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A window air conditioner has an average coefficient of performance of 2.3. In a futile attempt to cool a bedroom, this unit has been placed on the floor by the bed. During this attempt, 72000 J of heat is removed from the air in front of the unit. Determine the net heat added to the room by operating the air conditioner in this manner.
A ball and bat, approaching one another each with the same speed of 1.1 m/s collide. Find the speed of the ball after the collision. find the factor by which the kinetic energy of the ball increases
A car takes 16 s to go from v = 0 to v = 50 m/s at approximately constant acceleration. If you wish to find the distance travelled using the equation d = 1/2 at2, what value should you use for a.
A sonar device makes a soundwave in the air with a frequency of f1 = 61 Hz. What is the frequency of the sound wave created
An object oscillates in 1-D with an amplitude of 10 cm. At t = 0 s, its position is x = - 5 cm, What is the velocity of the object
A 2 kg object attached to a spring moves without friction (b = 0) and is driven by an external force given by the expression F = 4.60sin (2pi*t), where F is in newtons and t is in seconds. The force constant of the spring is 20.0 N/m.
a detector has a sensitivity of 10^6 V/W and a NEP* = 10^-10 W/Hz^1/2. Light of 1E-6 W power is measured with the detector, what is the signal
A vertical tube 1.9cm in diameter and open at the top contains 4.0g of oil (density 0.82 g/cm^3) floating on 4.0g of water. Find the gauge pressure at the oil-water interface
Explain how long is the bullet in the target? What average force does the bullet exert on the target? What is the target's speed just after the bullet emerges?
Illustrate what is the magnitude of the net torque on the wheel due to these three forces for an axis perpendicular to the wheel and passing through its center?
Calculate the volume of a rectangular prism with a length of 5.6 cm, a width of 2.1 cm, and a height of 6.6 cm
At a dock, a crane lifts a 1200 kg container 30 m, swings it out over the deck of a frieghter, and lowers the container into the hold of the freighter, which is 10 m below the level of the dock. The acceleration of gravity is 9.8 m/s2. Neglect fri..
The center of mass of a proton with mass 1.673·10-27 kg and alpha particle with mass 6.645·10-27 kg is moving with a speed of 6.993×105 m/s
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