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A person pushes with a force of 10.0 N on a stick pin to try to push it into a bulletin board. If the tip of the needle is a circle with a radius of 0.12 mm, then what is the average pressure (in Pascals) on the board at the tip of the pin?
The area of the opening can be calculated from pi (3.1416) times the radius squared. If your pupil is open to a radius of 3.5 mm, explain how much light energy passes through in one minute? Give your answer in mJ.
An open-pit coal mine consumes 71hectares of land, down to a depth of 23m, each year. What volume of earth, in cubic kilometres, is separate in this time.
Find out the force each hand exerts on the shaft when the shaft is rotating in the horizontal plane about its center at 5×10-2 {rm rev/s}.
Suppose a Proton is accelerated through a potential difference of 10 Gigavolts. Determine the proton's final kinetic energy
A person on earth notices a rocket approaching from the right at a speed of 0.83c and another rocket approaching from the left at 0.64c. What is the relative speed between the two rockets
A 1100kg automobile travels at 80km/h. What net work would be required to bring it to a stop
What is the stopping distance when the surface is dry and the coefficient of friction is 0.620.
Two light sources are used in a photoelectric experiment to determine the work function for a particular metal surface. What stopping potential would be observed when using light from a red lamp
Pat (mass 53 kg) and Chris (mass 72 kg) sit in a 26-kg kayak at rest on frictionless water. What's the kayak's speed after Chris catches the pack
The bunchberry flower has the fastest-moving parts ever seen in a plant.at first , the stamen are held by the petals in a bent position, storing elastic energy like a coiled spring.
A block of mass M is at point A on the slope (the slope is just a %u201Cregular roller coaster ride %u201D, What is the velocity at the bottom of the slope at point B which is 5 meters below point A
A basketball player grabbing a rebound jumps 70.80 cm perpendicularly. How much total time (ascent and descent) does the player spend (a) in the top 11.2 cm of this jump and (b) in the bottom 11.20 cm? Do your results describe why such players see..
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