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A set of crash tests consists of running a test car moving at a speed of 12.4 m/s (27.7 mi/hr) into a solid wall. Strapped securely in an advanced seat belt system, a 57.0 kilogram (126lbs) dummy is found to move a distance of 0.720 meter from the moment the car touches the wall to the time the car is stopped. Find the size of the average force which acts on the dummy during that time.
Using the direction of motion as the positive direction, find the average acceleration of the dummy during that time (in g's, with 1g =9.81m/s2).
In a different car, the distance the dummy moves while being stopped is reduced from 0.720 m to 0.270 m, Find the average force on the dummy as that cars tops.
the half-life of a muon at rest is 1.52 us. One can store muons for a much longer time by accelerating them to a speed very close to that of light, How fast will the muons have to be moving
if there were two kinds of electrons, you could put 4, not just 2, in a given state. what would be the atomic number of the third largest inert gas in such a world
A 5.60 kg mass is pushed against a spring ( k = 2000 N/m) such thatthe spring is compressed 12.0 cm. The mass is released,slides 1.50 m down the incline, along which μ = 0.140. Determine the kinetic energy as it reaches level ground. (angle ofthe ..
An iron bar of mass, 0.5 kg, slides down a frictionless incline 0.32 m high. What is the speed of the combined masses after collision
A d = 3.77 mm diameter wire carries an electric current of I = 11.9 A when the electric field is E = 6.60×10-2 V/m along the wire. What is the conductivity of the wire
The resistance of a bagel toaster is 18 . To prepare a bagel, the toaster is operated for one minute from a 120-V outlet. How much energy is delivered to the toaster
The air inside a bicycle tire pump has 172 joules of work done on it as 64.8 joules of heat is conducted away from it
This procedure has actually been used to "weigh" astronauts in space. A 42.5-\rm kg chair is attached to a spring and allowed to oscillate. What is the mass of the person
A spaceship of proper length298m takes0.79µs to pass an Earth observer. find the speed of this spaceship as measured by the Earth observer
question a thin-walled metal sphere has a radius of 25 cm and carries a charge of 2.0x10-7 c. find e for a point a
An underdamped oscillator, where gamma = omega/3, is initially at rest and is subjected to a driving force given by F(t)= Asin(omega*t)+Bsin(3*omega*t),
A father racing his son has 2/3 the kinetic energy of the son who has 2/3 the mass of the father. What is the origianal speed of the father
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