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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
What are the magnitude and direction of the vertical force (use up as the positive direction) exerted by the pole on the firefighter?
Vector A has a magnitude of 6 m and makes an angle of 28 degrees with the positive x axis. Vector B also has a magnitude of 4 m and is directed along the negative x axis. Enter your answers in dist
A small glass bead charged to 7.4nC is 4.0cm from a thin, uniformly charged, 10--cm long glass rod. The bead is repelled from the rod with a force of 900*10^-6N . What is the total charge |Q| on th
A wind force with component Fx acts on the skier. (Indicate the direction with the sign of your answer.) (a) What is Fx if the magnitude of the skier's velocity is constant?
What is the least coefficient of static friction between the cat and the merry-go-round that will allow the cat to stay in place, without sliding?
A circular-motion addict of mass 85 kg rides a Ferris wheel around in a vertical circle of radius 10 m at a constant speed of 6.0 m/s. (a) What is the period of the motion?
The axes of the wire and the cylindrical shell coincide. The wire carries a charge per unit length 8.80E-6 C/m and the shell carries a charge per unit length -1.76E-5 C/m. Find the magnitude of the
How long will it take a sample of polonium-210 with a half-life of 140 days to decay to one-sixteenth of its original strength?