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A uniform plank the length of 6.1 m, weight of 445 N rests on the ground and a frictionless roller at the top of a wall 3.05 m high. The plank is in equilibrium at any value of θ greater than or equal to 70 degrees but slips if θ is < 70 degrees. Discover the coefficient of friction among the plank and the ground. Utilize the point of origin for forces about the point where the ground and the plank meet.
two uniform solid cylinders each rotating about its central longitudinal axis have the same mass of 4.90 kg and rotate
A ray of light strikes the midpoint of one face of an equiangular (60°-60°-60°) glass prism (n = 1.5) at an angle of incidence of 32.5°. find the angles of reflection at the surfaces
A boy of mass 60.8 kg is rescued from a hotel fire by leaping into a firefighters' net. The window from which he leapt was 9.5 m above the net. What is the average force on the net due to the boy during the interval
What are the two types of errors one encounters in experiments? Give an example of each, What does standard deviation of measured data tell you
You have a spherical mirror with a radius of curvature of+15cm (so it is concave facing you). You are looking at an object whose size you want totriplein the image, so you can see it better. Where should you put the object? Where will the image be? W..
consider a uranium nucleus to be a sphere of radius r 7.4x10-15m with a charge of 92e distributed uniformly throughout
An amount of an ideal monatomic gas has an initial pressure of 210 kPa, an initial volume of 1.2x10-3 m3, at an initial temperature of 350 K. The gas now undergoes three processes:
A divers lungs hold 0.0050 m^3 of air at sea level, where the pressure is 101.3 kPa. what is the volume of the air in his lungs at a depth of 3 m
A 15 kg block is on a ramp which is inclined at 20° above the horizontal. It is connected by a string to a 28 kg mass which hangs over the top edge of the ramp. Assuming that frictional forces may be neglected, what is the magnitude of the accelerati..
A 0.70 kg ball is moving horizontally with a speed of 5.1 m/s when it strikes a vertical wall. What is the magnitude of the impulse of the ball
An unstable high-energy particle enters a detector and leaves a track 1.09 mm long before it decays. Its speed relative to the detector was 0.992c. What is its proper lifetime? That is, how long would the particle have lasted before decay had it been..
a basketball player who is 2 m tall is standing on the floor 10 m from the basket. If he shoots the ball at a 40.0 degree angle with the horizontal, at what initial speed should he throw so that is goes through the hoop without striking the backbo..
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