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A pond with a flat bottom has a surface area of714m2 and a depth of 2.8m. On a warm day, the surface water is at temperature of 25°C, while the bottom of the pond is at 12°C. Find the rate at which energy is transferred by conduction from the surface to the bottom of the pond. (Use0.6 J/s · m· °C for the thermal conductivity of water.)
A student standing on the ground throws a ball straight up. How long is the ball in the air before it hits the ground
A paratrooper fell 370 m after jumping from an aircraft without his parachute opening. He landed in a snowbank, creating a crater 1.1 m deep, find the work done on him by air resistance as he fell
a cannon fires a cannonball from the top of a wall at a speed of 29.42 ms and an angle of 13.75 degrees from the
an elephant can runat a steady speed of 10m/sec and can stop in 2.5 sec what is the average acceleration of the elephant while stopping
a pen contains a spring with a spring constant of 228 nm. when the tip of the pen is in its retracted position the
A block of ice with mass 2.00kg slides 0.750m down an inclinedplane that slopes downward at an angle of 36.9 degrees belowthe horizontal. If the block of ice starts from rest, what is its final speed
A piston-cylinder device contains air (2kg) at 100kPa and 300K. The air is compressed slowly and frictionless by following a polytropic process with a polytropic exponent of 1.4. The temperature reaches at 360K at the final state.
Two steel guitar strings have the same length. String A has a diameter of 0.55 and is under 440.0 of tension. Find the ratio of the wave speeds in these two strings
A muon formed high in Earth's atmosphere travels at a speed 0.990 0 c for a distance (as we see it) of 4 600 m before it decays. How far does the muon travel as measured in its frame
a 0.40-kg block initially at rest on a frictionless horizontal surface is acted upon by a force of 3.0 n for a distance
At one time, television sets used "rabbit-ears" antennas. Such an antenna consists of a pair of metal rods. The length of each rod can be adjusted to be one-quarter of a wavelength of an electromagnetic wave whose frequency is 125 MHz. How long is ea..
A neutral sodium atom has an ionization potential of X=5.1eV. Sodium has mass number A=23. What is the minimum speed of a free electron that can ionize a sodium atom in the ground state?
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