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Q. A 250.0 gram industrial mold absorbs 5,575 calories of heat when it is filled with an alloy. If the specific heat of the mold is 0.275 calories per gram degree Celsius, how much does its temperature rise?
Q. An artillery shell is fired with an initial velocity of 300 m/s at 51.0° above the horizontal. To clear an avalanche, it explodes on a mountainside 47.0 s after firing. What are the x and y coordinates of the shell where it explodes, relative to its firing point?
A dart is thrown horizontally toward the bull's-eye, point P on the (non-standard size) dart board in the figure, with an initial speed of 8.9 m/s. It hits at point Q on the rim, vertically below P 0.14 s later. What is the distance PQ? How far aw..
A person wearing a seat belt can withstand an acceleration of -310m/s squared. How thick should barriers be to carefully stop a car that hits a barrier at 120km/h.
A 100-kg halfback running north with a speed of 12 m/s is tackled by a 110-kg opponent running south with a speed of 4.0 m/s. If collision is completely inelastic and head-on, compute the speed of the players just after the tackle.
Two circus performers, Jack and Jill, whose total mass is 120 kg, start a swing which is 5 m long such that initially the rope attached to their swing makes an angle of 36 degrees with the horizontal.
What is diameter of the circle
find out the average force exerted on the bullet by the expanding gases as the bullet moves through the length of the 50 cm barrel.
A bead slides without friction around a loop- the-loop. The bead is released from a height of 24.7 m from the bottom of the loop-the- loop which has a radius 9 m.
A long solenoid has 80 turns/cm and carries current i. An electron moves within the solenoid in the circle of radius 3.10 cm perpendicular to the solenoid axis. The speed of an electron is 0.0330c (c = speed of light). Find current i.
The loaded cab of an elevator has a mass of 3.7 x 10^3 kg and moves 228 m up the shaft in 21 s at constant speed. At what average rate does the force from the cable do work on the cab.
A shopper pushes a cart 44- m south down one aisle and then turns 90.0° west and moves 30 m. He then makes another 90° turn and moves 13 m.
Fairgoers ride a Ferris wheel with a radius of 4.35m, the bottom of which is 1.75m from the ground. The wheel completes one revolution every 30s. A passenger drops his keys when he is three quarters of the way up and at the 10 o'clock position. Wh..
A person weighs 670N steps onto a spring scale in the bathroom, and the spring compresses by 0.79 cm. What is the spring constant? And what is the weight of another person who compresses the spring by 0.34 cm.
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