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Assuming the plant boiler, turbine, and electric generator have energy conversion efficiencies of 88%, 47%, and 99%, respectively, what is the electric energy output (in kWh) for every 1000 pounds o
A coal-fired electric power plant has a 2,000-megawatt electric power output and operates with an overall plant efficiency of 33%. This means energy is being derived from coal at a rate of 6,000 meg
Determine the kinetic frictional force that acts on the box when the elevator is (a) stationary, (b) accelerating upward with an acceleration whose magnitude is 1.83 m/s2, and (c) accelerating downw
A length of metal wire has a radius of 5.10 x 10-3 m and a resistance of 0.100 . When the potential difference across the wire is 15.0 V, the electron drift speed is found to be 3.17 x 10-4 m/s. On
(a) What is the ship's kinetic energy at this time? (b) How much work is required to stop it? (Include the sign of this value.) (c) What is the magnitude of the constant force required to stop it as
On June 14, 2005, Asafa Powell of Jamaica set a world's record for the 100-m dash with a time t = 9.77 s. Assuming he reached his maximum speed in 3 s, and then maintained that speed until the finis
If a speed of 40 is required for takeoff, what minimum length of runway is needed? Express your answer using two significant figures.
A projectile returns to its original height after 4.08 seconds, during which time it travels 76.2 meters horizontally. Determine what was the projectile's initial speed? (Use g = 9.80 m/s2)
Water has a mass per mole of 18.0 g/mol, and each water molecule (H2O) has 10 electrons. (a) How many electrons are there in 4 liters of water? (A liter is 1.00 10-3 m3) electrons (b) What is the ne
When the door is open and at rest, the door closer exerts a torque of 5.7 N*m. What is moment of inertia of the door in (kg*m^2)? and If you let go of the door what is its angular acceleration immed
Calculate the de Broglie wavelength of a 4.7 MeV ? particle emitted from an atomic nucleus whose diameter is approximately 1.4 multiplied by 10-14 m. Calculate its minimum kinetic energy according t
Twenty moles of a monatomic ideal gas (r = 5/3) undergo an adiabatic process. The initial pressure is 400 kPa and the initial temperature is 450 K. The final temperature of the gas is 320 K. What is
A 30uF capacitor initially charged to 20uF is discharged through a 2.2kohms resistor. How long does it take to reduce the capacitor's charge to 8.0uC ?
(a) What is the magnetic moment of the loop, and (b) what is the magnitude of the net torque exerted on the loop by the magnetic field?
A wire has a length of 7.05 × 10-2 m and is used to make a circular coil of one turn. There is a current of 5.47 A in the wire. In the presence of a 2.74-T magnetic field, what is the maximum
The vertical magnetic field has a magnitude of 0.052 T. The 0.17-kg aluminum rod (length = 1.6 m) slides without friction down the rails at a constant velocity. How much current flows through the ro
(a) What must be the direction of the current in the copper rod that causes the springs to stretch? (b) If the current is 14 A, by how much does each spring stretch?
(a) Find the magnitude of the magnetic force exerted on each side of the triangle. (b) Determine the magnitude of the net force exerted on the triangle.
When the wire is horizontal, it experiences no magnetic force. When the wire is tilted upward at an angle of 27°, it experiences a magnetic force of 2.5 × 10-3 N. Determine the magnitude o
Two blocks are attached by a massless rope over a frictionless pulley, and block M1 slides on the table without friction. The masses of the blocks are: M1 = 7.50kg and M2 = 4.30kg. Calculate the ten
An arch of 120 degrees carries a total charge of Q. The radius of the arch is R (ignore the thickness of the wire). What is the magnitude of the electric field at the center? The "center" is the sa
If it takes 25.0 J to increase the temperature of n moles of ideal He at fixed volume from 15.0 C to 85.0 C, the heat required to increase the temperature of n moles of ideal H2 at fixed volume by t
A proton starting from rest travels through a potential of 1.0 kV and then moves into a uniform 0.040-T magnetic field. What is the radius of the proton's resulting orbit? (mproton = 1.67 × 10
Three charges are located at the corners of a square of side a. The charge +q is located at the origin while charges -q are located at (a,0,0) and (0,a,0). How much energy is stored in the whole co
Calculate the force that must be applied by this arm to hold a package on the ramp. The ramp is at an angle of 31.5 degrees with the horizontal.