A juggler throws two balls up to the same height so that they pass each other halfway up when A is rising and B is descending. Ignore air resistance and buoyant forces. Which statement is true of the two balls at that point?
A. There is an residual upward force from the hand on each ball.
B. There is a greater residual force from the hand on A than there is on B.
C. Only gravity acts on B but there is an additional residual force from the hand on A.
D. There is an additional downwards force besides gravity on each ball.
E. The only force acting on each ball is the gravitational force.
Answer: E
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Two moles of an ideal gas are placed in a container of adjustable volume. When measurements are made
A. the pressure is inversely proportional to the volume at constant temperature. B. the temperature is directly proportional to the volume at constant pressure. C. the temperature is directly proportional to the pressure at constant volume. D. all the statements above are found to be correct. E. only statements (a) and (b) are found to be correct.
A 2.0-kg block sliding on a horizontal frictionless surface is attached to one end of a horizontal spring (k = 200 N/m) which has its other end fixed. If the block has a speed of 4.0 m/s as it passes through the equilibrium position, what is its speed when it is 20 cm from the equilibrium position?
a. 2.6 m/s b. 3.1 m/s c. 3.5 m/s d. 1.9 m/s e. 2.3 m/s
In a Western movie, a person shoots an arrow backward from a fleeing horse. If the velocity of the horse relative to the ground is 13 m/s west and the arrow’s velocity relative to the horse is 38 m/s east, what is the arrow’s velocity with respect to the ground?
A. 41 m/s east B. 41 m/s west C. 25 m/s east D. 25 m/s west
Lava can be
A) extruded from a volcano. B) a cooled, solid rock. C) intruded as a dike. D) both A and B.