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a 5.0m long ladder leans agaisnt a wall, touching it at a point 3.8 above the ground. the ladder is uniform with a mass of 15kg. the was is frictionless.
A) what is the vertical normal force acting on the ladder?
B) what is the horizontal normal force acting on the ladder?
C) what is the minimum coefficient of friction between the ladder and floor?
Two dogs pull horizontally on ropes attached to a post; the angle between the ropes is 58.0?. Dog A exerts a force of 260N , and dog B exerts a force of 320N
two gliders on a level air track approach each other. One glider has a mass m1= 0.6 kg and a velocity v1= +4 m/s. Calculate the velocity of the joined gliders
A diffraction grating with 700 lines per centimeter is illuminated by a He-Ne laser of wavelength 633 nm. What is the highest order of diffraction that could be observed with this grating?
A metal wire has a resistance of 8.00 at a temperature of 20°C. If the same wire has a resistance of 10.85 at 90°C, what is the resistance of the wire when its temperature is -20°C
a 9.5-uC charge is at x = 15 cm, y = 5.0 cm and a -3.2-uC charge is at x = 4.4 cm, y = 11 cm. Find the force on the negative charge
You have been asked to design a "ballistic spring system" to measure the speed of bullets. Find an expression for the bullet's speed
A 60.0g ice cube can slide without friction up and down a 33.0 slope. what distance will it travel up the slope before reversing direction
A 4.00kg block slides down a frictionless inclined plane with an acceleration 3.00,/s^2. What is the angle of the incline above the horizontal
A certain light-bulb has a tungsten filament. It has a power of 100 W when attached to 120 V potential difference. Calculate the resistance of the filament
The longest recorded pass in an NFL game traveled 86 yards in the air from the quarterback to the receiver.Assuming that the pass was thrown at the optimal 45 angle, what was speed at which the ball left the quarterback's hand.
The mass has a kinetic energy of 17.0 J as it passes through its equilibrium position (the point at which the spring force is zero). At what rate is the spring doing work on the mass
During an all-night cram session, a student heats up a 0.836 liter (0.836 x 10- 3 m3) glass (Pyrex) beaker of cold coffee. How much coffee (in cubic meters) has spilled out of the beaker
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