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a boy is laying on a sled wich is on an ice covered hillinclined at an anlge of 15 degrees if the boy and the sled have acombned mass of 54kg what is the force pulling them down the hill.
Richard is driving home to visit his parents. 140 of the trip are on the interstate highway where the speed limit is 65. How many minutes does he save
After a day of testing race cars, you decide to take your own 1478 kg car onto the test track. While moving down the track at 11.7 m/s, you suddenly accelerate to 28.8 m/s in 12.6 s. What average net force have you applied to the car during tha..
You have an open rgan pipe and a closed organ pipe. The fundamental frequency of the open pipe is 300hz. The closed piped third harmonic is the same frequency as the open pipe second harmonic. What is the length of each pipe.
Two sinusoidal waves, each of wavelength 5 m and amplitude 10 cm, how many nodes appear in the resulting standing wave
The mass of the H2 molecule is 3.3x10-24 g. If 1023 hydrogen molecules per second strike 2.0 cm2 of wall at an angle of 45° with the normal when moving a speed of 105 cm/s
On a workday the average decibel level of a busy street is 65 kb, with 121 cars passing a given point every minute. If the number of cars is reduced to 33 cars every minute on a weekend, what is the decibel level of the street.
A 53 kg skier skis directly down a frictionless slope angled at 12° to horizontal. Choose the positive direction of the x axis to be downhill along the slope.
The largest fusion bomb ever detonated (called the Tsar Bomba) was tested by the Soviet Union in 1961. If this bomb used the deuterium-deuterium fusion reaction, how many kilograms of deuterium were required
the snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57 N. Find out the acceleration of the sled and child.
A ball is thrown horizontally from the top of a building that is 13.85 m high with a speed of 17.83 m/s. Neglecting air resistance, at what angle with respect to the horizontal will the ball strike the ground
Your nephew swings a rock around his head on a massless string. If the string is 1.5 m long and is 12?degrees from the vertical, what is the period of the rock
On an old-fashioned rotating piano stool, a woman sits holding a pair of dumbbells at a distance of 0.650m from the axis of rotation of the stool. What is the initial angular momentum of the system
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