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Hoover Dam was built in the 1930s to provide electricity for the southwest U.S. and to prevent the wild Colorado River from flooding. Hoover Dam is about 380 m wide and is about 221 m high. Assume that Hoover Dam can be approximated by slab geometry with a width of 380 m (W). What is the total force (newtons) on the dam face if the water level from Lake Mead (holding basin for Hoover Dam) is 212 m? Assume the density of water in Lake Mead is 1000 kg/m3. (Hint: you should be able to do this problem without doing an integral. Ask yourself, how does pressure vary with depth along the wall of the dam? Therefore, at what depth will the pressure equal its average over the whole face of the dam?)
A 2.50-g bullet travelling at a speed of 425 m/s, strikes the wooden block of a ballistic pendulum, such as that Figure in 7.12. The block has a mass of 215 g. Calculate the speed of the bullet/block combination quickly after the collision.
Guess scale factor of the Universe
Snowboarder Sherry of mass m is pulled up a slope at constant velocity v by a tow bar. The force of the tow bar is parallel to the slope, which is inclined at (theta) with respect to the horizontal. The coefficient of kinetic friction between the ..
What is the magnitude of the second charge.
In a friendly game of handball, you hit the ball essentially at ground level, How high is the ball when it hits the wall
A 0.160-kg baseball traveling 30.0m/s strikes the catcher's mitt, which, in bringing the ball to rest, recoils backward 11.0cm . What was the magnitude of the average force applied by the ball on the glove?
A delivery truck travels 29 blocks north, 18 blocks east, and 26 blocks south. Assume the blocks are equal length. What is the magnitude of its final displacement from the origin
A motorist travelling at 17m/s encounters a deer in the road 49m ahead. If the maximum acceleration the vehicle's brakes are capable of is -7 m/s2. If his or her reaction time is 1.9987 s, how fast will (s) he be travelling when (s) he reaches dee..
If his arms are capable of exerting a force of 1400 on the vine, what is the maximum speed he can tolerate at the lowest point of his swing? His mass is 82, and the vine is 6.00 long.
A 100 g bullet is shot into a 1 kg sphere of wood, where it sticks. What is maximum initial speed the projectile can have
A hanging block A ( Ma = 15 kg) is connected by a light cable and a pulley wheel to a second block B ( Mb = 10 kg) situated at the bottom of a frictionless inclined plane with angle %u03B8 = 30o to the horizontal
A 23-g bullet traveling 270m/s penetrates a 2.2kgblock of wood and emerges cleanly at 215m/s. how fast does it move after the bullet emerges
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