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Two children push on opposite sides of a door during play. Both push horizontally and perpendicular to the door. One child pushes with a force of 17.5 N at a distance of 0.600 m from the hinges, and the second child pushes at a distance of 0.450 m. What force must the second child exert to keep the door from moving? Assume friction is negligible. [23.3Nm]
During a car crash a 65 kg person's head goes from travelling at 50 km ??!??to stationary in 0.15 s. What is the magnitude of the average net force acting on the person's 4.5 kg head
A certain automobile manufacturer claims that its super-deluxe sports car will accelerate from rest to a speed of 39.6 m/s in 7.73 s. Find the acceleration of the car
Determine support reactions and forces in the springs when the assembly is forced to close the gap g, as shown in the Figure.
A 2.03 kg book is placed on a flat desk. Suppose the coefficient of static friction between the book and the desk is 0.602 and the coefficient of kinetic friction is 0.327. How much force is needed to begin moving the book
The active element of a certain laser is an ordinary glass rod 21.6 cm long and 1.22 cm in diameter. Calculate its increase in diameter
You are in charge of regulating the temperature of the swimming pool for the next Olympic games. The water in the pool fills a volume of 25 m x 50m x 2m and the water should be kept between 25 and 27 degrees Celsius. how much ice ( in kg) will you ..
question if a force of 10 n is needed to open an 100 cm wide door when applied at the edge opposite the hinges what
A closed hollow sphere of radius R=60.0cm (the surface area of asphere of radius R is 4πR^2) is made of styrofoam havingthermal conductivity k=0.0450 watt/m celsius, find the thickness(assumed uniform) of the styrofoam wall of thehollow sphere
A 1.00×104kg railroad car is rolling at 3.00m/swhen a 7000kg load of gravel is suddenly dropped in. What is the car's speed just after the gravel is loaded
A 25 kg suitcase is being pulled with constant speed by a handle that is at an angle of 22 degrees above the horizontal. what is the force F applied to the handle
Point charges of 72 Q are placed at each corner of an equilateral triangle, which has sides of length 8 L. What is the magnitude of the electric field at the mid-point of any of the three sides of the triangle in units of kQ/L2?
A parallel-plate capacitor is charged to a potential difference of 12 V. The area on each plate is 20 cm2 andthe spacing between plates is 0.15 mm. Find thef ollowing: the electric field between the two plates. the total charge on each plate.
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