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The number of radioactive nuclei present at the start of an experiment is 4.701015. The number present 22 days later is 8.441014. What is the half-life (in days) of the nuclei?
A 10-kg fish is being yanked upward out of the water and the fishing line breaks. If the line is rated to a maximum 200 N tension, then what was the minimum acceleration of the fish? DRAW THE FBD!
A 310g bird flying along at 6.2m/s sees a 8.0g insect heading straight toward it with a speed of 31m/s, What is the bird's speed immediately after swallowing
Ball A is fired straight upward, Ball B is fired straight down, and Ball C is fired horizontally. Rank, from largest to smallest, the speed of each ball at the instant (just before) it collides with the ground.
a two 69 g ice cubes are dropped into 234 g of water in a thermally insulated container. if the water is initially at
A 2.93kg stone is tied to a thin, light wire wrapped around the outer edge of the uniform 9.83kg cylindrical pulley, Find the angular acceleration of the pulley
A piece of machinery with a momentum of inertia of 2.6 kg m2 rotates with a constant angular speed of 4.0radians/second when a frictional torque of 0.56 mN acts on it. What is the net torque acting on the piece
The drawing shows two boxes resting on frictionless ramps. One boxis relatively light and sits on a steep ramp. The other box isheavier and rests on a ramp that is less steep.
Find the coefficient of kinetic friction between a 4.1- block and the horizontal surface on which it rests if an 83 spring must be stretched by 3.0 to pull the block wi`th constant speed. Assume the spring pulls in a direction 15 above the horizontal..
A person of mass 75kg hauls himself off the floor up a vertical rope with an acceleration of 0.68m/s. calculate the tension in the rope
A cylinder is fitted with a piston, beneath which is a spring, How much work does the atmospheric pressure do in compressing the spring
A heat transfer of 9.1 ? 105 J is required to convert a block of ice at -13°C to water at 13°C. What was the mass of the block of ice
A uniform electric field exists in the region among two oppositely charged parallel plates 1.59 cm apart. A proton is released from rest at the surface of the positively charged plate and strikes the surface of the opposite plate in a time interval 1..
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