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If a ball is droped from a building and it takes 2.8s for the ball to hit the ground. What is the speed of the ball. What is the height of the building.
a 1000kg car experiences a total power of 150hp (horsepower) if it starts from rest what is the magnitude of the velocity of the car in miles per hour 10s later
An electron is at the origin, and an ion with charge +5 e is at x=16 nm. Find a point where the electric field is zero
Consider a balloon containing nitrogen molecules at room temperature (20°C) and atmospheric pressure. what is the number of molecules in the balloon
Assume all angles to be exact. A certain crystal gives a deflection angle of 25 degree for the first-order maximum of monochromatic X-rays with a frequency of 4.5×10^17
Identical conducting spheres
The TGV, France's high-speed train, pulls out of the Lyons station and is accelerating uniformly to its cruising speed. find the acceleration of the train and the tension in the strap
An immersible heater coil is to be designed to heat an insulated container with 4 liters of distilled water from 20 degrees to 50 degrees C in less than 30 minutes. what is the resistance of the heating coil
An electron is observed traveling at a speed of 1.89 107 m/s parallel to an electric field of magnitude 10,660 N/C. How far will the electron travel before coming to a stop? (The mass of electron is 9.109 10-31 kg, and the charge on the electron is 1..
In a World Cup soccer match, Juan is running due north toward the goal with a speed of 7.70{\rm m/s} relative to the ground. What is the magnitude of the ball's velocity relative to Juan
Each has a charge of +e. The length of one side of the square is L. What is the net electric potential caused by the two positive ions at both of the empty corners of the square
A spherical balloon has a radius of 6.75m and is filled with helium. The density of helium is 0.179 kg/m3, and the density of air is 1.29 kg/m3. Determine the largest mass of cargo the balloon can lift
A mass m of 0.16 kg is attached to the end of a spring andreleased from rest at t = 0s from an extended positionxmax = 32 cm. Find themaximum speed of the mass
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