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Question1
A woman is reported to have fallen 178 ft from a building, landing on a metal ventilator box that she crushed to a depth of 21 in. She suffered only minor injuries.
(a) Neglect air resistance; determine the speed of the woman just before she collided with the ventilator box.
(b) Compute the magnitude of her average acceleration while in contact with the box.
(c) Compute the time it took to crush the box.
Question2
A woman walks 171 m in the direction 46° east of north, then 163 m directly east. Find
(a) Magnitude and
(b) Angle (from due east) of her final displacement from the starting point.
(c) Discover the distance she walks.
My car has rear defrosters that are made of 13 wires embedded into the rear window. They can melt a thin layer of ice, What is the cross-sectional area of each wire
While standing on a bridge 45m above the ground, you drop a stone from rest. When the stone has fallen 4.90m, you throw a second stone straight down. What initial velocity should you give the second stone if they are both to reach the ground at th..
A magnetic field is passing through a loop of wire whose area is 0.018 m2. What is the average emf induced in the loop
you are a fighter pilot in your jet. you are moving at 1000 km/h when you go into a climb in order to avoid a HUGE UFO. What is the radius of the circular arc
Calculate the magnitude and direction of net electric field. what is the efficiency of the engine under those conditions.
A playground merry-go-round of radius R = 1.20 m has a moment of inertia I = 265 kg · m2, What is the new angular speed of the merry-go-round
Two charged plates create a potential difference of 190 V. At a point halfway between the plates an electron is released from rest. What was the initial speed and direction of the proton
wo point charges are located as shown in the figure, with charge q1 = +1.6 C at x = ?3.0 m, y = 0, How much work must be done on the electron to move it to the origin
a popular method of distributing music used to be on disks that had a radius of about 0.3m and spun at a constant angular velocity of about pi radians per second. Find the tangential velocity at the inner and outer edges
Assume the speakers are reconnected so that the 440 Hz sounds they emit are accurately out of phase. At what positions (how far should the microphone be moved to the right) are the intensity maximum and minimum now.
An event occurs at x′ =60m, t′ =8×10-8 sec in a frame S′ (with y′ =0, z′ = 0). The frame S′ has a speed of 3c/5 in the x direction with respect to frame S. The origins of S and S′ coincide at t = 0, t′ = 0. What are the spacetime coordinates of th..
Water at a pressure of 3.2 atm at street level flows into an office building at a speed of 0.5 m/s through a pipe 5.6 cm in diameter. Calculate the water pressure in such a pipe on the top floor
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