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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 spacecraft receding from he earth at 0.97c transmits data at the rate of 1*104pulses/s. At what rate are they received.
A 0.44T magnetic field is perpendicular to a circular loop of wire with 52 turns and a radius of 17cm. what is the magnitude of the induced emf
A sanding disk with rotational inertia 5.4 x 10-3 kg·m2 is linked to an electric drill whose motor delivers a torque of magnitude 10 N·m about the central axis of the disk. About that axis and with torque applied for 72 ms, what is the magnitude o..
Suppose you were to disconnnect the battery (without losing any of the charge on the plates) and then remove the dielectric medium. What would be the new voltage across the plates
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It's found that string is set into oscillation only at the frequency 880 Hz and 1320 Hz as the frequency of an oscillator is varied over the range 500-1500 Hz. What is the tension in the string.
A balloon with a radius of 14.00cm and an electric charge of 3.75 × 10-9 C is brought within the electric field of the larger balloon so their centres are 40cm apart. Establish the magnitude of the electric force exerted by this electric field on ..
Illustrate what is the concentration of sodium and chloride ions at a distance 3 angstroms from protein surface.
Several different waves were created using the same string. The tension of the spring is was kept the same for each wave. What charecteristic is the same for all waves
You can think of the work?kinetic energy theorem as a second theory of motion, parallel to Newton's laws in describing how outside influences affect the motion of an object. Use the work-kinetic energy theorem to find the net work that is done on t..
Block A is dropped from a height of 2 m. An identical block B slides frictionlessly down a ramp of height 2 m inclined at 30°. Which block is travelling fastest at the bottom of the ramp
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