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A high-speed lifting mechanism supports a 845-kg object with a steel cable that is 40.0 m long and 4.00 cm2 in cross-sectional area. (a) Determine the elongation of the cable. mm (b) By what additional amount does the cable increase in length if the object is accelerated upwards at a rate of 2.6 m/s2? mm (c) What is the greatest mass that can be accelerated upward at 2.6 m/s2 if the stress in the cable is not to exceed the elastic limit of the cable, which is 2.2 108 Pa? kg
Two protons, each having a speed of 0.970c in the laboratory, are moving toward each other. Determine the momentum of each proton in the laboratory
An electron (charge=-1.6x10^-19C) is moving at 3x10^5 m/s in the positive x direction. What are the magnitude and direction the magnetic force on the electron
A silver wire has resistivity p = 1.96 x 10-8 ohm·m and a cross-sectional area of 4.40 mm2. What is the displacement current in the wire at that time
An electric car accelerates for 8.0 s by drawing energy from its 305-V battery pack. Find the minimum horsepower rating of the car
He pulls on a rope that is fastened to the platform and runs over a pulley on the ceiling. Illustrate with what force does he have to pull in order to give himself and the platform an upward acceleration of 1.0 m/s^2?
A rope and two masses are suspended from the ceiling of an elevator which is accelerating downward at 2.8 m/s^2. find the tension in the rope connecting the two masses
Two 10-cm-diameter charged disks face each other, 20 cm apart. The left disk is charged to +55 nC and the right disk is charged to -55 nC. What is the electric field both magnitude and direction, at the midpoint between the two disks
A bat can detect small objects such as an insect whose size is approximately equal to one wavelength of the sound the bat makes. what is the smallest insect a bat can detect
A 140 ? lamp, a 25 ? electric heater, and a 57 ? fan are connected in parallel across a 137 V line. What is the current of the lamp
a 66.0-kg woman in an elevator is accelerating upward at a rate of 2.8m/s^2. What is the net force acting on the woman
Moment of inertia Wheel If you lift the front wheel of a poorly maintained bicycle off the ground and then start it spinning at 0.72rev/s, what is the magnitude of the frictional torque
A 2.5-mC charge is on the 7-axis at y= 3.0m and a 6.3-mC charge is on the x-axis at x= 3.0m. What is the direction of potential at the origin
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