24.2 A tennis ball of mass 57.0 g is dropped from the observation deck of the Empire State building (369 m). The tennis ball has a
cross-sectional area of 3.50×10-3 m^2 and a drag coefficient of 0.600. Using 1.23 kg/m^3 for the density of air, (a) what is the
speed of the ball when it hits the ground? (b) What would be the final speed of the ball if you did not include air resistance in
your calculations? Remember to use the appropriate sign when answering the question.
(a) m/s
(b) m/sSection 25 - Interactive Problem: Forces in Multiple Dimensions
25.1 Use the simulation in the interactive problem in this section to answer the following questions. (a) If F 1 is set to 12 N directly
to the left, what should F 2 be set to so that the ball does not move when you press GO? (b) If F 1 is set to 10 N directly to the
left, what should F 2 be set to so that the ball hits the target directly to the right of the ball? (c) If F 1 is set to 10 N straight up,
what should F 2 be set to so that the ball hits the target that is up and to the right of the ball?(a) N, i. Straight up
ii. Directly to the right
iii. Straight down
iv. Directly to the left
(b) i. Any magnitude less than 10 N
ii. Exactly 10 N
iii. Any magnitude greater than 10 N, i. Straight up
ii. Directly to the right
iii. Straight down
iv. Directly to the left
(c) N, i. Straight up
ii. Directly to the right
iii. Straight down
iv. Directly to the left(^120) Copyright 2007 Kinetic Books Co. Chapter 5 Problems