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Q. Suppose that a large cargo truck needs to cross a bridge. The truck is 30 m long and 3.2 m wide. The cargo exerts a force of 54,000 N. The bridge can only withstand 450 Pa of pressure. Is it safe for the truck to cross the bridge?
Q. A movie stuntwoman drops from a helicopter that is 29.0 above the ground and is moving with a constant velocity whose components are 8.00 upward and 18.0 horizontal and toward the south. You can ignore air resistance.Where on the ground (relative to the position of the helicopter when she drops) should the stuntwoman have placed the foam mats that break her fall?
A helicopter is ascending vertically with a speed of 5.57. At a height of 124 above the Earth, package is dropped from a window. How much time does it take for the package to reach the ground?
What minimum force requires for door to hold it open
The coefficients of friction for plastic on wood are μs = 0.50 and μk = 0.40. How much horizontal force would you want to apply to a 4.0-lb plastic calculator to start it moving from rest.
The period of oscillation of an object in a frictionless tunnel running through the Earth is 84.3 min. What is the time of oscillation of an object in a similar tunnel on the Moon.
What is an average power output of the laser. What is the rms value of the electric field in the beam.
What is the speed of the block of clay right after the collision. What impulse does the clay exert on the block.
A skier is accelerating down a 30 degree hill at 3.60 m/s^2. How long would it take her to reach the bottom of the hill, assume she starts from rest and accelerates uniformly, if elevation change is 170m.
A pressure of 10 Pa is applied through a piston uniformly on the surface of water in a cylinder. How much of this pressure if it is 80 cm deep?
Find the distance from the mirror to the point where the reflected rays meet.
Two people stand 3 m in front of large plane mirror and space 5m a part in dark room at what angle of incidence should one of them shine a flashlight on the mirror so that reflected beam directly strickes the other person.
Find out the least compression of the spring
A particular organ pipe can resonate at 213 Hz, 355 Hz, and 497 Hz, but not at any other frequencies in between. What is the fundamental frequency of pipe.
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