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Dorothy is up on her 14.0m by 18.0m 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 42.5m/s, she calls to her Auntie Em for help. Calculate the force on the roof.
When there is an input connected across a 12V DC source what is the voltage of the output voltage after the power is connected for a while
A bicycle has wheels with a diameter of 0.67m. It accelerates uniformly and the rate of rotation of its wheels increases from 191 rpm to 260 rpm in a time of 21.70 s. Find the linear acceleration of the bicycle.
A cardinal (Richmondena cardinalis) of mass 3.60×10-2 and a baseball of mass 0.146 have the same kinetic energy. What is the ratio of the cardinal's magnitude of momentum to the magnitude of baseball's momentum.
When it rains water vapour in the air condenses into liquid water and energy is released. How much energy is released when 0.0244m of rain falls over an area of 2.59 x 10^6 m^2? If the average energy needed to heat one home for a year is 1.40 x 10^11..
A 80.5 kg firefighter slides down a pole while a constant frictional force of 300 N retards her motion. Find the firefighter's speed just before she collides with the platform
What is the concentration of the Cd in the soil if the city of Des Moines adds 3 tons of compost/ acre-6 inches given the compost contains 50 ppm Cd
the electromagnetic wave that delivers a cellular phone call to a car has a electric field with an rms value of 4.5e10^-2. find the intensity of the wave generated by this phone call
A metal bar with a resistance of 30 ohms is rotated around its center in a magnetic field of strength 0.5 T, what is the electrical power dissipated in the resistor
A gear train is to be designed to transmit power from shaft 1 to shaft 2 with the following condition: Shaft 1 (driven by an electric motor) rotates at 100 revs min%u20131. Determine the input power required at shaft 1
A 2.0 mL syringe has an inner diameter of 4.0 mm, the needle inner diameter of 0.21 mm, and a plunger pad diameter (where you place your finger) of 1.20 cm. A nurse uses the syringe to inject medicine into a patient whose blood pressure is 140/100. S..
An electric motor is plugged into a standard 120V electrical service. At startup a current of 23.4A is measured. what is the operating current with the new resistor added
What is the difference between mass and weight? On earth, what is the weight of a 1 kg mass?
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