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A diver has a birthmark of area 2.0 cm^2. When the birthmark is 4.0 meters beneath the surface of the pool, what is the contact force exerted by the water on this birthmark?
A railroad car of mass 2.1 104 kg moving at 3.50 m/s collides and couples with two coupled railroad cars, What is the speed of the three coupled cars after the collision
A projectile is launched with initial speed of 60 m/s at an angle of 30 degrees above horizontal. the projectile lands on hillside 4 seconds later. what is velocity at the highest point of trajectory
You are sitting in a wagon and rolling horizontally at 5 m/s when your little sister jumps into your lap as you pass by. Calculate the speed of the wagon after your little sister jumps in
A 9.00 kg point mass and a 15.0 kg point mass are held in place 50.0 cm apart. A particle of mass m is released from a point between the two masses 19.0 cm from the 9.00 kg mass along the line connecting the two fixed masses.
Conservation of Energy A 100kg skier at the top of a 2km high mountain tucks the whole thing but only gets a final speed of 50m/s
A 3.8 kg bucket of water is raised from a well by a rope. The acceleration of gravity is 9.8 m/s2. find the force exerted by the rope on the bucket
The Hall effect can be used to determine the density of mobile electrons in a conductor. Find the density of mobile electrons in the material
An organ pipe open at one end has a length of 60 cm. If the speed of sound in air is 340 m/s, what is the lowest frequency produced by the organ pipe
Under ambient conditions (T=300K ), the intrinsic electron concentration of silicon (Si) is ni=1.45*10^10cm^-3. Calculate the band gap energy of the semiconductor
An RLC circuit has a resistance of 2 komega, a capacitance of 32 uF, and an inductance of 52 H. obtain the phase shift between the current and the voltage
A vertical spring (spring constant =120 N/m) is mounted on the floor. Determine the amplitude at which the block will lose contact with the spring
A spring with a constant k=42.3 N/m has a 2.10 kg mass attached to it. The mass is free to slide on a frictionless track parallel to the spring. What is the total energy in the system
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