# physical science

Most popular questions
1. ## physical science

An oceanic depth-sounding vessel surveys the ocean bottom with ultrasonic waves that travel 1530 m/s in seawater. How deep is the water directly below the vessel if the time delay of the echo to the ocean floor and back is 6 s? (sound speed)* (echo time) =

asked by Jarrad Michael on June 27, 2005
2. ## Physical Science

A bicycle and its rider together have a mass of 80 kg. If the bicycle's speed is 6m/s, how much force is needed to bring it to a stop in 4 seconds

asked by Jessica on February 1, 2012
3. ## Physical science

which liquid evaporates fastest between water , ethanol , nail polish remover and methylated spirits

asked by joy on March 25, 2015
4. ## Physical Science

Energy from the sun reaches Earth mostly by A. conduction. B. convection. C. radiation. D. thermal expansion. I think it's A.

asked by Danny on September 3, 2013
5. ## Physical Science

Which of the following does NOT show the law of conservation of mass? A. 24 g of Mg burn in 32 g O2 to produce 56 g of MgO. B. 24 mL of Mg burn in 32 mL O2 to produce 56 mL of MgO. C. 2 atoms of Mg react with 1 molecule of O2 to produce 2 units of MgO. D.

asked by Brandon on August 27, 2013
6. ## Physical Science

A 100-g chunk of 72 ∘C iron is dropped into a cavity in a very large block of ice at 0∘C. What is the mass of ice that melts. (The specific heat capacity of iron is 0.11 cal/g⋅∘C.).

asked by Hannah on July 4, 2016
7. ## Physical science

Which type of graph best shows data that are parts of a whole?

asked by ruby on October 29, 2015
8. ## physical science

Calculate the kinetic or potential energy in joules for each of the following situations: A. A 2.5 kg book is held 2.0 m above the ground. B. A 15 g snowball is moving through the air at 3.5 m/s. C. A 35 kg child is sitting at the top of a slide that is

asked by Aurora Simmons on November 6, 2014
9. ## Physical Science

What are the products of a double replacement reaction between potassium bromide and silver nitrate? Name the resulting compounds.

asked by Leon on March 14, 2017
10. ## Physical Science

1. To what is amplitude related? B. the maximum displacement from the rest position C. neither A nor B D. both A and B 2. Suppose two waves collide and the temporary combined wave that results is smaller than the original waves. What term best describes

asked by Lanny on June 4, 2013
11. ## physical science

Please check my answers on this physical science quiz, thanks 1. in which of the following scenarios are action and reaction forces involved? a. when a tennis racket hits a ball b. when you step from a curb c. when you row a boat d. all of the above** 2.

asked by stacy on January 13, 2018
12. ## Physical Science

QUESTION GIVEN---Thermal conductors don’t have to be hot to transfer heat. According to Ch.16, explain a situation when an ice cube would still transfer heat to another object it is in contact with. MY ANSWER---Because, the ice may be trying to transfer

asked by cookiemonster on January 27, 2016
13. ## physical science

A clam is dropped by a seagull it takes 3 seconds to hit the ground. what is the seagulls height approximate height above the ground at the time the clam was dropped?

asked by Anonymous on October 17, 2012
14. ## Physical Science

The current in a hair dryer measures 15.0 amps. The resistance of the hair dryer is 8 ohms. What is the voltage? A. 120 V B. 0.5 V C. 7 V D. 1800 V I tried this and got D but it was wrong....can I get a little help on how to do this?

asked by Eliza💕 on January 25, 2016
15. ## Physical Science

A delivery man pushes the button to ring the doorbell. Which of the following forms of energy is not involved in this process? electrical sound mechanical gravitational my answer is gravitational

asked by Steve on February 14, 2017
16. ## Physical Science

1. A wave has a wavelength of 10 mm and a frequency of 5.0 hertz. What is its speed? A. 50 mm/s B. 50 hertz/s C. 2.0 mm/s D. 0.50 mm/s 2. Which type of mechanical wave needs a source of energy to produce it? A. a transverse wave B. a longitudinal wave C. a

asked by Lanny on June 6, 2013
17. ## Physical Science

Which of these cannot increase the strength of an electromagnet? a. making the loops smaller in the coil b. placing an iron bar in the coil c. winding more loops in the coil d. increasing the current in the coil

asked by Alex on April 29, 2014
18. ## Physical Science

Sodium (Na) reacts with chlorine gas (Cl2) to form sodium chloride (NaCl) as shown in the equation 2Na+Cl2=2nacl If 4 moles of sodium react, how many moles of chlorine gas will react? I have no idea what to do.......... I need some assistance thanks

asked by Jam on December 22, 2016
19. ## physical science

a 1.0 kg sample of metal with a specific heat of 0.50KJ/kgCis heated to 100.0C and then placed in a 50.0g sample of water at 20.0C. What is the final temperature of the metal and the water? I can't figure this out. Is the answer room temperature???

asked by nate on November 7, 2007
20. ## Physical Science

The specific heat of aluminum is 0.90 J/ g*C degrees and of iron is 0.45 J/g*C. How much energy was absorbed by each 1-gram sample? The temperature of 1 gram of aluminum rises 5.6 C degrees and the temperature of 1 gram of iron rises 11.1 C degrees.

asked by Spartan on April 20, 2017
21. ## Physical Science

A current of 6.0 amps passes through a motor that has a resistance of 5.0 ohms. calculate the power. my answer is 180 watts

asked by Steve on April 20, 2017
22. ## physical science

If you push a 900N refrigerator with the same force as you lift a 40N dumbbell, the dumbbell will move faster. which of Newton’s laws is this an example of? Explain how you know please. i know it's not the 3rd law.

asked by Hi on January 30, 2017
23. ## Physical Science

A 0.6-g peanut is burned beneath 50 g of water, which increases in temperature from 22degreesC to 50 degreesc. What is the exact food value of the peanut? (Assuming a 40% efficiency)

asked by Rachel on February 27, 2008
24. ## Physical science

A hot iron ball is dropped into 200g of cooler water. The water temperature increases by 2.0 degrees C and the temperature of the ball decreases by18.6 degrees C. What is the mass of the iron ball?

asked by Savannah on October 16, 2012
25. ## Physical Science

Hi! Thanks for checking my question out! ____ 1. Methane, CH4, burns in oxygen gas to form water and carbon dioxide. What is the correct balanced chemical equation for this reaction? (1 point) a) CH4 + O --> H2O + CO2 b) CH4 + 4O --> 2H2O + CO2 c) CH4 + O2

asked by Da Fash on November 14, 2017
26. ## Physical Science

Blood is pumped from the heart at a rate of 5L/min into the aorta of radius 2.0cm. Assuming that the density of blood 1x103 kg/m3 .Determine the velocity of blood through the aorta

asked by Janaiby on May 13, 2013
27. ## Physical Science

1) Carbon dioxide is obtain from the air and changed into carbohydrates oxygen during the process of fossilization. respiration. digestion. photosynthesis. 2) Which sequence of processes must occur for an atom of carbon to go from car to tree? respiration,

asked by Amber on January 22, 2014
28. ## Physical Science

How many meters away is a cliff if an echo is heard 0.500 s after the original sound? Assume that sound traveled at 343 m/s on that day.

asked by Julie on March 6, 2010
29. ## Physical Science

1. A silver bar 0.125 meter long is subjected to a temperature change from 200C to 100C. What will be the length of the bar after the temperature? A. 0.124764 meter (MY ANSWER) B. 0.00023635 meter C. 0.00002363 meter D. 0.0000189 meter 2. When the

asked by Anonymous on September 26, 2011
30. ## Physical Science

A 1000-kg car is moving east at 80 km/h collides head on with a 1500-kg car moving west at 40 km/h, and the two cars stick together. Which way does the wreckage move and with what initial speed?

asked by Help on September 11, 2011
31. ## Physical Science

The Magnetic field lines of a bar magnet begin near the magnet's _____________. I believe this question is asking where the lines begin (ie leave) the bar magnet...which would be the north pole.

asked by Danny on September 4, 2013
32. ## Physical Science

A 68.4-g sample of potassium chloride was added to 200.0 g of water at 20 C. Is the solution saturated, unsaturated, or supersaturated?

asked by Steve on November 12, 2016
33. ## physical science

The diameter of the sun makes an angle of .53 degrees from earth. How many minutes does it take for the sun to move one solar diameter in an overhead sky? ( Remember that it takes 24 hours or 1440 minutes for the sun to move through 360 degrees). How does

asked by Jarrad Michael on June 27, 2005
34. ## physical science

Carla applied a force of 35 n to a wheelbarrow full of bricks and moved it 2.5 m.which of the following can be determined from this information ?

asked by help on December 17, 2015
35. ## PHYSICAL SCIENCE

A 1.0 kg metal head of a geology hammer strikes a solid rock with a velocity of 5.0 m/s. Assuming all the energy is retained by the hammer head, how much will its temperature increase?

asked by Sarah on November 2, 2007
36. ## physical science

A person drives a car around a circular cloverleaf with a radius of 58 m at a uniform speed of 10 m/s. ) Compare this answer with the acceleration due to gravity as a percentage

asked by cre on July 12, 2012
37. ## Physical Science

The specific heat of copper is 0.385 J/g.°C. Which equation would you use to calculate the amount of heat needed to raise the temperature of 0.75 g of copper from 7°C to 29°C? a. Q = 0.385 J/g.°C ` (29°C 7°C) b. Q = 0.75 g ` 0.385 J/g.°C ` 29°C c.

asked by Alex on May 13, 2014
38. ## Physical science

Two balls collide head-on on a table. The first ball has a mass of 0.50 kg and an initial velocity of 12.0 m/s. The second ball has a mass of 0.75 kg and an initial velocity of -16.0 m/s. After the collision, the first ball travels at a velocity of -21.6

asked by K. on December 17, 2013
39. ## Physical Science

​ A 3-kg stone is dropped from a height of 100 m.  Find its kinetic and potential energies when it is 50 m from the ground.

asked by Jessica on February 17, 2012
40. ## physical science

a wave traveling in water has a frequeny of 250 Hz and a wavelength of 6.0 m. what is the speed of the wave?

asked by Tia on April 21, 2017
41. ## physical science

On the question...a runner completes exactly 2 laps around a 400 meter track...what is the distance and what is the displacement? Would it be...800m for distance and 0m for displacement? Thanks...

asked by Brandi on August 20, 2014
42. ## Physical science

the crest of wave A has an amplitude of 5 cm. the trough of wave B has an amplitude of 2 cm. if the crest of wave A combines with the trough of wave B,what will be the amplitude of the resulting wave? will the waves form a crest or a trough when they

asked by Victoria on January 10, 2017
43. ## Physical Science

Two balloons are filled with an equal volume of air. One is put in the refrigerator for one hour, while the other is heated in a slightly warm oven. Identify which balloon is which, and explain why.

asked by Nathan on September 27, 2009
44. ## physical science

A football player picks up.the football runs with it and throws it to a teammate, during which of these actions is work being done on the football?

asked by kesha on June 30, 2011
45. ## Physical Science

A 5.0kg textbook is raised a distance of 30.0cm as a student prepares to leave for school. How much work did the student do on the book?

asked by Misty T on January 29, 2009
46. ## Physical Science

How do you write the chemical equation for neutralization of nitric acid, HNO3, with magnesium hydroxide, Mg (OH)2, first with spectator ions and then without spectator ions?

asked by Holly on February 20, 2012
47. ## Physical Science

If you know the rate of movement along a fault, the amount of offset over a period of time can be calculated. The basic relationship is Rate = distance/time Movement along the San Andreas Fault is about 3.5 cm/yr. If a fence were built across the fault in

asked by Hannah on April 6, 2017
48. ## physical science

why a purple flower appears purple when white light shines on it.

asked by sidney on October 22, 2015
49. ## Physical Science

Henry Heavyweight weighs 1200N and stands on a pair of bathroom scales so that one scale reads twice as much as the other. What are the scale reading?

asked by Penny on February 2, 2015
50. ## physical science

what is transition metal number 24 a common solid halogen family 13 bears this name

asked by liz on November 6, 2007
51. ## physical science

A horse galloped a mile in 2 min 35s. What was its average speed in km/h?

asked by cathy on July 5, 2012
52. ## Physical Science

DISTANCE-TIME for RUNNERS Time(s) 1 2 3 4 Sally's Distance(m) 2 4 6 8 Alonzo's Distance(m) 1 2 2 4 Make a distance-time graph that shows the motion of both runners. What is the average speed of each runner? Which runner stops briefly? Over what time

asked by Ashley on November 3, 2011
53. ## Physical Science

Which of the following is a single replacement? a. KOH + HCl --> KCl + H2O b. 2Na + 2H2O --> H2 + 2NaOH c. 2C2H6 + 7O2 --> 4CO2 + 6H2O d. H2O + CO2 --> H2CO3 Any help would be appreciated, thank you in advance!

asked by Alexandra on October 11, 2013
54. ## physical science

How much work in N * m is done when a 10.0-N force moves an object 2.5 m? a. 0.25 N*m b. 2.5 N*m c. 25 N*m d. 4.0 N*m please help me thank you so much!!

asked by daniella on May 11, 2018
55. ## physical science

a 30 kg girl and a 25 kg boy face each other on friction-free roller blades.the girl pushes the boy,who moves away at a speed of 1.0 m/s.the girl,s speed is _ m/s.

asked by Anonymous on May 4, 2012
56. ## Physical Science

Rank from largest to smallest atomic radius. To rank items as equivalent, overlap them. O, S, Se, Po, Te

asked by Hannah on January 24, 2017
57. ## Physical Science

A penny on its side moving at speed v slides off the horizontal surface of a table a vertical distance y from the floor. If the speed is 3.1 m/s and the coffee table is 0.30 m tall, find the distance the coin lands from the base of the table. (Use

asked by Hannah on June 21, 2016
58. ## Physical Science

How far will 490 J raise an 8 kg mass?

asked by Morgan on March 7, 2011
59. ## physical science

17. In the Mass in Motion lab, you rolled a ball down a ramp to see how far it moved a cup. What did this experiment demonstrate? (Points : 3) An object´s momentum increases with velocity. An object´s momentum decreases with velocity. An object´s mass

asked by Maddie J. on September 27, 2011
60. ## physical science

A 30.0kg child standing from rest slides down a water slide with a vertical height of 10.0m. What is the childs speed (a)halfway down he slides vertical distance and (b)three-fourths of the way down? (Neglect friction?

asked by marlau on November 6, 2012
61. ## physical science

If the force moving an object point's at least partially in the opposite direction of the object's motion, the work is considered to be what

asked by Jerrell on May 11, 2011
62. ## Physical science

When you drop a 0.36 kg apple, Earth exerts a force on it that accelerates it at 9.8 m/s^2 toward the earth's surface. According to Newton's third law, the apple must exert an equal but opposite force on Earth. If the mass of the earth 5.98x10^24 kg, what

asked by Jenna on February 17, 2008
63. ## Physical Science

Two tugboats are towing a ship. each exerts a horizontal force of 5 tons and the angle between their tow ropes is 90. what net force is exerted on the ship?

asked by Sheryl on September 3, 2011
64. ## physical science

hermal conductors don’t have to be hot to transfer heat. According to Ch.16, explain a situation when an ice cube would still transfer heat to another object it is in contact with.

asked by sidney on October 21, 2015
65. ## physical science

A girl on a bicycle drags a wagon full of newspapers at .80 m/s for 30 min. using a force of 40 N. How much work is done?

asked by landon on October 27, 2013
66. ## Physical Science

Tritium (half-life= 12.3 y) is used to verify the age of expensive brandies. If an old brandy contains only 1/16 of the tritium present in new brandy, how long ago was it produced?

asked by Angelica Mendoza on October 29, 2010
67. ## Physical science

flammability is a material’s ability to burn in the presence of? A)hydrogen B)nitrogen C)oxygen D)carbon dioxide I think the answer is A am i right?

asked by Fred on September 14, 2016
68. ## Physical Science

A 15 g bullet is fired with a velocity of 200m/s from a 6kg rifle. What is the recoil velocity of the rifle?

asked by Lana on October 7, 2015
69. ## Physical Science

I'm having trouble with the question: Critique the phrase "airspeed velocity of a swallow." What is meant by this. I know a swallow is a bird and velocity is the speed of an object and the direction of its motion. Not sure the question is asking. Thanks..

asked by Brandi on August 19, 2014
70. ## physical science

In raising a 5000-N piano with a pulley system, the movers note that, for every 2m of rope pulled down, the piano rises 0.3m. Ideally, show that the force required to lift the piano is 500-N.

asked by erin on February 28, 2012
71. ## physical science

The heating elements of an electric toaster is typically made of nichrome wire (an alloy of nickel and chromium). As current passes through the wires, the wires heat up, thus toasting the toast. Estimate the overall resistance of a heating element which is

asked by michelle on February 17, 2017
72. ## physical science

A river does 6,500 j of work on a water wheel every second. The wheel efficiency is 12%. A. How much work in joules can the axle of the wheel do? B. What is the power output of the wheel in 1 s?

asked by Aurora Simmons on November 6, 2014
73. ## Physical Science

An iron fence is left unpainted, and it reacts with the oxygen in the air, forming rust. The formation of rust is an oxidation-reduction reaction, but it is also an example of a(n) _________ reaction My answer is synthesis

asked by Steve on October 13, 2016
74. ## Physical Science

If your mass is 76kg, find your acceleration.

asked by Hannah on June 10, 2016
75. ## Physical science

Using a hammer to drive a nail, it is the reaction force that brings the motion of the hammer to a stop but the ___________ that drives the nail into the wood.

asked by Charla on December 2, 2015
76. ## physical science

A painter uses a fixed pulley to raise a 1-k can of paint a distance of 10 m,what is the ima??

asked by Liam on April 26, 2011
77. ## Physical Science

1. Which equation correctly shows beta decay? (A) 210/82 Pb -> 209/81 Tl + 0/-1 e + y (B) 210/82 Pb -> 209/83 Bi + 0/-1 e + y (C) 210/82 Pb -> 210/83 Tl + 0/-1 e + y (D) 210/82 Pb -> 210/83 Bi + y (E) 210/82 Pb -> 210/83 Bi + 0/-1 e + y 2. The half-life if

asked by CJ on November 18, 2013
78. ## physical science

alever is used to lift a heavy load. when a to-n force pushes one end of the lever down 1.2m the load rises 0.2m. show the weight of the load is 300n

asked by hattie on August 17, 2011
79. ## physical science

How much heat must be added to 1.0kg of steam at 100 degrees Celsius to convert it to steam at 110 degrees Celsius? How much heat must be added to 1.0 kg of water at 100 degrees Celsius to convert it to steam at 100 degrees Celsius?

asked by Randylin on July 5, 2011
80. ## Physical Science

why is the kinetic energy of the lumber higher on the truck during the delivery than when it drops from the carpenter's shoulder?

asked by Lindsey on October 22, 2014
81. ## Physical Science

An astronaut in a spacesuit has a mass of 100 kilograms. What is the weight of this astronaut on the surface of the Moon where the strength of gravity is approximately 1/6 that of Earth?

asked by unknown on October 15, 2013
82. ## physical science

A 6 kg bowling ball rolling at 5 m/s strikes a stationary 4 kg bowling ball. If ball #1 is moving forward at 2 m/s after the collision, what is the speed and direction of ball #2? What is the impulse of the system? If the collision last for .5 seconds, how

asked by junior on June 22, 2011
83. ## Physical Science

What do we call kinds of animals that disappear abruptly from fossil record, yet are still alive today? "Misplaced" fossils younger fossils found below older fossils are called? Question 1: http://www.angelfire.com/mi/dinosaurs/livingfossils.html question

asked by Kendal Beverly on June 25, 2005
84. ## physical science

List the two equivalent conversion factors for the molar mass of silver, Ag.

asked by Jameisha on December 4, 2008
85. ## Physical Science

I'm working on the "Introduction to radioactivity and half-life experiment". It's harder than I thought. Any references that you know of that might make this easier to understand?

asked by Tawanza on November 13, 2007
86. ## physical science

A screwdriver with a 1-cm shaft and a 4-cm handle is used to tighten a screw, what is the ima?

asked by Liam on April 26, 2011
87. ## Physical science

Help Please . Aisha drops an antacid tablet in water and times how long it takes to dissolve. Which of the following will decrease the reaction rate? A.increasing water temperature B.decreasing water temperature C.using more water

asked by Brittany on March 22, 2013
88. ## physical science

if a block of wood drooped from a tall building has attained a velocity of 78.4 m/s, how long has it been falling?

asked by bianca on January 2, 2010
89. ## Physical Science

For questions #14 – 17, write an equation for the reaction of magnesium oxide with sodium chloride to produce magnesium chloride and sodium oxide. 14. Show the formulas of the reactants. 15. Show the formulas of the products. 16. Write the balanced the

asked by Amber on September 13, 2014
90. ## Physical Science

C(s) + H2O(g) + Heat CO(g) + H2(g) 17. How would you adjust the temperature to increase the amount of product? 18. Does the removal of hydrogen gas as it is produced shift the reaction to the left or the right? My last two questions on my homework that I

asked by Alexandra on October 11, 2013
91. ## physical science

a weightlifter raises a 70 kg barbell from the floor to a height of 2.2m in 1.2s. What was his average power output during the lift?

asked by tracey on September 19, 2012
92. ## physical science

To what Celsius temperature must a gas sample initially at 20 degrees Celsius be heated if its volume is to double while the pressure remains the same?

asked by kristy on May 7, 2012
93. ## Physical Science

What is the average kinetic energy of a nitrogen molecule, N2 in the air for 100 degrees Fahrenheit?

asked by Keke on September 19, 2016
94. ## Physical Science

Explain how you can use Boyle's law to determine the new volume of a gas when it's pressure is increased from 270 kPa to 540 kPa? The original volume of gas was 1 l. Assume the temperature and number of particles are consistent. What is the new volume?

asked by Jamie on October 20, 2015
95. ## Physical Science

On a hot summer day (30 degrees Celcius), a pesky little mosquito produced its warning sound near your ear. The sound is produced by the beating of its wings at a rate of about 600 wing beats per second. What is the frequency in Hertz of the sound wave?

asked by Adele on May 6, 2012
96. ## Physical Science

A dog having a mass of 32.0 kg runs at a constant pace of 9.50 km/hr. What is the magnitude of the dog's momentum?

asked by Stephy on June 22, 2011
97. ## physical science

Green light has a frequency of about 5.3Hz~10Green light has a frequency of about 5.3Hz~ 10^{14}. Using the relationship speed of light (c)=fƒÉ find its wavelength in air.

asked by ashley on March 17, 2014
98. ## physical science

A satellite that is 4175 miles from the center of the earth, orbits with a period of 90 minutes. What is its centripetal acceleration?

asked by Jay on October 6, 2011
99. ## Physical Science

You have a sealed glass jar full of air. If you put it in the freezer, what happens to the gas pressure in the jar??

asked by Anon on October 20, 2017
100. ## Physical Science

Compute the wavelength in air of ultrasound with a frequency of 50 kHz if the speed of sound is 344 m/s.

asked by Allison on November 8, 2012