A steel wire, 3.2 m long, has a diameter of 1.2 mm. The wire stretches 1.6 mm when it bears a load. Young's modulus for steel is 2.0 × 1011 Pa. The mass of the load is closest to
A) 28 kg. B) 24 kg. C) 16 kg. D) 20 kg. E) 12 kg.
E
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The force that propels a cannonball when fired from a cannon is
A) huge compared to the recoil force on the cannon. B) equal and opposite to the force the ball exerts on the cannon. C) in some cases, equal and opposite to the force the ball exerts on the cannon.
The total number of comets orbiting the Sun is estimated to be about
A) 1 trillion. B) 1,000. C) 100,000. D) 1 million.
John says that the value of the function cos[?(t + T) + ?], obtained one period T after time t, is greater than cos(?t + ?) by 2?. Larry says that it is greater by the addition of 1.00 to cos(?t + ?). Which one, if either, is correct?
A. John, because ?T = 2?. B. John, because ?T = 1 radian. C. Larry, because ?T = 2?. D. Larry, because ?T = 1 radian. E. Neither, because cos(? + 2?) = cos?.
The speed of light is a relativistically invariant quantity
a. True b. False Indicate whether the statement is true or false