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A person having a mass of 59.1 kg stands before a flight of 30 stairs each of which is 25 cm high. He runs 20 stairs, turns around, walks down 10, changes his mind, and goes up the remaining 20. How much work did he do in overcoming gravity?
A spacecraft is traveling with a velocity of v0x = 5675 m/salong the +x direction. Two engines are turned on for a time of 847 s. One engine gives the spacecraft an acceleration in the +x direction of ax = 1.25 m/s2,while the other gives it an acc..
A 1500kg weather rocket accelerates upward at 10m/s2. It explodes 1.9s after liftoff and breaks into two fragments, What was the speed of the heavier fragment just after the explosion
A step-down transformer (turns ratio = 1:8) is used with an electric train to reduce the voltage from the wall receptacle to a value needed to operate the train, What is the current in the primary coil?
Draw the displacement for the father and son.
A radar device emits microwaves with a frequency of 1.86E+9 Hz. When the waves are reflected from a van moving directly away from the emitter, What is the speed of the van
The potential energy U(r) between any two atoms, when given as a function of the distance between their centers, do the atoms behavemost like a simple harmonic oscillator
A pion decays into a muon and a neeutrino. In the rest frame of the pion, the muon always has a speed of .507c. what will be the speed of the muons in the lab fram
A 200 lbs guy wants to slide down a plastic slide 24 ft long and on a 30 degree angle, after that the slide goes horizontally for 6 feet. Taking friction into consideration, how fast would he be going down the slide.
A professor's office door is 0.95 wide, 2.2 high, 4 thick; has a mass of 22 , and pivots on frictionless hinges. A "door closer" is attached to door and the top of door frame. When the door is open and at rest, the door closer exerts a torque of 5..
The force of gravity acting on the arm acts through point A. Identify the magnitudes of the tension force t in the deltoid muscle and the force s of the shoulder on the humerus (upper-arm bone) to hold the arm in the position shown.
Use conservation of energy to calculate the speed of the alpha particle at infinity. m/s (e) If the two protons are released from rest and the alpha particle remains fixed, calculate the speed of the protons at infinity. m/s
A horizontal water main with a cross-sectional area of 196 cm2 necks down to a pipe of area 40.4 cm2. Determine the flow rate through the system, taking the fluid to be ideal
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