A 1.0-mol sample of an isotope is decaying with a half-life of 28 y. After 61 y, how many moles of this isotope are left and what is its activity in Bq?
What will be an ideal response?
0.22 mol, 1.0 × 1014 Bq
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You and your friends sit at opposite ends in the back of a pickup traveling north at 60 mph. Your friend, at the front of the pickup bed, throws a ball to you with a speed of 4 mph. You perceive the ball coming towards you with a velocity
A. 4 mph north. B. 4 mph south. C. 64 mph north. D. 56 mph north. E. 56 mph south.
A hot object that is glowing orange will become redder as it cools
a. True b. False Indicate whether the statement is true or false
Newton's Second Law in 1 Dimension: A 10-kg object is hanging by a very light wire in an elevator that is traveling upward. The tension in the rope is measured to be 75 N. What are the magnitude and direction of the acceleration of the elevator?
Fill in the blank(s) with the appropriate word(s).
Satellite Motion: Suppose NASA wants a satellite to revolve around Earth 5 times a day. What should be the radius of its orbit if we neglect the presence of the Moon? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 5.97 × 1024 kg)
A. 1.44 × 107 m B. 0.69 × 107 m C. 7.22 × 107 m D. 2.11 × 107 m