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An 30-kg person puts on a life jacket, jumps into the water, and floats. The jacket has a volume of 2.8x10^(-2) m^3 and is completely submerged under the water. The volume of the person's body that is under water is 5.9x10^(-2) m^3. What is the density of the life jacket?
Light in air enters a diamond (n= 2.42) at an angle of incidence of 48 degrees. What is the angle of refraction inside the diamond
A block slides down an inclined plane, starting from rest and being pushed with a constant acceleration of 4.60 m/s2 over a distance of 19.4 cm. Find the total time the block is in motion
A 45.0-kg girl is standing on a 158-kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. What is the velocity of the plank relative to the surface of ice
A disk released from the top of an inclined plane has a speed of 6.32 m/s at the bottom. How high is the upper end of the inclined plane
A projectile is fired with an initial speed of 164 m/s. Find the angle of projection such that the maximum height of the projectile is equal to 0.5 times its horizontal range
A ball of mass 0.65 kg is fired with velocity 120 m/s into the barrel of a spring gun of mass 2.4 kg initially at rest on a frictionless surface. What fraction of the ball's initial kinetic energy is stored in the spring
A 6V battery is connected in series with a 1.5V flashlight. what possible terminal voltages are available
90 grams of water at 80°C are mixed with an equal amount of water at 20°C in a completely insulated container. The final temperature of the water is 50°C. How much heat is lost by the hot water
A ball is thrown upward at a speed v0 at an angle of 50.0° above the horizontal. It reaches a maximum height of 7.5 m. How high would this ball go if it were thrown straight upward at speed v0.
A 55-kg man holds a weight of 20 kg on his head. what is the work done by him against gravity if he moves a distance of 20 m (1) on a horizontal road, (2) on an incline of 1 in 5 ? take g = 10 m/s.s
A 362 g object is attached to a spring and executes simple harmonic motion with the period of 0.200 s. If the total energy of the system is 6.71 J.
A 60 kg car moving towards the right at 5 m/s collides head on with an 50 kg car moving towards the left at 6 m/s, find the velocity of the combined bodies
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