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A 10 kilogram block of southern pine 30 centimeter on a side is held submerged under water. Find what force is required to do this?
A certain automobile engine delivers 2.24 104 W (30.0 hp) to its wheels when moving at a constant speed of 21.0 m/s ( 47 mi/h). What is the resistive force acting on the automobile at that speed?
A nickel crystal is used as a diffraction grating for x-rays. Then the same crystal is used to diffract electrons. what is the kinetic energy of each electron
A plane, diving with constant speed at an angle of 54.0° with the vertical, releases a projectile at an altitude of 890 m. The projectile hits the ground 6.00 s after release. What is the speed of the aircraft
Assume unpolarized light of intensity 197 W/m2 falls on the polarizer in the figure, and the angle in the drawing is 37.0°. What is the light intensity reaching the photocell?
Tarzan has a mass of 75.0 kg and is swinging on a vine that is 8.00meters long. What is the maximum speed at which he can swing if the maximum tension the vine can with stand is 1000 N?
A humorous scene in Akira Kurosawa's classic film The Seven Samurai shows the young samurai Kikuchiyo wading into a small stream and plucking a fish from it for his dinner.
a uniform electric field of magnitude 325 vm is directed in the negative y direction. the coordinates of point a are
A spherical balloon is made from a material whose mass is 3.86 kg. The thickness of the material is negligible compared to the 2.16-m radius of the balloon. Find the absolute pressure of the helium gas
A 3.1 kg dog stands on a 15.00 kg flatboat at distance D = 6.1 m from the shore. It walks 2.00 m along the boat toward shore and then stops. Assume no friction between the boat and the water, find how far the dog is then from the shore.
A small boat is moving at a velocity of 2.95 m/s when it is accelerated by a river current perpendicular to the initial direction of motion. what will the new velocity of the boat be after 29.5 s
A man drags a 76-kg crate across the floor at a constant velocity by pulling on a strap attached to the bottom of the crate. The crate is tilted 25° above the horizontal, and the strap is inclined 61° above the horizontal.
a computer disk drive spins at 7200 rpm when a brief 30 second power outage occurs. during this time the drive slows
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