) radioactive processes; fusion in the Sun B) fission; fossil fuels C) volcanoes; solar energy D) terrestrial radiation; terrestrial radiation
The magnitude of the electric field in the radiation field from an antenna is inversely proportional to the distance from the antenna
Indicate whether the statement is true or false