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A loudspeaker of mass 23.0 m is suspended a distance of h = 1.20 m below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 2.90 m.
It depends on the mass of the spaceship. A communications satellite orbits at 400 km above the surface of the Earth. What is its period?
A solid sphere rolls without slipping across a horizontal surface with an initial angular speed of 7.50 rad/s. The mass of the sphere is 5.38kg and its radius is 0.455m. The sphere then rolls up an
The block is released 1.0 rm m above the ground. Use Newton's second law to find the speed of the block as it hits the ground.Use conservation of energy to find the speed of the block as it hits the
The time it takes to complete 1 cycle, T. Units? [s] Frequency: # of complete cycles per unit time, f. Units? What is the amplitude, period, and frequency of the following motion? Period?
After a 0.270-kg rubber ball is dropped from a height of 1.85 m, it bounces off a concrete floor and rebounds to a height of 1.35 m. Determine the magnitude and direction of the impulse delivered to
A pendulum bob is released from some initial height such that the speed of the bob at the bottom of the swing is 1.1 m/s. The acceleration of gravity is 9.81 m/ What is the initial height of the bob
A 30.0 kg gun is resting on a frictionless surface. The gun fores a 50.0 g bullet with a muzzle velocity of 310.0 m/s. a) Calculate the momenta of the bullet and the gun after the gun is fired.
A harmonic wave is traveling along a rope. The oscillator that generates the wave completes 49.0 vibrations in 28.4 s. A given crest of the wave travels 406 cm along the rope in a time period of 11
Light of wavelength 450 nm falls on a 0.48 mm wide slit and forms a diffraction pattern on a screen 1.1 m away.
The minimum distance required to stop a car moving at 38.0 mi/h is 41.0 ft. What is the minimum stopping distance for the same car moving at 68.0 mi/h, assuming the same rate of acceleration?
A ship sets out to sail to a point 212 km due north. An unexpected storm blows the ship to a point 156 km due east of its starting point. How far must it now sail to reach its original destination?
Calculate the volume in metres cubic of a stone whose mass is 540 grams and density is 1600 kilograms per metres cubic ?
Waves moving on a lake have a speed of 2.2 m/s and a distance of 1.4 m between adjacent crests. (a) What is the frequency of the waves? (b) Find the period of the wave motion.
Three equal point charges, each with charge 1.00 mu C, are placed at the vertices of an equilateral triangle whose sides are of length 0.550 m. What is the electric potential energy U of the system?
A geologist uses a simple pendulum that has a length of 37.10 cm and a frequency of 0.8190 Hz at a particular location on the Earth. What is the acceleration of gravity at this location?
Two horizontal forces, 220 N and 163 N, are exerted on a canoe. If the these forces are applied in the same directions, find the net horizontal force on the crate.
An 80 kg spacewalking astronaut pushes off a 640 kg satellite, exerting a 100N force for the 0.50 s it takes him to straighten his arms. How far apart are the astronaut and the satellite after 1.00
A charge of -280e is uniformly distributed along a circular arc of radius 3.85 cm, which subtends an angle of 35°. What is the linear charge density along the arc?
An electric ?eld of magnitude 1820 N/C is applied along the x axis. Calculate the electric ?ux through a rectangular plane 0.364 m wide and 0.62 m long if the plane is parallel to the yz plane
Niels Bohr, a Danish physicist applied Planck"s ideas, and realised that the energy levels were quantised. Is there any proof for Bohr"s ideas and what does de Broglie have to do with it all?
A block with mass m = 13.7 kg slides down an inclined plane of slope angle 15.9 ° with a constant velocity. It is then projected up the same plane with an initial speed 4.50 m/s. How far up the
A wire loop of radius 0.30m lies so that an external magnetic field of magnitude 0.30T is perpendicular to the loop. The filed reverses its direction, and its magnitude changes to 0.20T in 1.5s. Fi
In order to simulate weightlessness for astronauts in training, they are flown in a vertical circle. If the passengers are to experience weightlessness, how fast should an airplane be moving at the
A cylindrical shell of radius 7.3 cm and length 258 cm has its charge density uniformly dis-tributed on its surface. The electric field intensity at a point 27.5 cm radially outward from its a