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College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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
Transcribed Image Text:When no air resistance acts on a fast-moving baseball, its acceleration is
downward, g
due to a combination of constant horizontal motion and accelerated downward
motion.
opposite to the force of gravity
at right angles
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- A contestant in a winter games event pushes a 40.0 kg block of ice across a frozen lake as shown in the flgure. 25° The coefficient of static friction is 0.1 and the coefficient of kinetic friction is 0.03. (a) Calculate the minimum force F (in N) he must exert to get the block moving. (b) What is its acceleration (in m/s2) once it starts to move, if that force is maintained? m/s2arrow_forwardCalculate the range of the baseball in the presence of the air drag. Assume that initial speed of the baseball is 50m/s, initial angle = 30 degrees, mass m=0.142kg. Coefficient of air drag k=0.0013kg/s.arrow_forwardA 66.0 kg and a 93.0 kg skydiver jump from an airplane at an altitude of 5.95 ✕ 103 m, both falling in the pike position. Assume all values are accurate to three significant digits. (Assume that the density of air is 1.21 kg/m3 and the drag coefficient of a skydiver in a pike position is 0.7.) How long will it take (in s) for each skydiver to reach the ground (assuming the time to reach terminal velocity is small)? 66.0 kg skydiver 93.0 kg skydiverarrow_forward
- Ngelecting air resistance, for a projectile in the air that was launched at a non-zero angle, does it feel any force the x direction?arrow_forwardWhen a parachutist opens her parachute after reaching terminal speed, in what direction does she accelerate?arrow_forwardCan we write that linear acceleration in part (a) is downwards due to mg? Can we write that linear acceleration in part (b) is upwards due to centripetal acceleration? Why or Why Not?arrow_forward
- What is the magnitude of the acceleration of a skydiver who is currently falling at one-half his eventual terminal speed?arrow_forwardA 500 g ball is launched upward at 60 mis and is acted on by gravityand air resistance that can be expressed in the form -kv, where v is theball's velocity.(a) Determine the ball's velocity v(t), expressed in terms of k.(b) Determine the ball's height y(t), expressed in terms of k.(c) Determine H(k), the maximum height reached by the ball, as a function of k.arrow_forwardShow that the acceleration of any object down a frictionless incline that makes an angle θ with the horizontal is a = g sin θ. (Note that this acceleration is independent of mass.)arrow_forward
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