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Dorothy is up on her 15.0m by 13.0m roof enjoying the view of Kansas. Suddenly, a strong wind blows down her ladder, leaving her stranded. She knows that a high wind reduces the air pressure on the roof, and that there is a danger that the atmospheric pressure inside the house will blow the roof off. As the wind reaches a speed of 35.0m/s, she calls to her Auntie Em for help. Calculate the force on the roof.
A boat takes 4 h to travel 30 kilometer down a river, then 8 h to return. Evaluate how fast is the river flowing
A singly charged ion of mass m is accelerated from rest by a potential difference ?V. What is the ratio of the masses of the ions
50 small round balloons float in a volume with surface area 10m x 10m, and a width of 0.5 meter. Each balloon has a diameter of 0.2meter. Find what is the fraction of the total surface blocked by balloon
A single-loop circuit consists of a 7.3? Resistor, 12.0 H inductor, and a 3.1 ?F capacitor. Initially the capacitor has a charge of 6.2? C and the current is zero. Compute the charge (in C) on the capacitor N complete cycles later for N = 5.
Starting with the equations defining H, G and F, derive their counterparts which involve partial molar quantities: Hk =Uk +PVk Gk =Hk -TSk Fk =Uk -TSk
A car travels up a hill at a constant speed of 31 km/h and returns down the hill at a constant speed of 47 km/h. Calculate the average speed for the round trip
An 86 Kg person stands on a uniform ladder 4m long, that weighs 70N. The floor is rough; hence, it exerts both a normal force, and a frictional force, on ladder. The wall, on the other hand, is frictionless; it exerts only the normal force. What a..
At the end of a factory production line, boxes start from rest and slide down a 35o ramp 4.8 m long. If the slide is to take no more than 2.1 s, what is the maximum coefficient of friction among the box and the slide?
Find the peak magnetic field in an electromagnetic wave whose peak electric field is 200N/C
it takes the elevator in a skyscraper 4.0 to reach its cruising speed of 10 . a 60 passenger gets aboard on the ground
A charged isolated metal sphere of diameter 24.0 cm has a potential of 7400 V relative to V = 0 at infinity. Calculate the energy density in the electric field near the surface of the sphere.
A falling stone takes 0.33s to travel past a window 2.20 m tall on the right. From what height above the top of the window did stone fall.
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