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A spring attached to the ceiling of an elevator is 10 cm long when nothing is hanging from it. It is 12 cm long when a certain mass is hanging from it and the elevator is at rest. How long will the spring be if the elevator moves downwards with a decreasing speed of 6m/s^2? What if the elevator moves upwards with a decreasing speed of 6m/s^2?
At 12°C, a brass cube has an edge length of 25 cm. What is the increase in the cube's surface area when it is heated from 12°C to 97°C
An air mass has a temperature of 68F and 970hPa with a mixing ratio of 5 g/kg. Without any condensation or mixing the air mass now has a temperature of 50F and a pressure of 750hPa. Find the initial and final values of a) r, b) T(dew), and c) vapor p..
When a wavelength is 300nm, its stopping potential is 1.10V. When it is changed to 200nm, the stopping potential is 3.06V. What value does this experiment yield for Planck's constant
A solid sphere, solid cylinder and hoop all with the same mass M and radius R roll down an incline without slipping. Determine by how much time the sphere beats the cylinder
A heat engine operates between a reservoir at 28°C and one at 432°C. What is the maximum efficiency possible for this engine
A proton with v = 374 m/s is moving through a region in which the magnetic field is B = 2.8 T. what angle does the protons velocity make with B
How much current would be through a copper wire of length 10 m and a diameter of 1 mm, which is connected parallel to a battery of 12 V
An ac generator with a frequency of 1.04 kHz and an rms voltage of 22.2 V is connected in series with a 2.20 k omega resistor and a 320mH inductor. What is the power factor for this circuit? cos (phi)
A plane flies at 234 mi/hr (air speed) in the direction northeast; there is a wind of 51 mi/hr (ground speed) in the direction southeast. How far will the plane fly in 94 minutes
The plates of a parallel-plate capacitor have a separation of 4.70mm , and each has an area of 13.4cm^2 . what is the potential difference between the plates
A 47.60 g golf ball is driven from the tee with an initial speed of 56.0 m/s and rises to a height of 28.4 m. (a) avoid air resistance and determines the kinetic energy of ball at its highest point. (b) What is its speed while it is 8.02m below it..
Charges 6.8 ?C, 6.1 ?C, and -1.5 ?C are brought from infinity to the respective vertices of an equilateral triangle with 11.0 cm sides. What is the potential at the center of the triangle
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