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An 34-kg person puts on a life jacket, jumps into the water, and floats. The jacket has a volume of 3.4 10-2 m3 and is completely submerged under the water. The volume of the person's body that is under water is 6.4 10-2 m3. What is the density of the life jacket?
Light impinges on a 1485 line per mm diffraction grating at an angle of incidence of 39.5 degrees. What wavelength, in nm, will be reflected in the first order at an angle of 14 degrees on the other side of the normal to the grating.
A 54.0 kg skateboarder wants to just make it to the upper edge of a "quarter pipe," a track that is one-quarter of a circle with a radius of 3m. What speed does he need at the bottom?
Two 5.0-cm-diameter metal disks separated by a0.61-mm-thick piece of Pyrex glass are charged to a potential difference of 1300V. What is the surface charge density on the glass
Four stars with equal masses m=1.99×1030 kg are located at the corners of a square, What is the magnitude of the net force on the star at the origin
A closed system consists of 4 objects. Initially, object A has 137 J of energy, object B has 158 J of energy, object C has 127 J of energy, How much energy does object D have
An electron has an initial, vertical velocity v0, y=.0001 c when it enters a uniform, horizontal electric field, E=0.5 x (x hat). how far will the electron be deflected
A parallel-plate capacitor has an area of 0.12 m^2 and a separation of 1.2 cm. A battery charges the plates to a potential difference of 120V and is then disconnected. A dielectric slab of thickness 4.0 mm and dielectric constant 4.8 is then place..
Suppose instead the car hits a concrete abutment at full speed and is brought to a stop in 2.00 m. Calculate the force exerted on the car
A long solenoid of length 7.0 x 10^-2 meters and cross-sectional area of 4.0 x 10^-5 meters^2 contains 6200 turns per meter. Find the energy stored in the solenoid after 3 seconds
A room has dimensions 2.84 m (height) × 4.91 m × 6.79 m. A fly starting at one corner flies around, ending up at the diagonally opposite corner. What is the magnitude of its displacement
Two electrons are located at two of the vertices of an equilateral triangle, one at each vertex. The length of one side of the triangle is 1.00 nm. What is the net electric field at the third vertex
A 769-kg satellite is in circular orbit around the Earth and moving at a speed of 1.11 km/s. How much work must be done to move the satellite
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