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Mechanics
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1.in which of the following units is acceleration expressed?
anewtons
bfootpounds
ckilograms
dmeters per second squared
2.a stone falls from a ledge and takes 8 seconds to hit the ground.the stone has an original velocity of 0 m/s.how tall is the ledge?
a1,254.4 meters
b313.6 meters
c78.4 meters
d39.2 meters
3.a tank with a flat bottom is filled with water at a height of 4 meters.what ia the pressure at any point at the bottom of the tank?(you can ignore atmospheric pressure when calculating yur answer)
a4.0 kpa
b9.8 kpa
c18.9 kpa
d39.2 kpa
4.the ability of a material to tranfer hest or electric current is called?
ainsulation
bporosity
cconductivity
dconvection
5.a steel block has a volume of0.08 m3 and a density of 7,840kg/m3.what is the force of gravity acting on the block(the weight)in water?
a5,362.56 N
b6,150.64N
c6,700.56 N
d7,600.18 N
6.when an automotive battery is fully charged,the sulfuric acid and water mixture will have a specific gravity of about
a0.15
b1.0.
c32.67N
d1.96 kg
7.if an object has a mass of 20 kg,what is the force of gravitl acting on it on earth?
a196 N
b2.04 kg
c32.67 N
d1.96 kg
8.if a smalldiameter open glass tube is partially immersed in a verssel containing mercury the surface of the mercury inside the tub will be
alower then the mercury in the vessel,and shaped like the outside of an ubrella
bhigher than the mercury in the vessel,and shaped like the outside of an ubrella
clower than the mercury in the vessel,and shaped like the inside of a bowl
dhigher then the mercury in the vessel,and shaped like the inside of the bowl
9.how much time should be allowed for a 605mile car trip if the car will be travelingat an average speed of 55 miles per hour?
a8.75 hours
b9 hours
c10.5 hours
d11 hours
10.a machine is supplied energy at a rate of 4,000W and does useful work at a rate of 3,760 W.what is the efficiency of the machine?
a92%
b94%
c96%
d97%
11.what is the kinetic energy of an object that has a mass oa 30 kilograms and moves with a velcity of 20 m/s
a2,940 j
b5,880 j
c6,000 j
d12,000 j
12.if a gas has a gage oressure of of 156 kpa.it's absolute pressure is approximately
a56 kpa
b100 kpa
c256 kpa
d300 kpa
13according to ptolemy's model of the movement of celestial
bodies,
athe earth rotates around the sun
bthe sun in the center of the universe
cthe earth rotates around the moon
dplants orbit in circular path around the earth
14. a car with a mass of 1,200 kilograms is moving around in a circular curve at a uniform velocity of 20 meters per second.the centripetal force on the car is 6,000 newtons.what is the radius curve?
a160 meters
b80 meters
c32 meters
d16 meters
15.what force is requierd to accelerate a body with a mass of 15 kilograms at a rate of 8 m/s2.
a1.875 kg
b23 kg
c23 N
d120 N
16.oil flows upward in the wick of a lantern because of the liquid property called
aviscosity
bcapillarity
cmeniscusity
d.density
17a car travels from boston to harford in 4 hours.the two cities are 240 kilometers apart
what was the average speed of the car during the trip?
a 4 km/hour
b36 km/hour
c 69 km/hour
d960 km/hour
18.which of the following is the term used to discribe a body's resistance to a change in motion
ainertia
bacceleration
cgravity
dmass
19.if the velocity of an abject changes from 65 m/s to 98 m/s during a time interval of 12 s,what is the acceleration of the object
a.2.75 m/s
b5.42 m/s
c.13.58 m/s
d.33 m/s
20.an object has a mass of 120 kg on the moon.what is the force of gravity acting on the object on the moon?
a12.24 N
b20 N
c196 N
d 1,176 N
21.in a practical machine,the power output is______the power input
asmaller than
blarger than
cequal to
dmultiplied by
22.if a stone with an original velocity of 0 is falling from a ledge and takes 8 seconds to hit the ground,what is the final velocity of the stone
a39.2 m/s
b42.6 m/s
c78.4 m/s
d 156.8 m/s
23.the ratio of output power to the input power,in percent is called
aconductivitiy
befficiency
cwork
dhorsepower
24.an object with a mass of 78 kilograms is lifted through a height of 6 meters.how much work is done
a47.75j
b468j
c764.4j
d.4,586.4 j
25.a car with a mass of 2,000 kilograms is moving around a circular curve at a uniform velocity of 25 meters per second.the curve has a radius os 80 meters.what is the centrietal force on the car
a625N
b 703 N
c15,625 N
d20,250 N
22.
Optional Information:
Subject: mechanics
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Expert:
Coolchics
replied 10 years ago.
If this is exam #709100, these are your answers, with a 100% coorect!
1.d
2.b
3.d
4.c
5.a
6.c
7.a
8.a
9.d
10.b
11.c
12.c
13.d
14.b
15.d
16.b
17.c
18.a
19.a
20.c
21.a
22.c
23.b
24.d
25.c
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replied 10 years ago.
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Expert:
Coolchics
replied 10 years ago.
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