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A hydraulic cylinder with a radius of 0.0281 m has a piston on the left end and a safety valve at the right end. The safety valve is a circular opening with a radius of 0.00650m, sealed with a disk. The disk is held in place by a spring (spring constant = 885 N/m) that is compressed 0.0100 m from its unstrained length. What is the magnitude of the minimum force that must be exerted on the piston in order to open the safety valve?
A car moving at 36 m/s passes a stationary police car whose siren has a frequency of 500 hz. What is the change in the frequency (in Hz) heard by an observer
A person looks horizontally at the edge of a swimming pool. If its length is 5.00m, and the pool is filled to the surface, to what depth (in m) could observer see? For water is 1.33).
Two negative point charges are separated by 11.0cm and feel a mutual repulsive force of 1.85?N . The charge of one is three times that of the other. How much charge does each have? in nanocoulumbs
At room temperature what is the strength of the electric field in a 6-gauge copper wire (diameter 4.12 mm) that is needed to cause a 1.73-A current to flow?
Object O1 is 14.5 cm to the left of a converging lens with a 12.0-cm focal length. What is the focal length of the second lens
What is the mean number density of galaxies within the half mass radius? Suppose the typical physical cross section of a galaxy is 10^-3 Mpc^2
An Escort and a Camaro traveling at right angles collide and stick together. What was the speed of the Camaro
A speeder passes a parked police car at 30 m/s. At that instant, the police car starts from rest with a uniform acceleration of 2.44 m/s2.
A small object of mass 2.00×10?2kg and charge 3.0uC hangs from the ceiling by a thread. obtain the tension in the thread
the earth takes slightly less than one day to complete one rotation about the axis passing through its poles. what is the angular speed of the earth about its axis
an irregular object is suspended by a wire from its center. when a torque of .14 N.m is applied, to the object, find the inertia of the object
The light shining on a diffraction grating has a wavelength of 457 nm (in vacuum). How many lines per centimeter does the grating have
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