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A group of students are camping in the middle of the forest on a very dark night. Their torch batteries went flat hours ago. In the middle of the night they hear a whining sound at 1500Hz from an approaching object. It gets louder........Louder .... LOUDER, and then the pitch suddenly drops to 1200Hz and starts to become gradually quieter. Assuming the speed of sound is 340ms^-1 find the speed of the unidentified noisy object.
You are designing a delivery ramp for crates containing exercise equipment. Calculate the maximum force constant of the spring that can be used in order to meet the design criteria
The moon has a mass of 7.36 1022 kg and moves about the earth in a circular orbit of radius 3.80 108 m with a period of 27.3 days. Find the moon's kinetic energy as observed on earth
Suppose that you want to find the equation for a line that passes through the two points (0,3) and (4,9). What is the slope of this line
Runner A is at first 5.4 km west of a flagpole and is running with a constant velocity of 2.6 km/h due east. Runner B is initially 3.0 km east of the flagpole and is running with the constant velocity of 8.8 km/h due west. What would be the distance ..
A u-tube manometer is used to measure the pressure of a vessel under vacuum. Assume the manometer is open to atmospheric pressure (101.325 kPa) and the density of the fluid in the manometer is 12.0 g/cm3. When the vessel is under 11.5 psi of vacuu..
An 8.70kg block slides with an initial speed of 1.84 m/s down a ramp inclined at an angle of 28.2 with the horizontal. find the distance the block slides before coming to rest
q1. a tank with a volume of 0.150 m contains 27.0 degrees celsius helium gas at a pressure of 100 atm. how many
An ideal refrigerator does 160 J of work to remove 570 J of heat from its cold compartment during each cycle. What is the refrigerator's coefficient of performance
In a microscope the length of a tube is 20cm. The focal length of the objective is 1.00cm and the focal length of the eye piece is 3.00cm. Find the magnification of the microscope
draw a motion diagram, using the particle model, showing the cars velocity vectors as seen from a helicopter hovering over the highway.
question1a hollow sphere of radius 0.15 m with rotational inertia 1 0.040 kgm2 about a line through its center of mass
If there had been no explosion, the shell would have landed a distance from the mortar. Suppose that air resistance and the mass of the shell's explosive charge are negligible. Determine the distance from the mortar at which the larger piece of th..
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