The force exerted by the wind on a sailboat is approximately perpendicular 10 the sail and proportional to the component of the wind velocity perpendicular to the sail. For the 800-kg sailboat shown in Figure P4.58. the force exerted by the wind on the sailboat is F soil = ( 550 N m/s ) v wind Water exerts a force along the keel (bottom) of the boat that prevents it from moving sideways, as shown in the figure Once the boat starts moving forward, water also exerts a drag force backwards on the boat, opposing the forward motion. If a 17-knot wind (1 knot = 0.514 m/s) is blowing to the east, what is the initial acceleration of the sailboat? Figure P 4.58
The force exerted by the wind on a sailboat is approximately perpendicular 10 the sail and proportional to the component of the wind velocity perpendicular to the sail. For the 800-kg sailboat shown in Figure P4.58. the force exerted by the wind on the sailboat is F soil = ( 550 N m/s ) v wind Water exerts a force along the keel (bottom) of the boat that prevents it from moving sideways, as shown in the figure Once the boat starts moving forward, water also exerts a drag force backwards on the boat, opposing the forward motion. If a 17-knot wind (1 knot = 0.514 m/s) is blowing to the east, what is the initial acceleration of the sailboat? Figure P 4.58
Solution Summary: The author calculates the force exerted by the wind component on the sailboat.
The force exerted by the wind on a sailboat is approximately perpendicular 10 the sail and proportional to the component of the wind velocity perpendicular to the sail. For the 800-kg sailboat shown in Figure P4.58. the force exerted by the wind on the sailboat is
F
soil
=
(
550
N
m/s
)
v
wind
Water exerts a force along the keel (bottom) of the boat that prevents it from moving sideways, as shown in the figure Once the boat starts moving forward, water also exerts a drag force backwards on the boat, opposing the forward motion. If a 17-knot wind (1 knot = 0.514 m/s) is blowing to the east, what is the initial acceleration of the sailboat?
Consider a rock thrown off a bridge of height 73.4 m at an angle θ = 25° with respect to the horizontal as shown in Figure P4.20. The initial speed of the rock is 10.9 m/s. Find the following quantities:
(a) the maximum height reached by the rock
(b) the time it takes the rock to reach its maximum height
(c) the time at which the rock lands
(d) how far horizontally from the bridge the rock lands
(e) the velocity of the rock (magnitude and direction) just before it lands.
magnitude
(f) direction: Give your answer in degrees. If you think the answer is "20 degrees down from the positive x-axis", you would enter "-20" (note the negative sign!)
The masses m1and m2shown in the figure are tied to eachother by a rope over a frictionless pulley. While the mass m1rotates in the horizontal plane, the mass m2staysat rest. Neglect the mass of the pulley and the rope. (m1= 4 kg, m2= 5 kg, L = 2 m)a) Find the tension in the rope.b) Find angle c) Find the velocity of the mass m1.
In a movie, a stuntman places himself on the vertical front of a truck as the truck accelerates. The coefficient of static friction between the stuntman and the truck is 0.370. The stuntman is not standing on anything but can “stick” to the front of the truck as long as the truck continues to accelerate. What minimum forward acceleration will keep the stuntman on the front of the truck?
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