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A boat, whose speed in still water is 1.70 m/s, must cross a 260m wide river and arrive at a point 110m upstream form where it starts. to do so, the pilot must head the boat at a 45 degree upstream angle. What is the speed of the river's current?
question an air-traffic controller observes two aircraft on his radar screen. the first is at altitude 900 m horizontal
What is the maximum tension. The gastrocnemius muscle, in the back of the leg, has two portions, known as the medial and lateral heads. Assume that they attach to Achilles tendon. The cross-sectional area of each of these two muscles is typically f..
Alan leaves Los Angeles at 8:00 a.m to drive San Francisco, 400 mi away. He travels at a steady 50 mph. find Who gets to San Francisco first
A 8.02 -m ladder with a mass of 21.2 kg lies flat on the ground. A painter grabs the top end of the ladder and pulls straight upward with a force of 260 N. At the instant the top of the ladder leaves the ground, the ladder experiences an angular a..
a ball hung from a vertical spring oscillates in simple harmonic motion with an angular frequency of 2.6 rad/s, What is the maximum acceleration of the ball
A 15.0 kg block of ice at 0 degrees C falls into Lake Superior, which is a freshwater lake. What is the change in entropy, delta S, of the lake
One end of a horizontal rope is attached to a prong of an electrically driven tuning fork that vibrates at a frequency 112 Hz. What is the speed of a transverse wave on the rope
On a frictionless horizontal air table, puck A (with mass 0.246 ) is moving toward puck B (with mass 0.370 ), which is initially at rest. What was the speed of puck A before the collision
A 25 kg projectile is fired by accelerating it with anelectro magnetic rail on the earths surface. The rail makes a 30degree angle with the horizontal, and the guns applies a 1250 Nforce on the projectile for a distance of 7.50 m along the rail.
A 25-g string is streched with a tension of 43.0 N between two fixed points 12.0 m apart. What is the frequency of the second harmonic
a 47.0-kg boy riding a 1.80-kg skateboard at a velocity of 5.40 ms across a level sidewalk jumps forward to leap over a
Find the resulting angular speed of the disk (in rad/s) and describe the direction of rotation.
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