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A 500 N woman stands in the middle of a frozen lake of radius lOOm. The ice is frictionless so she can't walk. She decides to sacrifice one of her 0.5 kg shoes and throws it horizontally at 5 m/s. How long does it take her to reach the shore?
A square coil of wire of side 3.00 cm is placed in a uniform magnetic field of magnitude 2.50 T directed into the page, find the average current induced in the coil during this rotation
A rock is thrown with initial velocity of 10 m/s and falls 50 m from the base of the cliff. how far away from the base of the cliff does the rock land
A cosmic ray particle has a mass in its own rest frame of 100MeV. What would be the apparent mass in the observers frame if it were travelling at 0.99c
Calculate the minimum excitation energies of (a) the 33 kHz quartz crystal of a watch, (b) the bond between two O atoms in O2, for which k= 1177 N m-1.
A sonar signal of frequency 1.00 x 106 Hz has a wavelength of 1.50 mm in water. What is its period in air? What is its period in water? What is the speed of the signal in water?
Two masses M1 = 10 kilogram and M2 = 8 kilogram are accelerated by a force of 60 Newton at an angle of 53o above the horizontal. Find what is the tension in the rope between the masses
A cylindrical copper rod of length 2.2 m and a cross-sectional area 5.0cm^2 is insulated to prevent heat loss through its surface. At what rate is energy conducted along the rod
A hollow, conducting sphere with an outer radius of 0.254m and an inner radius of 0.199m has a uniform surface charge density of +6.18 × 106 C/m2. What is the new charge density on the outside of the sphere
A piece of metal, when weighed in air has a weight of 20.7 newtons. When completely submerged in blood( density of blood=1060kg/m^3) the metal has a weight of 12.7 newtons. What is the density of the the metal
If a satellite is placed in orbit about the earth at adistance 2.7 times the earth's radius, what will its velocity be? How many days will it take to circle the earth
A capacitor can be made from two sheets of aluminium foil separated with a sheet of waxed paper. If the sheets of aluminium are 0.30 m by 0.32 m and the waxed paper, of slightly larger dimensions, is of thickness 0.030 mm and dielectric constant = 2...
A fixed system of charges exerts a force of magnitude 16 N on a 8 C charge. The 8 C charge is replaced with a 9 C charge. What is the exact magnitude of the force (in N) exerted with the system of charges on the 9 C charge?
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