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A massless, rigid board is placed across two bathroom scalesthat are separated by a distance of 2.00 m. A person lies on theboard. The scale under his head reads 400 N, and the scale under his feet reads340 N.
(a) Find the weight of the person.
N
(b) Determine the distance between the person's head and his centerof gravity.
m
The mass of a star is 1.75·1031 kg and it performs one rotation in 37.3 days. Find its new period (in /days) if the diameter suddenly shrinks
An inexperienced catcher catches a 130 km/h fastball of mass 140 g within 1 ms, What are the average forces imparted to the two gloved hands during the catches
Two bars of identical mass are at 32 °C. One is made from glass and the other from another substance. The specific heat capacity of glass is 840 J/(kg · C°).
A variable-speed drill, initially turning at 400 rpm, speeds up to 1300 rpm in a time interval of 1.0 s. What is its average rotational acceleration
A sound source radiates sounds uniformly in all directions. the intensity of the sound at a distance of 100 m is 1.00 x 10^-4 W/m^2. What is the power of the sound source
A circular loop of radius 50 mm in the plane of the paper carries a counterclockwise current of 15 A. It is submerged in a medium that has a relative permeability of 3.0 Calculate the magnitude and direction of the magnetic induction at the center of..
You have a cup containing 220 g of freshly brewed coffee which, at 75C, is too warm to drink. estimate how much the entropy of the universe increases
Evaluate the magnitude of N at the lowest point? If the wheel's speed is doubled, what is the magnitude FN at the highest and lowest point?
A photocathode whose work function is 2.5 eV is illuminated by white light of wavelength range from 380 nm to 720 nm. What is the stopping voltage Vnot for this experiment
If it starts 4.70m from the lower edge of the roof, how fast will the toolbox be moving just as it reaches the edge of the roof if the kinetic friction force on it is 21.0N
A 12,600-kg railroad car travels alone on a level frictionless track with a constant speed of 15.8 m/s. What will be the car's new speed
Two race cars are traveling in the same direction, one in front ofthe other, 351 m apart, at a speed of69.2 m/s. The driver of the car in frontsounds his horn. How much time elapses before the other driverhears the horn?
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