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A piece of Styrofoam is completely submerged under water (ρ = 1000 kg/m^3). It is held under because it is attached to a weight whose volume is 0.0002m^3 and whose density is 15000 kg/m^3. While submerged, the system was weighed and the reading on the balance was 2.4 kilogram. The volume of the Styrofoam is 0.001m^3. Evaluate the density of the Styrofoam.
A bridge over a valley is 300m above the bottom of the valley. A bungee jumper plans to leap from the bridge and barely touch the bottom of the valley. What is the highest speed of the jumper
A 240-V dc motor has an armature whose resistance is 1.10? . When running at its operating speed, it draws a current of 16.0A, What is the back emf of the motor when it is operating normally
Using the Bohr model what is the radius of the electron orbit in the Hydrogen atom when the electron is in the n = 2 state, What is the energy of the Hydrogen atom
a 296 g bird flying along at 6.57 ms sees a 8.8 g insect heading straight toward it with a speed of 34.87 ms. the bird
A hoop of mass 1.9 kg and radius 55 cm has a string wrapped around its circumference and lies flat on a horizontal frictionless table. What is the angular velocity of the hoop about its center of mass after 2 s
Tarzan, with a mass of 80.0 kg, wants to swing across a ravine on a vine, how much kinetic energy (at least) must he have when he jumps off the cliff where he starts
q1. under the influence of its drive force a snowmobile is moving at a constant velocity along a horizontal patch of
A ball of mass 1.91 kg is dropped from a height y1 = 1.35 m and then bounces back up to a height of y2 = 0.59 m. How much mechanical energy is lost in the bounce
A rocket, away from all gravitational forces, accelerates upward at an acceleration of 12.8m/s^2. On its main deck is a crate with a mass of 81.6kg. How many forces act on the crate
Assume 3.0 moles of a diatomic gas has an internal energy of 10 kJ. Determine the temperature of the gas after it has reached equilibrium.
Expalin how many revolutions will the car have gone through when the magnitude of its total acceleration is 2.00 m/s^2?
alice is located at a safe infinite distance from a black hole with a mass of 10 solar masses. she drops a clock on a
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