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Your professor enters the dogsled race during winter break. To getstarted, he pulls his sled, a mass 80 kg with a force of 180N at 20degrees to the horizontal. Find a) the work he does b) the finalspeed of the sled after it moves 30s. c) What F did your professorexert if the sled starts with a speed of 2m/s after he pulls itthrough the distance of 5m?
The velocity v of waves on a vibrating string depends on the tension T in the string and the mass per unit length λ of the string. Derive an expression for v by using the dimensional analysis method
The captain of a boat wants to travel directly across a river that flows due east with a speed of 1.42 m/s. What direction (in degrees) should the captain steer the boat
A solid sphere is released from rest and allowed to roll down a board that has one end resting on the floor and is tilted at 22° with respect to the horizontal. find the sphere's speed when it reaches the lowest end of the board
The partial pressure of CO2, in the expired air is 25 mm Hg and in the alveolar air it is 39 mm Hg. For an expired volume of 550ml, calculate the dead space volume
calculate the ratio of the drag force on a jet flying at 800 kmh at an altitude of 8.0 km to the drag force on a
A water molecule, which is electrically neutral but has a dipole moment of magnitude p = 6.20·10-30 C m, Calculate the magnitude of the net force
Suppose the player has a mass of 0.658 kg. How long might the player operate on the energy required to lift it through a height of 1.17 m.
Consider a series RLC circuit where R = 957 ? and C = 5.25 ?F. However, the inductance L of the inductor is unknown. What is the inductance of the inductor in millihenrys
Suppose that the helium atom, with a filled 1s electron shell, has the same ground-state radius as the Bohr hydrogen atom, Find the density of the 4He atom
A daredevil plans to bungee jump from a balloon 72.0 m above a carnival midway. He will use a uniform elastic cord, What length of cord should he use
A particle starts from the origin at t = 0 with a velocity of8.0j m/s and moves in the xy plane with a constant acceleration of94.0i + 2.0j) m/s^2. What is the speed of the particle at this time
A person of mass 80.0kg stands at the center of a rotating merry-go-round platform of radius 2.50m and moment of inertia 910kg*m^2. Calculate the rotational kinetic energy of the system of platform plus person before and after the person's walk
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