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Ricky, mass 95 kg, and Cathy, who is lighter, are enjoying Lake Mendota at dusk in a 20 kg canoe that is 3.0 m long.When the canoe is at rest in placid water, they exchange seats, which are at the ends of the canoe. Ricky notices the canoe moved 30 cm relative to a submerged rock during the exchange and uses that to calculate Cathy's mass. What is Cathy's mass?
The speed of a wave on a string is 30 m/s. The string is 3.0 meter long and fixed at both ends. Find the lowest resonant frequency for this system
On a section of level ground on the surface of Mars, rock is launched with an initial a velocity of 20 m/s at an angle of 40° above the horizontal. How far away does the rock land
Laboratory in your city accidentally released some radioactive gas
Two protons in a molecule are 3.90 x 10-10 m apart. Find the electric force exerted by one proton on the other
a 2 kg block is pushed from rest on a horizontal friction-less table at an angle of 37 degrees by a force of 15n. find
The box of a well-known breakfast cereal states that one ounce of the cereal contains 144 Calories (1 food Calorie = 4186 J). what is the heaviest barbell
A string is rolling several rolls about a solid sphere, and then the sphere leaved to fall from the end of the string. What is the acceleration of the center of the sphere
a projectile fixed vertically up from a canon rises 200m before returning to the ground. if the same were to fire the
V_A is the electric potential at point a. V_A ( V_B
A circular coil enclosing an area of 180 cm2 is made of 210 turns of copper wire. The wire making up the coil has resistance of 9.0 ?, what is the average current in the coil during that time
A vertical straight wire carrying an upward 21-A current exerts an attractive force per unit length of 8.3×10?4N/m, What is the magnitude of the current in the second wire
A standing wave of the third overtone is induced in a stopped pipe 1.2 m long. The speed of sound is 340 m/s. What is the frequency of sound produced in the pipe
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