A 20 kg ladder 10 m long is leaned against a frictionless wall at an angle of 55°. A 60 kg electrician slowly climbs the ladder. The coefficient of static friction between the ladder and the floor is 0.5. How far up the ladder can she climb before it starts to slip? If she resets the ladder at a higher angle, she can go all the way to the top. What is the minimum angle?

Picture a all traveling at a constant speed around the inside of a circular structure. is the ball accelerating? explain your answer

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.

Aball thrown by ginger is moving upward through the air. diagram a shows a box with a downward arrow. diagram b shows a box with an upward arrow. diagram c shows a box with a downward and upward arrow equal in size. diagram d shows a box with a downward and upward arrow with the downward arrow larger in size. which force diagram represents the forces on the ball? you may neglect the effects of air resistance.