Which of the following statements is an overall summary of the findings from the Viking biology experiments?
A) the martial soil showed no signs of chemical or biological activity
B) the Martian soil showed clear signs of biological activity
C) the Martian soil is chemically reactive but shows no signs of biological activity
D) the Martian soil contained organic molecules but showed no signs of biological activity
C
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A 5.0-g particle moving 60 m/s collides with a 2.0-g particle initially at rest. After the collision each of the particles has a velocity that is directed 30° from the original direction of motion of the 5.0-g particle. What is the speed of the 2.0-g particle after the collision?
a. 72 m/s b. 87 m/s c. 79 m/s d. 94 m/s e. 67 m/s
A bag of potato chips contains 2.00 L of air when it is sealed at sea level at a pressure of 1.00 atm and a temperature of 20.0°C
What will be the volume of the air in the bag if you take it with you, still sealed, to the mountains where the temperature is 7.00°C and atmospheric pressure is 70.0 kPa? Assume that the bag behaves like a balloon and that the air in the bag is in thermal equilibrium with the outside air. (1 atm = 1.01 × 105 Pa) A) 4.13 L B) 2.76 L C) 1.01 L D) 1.38 L
What current in a solenoid 15.0-cm long wound with 100 turns would produce a magnetic field equal to that of the Earth, 5.00 × 10^?5 T?
An ideal pulley changes the direction of the tension in a string without changing its magnitude
Indicate whether the statement is true or false