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(a) If a sample of gold with a mass of 2.478 g, is pressed into a leaf of 8.423 μm thickness, what is the area (in m2) of the leaf? (b) If, instead, the gold is drawn out into a cylindrical fiber
Two charges are placed on the x axis. One charge (q1 = +18.5 µC) is at x1 = +3.0 cm and the other (q2 = -13 µC) is at x2 = +9.0 cm. Find the net electric field (magnitude and direction)
A 1000-hertz tone issuing from a loudspeaker has an intensity level of 100 dB at a distance of 2.5 m. If the speaker is assumed to be a point source, how far from the speaker will the sound have und
The fastest growing plant on record is the Hesperoyucca whipplei. Suppose a plant of this type grows 1.8 m in 14 days. What is its growth rate in micrometers per second?
A tiny ball (mass = 0.013 kg) carries a charge of -16 µC. What electric field (magnitude and direction) is needed to cause the ball to float above the ground?
At a baseball game on a cool day (air temperature of 16oC), a fan hears the crack of the bat 0.25 s after observing the batter hit the ball. How far is the fan from home plate?
Determine when does the ring stop sliding and if it returns to the girl or keeps going it's original direction (to the right), assume the ring doesn't tip and the coefficient of friction is 0.3.
A tuning fork vibrates at a frequency of 256 Hz. What is the wavelength of the sound coming from the fork when the air temperature is a) 0oC and b) 20oC
The combined mass is shot horizontally off the cliff. With what speed does the mass hit the ground at the bottom of the cliff?
Find (a) the temperature of the gas and (b) the average kinetic energy of the gas molecules in the vessel (c) what additional information would you need if you were asked to find the average speed o
What are the three types of equilibrium? Provide an example from exercise or athletics for each type of equilibrium and something in the activity or sport you cited that normally attempts to disturb
Having already defined center of gravity in the laboratory exercise question, why does the center of gravity move in humans during athletic activities? Why is it important to be able to locate the c
The atomic mass of lithium-6 is 6.015123 u. How much energy is required to completely separate the nucleons in a lithium-6 nucleus?
Explain at least two key elements for producing ideas that you believe led the American colonists to the Boston Tea Party and the eventual American Revolution.
A 10Kg sign hangs from two wires. One wire makes an angle of 45 degrees and the other makes a 30 degree angle. What is the tension of the wires?
The piston and plunger are at the same height, and each has a negligible mass. By how much is the spring compressed from its unstrained position?
A pulley of radius 0.3 m is rotating counter-clockwise and is pulling a weight upward. The weight slows the spinning pulley so that it comes to rest. The angular acceleration is -2.10 R/s^2What was
A 0.45 kg mass vibrates according to the equation x = 0.49 cos 8.45t, where x is in meters, and t is in seconds. (a) Determine the amplitude. (b) Determine the frequency. (c) Determine the total energ
A mass m at the end of a spring vibrates with a frequency of 0.92 Hz. When an additional 609 g mass is added to m, the frequency is 0.58 Hz. What is the value of m?
Two charges attract each other with a force of 2.5 N. What will be the force if the distance between them is reduced to one-ninth of its original value?
Determine the height of the hill above the valley floor. Treat the positive direction as to the right. Solve symbolically if there had been enough info given to to determine the initial velocity of
A vertical glass tube of length L= 1.28 m is half filled with a liquid at 20 C. How much will the heigh of the liquid column change when the tube and liquid are heated to 30 C? Use coefficients a gl
It is estimated that in the United States (population 250 million) there is one electric clock per person, with each clock using energy at a rate of 3.5 W. Using this estimate, how much energy is co
Dangerous dan, a scottish bricklayer, throws a brick as hard as he can, at 100 m/s srraight up in the air. What is the maximum height of the brick?
The gravitational force of attraction between two students sitting at their desks in physics class is 3.02 multiplied by 10-8 N. If one student has a mass of 49.2 kg and the other student has a mass