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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?
White light consisting of wavelengths ranging from 400nm to 700nm falls on a diffraction grating that has 4000 lines/cm. What are the angular ranges of the first three orders?
A 75.0-N force is required to compress the spring of a dartgun 18.0 cm to load a 125-g dart. With what speed will the dart leave the gun?
The coefficient of kinetic friction between the 49.0 kg block and incline is 0.250. Determine the change in the kinetic energy of the 49.0 kg block as it moves from A to B, a distance of 20.0 m.
A man who normally weighs 400 N on the Earth's surface climbs to the top of a very tall ladder so he is one Earth-radius above the earth's surface. How much would he weigh there?
When the spheres are given equal amount of negative charge, each charge hangs at θ = 25.0 degrees from vertical. What is the magnitude of the charge q?
A freight train has a mass of 1.20E+7 kg. If the locomotive can exert a constant pull of 8.36E+5 N, how long does it take to increase the speed of the train from rest to 80.7 km/hr?
Find the frequency of vibration on Mars for a simple pendelum that is 50 cm long. Object weighs 0.40 as much on Mars as on the Earth.
A banked circular highway curve is designed for traffic moving at 64 km/h. The radius of the curve is 199 m. Traffic is moving along the highway at 46 km/h on a rainy day. What is the minimum coeffi