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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.
Imagine two Einstein solids in thermal contact. A has 300 atoms and B has 200 atoms, and qtotal = 100, how many macrostates are there
A rock of mass 0.340 kg is spun horizontally at the end of a wire that is 1.00 m long and has a diameter of 1.00 mm. what is the Young's modulus of the wire
When red light in a vacuum is incident at the Brewster angle on a certain type of glass, the angle of refraction is 30.0°. What are the Brewster angle
You are trying to overhear a juicy conversation, but from your distance of 24.0m , it sounds like only an average whisper of 40.0dB. How close should you come
a 100-kg mass is pulled along a frictionless surface by a force f such that its acceleration is 6 ms2. a 20-kg mass
A dynamite blast at a quarry launches a rock straight upward, and 2s later it is rising at a rate of 15m/s. assume air resistance has no effect on the rock, analyse its speed (a) at launch and (b) 5s after launch.
A laser pulse has a duration of 4.00× 10?11 s and a frequency of 6.40× 1014 Hz. How many cycles of wave are in the pulse
1500 cm3 of ideal gas at STP is cooled to -20o C and put into a 1000 cm3 container. what is the final gauge pressure?
The electric potential in a certain region is given by the equation V(x,y,z) = 3?x2y3 - 2?x2y4z2, Calculate the magnitude of the electric field at the point (x1,y1,z1) = (-5.0, 2.0, 1.5) m in units of N/C
A 430 gram rock is whirled on the end of a string 45 cm long which will break under a tension of 22 N. What is the radius of the circle of motion
A solenoid 10.0 cm in diameter and 77.4 cm long is made from copper wire of diameter 0.100 cm, with very thin insulation. What power must be delivered to the solenoid
At amusement parks, there is a popular ride where the floor of a rotating cylindrical room falls away, leaving the backs of the riders "plastered" against the wall. Suppose the radius of the room is 3.08 m and the speed of the wall is 10.6 m/s whe..
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