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In hydrogen, the transition from level 2 to level 1 has a rest wavelength of 121.6 nm. Suppose you see this line at a wavelength of 120.5 nm in Star A and 121. 2 nm in Star B. Calculate each star's
The craft has velocity components of vx = 3630 m/s and vy = 4634 m/s. Find the magnitude and direction of the initial velocity. Express the direction as an angle with respect to the +x axis.
The wave is travelling to the right at 50.0 m/s. What is the amplitude if the maximum displacement is 38.0 cm and the total distance travelled by the wave is 16.0 m?
A transformer operating from 91 V (rms supplies a 8.1 V lighting system for a garden. Eight lights, each rated 34 W, are installed parallel. Find the equivalent resistance of the system.
A chair of weight 140N is sitting on the horizontal floor; the floor is not frictionless. You push on the chair with a force = 38.0 N that is directed at an angle of 38.0 below the horizontal and th
A 4.00 {rm A} current runs through a 12-gauge copper wire (diameter 2.05 {rm mm}) and through a light bulb. Copper has 8.5 times 10^{28} free electrons per cubic meter. How many electrons pass throu
A negative charge -21.00μ C is placed on the fourth corner. At the position of the negative charge, what is the magnitude of the electric field due to the three positive charges?
(a) How long does the projectile remain in the air? (b) At what horizontal distance from the firing point does it strike the ground? (c) What is the magnitude of the vertical component of its veloci
A railroad car with mass of 20000 kg moving at 3 m/s collides and joins with two railroad cars already joined together, each with same mass as the single car and initially moving in the same directi
A DIVERGING mirror is being used to look at an object. The image distance is -112.1 in and the object distance is 405 in. Determine the focal length.
A common measure for length in the publishing business is a "point", defined as 1/72 inch. What is an area of 0.50 gry2 in terms of points squared?
Jordan ran up the hill at 7.0 m/s. The horizontal component of Jordan's velocity vector was 1.8 m/s. What was the angle of the hill?
An insulated Thermos contains 150 cm3 of hot coffee at 83 °C. You put a 12.0 g ice cube at its melting point to cool the coffee. By how many degrees has your coffee cooled once the ice has melt
During a circus performance, a 73-kg human cannonball is shot out of an 18-m-long cannon. If the human cannonball spends 0.78 s in the cannon, determine the average net force exerted on him in the b
A diving board oscillates with simple harmonic motion of frequency 2.5 cycles per second What is the maximum amplitude with which the end of the board can vibrate in order that a pebble placed ther
How far, on the average, must you travel in degrees of longitude between the time-zone boundaries at which your watch must be reset by 1 h?
What are the atomic and atomic mass of the element formed when 218/84 Po emits a beta particle? What are they if the polonium emits an alpha particle?
A 21 kg mass starts from rest and slides down an inclined plane 8.0 10-1 m long in 1 s. What net force is acting on the mass along the incline
If a sample of gold, with a mass of 27.63 g. is pressed into a leaf of 1.000 micrometers thickness, what is the area of the leaf?
what is the direction of + as a positive angle relative to due south? Suppose that - had a magnitude of 1.77 km. (c) What then would be the magnitude of?
A 270 g ball and a 660 g ball are connected by a 49.0-cm-long massless, rigid rod. The structure rotates about its center of mass at 100 rpm. What is its rotational kinetic energy?
A person whose eyes are 1.64 above the floor stands 2.30 in front of a vertical plane mirror whose bottom edge is 38 above the floor,what is the horizontal distance x to the base of the wall support
Both springs are described by Hooke's law and have spring constants with k1 = 1500 N/m and k2 = 3300 N/m. After the first spring compresses a distance of 32.1 cm, the second spring acts with the fir
A weight lifter lifts a set of weights a vertical distance of 1.38 m. If a constant net force of 399 N is exerted on the weights, how much net work is done on the weights? Answer in units of J.
One cubic cm of a cumulus cloud contains 50 to 500 water drops, which have a typical radius of 10 micrometers. How many 1 -liter bottles would that water fill?