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During a workout, the football players at Rutgers State University ran up the stadium stairs at a steady pace in 58 s. The stairs are 140 m long and inclined at an angle of 37o. If a typical player has a mass of 100 kg, estimate the average power output on the way up. Ignore friction and air resistance.(g = 9.8 m/s2)
watts
When light of wavelength 350 nm falls on a potassium surface, electrons having a maximum kinetic energy of 1.31 eV are emitted, find the cutoff wavelength
A woman weighs 180 lb. Determine the following her weight in newtons and her mass in kilograms
A plastic block of dimensions 2.5 cm x 3.8 cm x 4.0 cm has a mass of 28.0 g. What is the density of the block? If placed into a cup of water, will the block float or sink
A gymnast of mass 55.0 hangs from a vertical rope attached to the ceiling. You can ignore the weight of the rope and assume that the rope does not stretch. Use the value for the acceleration of gravity.
An 85 kg spacewalking astronaut pushes off a 655 kg satellite, exerting a 115N force for the 0.600 s it takes him to straighten his arms.
The intensity in normal conversation, when about50 cm from the speaker, Estimate the power output of sound from a person speaking in normal conversation
A small package rests on the horizontal dashboard of a car. If %u03BCs = 0.327, what is the minimum acceleration of the car
A point charge +6.7 uC is placed at the origin, and a second charge -3.6 uC is placed in the X - Y plane at (0.40 m , 0.55 m ). Where should a third charge be placed in the plane
The spring of the pressure gauge shown in has a force constant of 1 400N/m, and the piston has a diameter of 1.60cm. When the gauge is lowered into water in a lake, what change in depth causes piston to move in by 0.850cm.
A helium-neon laser intended for instructional use operates 7.5 mW. Find out the maximum value of the electric field at a point where the cross sectional area of beam is 10 mm.
Using a Time Domain Reflectometry (TDR) probe (rod length 30 cm) to estimate the soil water content of a wet sandy loam soil. alculate the volumetric wetness of the soil using the Topp and Davis (1985) equations
In a large centrifuge used for training pilots and astronauts, a small chamber is fixed at the end of a rigid arm that rotates in a horizontal circle. obtain How long is the arm of the centrifuge
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