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An electron on from the sun enters the earth's magnetic field high above its surface and undergoes a cicular motion. Calculate the raduis of the circle, if at this high elevation earth's magnitic field is 3E-7 T and the electron's speed is 2E-8 m/s.
A certain car is capable of accelerating at a rate of 0.63 m/s2. How long does it take for this car to go from a speed of 56 mi/h to a speed of 60 mi/h.
A spider of mass m is sitting in a perfectly symmetric web (in a vertical plane with 45 angles between the web lines), where Ti's denote the tensions along the lines that are connected to the spider at the center with i = 1, 2, 3, 4, 5, 6, 7, 8. The ..
A 50.0 g silver spoon at 20.0 C is placed in a cup of coffee at 90.0 C. How much heat does the spoon absorb from the coffee reach a temperature of 89 C.
The height of a helicopter above the ground is given by h = 3.00 t3, where h is in meters and t is in seconds. After 2s, the helicopter releases a small mailbag. How long after its release does the mailbag reach the ground.
An incompressible fluid flows steadily through a pipe that has a change in diameter. The fluid speed at a location where the pipe diameter is 8 cm is 1.28 m/s. What is the fluid speed at a location where the diameter has narrowed to 4.00 cm.
A 12-V battery causes a current of 0.80A through a resistor, How many joules of energy does the battery lose in a minute
A 20.0 ?, 9.00 ?, and 9.00 ? resistor are connected in parallel to an emf source. A current of 6.00 A is in the 9.00 ? resistor. Calculate the equivalent resistance of the circuit
Three resistors, 27, 49, and 79 ?, are connected in series, and a 0.51-A current passes through them. What is the potential difference across the three resistors
What is the highest value of the magnetic force.
What is the electric potential energy of a system that consists of two protons 2.0×10?15 apart-as might occur inside a typical nucleus?
A 23.0-N block rests on a horizontal surface. The coefficients of static and kinetic friction between the surface, What is the force of friction acting on the block if T = 20.56 N
The volume control on a surround-sound amplifier is adjusted so the sound intensity level at the listening position increases from 23 to 61 dB
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