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A man stands on a platform that is rotating (without friction) with an angular speed of 1.68 rev/s; his arms are outstretched and he holds a brick in each hand. The rotational inertia of the system consisting of the man, bricks, and platform about the central axis is 4.78 kg·m2. If by moving the bricks the man decreases the rotational inertia of the system to 1.69 kg·m2,(a)what is the resulting angular speed of the platform and(b)what is the ratio of the new kinetic energy of the system to the original kinetic energy?
a 200 g plastic ball is at rest on a frictionless incline 0.658 m above the surface of a table. The ball then rolls down the incline and across the table coming to rest after a distance of 2.45 m.
Calculate the de Broglie wavelength for a proton moving with a speed of 6.3 × 106 m/s. The mass of a proton is 1.67262 × 10-27 kg and Planck's constant is 6.62607 × 10-34 J · s
Lightning As a crude model for lightning, consider the ground to be one plate of a parallel-plate capacitor and a cloud at an altitude of 470m to be the other plate. How much charge can the cloud hold before the dielectric strength of the air is ex..
A transverse periodic wave is represented by the equation z(y,t) = 3.2 cm sin( 5m^-1 y + 1500 rad/s t). What is the frequency of the vibration of the wave? Give answer in Hz
A helicopter of mass 3770 kg can create an upward lift forceF. When empty, it can accelerate straight upward at amaximum of 1.37 m/s2. What is the mass of the cargo
an 9.0 m 220 n uniform ladder rests against a smooth wall. the coefficient of static friction between the ladder and
Suppose your waffle iron is rated at 1.50 kW when connected to a 2.10 multiply.gif 102 V source. What current does the waffle iron carry? What is its resistance?
A simple harmonic oscillator has a potential energy of 25x2 Joules, a kinetic energy of 0.5v2 Joules where x is the displacement in meters and v the instantaneous velocity in m/s. determine the maximum instantaneous velocity
A man doing a chin-up weighs 665 Newton exclusive of the arms. During the first 30.0 centimeter of the lift, find the man's velocity at this point
How much energy is lost through the walls of the hot water heater in one week? (Assume thinner surface of the heater is 90 C and the outer surface is 27 C.)
Catapults date from thousands of years ago, and were used historically to launch everything from stones to horses. At what speed did the projectiles hit the wall
When a hammer strikes a nail, it is compressed along its length. What is the impulse imparted to the hammer
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