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Rubber stopper attached to one end of a string and 100g mass attached to the other end. A student gets the rubber stopper going in a horizontal circle above her head. The radius of the circle mainta
A rotating cylinder about 16 km in length and 6.0 km in diameter is designed to be used as a space colony. With what angular speed must it rotate so that the residents on it will experience the sam
You are behind the butterfly, 82 cm from the mirror. What is the distance between your eye and the image of the butterfly in the mirror?
we can ignore the mass of this rope as well. the whole system moves to the right, with an acceleration of 4 m/s^2. determine the tension of both ropes.
A skier wears a jacket filled with goose down that is 15mm thick. Another skier wears a wool sweater that is 7.0mm thick. Both have the same surface area. Assuming the temperature difference betwee
On a workday the average decibel level of a busy street is 74 dB, with 123 cars passing a given point every minute. If the number of cars is reduced to 32 cars every minute on a weekend,
What types of lifestyle changes would be brought about by living in a house whose space heating and hot water needs are supplied almost entirely by the sun?
Why might a physician perform a Gram stain on a sample from a sick patient before prescribing an antibiotic?
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.