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Question: The radiation pattern of a circular parabolic-reflector antenna consists of a circular major lobe with a half-power beamwidth of 3? and a few minor lobes. Ignoring the minor lobes, obtain an estimate for the antenna directivity in dB.
a penny is sitting on the edge of an old phonograph disk that is spinning at 45 rpm and has a diameter of 6.5 inches.
What linear speed must a 4.5×10?2 hula hoop have if its total kinetic energy is to be 0.15 ? Assume the hoop rolls on the ground without slipping.
A large gate weighing 200 Newton is supported by hinges at the bottom and top, and is further supported by a wire. Calculate the vertical forces on the hinges
The Boeing 727 aircraft of Example 9.8 cruises at 520 mph at 33,000 ft altitude on a standard day. Calculate the cruise Mach number of the aircraft. If the maximum allowable operating Mach number for the aircraft is 0.9, what is the corresponding..
Students use a simple pendulum with a length of 36.9cm to determine the value of "g". If it takes 12.2s to complete 10 oscillations, what will be their experimental value "g"?
A suitcase full of platinum sits at thebottom of a lake. A recovery diver finds that as he lifts thesuitcase to the surface, What is the volume of the large suitcase
A 2.0-kg cart collides with a 1.0-kg cart that is initially at rest on a low-friction track. what was the initial velocity of the 2.0-kg cart
A pulsar is a rapidly rotating neutron star that emits a radio beam the way a lighthouse emits a light beam. What is the pulsar's angular acceleration
Two waves, and are given by the equations y1 = 2.5 sinπ(x + 5t) and y2 = 2.5 sinπ(x + 5t) . (a) Determine the equation of the standing wave. (b) Determine the position of the first 4 nodes of the standing wave.
A block of plastic (0.7 kilogram) is sitting on a rough horizontal plane (μk = 0.4). Find what is the speed of the block after the bullet passes through it
A 110 g copper bowl contains 130 g of water, both at 24.0°C. A very hot 370 g copper cylinder is dropped into the water, causing the water to boil, How much energy (in calories) is transferred to the water as heat
A 195g oscillator has a speed of 91.50cm/s when its displacement is 3.90cm and 73.0cm/s when its displacement is 6.20 cm
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