Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 7, Problem 23P
To determine
To Find: The average force exerted on the diver by the diving board as shown in below figure.
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A ball of mass 0.300 kg is thrown upward, rising 10.0 m above the point at which it was released. Compute the average force exerted on the ball by the hand, if the hand moves through a distance of 20.0 cm as the ball is accelerated.
Problem 1: A60.0 kg skier with an initial speed of 13 m/s coasts up a 2.50 m high rise as
shown in the figure.
V; = ?
KE
V
2.5 m
35°
©theexpertta.com
A Find her final speed right at the top, in meters per second, given that the coefficient of friction between her skis and the snow is 0.39.
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sin)
cos()
tan()
8
9
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cotan()
asin()
acos()
E
5
atan()
acotan()
sinh()
1
2
3
cosh()
tanh()
cotanh()
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ODegrees O Radians
vol BACKSPACE
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A skier goes down a 200 m slope. (a) If his altitude changes by 80 m during the run, what is his speed at the bottom if there is no friction? (b) If the skier’s mass is 70 kg and his final speed is actually 15 m/s, find the average force exerted by friction. (You don’t need to know the detailed shape or angle of the slope.
Chapter 7 Solutions
Physics Fundamentals
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- Assume that the force of a bow on an arrow behaves like the spring force. In aiming the arrow, an archer pulls the bow back 50 cm and holds it in position with a force of 150 N. If the mass of the arrow is 50 g and the “spring” is massless, what is the speed of the arrow immediately after it leaves the bow?arrow_forwardAn electric scooter has a battery capable of supplying 120 Wh of energy. If friction forces and other losses account for 60.0% of the energy usage, what altitude change can a rider achieve when driving in hilly ter-rain if the rider and scooter have a combined weight of 890 N?arrow_forwardHow much energy is lost to a dissipative drag force if a 60-kg person falls at a constant speed for 15 meters?arrow_forward
- A certain automobile engine delivers 2.24 104 W (30.0 hp) to its wheels when moving at a constant speed of 27.0 m/s ( 60 mi/h). What is the resistive force acting on the automobile at that speed?arrow_forwardTwo blocks, A and B (with mass 50.0 kg and 1.00 102 kg, respectively), are connected by a string, as shown in Figure P5.86. The pulley is frictionless and of negligible mass. The coefficient of kinetic friction between block A and the incline is k = 0.250. Determine the change in the kinetic energy of block A as it moves from to , a distance of 20.0 m up the incline (and block B drops downward a distance of 20.0 m) if the system starts from rest. Figure P5.86arrow_forwardIf the skier coasts up the hill, what is his speed (in m/s) when he reaches the top plateau? Assume friction between the snow and skis is negligible.arrow_forward
- (a) Salim who participates in motor race, leaves the end of a ramp with a speed of 90km/hr as in Figure. If his speed is 85.0 km/r when he reaches the peak of the path, 85 km/h what is the maximum height that he reaches? Ignore friction and air resistance. 90 km/h (b) A body of mass 6 kg is acted upon by a force of 5N is moving along a rough floor at a constant speed of 3.5 m/s. Calculate the power consumed in 15 s, and the force of friction acting on the object.arrow_forwardWhat average net force is needed to bring a 1500kg car to rest from a speed of 100km/h within a distance of 55m?.arrow_forwardA 60.0 kg skier with an initial speed of 15 m/s coasts up a 2.50 m high rise as shown in the figure. what is her final speed given the coefficient of friction between her skies and the snow is 0.39arrow_forward
- A 60.0-kg skier with an initial speed of 12.0 m/s coasts up a 2.50-m high rise as shown.Find her final speed at the top, given that the coefficient of friction between her skis andthe snow is 0.80.arrow_forwarda 1.75-kg block at rest on a ramp of height h.When the block is released, it slides without friction to the bottomof the ramp, and then continues across a surface that is frictionlessexcept for a rough patch of width 10.0 cm that has a coefficientof kinetic friction mk = 0.640. Find h such that the block’s speedafter crossing the rough patch is 3.50 m>s.arrow_forwardA 60.0 kg skier with an initial speed of 12.5 m/s coasts up a 2.50 m high rise as shown in the figure. Find her final speed right at the top, in meters per second, given that the coefficient of friction between her skis and the snow is 0.31.arrow_forward
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