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A person is standing on the roof of a tall building. She throws a ball from the top of the building in such a way that when the ball passes a window cleaner who is 2.0m from the top, it is falling at a speed of 7.0m/s. It takes another 2.9s to reach the ground.
a. How tall is the building?
b. How fast is the ball moving when it hits the grounds?
The small piston of a hydraulic lift has a cross-sectional area of 3 cm2, and its large piston has a cross-sectional area of 200 cm2. What force should be applied to the small piston for the lift to raise a load of 15kN
Water at 22.0 °C is sprayed onto 0.203 kg of molten gold at 1063 °C (its melting point). What is the minimum mass of water that must be used
Find the minimum uncertainty in the speed of a bacterium hav-ing mass 3.0 x 10-15 kg if we know the position of the bacterium to within 1.0 micron, that is, to about its own size.
Two railroad cars, each of mass 7300 kg and traveling at 73 km/h, collide head on and come to rest. How much mechanical energy is lost in this collision
An RLC series circuit has R=1.35 kOhm, L=225 mH, and C=2.50 uF (micro farads) and is connected across a 60 Hz power supply. find the reactances of the capacitor and inductor
Commercial aircraft fly near 200mb where the outside temperate is -60 degrees Celsius. Calculate the temperature of the air if compressed adiabatically to the cabin pressure of 1000mb.
If the mass of the diver is 84 kg and the board is 1.5 m long, illustrate what is the magnitude of the torque due to gravity on the diving board with a pivot point at the fixed end of the board?
a dielectric is pulled from between the plates of a capacitor which remains connected to a battery. what changes occur
what would the g-force, kinetic energy and overall force a human head would absorb if they were broadside t-boned by an 80,000 pound tanker that was moving 45 miles per hour and that head absorbing party
A wave with a frequency of 230Hz and a wavelength of 12.9cm is traveling along a cord. The maximum speed of particles on the cord is the same as the wave speed. What is the amplidute of the wave?
In an EM wave the electric field oscillates 4 X 10^14 HZ at in the North - South direction. In what direction is the magnetic field oscillating
Suppose two parallel conducting plates are separated by 0.45 cm of air. Find the maximum potential difference between the two parallel conducting plates in kV
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