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A solid concrete block weighs 250 N and is resting on the ground. Its dimensions are 0.400 m x 0.190 m x 0.0880 m. A number of identical blocks are stacked on top of this one. What is the smallest number of whole bricks (including the one on the ground) that can be stacked so that their weight creates a pressure of at least two atmospheres on the ground beneath the first block?
Light from a laser beam with a wavelength of 600 nm passes through a narrow single slit and observed on a screen 1.5 m behind the slit. The first minimum of the diffraction pattern is 1.5 cm from the central maximum. How wide is the slit?
A flat sheet is in the shape of a rectangle with sides of lengths 0.400m and 0.600m. Find the magnitude of the electric flux through the sheet
A 1000 kg aircraft going 25 m/s collides with a 1500 kg aircraft that is parked and they stick together after the collision. how far did they skid
Three small spheres, each have a charge of 3.60 %u03BCC, are arranged in a line, with sphere 2 in the middle. Adjacent spheres are initially 8.70 cm apart. What is the speed of each sphere when they are far apart
Water flows straight down from an open faucet. The cross-sectional area of the faucet is 2.00 x10-4 m2, and the speed of the water is 0.87m/s as it leaves the faucet.
A spaceship is measured to be 158 m long while at rest relative to the observer. what length does the observer measure
You and your friends find a rope that hangs down 18m from a high tree branch right at the edge of a wide river. How long must you hang on if you want to stay dry
You drop a stone into a deep well and hear it hit the bottom 2.60 s later. This is the time it takes for the stone to fall to the bottom of the well.
A person swimming underwater sees a lifeguard who is standing in the shallow part of the pool; the water comes up to the lifeguard's waist. In what way does the swimmer see lifeguard's upper body distorted.
If the electric field strength in air exceeds 3.0 multiplied by 106 N/C, the air becomes a conductor. Using this fact, determine the maximum amount of charge that can be carried by a metal sphere 3.1 m in radius.
The isotope 15N undergoes radioactive decay to form 15C. What charged particle is emitted in the decay process? how much kinetic energy in MeV is given to the particle
A cancer patient is undergoing radiation therapy in which protons with an energy of 1.2 MeV are incident on a 0.25 Kg tumour. How many protons are absorbed by the tumour
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