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The sledge moves a distance of 20.7 m on a horizontal surface. The coefficient of kinetic friction between the sledge and surface is 0.500. (a) What is the tension in the rope? (b) How much work is
What is her kinetic energy at maximum height? What is the gravitational potential energy associated with the athlete?
A comet is observed to pass the sun at a distance of closest approach of 4 x10^10 m with a speed of 3 x 10^4 m/s. Will it return, and how long will it take to move 60º arounds its orbit from th
Two long straight wires are parallel and carry current in opposite directions. The currents are 10 amps and 15 amps and the wires are separated by 0.40cm. What is the magnetic field due these curren
An inductor of 3H and resistance of 6 ohms are connected to a battery of emf 12V and of negligible internal resistance. Calculate: (i) the initial rate of increase of current
What should the thickness of the material be for it to be nonreflecting for light of wavelength 640 nm (in nanometers)?
Two sources of light of wavelength 780 nm are 13.0 m away from a pinhole of diameter 0.100 mm. How far apart must the sources be for their diffraction patterns to be resolved by Rayleigh's criterion
A film of oil of index of refraction n = 1.37 floats on water (n = 1.33). When illuminated with white light at normal incidence, light of wavelengths 672 and 480 nm is predominant in the reflected l
A 2.97-kg projectile is fired with an initial speed of 133 m/s at an angle of 28° with the horizontal. At the top of its trajectory, the projectile explodes into two fragments of masses 0.97 kg
Find an expression for the maximum safe period of rotation, T, in terms of the variables given above, and the gravitational acceleration, g.
(a) Determine the acceleration due to gravity at that height and find the orbital velocity and the period of the space station. (b) The Hubble Space Telescope orbits at 600 km. What is the telescope
Find the minimum speed at which a car can travel around this curve without skidding if the coefficient of static friction between the road and tire is 0.3. Answer in units of m/s.
A rock of mass m = 2.5 kg is tied to the end of a string of length L=1.2m.Theotherendofthe string is fastened to a ceiling, and the rock is set into motion so that it travels in a horizontal circle
If the tension in the string is zero when the rock is at its highest point (so that the string just barely goes slack), what is the tension when the rock is at the bottom?
A coin is sitting on a record. It is found that the coin slips off the record when the rotation rate is 0.30 rev/s. What is the coefficient of static friction between the coin and the record?
a) If the contact time is 3.00 , calculate the magnitude of the average force on the ball during the contact. b) Calculate the direction of the average force on the ball during the contact.
Two cylinders with exactly the same shape. One is made up of steel,the other is made up of wood. Which one has larger moment of inertia?Why?
A 237-kg crate is being pushed across a horizontal floor by a force P that makes an angle of 47.1 ° below the horizontal. The coefficient of kinetic friction is 0.217. What should be the magnitu
Find the internal magnetic field experienced by the electron in a hydrogen atom.
A tuning fork is placed next to a 15cm pipe creating the resonant standing wave seen below at two different times. The air inside is at room temperature. What is the frequency of the tuning fork?
The surrounding conductor has an inner diameter of 7.27 mm and a charge of -8.10 µC. Assume the region between the conductors is air. What is the potential difference between the two conductors
A 15cm flute has a standing wave as seen in several snapshots below. Time is measured in seconds and the speed of sound is 343 m/s. a) Identify the nodes and anti-nodes. b) Determine the harmonic nu
If three unequal capacitors, initially uncharged, are connected in series across a battery, which of the following statements is true? a) The largest voltage appears across the capacitor with the sm
A capacitor with very large capacitance is in series with another capacitor with very small capacitance. What is the equivalent capacitance of the combination?
Assuming that the distance between pairs of alpha particles is 3.0 x 10^-15 m, what is the electric energy (in eV) of this arrangement of alpha particles? Treat the alpha particles as pointlike part