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A tow truck is pulling a car out of a ditch by means of a steelcable (Y = 2.0 x 1011 N/m2) that is9.32 m long and has a radius of 0.396 cm. When the car just beginsto move, the tension in the cable is 898 N. How much has the cable stretched?
A radio wave transmits 16.7 W/m2 of power per unit area. A flat surface of area A is perpendicular to the direction of propagation of the wave. Assuming the surface is a perfect absorber, calculate the radiation pressure on it. nPa
Objective questions based on kinematics.
Compute the camels eastward displacement
Electrons are accelerated from rest through a potential difference of 350V and then enter a uniform magnetic field that is perpendicular to the velocity of the electrons. what is the angular speed of this electron
A pulse travels on a string 8.0 m long and 12 g mass. If the tension in the string is 32 N, how long does it take the pulse to travel the length of the string
Two metal blocks are attached by a cable as shown in the figure below and are submerged at rest near the surface of a lake. what is the total buoyant force on the two blocks
A 5kg object is initally at rest. The object is acted on by a 9N force toward the east for 3 seconds. How far has the object moved during this 7 second interval
A guitar string with a linear density of 2.0 g/m is stretched between supports that are 60 cm apart. What is the frequency of the fifth harmonic of this string
Earth is farthest from the Sun in July and closest to Sun in January. During which Northern Hemisphere season is Earth moving fastest in its orbit.
A closed system is observed to have 17 objects in it. Initially, the total energy of the system is 4714 J. After 1.7 h have passed, how much total energy will the system contain
An electron and a anti-electron (Positron) circle eachother at a distance of 1.00x10^-19m. What is the electrostatic force between the particles? What is the potential energy of the system? Is this energy positive or negative?
A 54.00 kg pole vaulter running at 10 m/s vaults over the bar. Her speed while she is above the bar is 1.0 m/s. Avoid air resistance, in addition to any energy absorbed by the pole, and determine her altitude as she crosses the bar.
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