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A wheel is mounted on a stationary axle which we can assume frictionless. As a result, the wheel can turn freely but cannot translate. The wheel can be described as two concentric rings of masses 1 kg and 0.5 kg and radii 50 cm and 85 cm. You wrap a string of negligible mass around the outer ring and pull on it, increasing the angular speed of the wheel from 0 to 8 revolutions per second. Determine:
a) How much work is done by you on the pulling;
b) If your hand has moved 3 meters (that is the amount of string that you unwrap in the pulling), how much is the pulling force?.
An 77 kg quarterback jumps straight up in the air right before throwing a 0.43 kg football horizontally at 15 m/s. Illustrate how fast will he be moving backward just after releasing the ball?
The accommodation limits for Nearsighted Nick's eyes are 20.0 cm and 82.0 cm. When he wears his glasses, At what minimum distance is he able to see objects clearly
An electron remains in an excited state of an atom for typically 10-8 s. What is the minimum uncertainty in the energy of the state
The driver of a car slams on the brakes when he sees a tree blocking the road. With what speed does the car then strike the tree
A particular spring has a force constant of 2.8×103N/m, How much work is done in stretching the relaxed spring by 7.0cm
A 3.85 kg mass attached to a spring oscillates with a period of 0.355 s and an amplitude of 20.5 cm. find the maximum speed of the mass
The charges and coordinates of two charged particles held fixed in the xy plane are: q1=6.00 ?C, x1=6.700 cm, y1=4.600 cm, Find the direction and magnitude of the electrostatic force on q2
A very large number (N+1) polaroids are arranged in a sandwich, The transmission axis of each polaroid is at a constant angle, with respect to its predecessor
A proton accelerates from rest through 1500 volts. the proton then enters a region of space where the magnetic field is 0.3 tesla (and this field is perpendicular to the velocity). calculate the radius of the resulting circular motion?
A 2.0 cm tall candle flame is 1.8 cm from a wall. You happen to have a lens with a focal length of 36 cm . 1. How many places can you put the lens
What is the magnitude of the acceleration of a modified At wood machine if the mass of the cart is 3 kg and the hanging mass is 4 kg
It can be shown that asin(theta) + bcos(theta), where ab is not = 0, is a circle. Find the center (in Cartesian Coordinates) and the radius of the circle in terms of a and b
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