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Q. Two men are carrying a girl on a plank that is 10 m long and weighs 200 N. If the girl weighs 445 N and sits 3 m from one end, how much weight must each man support?
Q. An audience of 1800 fills a concert hall of volume 2.2×104m^3. If there were no ventilation, by how much would the temperature of the air rise over a period of 2.0 h due to the metabolism of the people (70W/person )? Assume the room is initially at 293 K.
A 6.4g lead bullet traveling at 460m/s is stopped by a large tree. If half the kinetic energy of the bullet is transformed into internal energy and remains with the bullet while the other half is transmitted to the tree, what is the increase in te..
An 9.00 {rm kg} point mass and a 15{rm kg} point mass are held in place 50{rm cm} apart. A particle of mass m is released from a point between the two masses 19{rm cm} from the 9{rm kg} mass along line connecting the two fixed masses.
The side-view mirror of an automobile has a radius of curvature of 20cm. The mirror produces a virtual image one-third the size of the object. How far is the object from mirror.
The ball has the speed of 12.1 m/s and is moving in a direction of 33.4 degrees east of north, relative to the ground.
A force F = 200i - 400j + FZ k N, is acting through point A(0,0,0) m.
David is driving a steady 28.0m/s while he passes Tina, who is sitting in her car at rest. Tina begins to accelerate at a steady 2.70 at the instant when David passes. How far does Tina drive before passing David.
How many 104W lightbulbs can you use in a 113 V circuit without tripping a 17 A circuit breaker? (The bulbs are connected in parallel that means that the potential difference across each lightbulb is 113V.)
In what direction should the pilot travel in this direct flight. Find out the distance she walks.
An average temperature of the rest of the universe
The length of an air column that produces a strong resonance in a cylinder is 0.18m, what is the frequency of the tuning fork being used .
Will the car hit the barricade
A force of k is applied to an object for a small fraction of a second, t_k, less than the duration of one frame, t_f. Our simulation doesn't support applying forces for less than an entire frame, so if we wanted to simulate the effect of force k over..
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