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in a hurricane, the air (density 1.2kg/m3) is blowing over the roof of a house at a speed of 104km/hr. what is the lifting force on the roof of area 100m2?
Diffraction grating produces its third-order bright band at an angle of 79.4 degrees for light of wavelength 731nm. Find the angular location of the first-order bright band
A hollow sphere of radius 0.30 m, with rotational inertia I = 0.098 kg m2 about a line through its center of mass, rolls without slipping up a surface inclined at 27° to the horizontal. What is the speed of its center of mass now
A football player carrying the ball runs straight ahead at the line of scrimmage and directly into a wall of defensive linemen. Find the magnitude and direction of his average acceleration
The aircraft carrier John F. Kennedy has mass 7.4 107 kg. When its engines are developing their full power of 280,000 hp, the John F. what is the magnitude of the force of water resistance
A proposed ocean thermal-energy conversion (OTEC) system is a heat engine that would operate between warm water (17°C) at the ocean's surface, What is the maximum possible efficiency of the system
Because of the Earth's rotation, a plumb bob does not hang exactly along a line directed to the center of the Earth. How much does the plumb bob deviate from a radial line
The temperature of 15 kg of water increases at 0.003 degrees Celsius per second. At what rate is the internal energy of the water increasing
A pulsar is an extremely dense neutron star which is a highly magnetized. As it rotates it emits a beam of electromagnetic radiation which can sweep across the earth at very regular intervals. by what amount would the pulsar radius have had to shri..
Select ALL the valid statements, i.e., B, AC, BCD. If an equation is dimensionally A) correct, the equation may be correct. B) incorrect, the equation may be correct. C) correct, the equation may be wrong. D) incorrect, the equation must be wrong...
question1analyse the crystal thickness pd df prf prp spl period and distance to reflector if a 3 cycle pulse emitted
The bullet emerges from the block with a speed of 200 m/s, and the block rises to a maximum height of 12 cm. Evaluate the initial speed of the bullet. V = 530 m/s
A record was set for stair climbing when a man ran up the 2000 steps of the Empire State Building in 13 minutes and 10 seconds. what was his average power output during the climb
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