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A woman on a bridge 90.0 m high sees a raft floating at aconstant speed on the river below. She drops a stone fromrest in an attempt to hit the raft. The stone is releasedwehn the raft has 6.00 m more to travel before passing under thebridge. The stone hits the water 2.00 m in front of theraft. Find the speed of the raft.
A cylinderical water tank of radius 10ft and height 30ft is half filled with water. How much work is essential to pump all of the water out through a hole in the top of tank.
A roller-coaster car has a mass of 504 kg when fully loaded with passengers point A, what is the force exerted by the track on the car at this point
A toaster operating on 120 V uses a current of 15.0 A. What is the toaster's power consumption, what is the cost of using the toaster for 3.2 min
Consider a concave mirror with a focal length of 18.90 cm. Find the location of the image when the object is 10.20 cm from the mirror. What is the magnification of the image? What is the radius of curvature of the mirror in cm? Is is virtual and u..
A trap door, of length and width 2.35 m, is held open at an angle of 65.0° with respect to the floor. what is the torque exerted on the trap door by the rope
A 1000 car pushes a 2000 truck that has a dead battery. What is the magnitude of the force of the truck on the car
Beams of high-speed protons can be produced in "guns" using electric fields to accelerate the protons. (a)What acceleration would a proton experience if the gun's electricfield were 2.18 x 104 N/C?
An alpha particle is a helium nucleus and therefore consists of two protons and two neutrons. How much time passes before the alpha particle comes to rest
Light behaves primarily as a particle when it ...
Betelgeuse has a radius R= 500R(sun) and a surface temperature of T= 2500 K and has an apparent magnitude of m=0.5. How far away is Betelgeuse in parsecs
The coefficient of kinetic friction for wood sliding on wood is 0.20. What is the final speed of the bullet
question1two charged pith balls are suspended on extremely light 102 strings. each has a mass 10g. in stability the
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