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The right figure shows a force of magnitude F = 12.0 N applied to an 8.00 kg block at a downward angle of ? = 30.0°. The coefficient of static friction between block and floor is ?s = 0.700; the coefficient of kinetic friction is ?k = 0.400. Does the block begin to slide or does it remain stationary? What is the magnitude of the frictional force on the block?
The coefficient of performance of a refrigerator is defined as the ratio of heat extracted, At what rate will this refrigerator deliver heat to the room in which it is operating when it is running
An ideal gas initially at 20°C and 199 kPa has a volume of 3.40 L. It undergoes a quasi-static, isothermal expansion until its pressure is reduced to 94 kPa. (a) Find the work done by the gas. J (b) Find the heat added to the gas during the expans..
An open-pit coal mine consumes 71hectares of land, down to a depth of 23m, each year. What volume of earth, in cubic kilometres, is separate in this time.
Levy flights- consider a random walk of N steps in one-dimension. suppose that the steps are completely uncorrelated, and that the distribution of step size a is given by phi(a)= k*1/(1+abs(a)^alpha).
A heat engine having an ideal monatomic gas as a working substance has a cycle consisting of the following three processes: isobaric expansion at 200 kPa.
A 1700 kg car travelling at a speed of 15m/s skids to a halt on wet concrete where f_k =.5. How long is the cars skid marks.
When a-particles with energy of 5MeV are scattered on a thin gold foil, it is found that 10,000 a-particles are scattered at an angle greater than 50o, How many will be scattered between 70o and 80o
Illustrate what are the velocities of the two people after the snowball is exchanged? Disregard the friction between the skates and the ice.
The person in the drawing is standing on crutches. Assume that the force exerted on each crutch by the ground is directed along the crutch, determine the largest angle
If 54 J of work are needed to stretch a spring from 15 cm to 21 cm and 90 J are needed to stretch it from 21 cm to 27 cm, what is the natural length of the spring
A child runs down a 10 degree hill and then suddenly jumps upward at a 17 degree angle above horizontal and lands 1.5 m down the hill as measured along the hill. what was the initial speed?
Two negative, equally charged drops of water, 0.80 mm apart, exert an electrostatic force of 78.5 x 10-9 N on each other. Determine the net charge on each drop. Give your answer in the form "a.bc" pico-Coulombs.
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