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Q1. A school bus takes 0.89 h to reach the school from your house. If an average velocity of the bus is 21.1 km/h to the east, what is the displacement?
Q2. A 78 kg parachutist descends through a vertical height of 400 m with the constant speed. Find the enhancement in entropy produced by the parachutist, assuming the air temperature is 21 degrees C.
A nuclear power plant operates at 75% of its maximum (Carnot) efficiency between temperatures of 625 degree C, how much exhaust heat is discharged per hour
A Cepheid variable has been found to have a period of 22 days, from this its luminosity is determined to be 2.8 x 1029 W, calculate the distance to the Cepheid
A tiny 0.0250 -microgram oil drop containing 15 excess electrons is suspended between to horizontally closely-spaced metal plates, Which plate must be positive, the upper one or the lower one
Measurements of the radioactivity of a certain isotope tell you that the decay rate decreases from 8305decays per minute, What is the half-life T1/2 of this isotope
A wood block floats on water with 35% of its volume above the surface (of water), what is the average density of the block (in kg/m3)
If the percentage standard error in measuring voltages and currents is 2%, what is the percentage standard error in finding
Suppose you make a new kind of compact disk that is the same thickness as a current disk but twice the diameter
A 65 kg crate slides on a rough plane inclined upward at an angle of 28 degrees, what is the magnitude of the sliding friction force on the box, what is the coefficient of kinetic friction between teh box and the incline
An ice cream cone is filled with melted vanilla ice cream of density 1.21g/cm3 The cone is 10.1cm long and has a diameter of 6.1 cm at the larger top end. Find the gauge pressure at the bottom of the cone
How high a tree would a 79.0 kg person have to climb to increase his gravitational potential energy relative to the ground by that amount.
The telescope at a small observatory has objective and eyepiece focal lengths respectively of 20.0 m and 12 cm. determine length of the barrel of the telescope
You and your surfing buddy are waiting to catch a wave a few hundred meters off the beach. The waves are conveniently sinusoidal, What is the frequency of the waves, Find the speed of the waves
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