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At a point P a distance d from a point charge, the potential relative to infinity is V and the electric-field magnitude is E. If you now move to a point S at which the potential is 0.333 V, the electr
the pendulum oscillates about the equilibrium position shown by the solid line, with D = 0.300 m. Calculate the magnitude of the plane's acceleration.
An oil drop whose mass is determined to be 3.3x10^-15 is held at rest between two large plates separated by 1cm when the potential difference between them is 340 V.
An airplane has a mass of 2.4e6 kg, and the air flows past the lower surface of the wings at 85 m/s. If the wings have a surface area of 1200 m2, how fast must the air flow over the upper surface o
A potter's wheel having a radius 0.54 m and a moment of inertia 11.7 kg·m2 is rotating freely at 48 rev/min. The potter can stop the wheel in 8.0 s by pressing a wet rag against the rim and
A 13 g bullet is accelerated in a ri?e barrel 88 cm long to a speed of 453 m/s. Use the work-energy theorem to ?nd the average force exerted on the bullet while it is being accelerated.
A good baseball pitcher can throw a baseball toward home plate at 90 mi/h with a spin of 1510 rev/min. How many revolutions does the baseball make on its way to home plate? For simplicity, assume t
Compare and contrast Piaget's Cognitive-Development Theory and Vygotsky's Sociocultural Theory(major developmental theories).
A centripetal force of 250N acts on a 1,000kg satellite moving with a speed of 5,000m/s in a circular orbit around a planet. What is the radius of its orbit?
Charge is placed on two conducting spheres that are very far apart and connected by a long thin wire. The radius of the smaller sphere is 5 cm and that of the larger sphere is 12 cm. The electric f
A tank of water 3.0 m deep sits on a table 1.0m tall. A hole is located 2.0m from the bottom of the tank. Water flows out of the hole and strikes the ground. Where does it strike the ground? Assume
An electric circular saw is designed to reach its final angular speed, starting from rest, in 1.40 s. Its average angular acceleration is 380 rad/s2. Obtain its final angular speed.
How would you explain why we have different atmospheric pressure on different level(height) of earths atmosphere in molecular level (molecular behavior and what causes such behavior)?
Blocks of mass m_1 and m_2 are connected by a massless string that passes over the pulley in the figure . The pulley turns on frictionless bearings, and mass m_1 slides on a horizontal, frictionless
A 28g rifle bullet traveling 220m/s buries itself in a 3.7kg pendulum hanging on a 2.8m long string, which makes the pendulum swing upward in an arc. Determine the vertical and horizontal components
A 5.0 × 103 kg car accelerates from rest at the top of a driveway that is sloped at an angle of 16.0? with the horizontal. An average frictional force of 4.2×103 N impedes the car's moti
Determine (a) the average speed between t = 2.00 s and t = 3.00 s, (b) the instantaneous speed at t = 2.00 s and at t = 3.00 s, (c) the average acceleration between t = 2.00 s and t = 3.00 s.
In a dental X-ray machine a bean of electrons is accelerated by a potential difference of 10 kV. At the end of the acceleration, how much kinetic energy does each electron have if they start from re
If the price of electrical energy is 0.0673 dollars per kilowatt-hour, what is the cost of using electrical energy to heat the water in a swimming pool (14.7 m x 11.7 m x 1.54 m) from 12.3 to 25.3
A large fake cookie sliding on a horizontal surface is attached to one end of a horizontal spring with spring constant k = 390 N/m; the other end of the spring is fixed in place. The cookie has a k
Near Earth, the density of protons in the solar wind (a stream of particles from the Sun) is 12.0 cm-3, and their speed is 702 km/s. (a) Find the current density of these protons. (b) If Earth's mag
At what position (from the less massive object) can the 270-kg object be placed so as to experience a net force of 10 N towards the less massive object?
Calculate the momentum of the bullet immediately after the gun was ?red.
A 4.0-N force acts for 3.0 seconds on an object. The force suddenly increases to 15 N and acts for one additional second. What total impulse was imparted by these forces?
The sound level measured in a room by a person watching a movie in a home theater system varies from 65 dB during a quiet part to 95dB during a loud part. Approximately how many times louder is the