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A grade school student plans to build a 38-power telescope as a science fair project. She starts with a magnifying glass with a focal length of 5.5cm as the eyepiece. What focal length is needed for her objective lens?
A disk, initially rotating at 149 rad/s, is slowed down with a constant angular acceleration of magnitude 4.23 rad/s2. (a) Explain by how much time does the disk take to stop? (b) Through what angle (rad) does the disk rotate during that time?
A 2kg piece of ice @ 0C (273K) is placed in 27C (300k) body of water. Latent heat of fusion is 334kJ/kg. What is the work done by the ice
Consider a theoretical head-on collision between two carts of equal mass and equal speed. What is the total momentum after the collision
A piece of glass has a temperature of 73.0 °C. Liquid that has a temperature of 37.0 °C is poured over the glass, determine the specific heat capacity of the liquid
Find out the tension in the strap; given that the suitcase moves with constant speed and that the coefficient of kinetic friction between the suitcase and the floor is 0.40.
question a woman on a rocket traveling at 0.35c with respect to earth observes a meteor come from in front of her and
A heavy ball with a weight of 100N (m= 10.2 kg) is hung from the ceiling of a lecture hall on a 4.5-m-long rope. What is the tension in the rope at that point
A wheel is rotating freely with an angular speed of 20 rad/s on a shaft whose moment of inertia is negligible. Calculate the angular speed of the coupled wheels
Two particles with charges +4e and -7e are initially very far apart, which is the change in the electric potential energy
Converting sunlight to electricity with solar cells has an efficiency of 15%. It's possible to achieve a higher efficiency (though currently at higher cost) by using concentrated sunlight as the hot reservoir of a heat engine. What is the theoreti..
alpha particles of charge q 2e and mass m 6.6 10-27 kg are emitted from a radioactive source at a speed of 1.5 107
An array of four charges is arranged along the x-axis at intervals of d = 4.8 m. If three of the charges are the same, q = +0.5 µC, and the charge at the far right is -0.5 µC, what is the potential at the origin
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