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A bicyclist climbs a 2.0km long hill that makes an angle of 7.0° with the horizontal. The total weight of the bike and rider is 750N. How much work is done on the bike and rider by gravity? (The answer given in the textbook is: -180kJ) I'm having trouble figuring out how they got that solution.
A watertight car is submerged under water. What force is required to open a door of area 1.25 m2 if the average depth of water at the door is 1.92 m
use the biot savart to compute the magnetic field at the center of a matalic ring. the ring has a radius of 10^-6 m, compute the magnetic field at the center of the ring
What is magnitude of the unknown force
An optical disk drive in your computer can spin a disk at up to 10,000 rpm. If a particular disk is spun at 8690 rpm while it is being read, what is the magnitude of the linear acceleration of a point 1/11 of the way out from the center of the disk
mary beth uses a torque feeler that consists of a meter stick held at the 0 cm end with a weight danglig from various positions along the stick. how much more torque is exerted when it is hung from the 75 cm mark
A dentist uses a small mirror of radius 45 mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 14 mm from the tooth, what is the magnification of the resulting image.
Assume you are a medieval knight attacking a castle with a cannon. The cannonball leaves the cannon with a speed of 35.3 m/s, What is the maximum height of the cannonball above the cannon's muzzle
Consider the sinusoidal wave of in the figure below with the wave function y = 0.150 cos (15.7x ? 50.3t) where x and y are in meters and t is in seconds. At a certain instant, let point A be at the origin and point B be the closest point to A along t..
A sledge loaded with bricks has a total mass of 18.1 kg and is pulled at constant speed by a rope inclined at 20.8° above the horizontal. What is the mechanical energy lost due to friction
people often use the term energy crisis implying that we are running out of energy. how can this be if energy is
Suppose you consume 2000 Cal of food per day. Note that a food Calorie, with capital C, is one kilocalorie: 1 Cal = 1 kcal. How many watts of heat and work can you do
A duck is swimming down a river and passes a slow moving log. what is the ratio of the log\'s mass to the duck\'s mass
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