Wrecking ball is hanging at rest from a crane
A wrecking ball is hanging at rest from a crane when suddenly the cable breaks. The time it takes for the ball to fall halfway to the ground is 1.3 s. Find the time it takes for the ball to fall from rest all the way to the ground.
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A Cessna aircraft has a lift-off speed of 120 km/h. (a) What minimum constant acceleration does this require if the aircraft is to be airborne after a takeoff run of 270 m? (b) How long does it take the aircraft to become airborne?
Calculate the volume of H2 produced at 1 atm and 298 K. Assume the current efficiency is 100% and that hydrogen behaves as an ideal gas.
A whale swims due east for a distance of 6.0 km, turns around and goes due west for 4.0 km, and finally turns around again and heads 4.9 km due east. (a) What is the total distance traveled by the whale?
The following impedance spectra were acquired at 270 C (closed circles) and 25 C (open circles) for NASICON. Describe the type of electrode used in the cell and draw an equivalent circuit for the cell.
Human hairs have diameters between 17 and 180 μm. For a hair that has a 72.0 μm diameter, how many can fit between a pair of teeth on a comb that are 0.150 inches apart ?
A Styrofoam cup holding 110 g of hot water at 88°C cools to room temperature, 23.0°C. What is the change in entropy of the room? Neglect the specific heat of the cup and any change in temperature of the room.
Calculate the required diameter of a 3 m long stainless steel (annealed) rod subjected to an axial tensile load o f 67 kN. The yield stress is 360 MPa.
DNA structure, called the i-motif can be formed from sequences containing stretches of cytosine (C) residues. In this structure protonated C forms a noncanonical base pair with anunprotonated C.
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