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Question 266081: In a practical machine, the power output is ___small___ the power input.
A. smaller than C. equal to
B. larger than D. multiplied by
Click here to see answer by Alan3354(69443)

Question 266084: An object with a mass of 21 kilograms is lifted through a distance of 7 meters. How much work is done?
A. 147 J C. 1,440.6 J
B. 29.4 J D. 823.2 J
Click here to see answer by Alan3354(69443)

Question 266085: 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 of 80 meters. What is the centripetal force on the car?
A. 625 N C. 15,625 N
B. 703 N D. 20,250 N
Click here to see answer by Alan3354(69443)

Question 266159: According to Ptolemy�s model of the movement of celestial bodies,
A. the earth rotates around the sun.
B. the sun is the center of the universe.
C. the earth rotates around the moon.
D. planets orbit in circular paths around the earth.
Click here to see answer by Alan3354(69443)

Question 266160: A car with a mass of 1,200 kilograms is moving around 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 of the curve?
A. 160 meters C. 32 meters
B. 80 meters D. 16 meters
Click here to see answer by Alan3354(69443)

Question 266162: Oil flows upward in the wick of a lantern because of the liquid property called
A. viscosity. C. meniscusity.
B. capillarity. D. density
Click here to see answer by Alan3354(69443)

Question 266158: If a gas has a gage pressure of 206 kPa, its absolute pressure is approximately
A. 2,060 kPa. C. 106 kPa.
B. 306 kPa. D. 20.6 kPa.
Click here to see answer by Alan3354(69443)

Question 266163: A car travels from Boston to Hartford 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 C. 60 km/hour
B. 36 km/hour D. 960 km/hour
Click here to see answer by rfer(16322)

Question 266154: A machine has an efficiency of 91%. If the energy supplied to the machine is 4,000 watts, what is the amount being used for work?
A. 4,091 watts C. 360 watts
B. 43.96 watts D. 3,640 watts
Click here to see answer by Alan3354(69443)

Question 266164: Which of the following is the term used to describe a body�s resistance to a change in motion?
A. Inertia C. Gravity
B. Acceleration D. Mass
Click here to see answer by Alan3354(69443)

Question 266153: How much time should be allowed for a 392-km car trip if the car will be traveling at 120 km/h?
A. 5.12 hours C. 2.72 hours
B. 3.27 hours D. 0.31 hours
Click here to see answer by rfer(16322)

Question 266161: What force is required to accelerate a body with a mass of 18 kilograms at a rate of 36 m/s2?
A. 2 N C. 648 N
B. 54 N D. 6,350 N
Click here to see answer by palanisamy(496)

Question 266152: If a small-diameter open glass tube is partially immersed in a vessel containing mercury, the surface of the mercury inside the tube will be
A. lower than the mercury in the vessel, and shaped like the outside of an umbrella.
B. higher than the mercury in the vessel, and shaped like the outside of an umbrella.
C. lower than the mercury in the vessel, and shaped like the inside of a bowl.
D. higher than the mercury in the vessel, and shaped like the inside of a bowl.
Click here to see answer by Alan3354(69443)

Question 266385: find the line of symmetry f(x)=-(x+4)^2+9
Click here to see answer by checkley77(12844)

Question 266384: apply quadratic formula 5x^2-3x-8=0?
Click here to see answer by checkley77(12844)

Question 266414: two trains start from the same station and run in opposite directions. one runs at a uniform rate of 30km an hour and the other runs at 35km an hour. in how many hours will they be 195km apart?
Click here to see answer by checkley77(12844)

Question 266664: if x+y=xy, then dy/dx is?
Click here to see answer by drk(1908)

Question 266674: the equation of a tangent line to the curve x^2+y^2=169 at the point (5,-12) is?
Click here to see answer by drk(1908)

Question 266675: the derivative of (4x)^3(2x)^6 is?
Click here to see answer by drk(1908)

Question 267313: whats log base 5 exponent y = log base 5 exponent 2y+1

Click here to see answer by Alan3354(69443)

Question 267380: Given y=x/(x^2+1), use the algebraic tests to determine symmetry with respect to both axes and the origin.
Click here to see answer by drk(1908)

Question 267571: One degree Celsius indicates the same temperature change as
A. one degree Fahrenheit.
B. one degree kelvin.
C. 5/9 degree Fahrenheit.
D. 9/5 kelvin.

Click here to see answer by Edwin McCravy(20054)

Question 267617: If a source of sound waves is rapidly approaching a person, the sound heard by the person appears to have
A. a frequency higher than the original frequency.
B. a period higher than the original period.
C. an amplitude lower than the original amplitude.
D. a pitch lower than the original pitch.

Click here to see answer by rfer(16322)

Question 267621: If a string vibrates at the fundamental frequency of 528 Hz and also produces an overtone with a frequency of 1,056 Hz, this overtone is the
A. first harmonic.
B. second harmonic.
C. third harmonic.
D. fourth harmonic.

Click here to see answer by rfer(16322)

Question 267636: Which one of the following groups of chemical compounds is composed entirely of organic compounds?
A. C2H4O, CH2O, CaSO4, C3H5(OH)3
B. C6H6, C2H5OH, C6H5CH3, C3H5(NO3)3
C. C2H2, CH4, CaCl2, CaCN2
D. Ch3OCH3, Ca3(PO4)2, CO2, H2CO3

Click here to see answer by Alan3354(69443)

Question 267622: A surface receiving sound is moved from its original position to a position three times farther away from the source of the sound. The intensity of the received sound thus becomes
A. three times as low.
B. nine times as low.
C. three times as high.
D. nine times as high.

Click here to see answer by Alan3354(69443)

Question 267609: In a transverse wave that travels through a medium, the molecules of the medium vibrate
A. in the direction in which the wave travels.
B. at right angles to the direction in which the wave travels.
C. at twice the velocity of the molecules in a longitudinal wave.
D. with smaller amplitudes than the molecules in a longitudinal wave.

Click here to see answer by Alan3354(69443)

Question 267581: A wave with a period of 0.008 second has a frequency of
A. 12.5 Hz.
B. 80 Hz.
C. 125 Hz.
D. 800 Hz.

Click here to see answer by ankor@dixie-net.com(22740)

Question 267958: A chemist wants to mix a 5% acid solution with a 25% acid solution to obtain 50 liters of 20% acid solution. how many liters of each solution should be used?
Click here to see answer by ptaylor(2198)

Question 267998: Which of the following is represented in the highest percentage by volume in dry air?
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Hydrogen

Click here to see answer by Alan3354(69443)

Question 268007: If water and oil are combined in a container, the resulting liquid is a(n)
A. emulsion.
B. suspension.
C. solution.
D. mixture.

Click here to see answer by richwmiller(17219)

Question 268017: In a nuclear reaction, energy is released by the combination of two elements into a new element. This process is an example of
A. natural radioactivity.
B. artificial disintegration.
C. nuclear fusion.
D. nuclear fission.

Click here to see answer by Alan3354(69443)

Question 268015: One atom of silicon can properly be combined in a compound with
A. one atom of chlorine.
B. two atoms of oxygen.
C. three atoms of hydrogen.
D. four atoms of calcium.

Click here to see answer by Alan3354(69443)

Question 268014: Examine the following unbalanced chemical equation: CO2 + C → CO. Which of the following is the correctly balanced form of this equation?
A. 2CO2 + C → CO
B. CO2 + C → 2CO
C. CO2 + C2 → CO
D. CO2 + C → C2O

Click here to see answer by Alan3354(69443)

Question 268016: Which one of the following formulas represents an aldehyde?
A. C6H10O5
B. C2H4O
C. C2H5OH
D. CH3COOH

Click here to see answer by vksarvepalli(154)

Question 268012: The names of the compounds FeS, NaCl, NaOH, and Pb(CN)2 all end in the suffix
A. -ide.
B. -ite.
C. -ic.
D. -ate.

Click here to see answer by vksarvepalli(154)

Question 268739: An apple has 24 fewer calories than a banana. If 7 bannans have the same number of calories as 10 apples, how many calories are in a bannana?
Click here to see answer by stanbon(75887)

Question 268807: 2. If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together?
A. 2 hours and 24 minutes
B. 3 hours and 12 minutes
C. 3 hours and 44 minutes
D. 4 hours and 10 minutes
E. 4 hours and 33 minutes
Please show me how to solve this problem.
Click here to see answer by palanisamy(496)

Question 269011: y= x^2 sin 1/x (x≠0)
(A) 2x sin1/x - x^2 cos1/x
(B) -2/x cos1/x
(C) 2x cos1/x
(D) 2x sin1/x - cos1/x
(E) -cos1/x
Click here to see answer by Edwin McCravy(20054)

Question 269190: given log bA=2.435 and log bB=0.343
find log b A/B?
choose fro these four answers
1. 2.092
2. 0.835
3. 2.435
4. 2.778
Click here to see answer by scott8148(6628)

Question 269202: A local hamburger shop sold a combined total of 822 hamburgers and cheeseburgers on Wednesday. There were 72 more cheeseburgers sold than hamburgers. How many hamburgers were sold on Wednesday?

Click here to see answer by suhasbhat(3)

Question 269250: Your cell phone company charges $30.25 per month plus $0.05 per text. Your bill this month was $38.75. How may times did you send a text message?
A.17
B.170
C.775
D.1380
Click here to see answer by cornball3440(16)

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