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A Carnot engine with a hot-reservoir temperature of 380 degree C has the same thermal efficiency. What is the cold-reservoir temperature in degree C.
If you had one of the proton , in a uniform electric field, in a vacuum chamber near the earth's surface (so that you cannot ignore gravity), what electric field would be required to give the partic
A newly proposed device for generating electricity from the sun is a heat engine in which the hot reservoir is created by focusing sunlight on a small spot on one side of the engine. The cold reserv
Assume the room temperature is 20°C. A) What is the highest frequency heard by a student in the classroom? (in Hz) B) What is the lowest frequency heard by a student in the classroom? (in Hz)
On the other hand, if the red car has a constant velocity of 42.0 km/h, they pass each other at x = 76.0 m. What are (a) the initial velocity (in km/h)
A taut rope has a mass of0.165kg and a length of3.80m. What power must be supplied to the rope in order to generate sinusoidal waves having an amplitude of0.100m and a wavelength of0.520m and trave
What is the net displacement of an element at a point on the string where two pulses are crossing, if the string is rigidly attached to the post?
A speaker at an open-air concert emits 600 W of sound power, radiated equally in all directions. What is the intensity of the sound 5.50 m from of the speaker?
A 60 kg skier leaves the end of a ski-jump ramp with a velocity of 24 m/s directed 25 degrees above the horizontal.
What is the change in the gravitational potential energy of the snowball-Earth system during the flight?
A krypton laser produces a cylindrical red laser beam 2.0 mm in diameter with 2.0 W of power. What is the light intensity on a wall 2.4 m away from the laser?
The element heats up to 785° C, with the potential difference constant. Find the final current. (The temperature coefficient of resistivity of Nichrome is 4.0 10-4 (°C)-1.)
When traveling at 1.50 m/s, you notice that exactly two waves are hitting the boat from behind every 14.0 s. What is the speed of the waves on the lake? (in m/s)
A female orb spider has a mass of 0.45 g. She is suspended from a tree branch by a 1.2 m length of 0.0020mm diameter silk. Spider silk has a density of 1300 kg/m^3. If you tap the branch and send a
Particles in a Gold Ring. You have a pure (24-karat) gold ring with mass 15.0 g. Gold has an atomic mass of 197 g/mol and an atomic number of 79. How many protons are in the ring?
An electron in an oscilloscope is accelerated as a result of the potential difference between the cathode and anode. The electron has negligible initial speed and a final speed of 2.90 x 107 m/s. F
Find the capacitance for a cylindrical jar of height 18 cm and radius 6 cm, made of 1 mm thick Pyrex glass. (The dielectric strength of the Pyrex glass is 1.00 107 V/m.)
Assume that the rate of charge flow in a lightning bolt is about 16000 C/s and this lasts for 105 µs or less. How much charge flows between the ground and the cloud in this time?
A rock climber stands on top of a 52 m high cliff overhanging a pool of water. He throws two stones vertically downward 1.0 s apart and observes that they cause a single splash. The initial speed of
An observer viewing the slides from above sees a series of thin, straight, alternating light and dark fringes, with 113 bright fringes spread over the 4.55 cm length of the slides. Find the diameter
(Because the angle is small, the back and forth swings do not cause any appreciable change in the length of the spring.) What is the unstretched length of the spring (i.e., without the apple attache
An object of unknown mass is attached to an ideal spring with force constant 120 N/m and is found to vibrate with a frequency of 6.00 Hz. 1) Find the period 2) Find the angular frequency 3) Find th
What is the power in megawatts (MWs) of a three-loop PWR with the following system parameters: -Each loop has a flow rate of 90,000 gpm of water. -The hot leg is 610°F and the cold leg is 550&d
They make a totally inelastic collision with the plate and set the scale into vertical simple harmonic motion (SHM).
A stone is dropped in the water from a bridge at a height of 44.5 m above the water. Another stone is thrown vertically down 1.00 s after the first one. Both hit the surface of the water at the sam