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The efficiency of a certain machine is 0.50. If the cold temperature is 527 degrees celsius, what is the HOT temperatur
An outside loudspeaker (considered a small source) emits sound waves with a power output of 120 W. Find the intensity level in decibels at that distance
oscillating voltage applied to an LRC circuit, V=110cos(120Ï€t), R = 1kΩ, L = 10mH, C = 4700 µF. find the phasor angle
An air-filled capacitor consists of two parallel plates, each with an area of 7.60 cm2, separated by a distance of 1.70 mm. evaluate the electric field between the plates
A 0.50 kg block rests on the icy surface of a frozen pond, which you can assume to be frictionless. what is the minimum uncertainty in the block's speed
A mass m slides in the bottom of a hemispherical bowl of radius R under the influence of gravity. Find the constraint force
A piece of glass has a thin film of gasoline floating on it. A beam of light is shining perpendicular on the film. what is the minimum nonzero thickness of the film
A solid disk (mass = 5 kg, R=0.6 m) is rolling across a table with a translational speed of 9 m/s. What is the total kinetic energy of the disk
The intensity I of light from an isotropic point source is determined as a function of distance r from the source. What is the power of the source
Suppose that the spin magnetic quantum number ms had three possible values, rather than two. how many electrons would it take to fill the K shell
A vertical spring (spring constant =165 N/m) is mounted on the floor. A 0.390-kg block is placed on top of the spring, Obtain the frequency (in Hz) of the motion
A microphone is attached to a spring that is suspended from the ceiling, as the drawing indicates. determine the amplitude of the simple harmonic motion
Consider four 8 · µC charges placed at the corners of a square, which is 2.1 ·m on a side. The charges on the top are both positive, Find the electric field at the center of the s
A particular Bohr orbit in a hydrogen atom has a total energy of -0.85eV. What is the kinetic energy of the electron in this orbit
An object of height 4.7 cm is placed 47 cm from a convex mirror of focal length having magnitude 39 cm. describe the properties of the image
Calculate the rotational inertia of a meter stick, with mass 0.576 kg, about an axis perpendicular to the stick and located at the 29.9 cm mark
A target glider, whose mass m2 is 320 g, is at rest on an air track, a distance d = 53 cm from the end of the track. A projectile glider, How much more time elapses before the gliders collide again
Which one of these (if not all) of theses are depleated with the HIV infection and what is the role of Helper T-cells in combating a viral infection?
A freezer is used to freeze 2.0 L of water completely into ice. The water and the freezer remain at a constant temperature of T = 0 C, Determine the change in the entropy of the freezer
A particular engine has a power output of 4.00 kW and an efficiency of 25.0%. Assume the engine expels 7000 J of energy in each cycle. Find the time required to complete each cycle
A thermodynamic system undergoes a process in which its internal energy increases by 480 J. find the energy transferred to or from it by heat
A Styrofoam cup holding 109 g of hot water at 1.00 x 10 Ccools to room temperature 21.8 C, What is the change in entropy of the room
A 80cm long metal string under 34.5 N tension has a linear mass density 2.10x10^-4 kg/m. Find the frequencies of the first three harmonics
The driver of one car sounds a 365 Hz frequency horn and the driver of the other car hears a frequency of 392 Hz, Determine the speed of both cars
A heat engine using a diatomic ideal gas goes through the following closed cycle: Isothermal compression until the volume is halved. What is the thermal efficiency of this heat engine