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Near Earth the density of protons in the solar wind(a stream of particles from the Sun) is 8.70 cm-3 and their speed is 470 km/s. Find the current density of these protons.
A particle with a mass of 2.00e-16 kg and a charge of 29.0 nC starts from rest, is accelerated by a strong electric field, and is fired from a small source inside a region of uniform constant magne
A solenoid of radius 1.1 cm produces a magnetic field at its center is 0.28 T. What is the magnetic flux through the center of the solenoid?
The weight of the rod is 50 N and there is no friction between the rod and the wall or the rod and the floor. Calculate the horizontal force F applied at the lower end of the wall so that the rod do
A 23.5 kg gold bar at 27.0°C is placed in a large, insulated 0.800 kg glass container at 15.0°C with 2.00 kg of water at 25.0°C. Calculate the final equilibrium temperature.
What is the speed of electrons in the beam? What acceleration do they experience due to the magnetic field, assuming that it is perpendicular to their path? What is this acceleration in units of g?
a tennis ball rolls off the egde of a table top 0.750m above the floor and strikes the floor at a point 1.40m horizontally from the edge of the table. a) find the time of flight of the ball. b)find
A certain merry-go-round is accelerated uniformly from rest and attains an angular speed of 1.2 rad/s in the first 18 seconds. If the net applied torque is 1200 N × m, what is the moment of i
32g of copper pellets are removed from a 300 degrees C oven and immediately dropped into 120 mL of water at 25 degrees C in an insulated cup. What will the new water temperature be?
What is the minimum coefficient of friction between tires and road that will allow cars to take the turn without sliding off the road? (Assume the cars do not have negative lift.)
At a certain point in a horizontal pipeline, the water's speed is 2.50 m/s and the gauge pressure is 1.70×10^4 Pa. Find the gauge pressure at a second point in the line if the cross-sectional
A uniform rod AB 3m. long weighing 3kg is held horizontally by two strong vertical strings at its ends. Make the free body diagram of rod & (b) Find the tension in two strings"
A refrigerator with a coefficient of performance of 1.99 absorbs 3.96×10^4 J of heat from the low-temperature reservoir during each cycle.
A whistle of frequency 650 Hz moves in a circle of radius 69.0 cm at an angular speed of 12.0 rad/s. Use 343 m/s for the speed of sound in air. What are the lowest and the highest frequencies heard
A 51.0kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 250N . For the first 10.5m the floor is frictionless, and for the next 10.5m the coefficient of frict
Starting with the general energy balance and explaining what terms are zero or cancel, determine the power in kW needed.
A 2kg rock is released from rest at a height of 29m. ignore air resistance and determine the kinetic energy, gravitational potential energy, and total mechanical energy at each of the following hei
A 225-kg crate is pushed horizontally with a force of 685 N. If the coefficient of friction is 0.20, calculate the acceleration of the crate.
The water flows through a 3-inch inside diameter tube at 40 lb/second. Starting with the general energy balance. Determine the power that is required by the pump in hp?
A bat emits a sound whose frequency is 96 kHz. The speed of sound in air at 20.0° C is 343 m/s. However, the air temperature is 35° C, so the speed of sound is not 343 m/s. Assume that air
A certain medical machine emits x-rays with a minimum wavelength of 0.025 nm. One day, the machine has an electrical problem and the voltage applied to the x-ray tube decreases to 80% of its normal
A 75 kg snowboarder has an initial velocity of 5 m/sec at the top of a 28 degree incline. after sliding down the 110 m incline which has a kinetic coefficient of friction of 0.18, the snowboarder ha
an electric field with a magnitude of 2.8 E 4 N/C at a certain location, points due south. If a charge of -4.0 E -6 C is brought to the location, what is the electrostatic force that acts on t
A ladder 6.80 m long leans against the side of a building. If the ladder is inclined at an angle of 80.0° to the horizontal, what is the horizontal distance from the bottom of the ladder to the
How much work is done by gravity when a pine cone (of mass 50g) falls from the top of a tree, 9 m high?