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The coefficients of static and kinetic friction between the wood and wall are 0.45 and 0.30, respectively. The wood slides down unless the applied force has magnitude 13 N. What is the mass of the b
A car can decelerate at -4.00 m/s2 without skidding when stopping on a level road. What would be the magnitude of its deceleration if the road were inclined at 15° uphill?
A cord to a pail of water, and the pail is swung in a vertical circle of radius 0.600 m. what must be the speed of the pail at the point of the circle if no water is to spill from it?
What is the smallest amount of time in which the person can accelerate the car from rest to 12 m/s and still keep the coffee cup on the roof?
At a distance from a point charge, the electric potential is 3400 and the magnitude of the electric field is 2.0×105 . What is the distance ? What is the electric potential at distance from the
Bicyclists in the Tour de France do enormous amounts of work during a race. For example, the average power per kilogram generated by Lance Armstrong (m = 75.0 kg) is 6.50 W per kilogram of his body
(a) Draw a free body diagram of the radio and the forces on it. (b) Calculate the acceleration on the radio. Express your answer in component and magnitude angle notation.
Radio astronomers detect electromagnetic radiation at 44.0 MHz from an interstellar gas cloud. They suspect this radiation is emitted by electrons spiraling in a magnetic field. What is the magnetic
What is the magnitude of the minimum horizontal force needed to prevent the block from falling if the coefficient of friction between the wall and the block is µs = 0.40?
What is the minimum coefficient of static friction between the block and the ramp if the block is not to slide back down the ramp?
Compare Gauss's law for electric and magnetic fields in terms of the meaning of the mathematical expressions, what they are used for, the quantities they describe and their units of measure, and how
In this position, she presents the maximum cross-sectional area and thus maximizes the air-drag force on her. (a) What is the magnitude of the drag force on the sky diver?
The switch in the circuit shown below is open for t<0 and is then thrown closed at time t = 0. Find the current in the conductor in the inductor and the current in the switch as a function of tim
A hollow cylinder (hoop) is rolling on a horizontal surface at speed v = 4.3 m/s when it reaches a 11° incline. (a) How far up the incline will it go?
A railroad diesel engine weighs five times as much as a freightcar. If the diesel engine coasts at 4 km/h into a freightcar that is initially at rest, how fast do the two coast after they couple tog
By how much does the ball clear or fall short of clearing the crossbar?
A 18.0-N weight slides down a rough inclined plane which makes an angle of 29.0 with the horizontal. The weight starts from rest and gains a speed of 15.0 m/s after sliding 150 m. How much work is d
A race car goes around a level, circular track with a diameter of 1.00 km at a constant speed of 77 km/h. What is the car's centripetal acceleration in m/s^2? Compare this answer with the accelerati
If you drop an object from a height of 1.5 m, it will hit the ground in 0.56 s. If you throw a baseball horizontally with an initial speed of 15 m/s from the same height, how long will it take the b
The lense of a slide project has a focal length of 10 cm. It is used to project the image of a 35 mm slide (24 mm x 36 mm) on a square screen located 6m away. Of the following screen width, what is
Two converging lensees, the first with focal length 25 cm and second with the focal length 20 cm, are separated by 30 cm. A 4 cm tall object is placed 50 cm infront of the first lens. What is the hi
A 5 kg box with initial speed 4 m/s slides across the floor and comes to a stop after 0.7 sec. a. What is the coefficient of kinetic friction ? b. How far does the box move ?
A computer disk drive is turned on starting from rest and has constant angular acceleration. If it took 0.540 for the drive to make its second complete revolution, how long did it take to make the f
A circular coil of wire 8.20 cm in diameter has 15.0 turns and carries a current of 3.20 A. The coil is in a region where the magnetic field is 0.650 T . Part A: What orientation of the coil gives t
A 10.7kg ball travels at 3.5m/s west when strikes a stationary 2.4kg ball. the larger ball moves off at 2.1m/s 45 degrees north of west, while the lighter ball moves off at an unknown velocity. What