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Need some help on basic Physics questions..... taking teh CSET (I'm a biology major) that involves a lil physics and i'm having brain farts... thanks...

#1)I know that the area under v vs. t curve represents the object's displacement between a certain duration on time..... what is the area under a vs. t cute represent?

#2)Car travels 20 km W, then 20 km S... What is magnitude of displacement?

#3)2 vectors of magnitude 20 and 50 km are added. Which is the magnitude of their resultant?

#4) Ramp at loading dock measures 6m long and 1m high. It has an efficiency of 2/3. How much effort force will be required to push a 60 N block of ice up the ramp?

(I know efficiency=AMA/IMA and AMA=load/effort.....)

#5) Block and tackle has an IMA=5 and AMA=4. If input work is 100J, how much work is lost in overcoming distance?

(I know IMA=distance of effort/distance load and AMA=load/effort)

#6) Student weighing 4540 N sits on a seesaw 0.60 m from fulcrum. How far from fulcrum on the other side should a child with a weight of 5000 N sit so seesaw is balanced?

#7) Cube of wood with denisty=.780g/cm3 is 10.0 cm on each side. WHen cube is placed in water, what buoyant force acts on wood? density of water=1.00 g/cm3

(I know Fb=density of fluid*V*g....)

#8)Mass of iron weighs 1000 N in air but only 872N when immersed in a fluid. What buoyant force does this fluid exert on the iron?

#9) If the phenomenon of atmospheric refraction did not occur, how mught the apparent time of sunrise and sunset be affected? Answer is sunrise later and sunset earlier.... Why?

#10) When placed near the N pole of a permanent magnet, the pointed end of a sweing needle will be.......attracted is the right answer. Why? I thiugh it would be repelled.

#11) A simple circuit consists of only 2 identical bulbs. The current in the circuit is 0.25 amps. The sum of the voltages across the bulbs is 24 V. The resistance of a single bulb light would be a) 96 ohms b)48 ohms c) 24 ohms d) 12 ohms

2. Relevant equations

Above ^^^

3. The attempt at a solution

Above ^^^

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# Homework Help: Velocity, IMA/AMA, circuits

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