A woman starts to swim directly across a 4.6-km-wide river. Her speed with respect to the water is 1.5 m/s. The river current carries the woman downstream at a speed of 0.91 m/s. (a) How much time does it take her to cross the river? in sec
(b) How far downstream will the river carry her by the time she reaches the other side of the river?

Asmall metal bar, whose initial temperature was 10° c, is dropped into a large container of boiling water. how long will it take the bar to reach 70° c if it is known that its temperature increases 2° during the first second? (the boiling temperature for water is 100° c. round your answer to one decimal place.) sec how long will it take the bar to reach 98° c? (round your answer to one decimal place.)

What causes the formation of ocean currents?

Abeam of electrons moves at right angles to a magnetic field of 4.5 × 10-2 tesla. if the electrons have a velocity of 6.5 × 106 meters/second, what is the force acting on the electrons? the value of q = -1.6 × 10-19 coulombs.