A boat crossing a wide river moves with a speed of 19.0 km/h relative to the water. The water in the river has a steady speed of 7.50 km/h due south relative to the earth.
a) If the boat heads due west, determine the speed of the boat relative to an observer standing on the shore.
b) What is the angle made between the velocity of the boat relative to the observer and the west direction?
c) At what angle against the steam must the boat be headed with respect to the west direction in order for it to proceed west as seen by the observer on the shore?

On mars a rock falls an unknown vertical distance from a resting position and lands in a crater. if it takes the rock 2.5 seconds to fall, how high is the cliff the rock fell from? mars' surface gravity is 3.8 m/s2. a. 9.5 m b. 11.9 m c. 15.2 m d. 23.8 m

Isobars are lines of constant or equal pressure on a weather map. they can be used to find areas of low or high pressure over a broad area, and they can tell us how intense the system may be. on weather maps, you may have noticed areas that have a large l or h over a region with lines circling around them. the l stands for low pressure and h stands for high pressure. the lines circling them are isobars. check out the pressure system and isobars over georgia and florida. what is the present weather in this area ? a) clear and sunny b) cold and cloudy c) changing weather d) lots of precipitation

Madison lives near the ocean. she’s formed a hypothesis that increased concentrations of salt in the air speeds the corrosion of certain metals. if madison plans to test this hypothesis, she will have to deal with the following variables in her experiment: dependent variable: independent variable: one possible confounding variable: