An ideal gas has a pressure of 2.5 atm, a volume of 1.0 L at a temperature of 30°C. How many molecules are there in this gas? (R = 8.31 J/mol ? K, 1.00 atm = 101 kPa, NA = 6.022 × 1023)
A) 6.1 × 1023
B) 6.0 × 1022
C) 2.4 × 1022
D) 2.3 × 1023
B
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The half-life of radioactive iodine-137 is 8.0 days. How many iodine nuclei are necessary to produce an activity of 1.0 ?Ci? (1 Ci = 3.70 × 1010 Bq)
A) 4.6 × 109 B) 7.6 × 1012 C) 2.9 × 109 D) 3.7 × 1010
Two projectiles are launched at 100 m/s, the angle of elevation for the first being 30° and for the second 60°. Which of the following statements is false?
a. Both projectiles have the same acceleration while in flight. b. The second projectile has the lower speed at maximum altitude. c. Both projectiles have the same range. d. All of the above statements are true.
A 1.6-kg ball is attached to the end of a 0.40-m string to form a pendulum. This pendulum is released from rest with the string horizontal. At the lowest point of its swing, when it is moving horizontally, the ball collides with a 0.80-kg block initially at rest on a horizontal frictionless surface. The speed of the block just after the collision is 3.0 m/s. What is the speed of the ball just
after the collision? a. 1.7 m/s b. 1.1 m/s c. 1.5 m/s d. 1.3 m/s e. 2.1 m/s