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Neil A. Armstrong was the first person to walk on the moon. The distance between the earth and the moon is 3.85 ? 108 m. Find the time it took for his voice to reach earth via radio waves
The gauge pressure in a helium gas cylinder is initially 26atm. What fraction of the original gas remains in the cylinder
Young's modulus of nylon is 3.7 × 109 N/m2. A force of 6.0 × 105 N is applied to a 1.5-m length of nylon of cross sectional area 0.25 m squared
A ladder of length L = 2.4 m and mass m = 14 kg rests on a floor with coefficient of static friction ?s = 0.56. Assume the wall is frictionless. find the normal force the floor exerts on the ladder
A meterstick (L = 1 m) has a mass of m = 0.133 kg. Initially it hangs from two short strings: one at the 25 cm mark and one at the 75 cm mark. What is the tension in the left string right after the r
In a European country a bathroom scale displays its reading in kilograms. When a man stands on this scale, it reads 86.1 kg. find the magnitude of the force he exerts on the chin-up bar
In preparation for this problem, review Conceptual Example 7. A space traveler whose mass is 115 kg leaves earth. What are his mass in interplanetary space where there are no nearby planetary objects
A When the magnetic flux through a single loop of wire increases by 30 Webers, a current of 40.0 A is induced in the wire. over what time did the flux change
A rectangular loop of side lengths 3 cm and 5 cm, What is the speed of the loop if the induced current is 1.5 mA
A symmetric double convex lens with a focal length of 25.0cm is to be made from glass with an index of refraction of 1.53. What should be the radius of curvature for each surface
A particle (Mass=m, charge=e, and Energy=E) is incident on a potential barrier from x<-a. sing Schrodinger equation determine the eflection and transmission coefficient at x=-a interface
A coil of wire with 217 circular turns of radius 3.20cm is in a uniform magnetic field along the axis of the coil. The coil has R = 41.5?, calculate the average emf induced in the coil
a supertanker with the mass of 3.34^7 kg is moving with a constant velocity .its engines generate a forword thurst of 5.38x10^5 n. determine the magnitude of the upward buoyant force exerted on the
a 19.2 kg sled is being pulled across a horizontal surface at a constant velocity. determine the coefficient of kinetic friction
In tae-kwon-do, a hand is slammed down onto a target at a speed of 13 m/s and comes to a stop during the 7.0 ms collision. What are the magnitudes of the impulse
A 1.0 kg ball drops vertically onto a floor, hitting with a speed of 28 m/s. It rebounds with an initial speed of 12 m/s. What impulse acts on the ball during the contact
A merry-go-round is a common piece of playground equipment. A 3.0-m-diameter merry-go-round with a mass of 230kg is spinning at 17rpm, What is the merry-go-round's angular velocity, in rpm, after Joh
A 45kg figure skater is spinning on the toes of her skates at 1.2rev/s . Her arms are outstretched as far as they will go. What is her new rotation frequency, in revolutions per second
Galaxy A is moving away from us with a speed of 0.80c relative to the earth. How fast is galaxy A moving according to an observer in galaxy B
A nuclear power plant produces an average of 4.90 × 103 MW of power during a year of operation. Find the corresponding change in mass of reactor fuel
Two lenses, one converging with focal length 21.0cm and one diverging with focal length ? 10.0cm , are placed 25.0?cm apart. Find the final image distance from second lens
Two different wavelengths of monochromatic light are projected through the same double slit. First a 490 nm light is projected, calculate the unknown wavelength
33g of copper pellets are removed from a 300?C oven and immediately dropped into 100mL of water, What will the new water temperature be
If this lens is then immersed in water with a refractive index of 1.33, what will the focal lens of the lens be in this environment