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A heat engine takes in 150 kJ of energy from a source at 740 K and expels 50 kJ to a reservoir at 300 K. Calculate the ideal efficiency and the actual efficiency of the engine.
The secondary coil of a step-up transformer provides the voltage that operates an electrostatic air filter. Find the power consumed by the air filter
question a radiation detector exposed to sunlight records the energy falling on a given area each minute. the detector
A 107 ball is tied to a string. It is pulled to an angle of 4.20 and released to swing as a pendulum. How long is the string
What is the magnitude of the force that each sphere experiences, and is the force attractive or repulsive?(b) The spheres are brought into contact and then separated to adistance of 2.10 cm. Determine themagnitude of the force that each sphere now ..
A discus thrower (with arm length of 1.2 m) starts from rest and begins to rotate counterclockwise with an angular acceleration of 1.7 rad/s2. What is the magnitude of the discus's total acceleration?
You hold a ruler that has a charge on its tip 2 cm above a small piece of tissue paper to see if it can be picked up, What is the minimum charge required to pick up the tissue paper
An electron is released from rest at the negative plate of a parallel plate capacitor. The charge per unit area on each plate is ? = 1.81 10-7 C/m2, and the plates are separated by a distance of 1.38 10-2 m. How fast is the electron moving just be..
A 4.00-kg cylindrical reel with aradius of 0.600 m and a frictionless axle, starts from rest andspeeds up uniformly as a 2.00-kgbucket falls into a well, What is the linear acceleration of the falling bucket
a 120 g copper calorimeter cup contains 220 cm3 of water and 35 g of ice all in thermal equilibrium. a 185 g piece of
a length of aluminum wire has a resistance of 20.0 ? at 14.0degc. when the wire is warmed in an oven and reaches
A muscle builder holds the ends of a massless rope. At the center of the rope, a 7.9 kg ball is hung as shown. What is the tension in the rope
A circular coil (660 turns, radius = 0.036 m) is rotating in a uniform magnetic field. Find the magnitude of the magnetic field at the location of the coil
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