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An object is thrownhorizontally from the top of a cliff with a speed of 5 m/s. How many seconds after it is thrown is theobject’s speed twice that of its initial value?
Given that the number of electrons per volume in aluminum is 3.01x10^56 electrons/m^3, determine the valence number (number of free electrons per atom)
A 16.5 kg gold bar at 26.0°C is placed in a large, insulated 0.800 kg glass container at 15.0°C with 2.00 kg of water at 25.0°C. Calculate the final equilibrium temperature
a car is going at a speed of 21.6 kmhr when it encounters a 12.8m long slope of angle 30 degree. the friction
a car is hauling a 85.8-kg trailer to which it is connected by a spring. the spring constant is 2360 nm. the car and
As you ride your 14-kg bicycle on level ground you do some work against a 30N force of air resistance if your mass is 65-kg.What is power you apply to maintain a velocity of 25-km`.a-on level ground b-going up a 5degrees slope?(remember it's a num..
The drive train of a bicycle includes wheels 67.3 cm indiameter and pedal cranks 17.5 cm long. The cyclist pedals at asteady angular rate of 76.0 rev/min. Calculate the angular speed of the bicycle wheels
A block of mass m is accelerated across a rough surface by a (massless) rope passing over an ideal pulley and connected to a second mass m2. Derive an expression for the acceleration of the sliding block
two charged particles are moving with equal velocities of 2.30 ms in the x-direction. at one instant of time the first
You're an optometrist, mounting a projector at the back of your 4.2m -long exam room, 2.6m above the floor. At what height should you center the pattern on the wall
The attractive electrostatic force between the point charges 7.35x10^-6C and Q has a magnitude of 0.400N when the separation between the charges is 2.92m. Find the sign and magnitude of the charge Q.
You are designing an elevator for a hospital. The force exerted on a passenger by the floor of the elevator is not to exceed 1.51 times the passenger's weight. What is the maximum speed of the elevator
two particles, each with mass m = 0.95 kg, are fastened to each other, and to a rotation axis at O, by two thin rods, each with length d = 5.8 cm and mass M = 1.4 kg. what is the combination's kinetic energy
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