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Your 85-kg friend (modeled in the picture as a box) is a window-washer and leans a ladder against a large frictionless window. The bottom of the ladder is on rough cement. The ladder is 12.0 m long and is heavier at the bottom; its center of mass is 4.0 m from the lower end, and it is 45 kg. It makes an angle of 60.0 degrees relative to the floor. Your friend is 9.0 m from the bottom of the ladder.
a) What is the force from the wall on the ladder?
b) What is the normal force from the floor on the ladder?
c) What is the friction force from the floor on the ladder?
d) What is the minimum coefficient of static friction between the ladder and the floor if the ladder is not to slide out from under your friend?
A He-Ne laser beam with an intensity of 1.00 103 W/m2 is incident from air to dense flint, Find the intensity of the beam transmitted into the dense flint
A 2700 kg truck traveling north at 42 km/h turns east and accelerates to 53 km/h. What is the change in the truck's kinetic energy
A 8.5 omegacap.gif resistor and a 5.9 omegacap.gif resistor are connected in series with a battery. Find the potential difference across the battery
A person carries a long pole of mass 20 kg and length 3.4 m at the angle of 60 degrees. Find the magnitude of the torque on the pole due to gravity.
In an RLC circuit, the following three elements are connected in series: a resistor of 31.0 ohm, a 22.2-mH inductor, and a 0.390-µF capacitor. Find the power factor for the RLC series circuit
A 5.4-µC point charge is located at x = 0.9 m, y = 3.3 m, and a -3.9-µC point charge is located at x = 1.9 m, y = -1.9 m. (a) Find the magnitude and direction of the electric field at x = -3.2 m, y = 0.9 m.' (b) Find the magnitude and direction of..
A charged particle moves through a velocity selector at a constant speed in a straight line, Calculate the charge-to-mass ratio of the particle.
The block in the figure below has a mass of 5.7 kg and it rests on an incline of angle %u03B8. determine the angle of the incline
At an instant when a soccer ball is in contact with the foot of the player kicking it, the horizontal or x component of the ball's acceleration is 940 m/s2 What is the magnitude of the net force acting on the soccer ball at this instant
How thick should the air layer be between two flat glass surfaces if the glass is to appear bright when 530 light is incident normally.
A flashlight on the bottom of a 3.70 m deep swimming pool sends a ray upward at an angle, What angle (in air) does the emerging ray make with the water's surface
In exercising, a weight lifter loses 0.123 kg of water through evaporation, find the change in the internal energy of the weight lifter
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