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Jack and Jill are standing on a crate at rest on the frictionless, horizontal surface of a frozen pond. Jack has a mass of 74.5kg , Jill has a mass of 45.5kg , and the crate has a mass of 15.3kg . They remember that they must fetch a pail of water, so each jumps horizontally from the top of the crate. Just after each jumps, that person is moving away from the crate with a speed of 4.40m/s relative to the crate
What is the final speed of the crate if both Jack and Jill jump simultaneously and in the same direction? (Hint: Use an inertial coordinate system attached to the ground.
What is the final speed of the crate if Jack jumps first and then a few seconds later Jill jumps in the same direction?
What is the final speed of the crate if Jill jumps first and then Jack, again in the same direction?
what speed does boxcar have after 10 seconds.What is the object's displacement Dx.
Two ants race across a table 73cm. long. One travels at 4.18cm/s and the other at 3cm/s. When the first one crosses finish line, how far behind is the second one.
What is the resultant velocity of the motor boat. What distance downstream does the boat reach opposite shore.
An object is placed 60 cm to the left of a converging lens having a focal length of 35cm. Determine the position of the final image
A coil with 41 turns of wire is wrapped on a frame with a square cross-section 1.85 cm on a side. Find the magnitude of the induced current in the coil while the field is changing
A space probe is traveling in outer space with a momentum that has a magnitude of 7.80 107 kg · m/s. Determine the momentum of the probe after the retrorocket ceases to fire
A transverse traveling wave on a cord is represented by D = 0.25 sin (6.8x + 28t) where D and x are in meters and t is in seconds. Determine maximum and minimum speeds of particles of the cord
A thin, light wire is wrapped around the rim of a wheel, The wheel rotates without friction about a stationary horizontal axis that passes through the center of the wheel. what is the mass of the wheel
The activity of a radioactive source decreases by 5.2% in 28 hours. What is the half-life of this source
A container at 25°C holds 0.50 moles of helium at a pressure of 2.5 atm. What is the volume of the container
Write at least one paragraph in which you define focal length, object and image distance and magnification. Explain the difference between real and virtual images
An iron bolt of mass 79.0 g hangs from a string 32.4 cm long. The top end of the string is fixed, Find the tension in the string and Find the magnetic force on the bolt
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