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A force of 720 Newton stretches a certain spring a distance of 15 centimeter. Find what is its force constant? If a 60 kilogram mass is hung on it, find how far will it stretch?
An 85-g arrow is red from a bow whose string exerts a constant force of 105 N on the arrow over a distance of 75 cm. Illustrate what is the speed of the arrow as it leaves the bow?
Three +3.0-?C point charges are at the three corners of a square of side 0.50 m. Find the magnitude of the electric field at the center of the square
a 15.0 tank contains 0.209 of helium at 23.0. the molar mass of helium is 4.00 .how many moles of helium are in the
How much is the time measured by an astronaut in a spaceship for a class on the Earth that lasts for one hour (the time measured on the Earth),
A cannon tilted up at a 30° angle fires a cannon ball at 80 m/s from atop a 18 m high fortress wall. What is the ball's impact speed on the ground below
The position of a particle is given in cm by x = (5) cos 5?t, where t is in seconds. Find the maximum acceleration of the particle
While visiting Planet Physics, you toss a rock straight up at 11m/s and catch it 2.7s later. While you visit the surface, What is the mass of Planet Physics
What does it means when I say that a light truck and a heavy truck have the same momentum, What is renewable energy
A symmetric double convex lens with a focal length of 25.0cm is to be made from glass with an index of refraction of 1.53. What should be the radius of curvature for each surface
Describe briefly a current health problem. A father racing his son has half the kinetic energy of the son, who has one-third the mass of the father. The father speeds up by 2.5 m/s and then has the same kinetic energy as the son.
A constant-volume gas thermometer reads 50.0 torr at the triple point of water. What ideal-gas temperature corresponds to a pressure of 678 torr
The drawing shows two boxes resting on frictionless ramps. Onebox is relatively light and sits on a steep ramp. The other box isheavier and rests on a ramp that is less steep. The boxes arereleased from rest at A and allowed to slide down the ramp..
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