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What would be the formula f(t) for a sine function that has twice the amplitude of the above wave and a frequency of 1000 Hz?
The permittivity of free space is 8.85 × 10-12 C2/N · m2. Neglecting the curvature of the earth, cal- culate the volume charge density of the at- mosphere assuming it to be uniform betw
An AC power generator produces 50 A (rms) at 3 600 V. The voltage is stepped up to 100 000 V by an ideal transformer and the energy transmitted through a long-distance power line with a total resist
When 950 A of current is in each rod in the same direction, the spring is observed to be compressed by 2.0 cm. Treat the rods as long, straight wires and find the separation between them when the cu
A sailor on the deck of the ship sights the top of the lighthouse at an angle of 30o above the horizontal. If the sailor"s eye is 14 ft above the water, how far is the ship from the rocks?
How do your calculations support the importance of stepping voltages up with transformers for long-distance transmission?
A sports car accelerates from rest to 90 mph in 6.2 seconds. (60 mph = 88 ft/s) What is its average acceleration in ft/s2? B) The same sports car is advertised to be able to stop in a distance of 50
In heavy rush-hour traffic you drive in a straight line at 12 m/s for 1.5 minutes, then you have to stop for 3.5 minutes, and finally you drive at 15 m/s for another 2.5 minutes. Calculate the avera
If instead, the dipole rotates from orientation (1) to orientation (4), is the work done on the dipole by the field more than, less than, or the same as in (f)?
You tie a string to a rock and twirl it at a constant speed in a horizontal circle with a radius of 1.30 m, 2.10 m above the ground. The rock comes loose and travels as a projectile a horizontal di
Railroad car of mass M is moving at a speed of V when it collides with a second railroad car of mass M which is at rest. The two cars lock together instantaneously and move along the track. what is
An ideal fluid is moving at 3.0 m/s in a section of a pipe of radius 0.20 m. If the radius in another section is 0.35 m, what is the flow speed there?
A car traveling at a speed of vo = 45 m/s stops smoothly (that is, its deceleration is constant) over a distance of d = 179 m. What is its acceleration during the time that it is stopping?
A raft is made of 20 logs lashed together. Each is 61 in diameter and has a length of 7.4 . How many people can the raft hold before they start getting their feet wet, assuming the average person h
He hears the sound of the splash 3.78 s later. The acceleration of gravity is 9.8 m/s2 and the speed of sound in air is 327 m/s. How deep is the well?
On a level road with its brakes on, a car traveling at 89 km/hr stops within 92 m when the brakes lock and the car slides. What is the coefficient of kinetic friction between the tires and the pavem
If the wavelength of the red light in air is 689 nm and the indices of refraction of the oil and water are 1.45 and 1.33, respectively, then what is the minimum thickness of the layer of oil?
Explain why this should produce circularly-polarized light. Now rotate the top polarizer. The intensity of the light transmitted through the wave plate remains approximately constant
Two cars travel westward along a straight highway, one at a constant velocity of 77 km/h, and the other at a constant velocity of 116 km/h.
What is the period of rotation of the hour hand on a clock? The period of the reoccurrence of Monday is one week. What is Mondays frequency?
Learning tasks that emphasize you playing an active role in your learning - no sitting back and relaxing in class! What will you remember 5 years from now? Active Learning - what is it?
We measure a state"s or system"s energy with respect to it and usually assume it is or set it to 0. What if the EMPTY STATE did NOT carry the lowest achievable energy?
An electric motor rotating a workshop grinding wheel at a rate of 107 rev/min is switched off. Assume the wheel has a constant negative angular acceleration of magnitude 1.70 rad/s2.
At what temperature is the speed of sound in helium (ideal gas, = 1.67, atomic mass = 4.003 u) the same as its speed in oxygen at 0C?
A spring with a force constant of 89 N/m is compressed 8.7 cm and placed between two stationary dynamics carts of mass 1.0 kg and 1.5 kg. If friction is negligible, determine the final speed of the