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A train 300 m long is moving on a straight track with a speed of 83.2 km/h. The engineer applies the brakes at a crossing, and later the last car passes the crossing with a speed of 17.5 km/h. assuming constant acceleration, decide how long the train blocked the crossing. Disregard the width of the crossing.
a mass of 0.30 kg is attached to a spring and is set into vibration with a period of 0.24s. what is the spring
A soccer playrer kicks a 0.5kg ball from rest to a speed of 9m/s during a 0.15s contact between his foot and the ball. What is the average force applied by the players foot during the kick
Assume a spacecraft of mass 28,000 kg is accelerated to 0.43c. How much kinetic energy would it have? If you utilized the classical formula for kinetic energy, by what percentage would you be in error?
four point charges of magnitude 2microc are at the corners of a square with sides 4m. if this configuration was
A motorist travels for 3.0h at 80.0 km/h and 4.0 h at 60.0km/h. What is her average speed for the trip
A beam of light has a frequency of 367x1015 Hz. itis projected into a metal. Calculate the work function of the metal
The power supply for a pulsed nitrogen laser has a 0.0050-mF capacitor with a maximum voltage rating of 30 kV, calculate the power of the laser pulse
A symmetric bi-covex lens has radii of curvature R and athickness of d. Find its focal length using matrix methods
A wildland fire sawyer is cutting a snag of length L = 23.5m and mass m = 880kg. He puts a Humboldt face cut on the snag which has a negligible amount of taper, what is the final angular velocity of the snag
A 330 ohm (330 ?) resistor is connected to an unknown voltage source. The Voltage- Current Sensor measures a current of 0.50 amps (0.50 A). What is the voltage of the voltage source
The positioin of a particle moving along the x-axis is given by x =( 21+22t-6t^2)m, where t is in s. What is the average velocity during the time interval t= 1.0 s to t = 3.0s
one point-like charge of -20 nc is placed 3 cm away from a very large planar sheet of charge. the surface charge
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