Aman in a strength competition pulls an 18-wheel truck 3.1 m with a cable that is attached to
his body. the force in the cable is 756 n and the cable is at an 8.0° angle with the horizontal.
what is the work done on the truck? (round your answer to two significant figures.)
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What are the three ways that an object can accelerate

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)

Where do magnetic lines of force enter earth?