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A car is traveling at 25 m/s when it runs off the road and hits a utility pole. The car stops instantly, but the driver continues to move forward at 25 m/s. the airbag starts from rest with a constant acceleration from a distance of 50cm away from the driver and makes contact with him in 9ms. What is the acceleration of the airbag?
What is the magnitude of the average force on Superman's chest from the stream of bullets.
A highway curve with a radius of 550 m is banked properly for a car travelling 130 km/h. If a 1660- kg Porshe 928S rounds the curve at 250 km/h, how much sideways force should the tires exert against the road if the car does not skid.
The position function x(t) of a particle moving along an x axis is x = 4.5 - 4.5t2, with x in meters and t in seconds.
A rowboat crosses a river with a velocity of 3.51 mi/h at an angle 62.5° north of west relative to water. The river is 0.8 mi wide and carries an eastward current of 1.25 mi/h. How far upstream is the boat when it reaches the opposite shore.
A 50-g block of copper at -15?C is added to 100g of water in a 71-g aluminum cup. The cup and the water have an initial temperature of 4.0?C. Find the equilibrium temperature of the cup
A 1 uF capacitor is charged when it is connected across a 9 V battery, Find the final charge and the voltage across the plates for the 1 uF and 2 uF capacitor
During Charlie's golf drive, the angular velocity of his club is zero at the top of the backswing and 20 rad/s, What is the linear velocity of the club head just before impact with the ball
A penny sits on a rotating disk that rotates once every 0.9 s. The coefficients of static and kinetic friction between the penny and disk are 0.58 and 0.48, respectively. For the penny to not slide, what is its largest distance from the center of the..
A mass (10 kg) rests on a surface (ustatic=0.6) connected by a cord to a hanging mass of 2 kg. What is the acceleration of the heavier mass
Three forces act on an object. A 2 N force acts due east and a 3 N force acts due north. what is the magnitude of the third force
A guitar string has a tension on it of 6500 N and length of 1.2 m. what is the linear mass density of the string
a spring has a spring constant of 400 N/m. the spring is compressed 15 cm and a 2 kg ball is placed on the spring in its compressed state. what is the potential energy of the spring in its compressed state
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