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A pendulum consists of a small object hanging from the ceiling at the end of a string of negligible mass. The string has a length of 0.76 m. With the string hanging vertically, the object is given an initial velocity of 2.8 m/s parallel to the ground and swings upward in a circular arc. Eventually, the object comes to a momentary halt at a point where the string makes an angle ? with its initial vertical orientation and then swings back downward. Find the angle ?.
Nine electrons are injected into a one-dimensional energy well with a width of 2 nm. (a) What will be the quantum numbers and energies of each of the nine electrons? (b) What is the lowest-energy photon that can now be absorbed by electrons in this e..
A certain substance has a dielectric constant of 2.8 and a dielectric strength of 18.0 MV/m. If it is used as the dielectric material in a parallel-plate capacitor, what minimum area should the plates of the capacitor have to obtain a capacitance of ..
A block with mass m1 = 9.4 kg is on an incline with an angle ? = 33.0° with respect to the horizontal. For the first question there is no friction between the incline and the block. When there is no friction, the magnitude of the acceleration of t..
An asteroid of mass 2.3×10^5kg , traveling at a speed of 21km/s relative to the Earth, hits the Earth at the equator tangentially, estimate the percent change in the angular speed of the Earth
The maximum charge on the capacitor in an oscillating LC circuit is Q0. What is the capacitor charge, in terms of Q0, when the energy in the capacitor's electric field equals the energy in the inductor's magnetic field? Give your answer in terms of Q..
Use the data of this table to find the point between Jupiter and the Sun at which an object can be placed so that the net gravitational force exerted by Jupiter and Sun on this object is zero
An LC circuit has a 9.00 m/H inductor. The current has its maximum value of 0.550 A at t= 0s . A short time later the capacitor reaches its maximum potential difference of 62.0 V. What is the value of the capacitance?
A 1300-kg car is being driven up a 4.0° hill. The frictional force is directed opposite to the motion of the car and has a magnitude of f = 530 N. A force Farrowbold is applied to the car by the road and propels the car forward.
A shell is shot with an initial velocity v1 of 33 m/s, at an angle of 60° with the horizontal. At the top of the trajectory, the shell explodes into two fragments of equal mass (Fig. 8-26). One fragment, whose speed immediately after the explosion is..
A luge and its rider, with a total mass of 81 kg, emerge from a downhill track onto a horizontal straight track with an initial speed of 30 m/s. If a force slows them to a stop at a constant rate of 3.9 m/s2, (a) what magnitude F is required for the ..
Measurements of the radioactivity of a certain isotope tell you that the decay rate decreases from 8305decays per minute to 3080 decays per minute over a period of 5.00 days
An alpha particle (a helium nucleus) is traveling along the positive x-axis at 1350 m/s, How far does the particle travel before hitting the tube wall
An earth satellite moves in a circular orbit with an orbital speed of 6100. Find the radial acceleration of the satellite in its orbit
A charge of 6.22 mC is placed at each corner of a square 0.170 m on a side. Determine the magnitude of the force on each side
An electron is brought to a point 0.1 m from the center of the sphere. What is the force acting on the electron (magnitude and direction) ? What is the electric field (magnitude and direction ) at the point where the electron is located
What is the magnitude of the negative point charge that must be fixed to the fourth corner, so that the charge at the diagonally opposite corner experiences a net force of zero?
An electron is a subatomic particle (m = 9.11 10-31 kg) that is subject to electric forces. Find the magnitudes of the net force acting on the electron
A parallel plate capacitor has plates that measure 13.5cm long by 9.75cm wide, if this capacitor is placed into a circuit with 9.50V applied to it, how much energy can the capacitor store
An alpha particle with kinetic energy 17 MeV makes a head-on collision with a lead nucleus at rest. What is the distance of closest approach of two particles.
q1. a 130 block on a frictionless table is firmly attached to one end of a spring with 40. the other end of the spring
a 1cm high object is placed 20cm to the left of a converging lens f(focal length)=10cm. where is the final image and how high is it
An electron enters a magnetic field of 0.7 T, moving perpendicular to it with a speed of 5·105 m/s. If an electron were sent at the same speed, but at an angle of 70o to the magnetic field.
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