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Questions in physics

[Done] Which unit of measure would scientists use to measure the thickness of a rock layer created as a result of volcanic activity?

[Done] What organ absorbs excess water from undigested food prior to its release from the body as solid waste?

[Done] Condensation nuclei are particles of atmospheric dust around which ______. A. cloud droplets form B. ozone collects C. evaporation occurs D. winds form

[Done] Carol can be defined as a social drinker because she can easily limit drinking and she chiefly drinks alcohol when she is out with friends or family members. True or False?

[Done] A bookcase has a base of 1 m long and 0.5 m wide. It has a mass of 300 kg. Find the pressure it exerts on the floor in kPa.

[Done] Express [tex]f_x[/tex] and [tex]f_y[/tex] in terms of the length of the vector [tex]f[/tex] and the angle [tex]\theta[/tex] in paired form.

[Done] You are standing 100 meters away from your car when an alligator appears 20 meters away from you on the opposite side. You start to run with a speed of 5 m/s while the alligator's speed is 8 m/s towards you. Will you reach your car before the alligator reaches you? Why?

[Done] A student who weighs 500 newtons climbed the stairs from the first floor to the third floor, 15 meters above, in 20 seconds. How much work did she do?

[Done] A space probe has two engines. Each generates the same amount of force when fired, and the directions of these forces can be independently adjusted. When the engines are fired simultaneously and each applies its force in the same direction, the probe, starting from rest, takes 24.8 s to travel a certain distance. How long does it take to travel the same distance, again starting from rest, if the engines are fired simultaneously and the forces that they apply to the probe are perpendicular?

[Done] How are hot spots used to track plate motion?